Opencv java tutorial pdf jobs

I have a task that involves handling an Excel sheet with data for statistical analysis. The data in question is currently stored in PDF documents, so you would need to extract and format it into Excel. Key requirements: - Requiring your expertise in typing data from PDFs into Excel. - Familiarity with data analysis, particularly in carrying out descriptive statistical analysis. - Ideally, you have worked on similar projects or have prior experience with statistical analysis using Excel. Your primary tasks would include: - Extracting data from PDF documents - Typing the data into Excel - Organizing and formatting the data for descriptive statistical analysis Experience in data entry, Excel, and a knowledge of statistical analysis would be very beneficial for this project. ...

...efficiently transform my 2D cheerleading uniform and warm-up designs into dynamic 3D renderings. Could also use assistance with font changes. The requirements include: - Proficiency in using 3D rendering software - Experience in translating 2D designs into 3D objects - Ability to work quickly and efficiently under deadlines The current 2D designs are in JPEG format, although I can provide them in PDF if necessary. To be shortlisted for this project, please include examples of past work in your application, particularly any related to sports apparel or fashion design. Skilled freelancers with a penchant for detail and a proven track record of prompt delivery, kindly apply! I would prefer that the project be completed within about a week. I have attached pictures of current ...

I'm seeking an experienced PDF generation expert who can add dynamic page breaks and footer only on the first page to the PDF on our online platform. Ideal Skills and Experience: - Experience working with PDF generation. - Experience on how to work with dynamic page break and footer in a data-driven domain. This project requires a keen eye for detail and a deep understanding of how users interact with downloadable and printable data on an online platform. We have attached a sample pdf generated by our platform for your preview.

I'm looking to have a tool developed that can analyze biological microscopy images, specifically with features such as color segmentation, edge detection, and cell counting. The tool should also support universal data import and corrections of alignment and image rotation. Ideal candidates for this project should have: - Strong proficiency in Python and Java - Previous experience with image analysis and microscopy imaging - Experience with image manipulation features like rotation corrections and alignment - Knowledge in color segmentation and edge detection functionalities. This tool will be crucial to streamline our process of analyzing microscopy images, so your commitment to detail and quality is important.

I have a technical manual in English that I need translated to Bosnian-Croatian-Serbian-Montenegrin-Slovenian. The translation will also involve data entry, converting a PDF to DOCX. Key Requirements: - An expert in English and Bosnian-Croatian-Serbian-Montenegrin-Slovenian languages - Proven experience in technical translation and data entry - Proficient in converting PDFs to DOCX - Able to follow and implement a new formatting template provided The successful candidate will be able to preserve the technical accuracy and integrity of the content, while also ensuring that the translated manual is user-friendly and well-structured. Experience in technical translations, particularly for manuals, is highly desirable.

...used to generate a PDF report periodically, specifically on a monthly or quarterly basis. Key Points: - The system should support user data input with ease, ensuring a smooth experience for those entering the information. - The PDF report generated should resemble an Excel sheet, with a detailed summary of the data provided. - We require the PDF report to be accessible at any time, allowing us to retrieve the most recent data whenever needed. - The system needs to be designed in a way that ensures the totals in the PDF report can be used for various purposes, such as tax filings and sharing information with third parties. Ideal Skills and Experience: - Proficiency in web development with a focus on form building and data handling. - Experience in generatin...

I need a skilled professional to t...preferences, although no formal branding guide exists. Following the formatting, I require the Word document to be converted into a polished PDF suitable for use as marketing material. Key tasks include: - Advanced formatting, ensuring the document is visually appealing and professional - Adhering to my color preferences for the document - Creating a visually appealing PDF suitable for marketing purposes Ideal skills and experience for this job include: - Proficiency in advanced Word formatting, including tables and images - Ability to create a visually appealing document without a detailed branding guide - Experience in creating professional and engaging PDF documents - Knowledge of marketing materials and how to present informa...

... • The crawler should be capable of providing this information for a variable timescale, ranging from 1 to 30 days in the past. • The results should be sortable. Php or python preferably The task would best suit a freelancer with previous experience designing similar crawlers and a deep understanding of web scraping, data mining, eBay and AliExpress's data structures. Proficiency in Python, Java, or another similar language commonly used for web scraping is crucial. Previous work or experience with eBay and AliExpress APIs would be a significant advantage. This crucial tool will help us analyze market trends and make more informed decisions, providing us with a competitive edge in the ever-changing online marketplace. Hone your understanding of e-commerce and...

I need a freelancer with excellent typing skills and a keen eye for detail to help me convert a scanned PDF document into a text format. This task involves the following: - The PDF documents contain simple plain text. No technical terms or foreign languages involved, therefore, no interpretation or complex language skills are needed. - The converted text should follow a basic format in the sheet. No specific formatting style is needed, keeping things as clear and simple as possible will be appreciated. - Ideally, you have experience with PDF conversion, typewriting and excellent command of English to ensure accuracy during the conversion. This project will require diligence and precision. If all goes well, there's the potential for more similar work in the futur...

We are looking for a talented and experi...design, and ship new features - Work closely with project managers to prioritize tasks and meet deadlines - Troubleshoot and debug issues to ensure smooth app performance - Stay up-to-date with new technology trends and best practices *Requirements:* - Proven experience as an Android developer, with a strong portfolio of projects - Experience leading a team of developers is a plus - Proficient in Java and Kotlin, with a good understanding of Android SDK - Familiarity with RESTful APIs to connect Android applications to back-end services - Strong problem-solving skills and attention to detail - Excellent communication and leadership abilities - Ability to work independently and as part of a team - Available to work part-time for approximate...

...seeking an experienced web developer to convert my existing PDF design into a fully functional, responsive website. This project is for personal use and demands knowledge and expertise in HTML5, CSS3 and Bootstrap5. Key Points: - I require the site to be fully responsive on all devices, ensuring a flawless user experience. - The PDF only provides a design for the homepage. Creative insight will be appreciated for the remaining pages, although they largely echo the homepage design. - Matching the aesthetics of the provided design exactly is key. Ideal Qualities: - Proven experience in HTML5, CSS3, and Bootstrap5. - Strong portfolio of previous responsive web designs. - Ability to interpret and replicate design elements from a PDF. - Creative insight for designi...

We have an excel with macro script which converts a PDF (FFE 1a, 2a, 3a) to EXCEL (FFE) that allows us to be able to read all information we need. Unfortunately it is not working due to some changes in PDF (FFE 1b, 2b, 3b) as an extra page in the front has been added, so we are looking to hire someone that can fix this issue, so that excel can ignore this extra page.

I'm in need of a freelancer for a granola product bag redesign that's has new artwork covering more of the bag and on a template can be converted into a rewind film bag .pdf template for the Printers. Key Details: - I'm looking to refresh the existing minimalistic design to a more modern and sleek style. - The target audience for this product is health-conscious adults, And Cafes using it for Acai Bowl and Granola Bowls. Final Bag size 125 mm wide x 370mm height with a 50mm Gusset As you will see from the bag image below even though it folds the top into a gussett design the bag comes out somwhat rounded at the bottom and has no clearly designed corners for the bag sides. The Product,:- "Roasted Almond Crunch" is Australia's Best selling Acai Bowl...

take PDF and draw the components and the nuts, design a bracket to fit on the unit, analyse for 1 tonne x2 for both a horizontal and a vertical lift. do a drawing set and include the component drawing as the last page in the set. drawings cover, spec sheet, GA, LIFT process, component details for manufacture , 2 x pdf of the component and the lift nuts.

I'm seeking a talented individual who is well-versed in the 12-Factor App principles, particularly in the Java programming language. I require assistance in successfully implementing all aspects of these principles in my application. Key responsibilities: - Codebase and dependencies management: I'm currently experiencing challenges in managing my large codebase, conflicts and compatibility issues between dependencies, as well as a lack of visibility and control over them. The selected freelancer is expected to help identify and resolve these issues to ensure a seamless codebase and dependency management. - Configuration, backing services, and build, release, run: I'm looking for an expert who can help me set up and manage my configuration and backing services effecti...

I'm in need of a tool that can convert PDF voter lists into Excel in a text format. Here's a breakdown of what I'm looking for: - Conversion Style: I'd like the tool to convert the PDF voter list by combining all columns into a single table. This will make it easier for me to work with the data in Excel. - Error Detection: It's important to me that the tool can automatically detect and correct errors in the text. Nevertheless, I also want to have the ability to manually review and correct the text to ensure its accuracy. - Language: In this case, the tool only needs to handle English language texts. You don't need to worry about incorporating multi-language support. Ideal Skills and Experience: - Proficiency in PDF extraction and conve...

We're in need of an advanced Python programmer well-versed in creating PDF reports from MYSQL and InfluxDB, capable of not only capturing numerical data but transforming it into Graphical Trends and Text-Based Analysis. Key Role: * Develop logics for data interpretation and representation * Create a Professional and Formal UI/UX design for the report generator * Deliver finalized, error-free reports Ideal Experience: * Python expertise * In-depth knowledge of MYSQL and InfluxDB * Proven experience in creating dynamic PDF reports * A keen eye for formal and professional UI/UX design * Strong abilities in abstract reasoning and complex logic writing. Your role will translate our complex database information into understandable, well-structured and professional-looking...

I have an HTML form that generates a PDF document on submission. Currently, the images in the form are not being displayed in the PDF. I need a skilled professional to correct this issue by adding two JPEG images correctly to the PDF. Key Requirements: - Correctly linking and displaying two JPEG images in a PDF generated from an HTML form - The images are located on my wordpress website Future Considerations: - There is no need for a mechanism to update these images automatically. This project is a one-time correction. The ideal candidate should have: - Proficient understanding of HTML and PDF generation - Strong experience in handling and displaying image files within PDFs - Excellent problem-solving skills to identify and resolve the image display is...

I am seeking an individual with high attention to detail for a data entry job. This project will involve translating textual information from a PDF document into a specified sheet format. Key responsibilities: - Accurate and efficient typing of textual data from PDF to sheet format - Strict adherence to the provided layout guidelines Ideal skills and experience: - Experience in data entry roles, specifically in transcribing textual information from PDFs - Proficiency in using Microsoft Excel and PDF readers - Strong attention to detail and adherence to guidelines - Ability to work efficiently and meet deadlines Please, consider this job if you have keen eyes and fingers primed for precision typing.

I am seeking a tale...based options trading. This project will require strong skills in both Python and Java, as well as a deep understanding of trading algorithms and experience with real-time data streaming. The software should be capable of the following: - Real-time data streaming: The software will need to retrieve and process real-time market data for accurate decision making. - Order placement: The software will need to execute buy and sell orders based on pre-defined algorithms. - Technical indicators: The software should be able to use popular technical indicators to inform its trading decisions. Your experience in algorithmic trading software development, use of Interactive Brokers API, and expertise in Python and Java will be crucial for the successful completion...

I'm looking to hire a skilled mobile app developer to create an Android application similar to 'Finnov Partner' on the Play Store. Key features of the App should include: - User registration/log...balance tracking - Transaction history In terms of aesthetic, I'm looking for a minimalist approach to design. It is essential that the look and feel of the app is clean, easy to navigate and intuitive to use. The ideal candidate for this project should have experience in creating similar fin-tech or banking apps and should have a good understanding of user database management. Proficiency in Java or Kotlin for Android development is a must. Please inbox me with your relevant apps/projects and how you can contribute to this project. Do include a rough estimate of t...

I need assistance with extracting data from PDF files into Excel. The task involves: 1. Converting PDF to Excel: Use Adobe Pro to convert tabular data from PDFs into Excel. You can use cracked version to do this. 2. Formatting: The existing tables mostly match the required format but will need adjustments a. Remove unnecessary columns and rows and map the right column names. b. Convert hierarchical data to a flat format. There are 200 PDF files (10 of which have been already done but you can verify them as well), each averaging 4-5 pages (many files have 1-2 pages but there are some with more than 20 pages, averaging to around 4-5 pages per pdf) Here is a google doc that contains references of the pdfs and the expected excel format:

I'm seeking an intermediate-level Research Assistant, highly proficient in Python, to assist me in developing deep learning algorithms for a specific project. Key Responsibilities: * Step 1: Regenerate exact same graphs as shown in the PDF using the same dataset. * Step 2: Apply various ML + DL algorithms for future prediction and obtain better results in terms of accuracy, precision, F1-score, RMSE, ME, MAE, RMSE, MAPE, etc., than already applied models. * Step 3: Documentation of the work, along with a discussion to validate the model's usage and justify it as scientific research paper. Ideal Skills & Experience: * Proficiency in the Python programming language. * Prior experience in machine learning and deep learning algorithms. * Proficient in LaTeX for writing j...

I'm looking for a professional designer to create a visually appealing and engaging strategy report. The content will be provided, so your main focus will be on the design, layout, and visual elements of the document. Key requirements include: - Design the report in a professional, corporate style. - Utilize charts and graphs to present...overall look. Ideal skills for this project include: - Proficiency in design software to create high-quality PDFs. - Experience with creating visually appealing reports. - An understanding of how to effectively use charts, graphs, infographics, images, and icons to communicate information. Please showcase your relevant experience in your bid. The final deliverable should be a polished, easy-to-read PDF report that effectively conveys the pr...

i have many vietnamese handwriting scanned pdf doccument, i want have an python project could extract text from scanned pdf doccument (extract vietnamese handwriting text the most important and must be highest corrrect)

I'm looking to revamp my company's current logo du...talented designer who can retain the existing name and integrate it into a fresh, modern logo. Key Requirements: - Retain the current company name within the new logo - Design a new, modern font for the name - Utilize a color scheme that includes blue, orange, black, and red Will be required with 2 x colour schemes (black or dark writing), black background (white writing or lighter colour), in eps, pdf, jpg, png. also required with and without logo picture ie hook removed. Ideal Skills: - Graphic Design - Logo Design - Branding - Color Theory Experience in creating modern, eye-catching designs while maintaining the essence of an existing brand is a must. Please include a portfolio of your previous work in similar p...

...individually hand-coded onto each page individually meaning I can’t easily create new pages in the website The job is to turn the existing menu into a webflow component so it can be simply dropped onto a new page and it will work. Modify the site to remove the existing menu and replace it with the component Please no custom CSS or Javascript - this can all be achieved natively in webflow SEE ATTACHED PDF FOR MORE DETAIL AND SCREENSHOTS ***NOTE***: If you are not experienced in Webflow you may find this task takes longer than expected, as there is some complexity to this (sticky menu etc etc) and webflow does not allow you to do things in HTML and CSS, you can only use the webflow UI I am targeting $30USD for this project. If you are proficient in webflow I think this i...

Please see .pdf file for full explanation. I am seeking a skilled developer to create a sophisticated online booking form. This form will require the unique capability to calculate distances between both residential and business addresses. Key Features: - The form should consider distances with traffic considerations, hence requiring a level of accuracy beyond simple point-to-point measurements. - It should also be intelligent enough to accommodate multiple non-consecutive destination inputs. Ideal Skills: - Strong understanding of geolocation APIs for accurate distance calculation. - Prior experience in designing intelligent online booking forms. - Proficiency in UX design to ensure user-friendly interactions. - Understanding of traffic patterns will be a significant plus. Th...

...common areas - Individual apartment lighting - Car park lighting *All lighting to comply with Australian Standards. *Project must be designed using AGi32 or DiaLux software Skills and Experience: - Proficiency in lighting design - Knowledge of Australian standards - Should be able to use AGi32 or DiaLux Software Note: Scope of work is attached along with some Sample drawings. Deliverables: 1. Dwg & pdf drawings with lighting fixture layout along with lux levels noted on them. 2. Lighting legend & schedule 3. Emergency lighting along with lux levels in the basement, fire stairs, and lobbies. 4. Lighting to comply with section J of the current BCA 5. Lighting specifications 6. Any other lighting calculations report that would be relevant to the overall lighting design. 7....

I'm in need of a tech-savvy specialist to enhance my current JFrog Artifactory system mainly for artifact management. I have a test environment, I need an expert to help me implement it. Key Responsibilities: - Integration of JFrog Artifactory with our existing Java technology - Perform basic customization to better suit our specifications, making sure it is fully functional and optimized for our use Ideal Candidate Profile: - Solid understanding of JFrog Artifactory - Extensive experience in Java - Proven experience in performing successful customizations for JFrog Artifactory This role requires someone who can take charge, have a keen eye for detail, show initiative and is capable of delivering on time.

I need someone who can edit some text in a pdf file very easy work need little changes only people who can do it direct

I'm seeking a reliable and competent coder, open to any programming language, be it JavaScript, Python or Java, etc. The complexity of the task is simple, shouldn't pose a challenge for an experienced developer. - Ideal Skills: Proficiency in any high-level programming language, with a track record of successfully completed projects. - Application Requirement: Your application should showcase your past works, preferably related to the project at hand. This will allow me to gauge your skill level and suitability for this project. Looking forward to your bid.

Prep for large format print in AI and ID - Art work has been done just has to be layed out to specification and packaged in a PDF format with knife lines etc.

As discussed, bird netting calculator editable pdf & xls conversion with formulas from excel, next button and submit.

...on the cost and time required to build out this project. If you will be available to provide continued maintenance and modifications as needed. A list of required WordPress plugins (If any required) to accomplish the Job. You will be provided access to the WordPress site for site transfer or you can build directly on the site. Oxygen builder is the page builder being used. Details in attached PDF Thaks...

For my quaint restaurant, I am looking for a skilled graphic designer to create an A4 size, minimalistic style menu card. Here's what you need to know: - Size: The design should fit perfectly on an A4 size paper. - Style: I want a minimalistic style design, emphasizing legibility and aesthetically pleasing presentation. - Format: The final design should be delivered in PDF format. Ideal skills and experience for this project would include proficient use of graphic design software and a strong portfolio with a focus on minimalistic design. Past experience with menu design would be a bonus.

...digits. Other text information is not needed. Google Vision API supports offline asynchronous batch image annotation for all features. The Google Vision API supports offline asynchronous batch image annotation for all features. Google has sample setup instructions in : Java : Node.js : Python : Need simple process (like click action button and select file with image urls) to extract numeric digits TEXT_DETECTION on JPG images hosted on cloud server using API

I need my existing JPEG logo converted into high-resolution formats (SVG, PNG, PDF, AI, EPS) for printing purposes. Key Aspects: - **Conversion:** Transforming my current logo from JPEG to high-resolution formats is the primary task. - **File Extension:** The final deliverables should include the logo in SVG, PNG, PDF, AI, and EPS formats. - **Printing Purposes:** The primary use of the high-resolution logo will be for printing, so the quality should be top-notch. Skills and Experience: - Extensive experience in graphic design, particularly in logo conversion and extension. - Proficiency in using design software to ensure the high-resolution logo's quality. - A good understanding of printing requirements to ensure the logo is suitable for this purpose. Please provi...

I need as-built drawings for the hydronic floor heating system in a residential building. The project is currently in the post-construction stage and the required format for the drawings is PDF. Key Requirements: - Creating as-built drawings for hydronic floor heating system in a residential building. - Converting the drawings into a high-quality, easy-to-share PDF format. Ideal Skills and Experience: - Experience in creating as-built drawings for plumbing or heating systems in residential buildings. - Proficiency in relevant software to produce professional PDFs. - Familiarity with hydronic heating systems or willingness to learn about them. Note: You must be a licensed P. Eng in Ontario, Canada. Previous experience in similar projects will be highly regarded. Thank yo...

I'm looking for a skilled professional to create a fillable PDF form that will be integrated with Google Data. The form should be designed for easy completion and submission via email. Key Requirements: - Develop a fillable PDF form. - Integration with Google Data. - Submission via email. Additional Requirements: - Incorporate our company logo into the form design. - Ensure user-friendly layout for easy completion. Ideal Skills and Expertise: - Proficient in PDF form creation. - Experience with integrating forms with Google Data. - Ability to design the form with a professional look and feel. - Understanding of user experience and form submission methods.

I'm in need of an experienced Angular developer who is proficient in Java and TypeScript. The project primarily involves API integration and will require familiarity with cloud services, particularly AWS. Key Requirements: - Strong Angular experience (at least 80% of your work history) - Proficiency in Java (at least 20% of your work history) - Solid understanding of TypeScript and JavaScript - Previous experience with API integration - Familiarity with AWS /azure. Please be aware that I am seeking to work with individuals only - no companies. Additionally, I will require a brief interview to assess your skills and suitability for the project. Your ability to communicate effectively and work well in a remote setting is highly valued.

I have a collection of PDFs that I need to have data extracted from as well as images saved. The main purpose of this task is to ex...important data that I need to have extracted and organized. The data should be converted to text and saved in a spreadsheet. - Image saving: The images contained within the PDFs also need to be saved in a usable format. Please note that there are no specific requirements for the extracted text and images other than the data extraction and image saving. Ideal Skills and Experience: - Proficiency in PDF data extraction and image saving - Experience with converting extracted data into a spreadsheet - Familiarity with handling various types of images from PDFs If you're confident in your skills to carry out this task efficiently, I look forward to...

Project Job: Willy Datasheet: Reference Development board: Create a Custom Personalized schematic incorporating the components listed, including the Rockchip RK3588 SoC and additional peripherals, you'll need to carefully consider the connections and power requirements of each component. Here's a basic outline of how you might design such a schematic: 1. Rockchip RK3588: - Connect the RK3588 SoC to the necessary power supplies, clock signals, and peripherals according to its datasheet. 2. 4GB/8GB RAM: - Connect the RAM module(s) to the RK3588 SoC's memory interface, ensuring proper signal routing and power connections

I am building an Android application that will serve as a farming tools shop. The app will be developed using Android Studio, and Java is preferred for the coding. Key functionalities of the app will include: - Product Catalog: The app should have a smooth and user-friendly product catalog that displays all available items in a well-organized manner. - Shopping Cart: Users should be able to add products to their cart, view their cart, and complete the purchase process. - User Registration and Login: A secured system where users can create accounts, log in, and manage their profiles. Other crucial features include: - Home Page: The home page should emphasize the 'Best Offers'. It will also need sections for 'Best Sellers' and 'New Arrivals'. - Produc...

Logo Design for [new Hair Club DINAN] Project Summary: Easy to read and ligible We are looking for a talented graphi...like a hair icon that will effectively represent our brand and make a lasting impression on our target audience. Requirements: 1. Original and creative logo design that reflects the nature of our business. 2. Professional and modern look and feel. 3. Versatility to be used across different mediums (website, social media, print materials, etc.). 4. High-quality and scalable vector files (AI, EPS, PDF). Font & Color Guideline: - Font Name: Niconne & ABeeZee - Color Code: Primary Color: 102222 Secondary Color: 3A1D19 We are excited to see your ideas and look forward to working with a skilled professional who can bring our brand to life through an except...

I need assistance with formatting an MS Word document that has been converted from PDF. The document contains some unwanted frames that need to be removed and various sections of the main body text that require amendments. Specifically, you'll need to: - Remove unnecessary frames from the document - Amend specific sections of the main body text - Optionally, transfer the figures in the document into Excel Ideal skills for this project include: - Proficiency in MS Word and Excel - Experience in document formatting and editing - Attention to detail for accurate text amendments - Optional: Experience in data transfer to Excel

As a company, we are in need of an intricately designed Java full stack application for our internal use. The application should be capacious enough to handle: - User Authentication and Authorization: The system should be competent enough to securely authenticate and authorize our employees, permitting only those with valid access to work on it. - Database Integration: The application should be structured to flawlessly integrate with our databases, strategically managing our internal data. - Responsive Design: Given the multitude of devices we use within the company, the application should be responsive to all, providing a smooth user experience no matter the device. An ideal candidate would have prior experience in building full stack applications with emphasis on the aforement...

I am look...system based on participant performance. - **Multiple Access Levels**: Users should have varying levels of access, such as leader, manager, and member. - **Group Creation**: The platform should allow users to create groups of members. - **Question Types**: The site should be able to support different types of questions, including programming, MCQ, and debugging. Ideal Skills: - Proficiency in Java, C++, Python, and Laravel. - Previous experience in developing online programming platforms. - Strong understanding of automated judging systems. - Experience in creating user-friendly interfaces and discussion forums. - Ability to work with multiple access levels and group creation features. If you have the right skills and experience for this project, please feel free to ...

I'm currently experiencing functionality issues with my PDF plugin where I'm confronting this odd error: "file origin does not match viewer's". This is not just associated with a single file but multiple PDFs are demonstrating the same behavior. For this project, I need an expert who can: - Identify and rectify the source of these unexpected PDF plugin errors - Ensure a smooth and correct functionality of the PDF viewer Your expertise should include proficiency in handling PDF/plugin issues and a deep understanding of similar software issues. Should you resolve this issue, more similar work might follow.

Enhanced algorithm for SGM - Experienced person for computer vision - Experienced person for SGM - PHD degree for computer vision - Experienced person with the ability to analyze existing world-wide-best papers for SGM - Ability to implement computer vision algorithms in C/C++ - c/c++ - opencv