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I’m building an automated form-submission workflow and need a C# component that reliably deciphers text-based CAPTCHAs that use custom fonts. The images are not wildly distorted, but the lettering differs from standard OCR sets, so off-the-shelf libraries struggle. Here’s what I’m after: a reusable class or small DLL that accepts a bitmap/byte array of the CAPTCHA and returns the decoded string quickly enough for live form submissions. You’re free to use Tesseract, IronOCR, Emgu CV, or a lightweight CNN you train yourself—as long as the final code runs under .NET 6, compiles cleanly, and requires no paid dependencies. Please include a minimal console project that demonstrates the call pattern and shows typical accuracy on a handful of sample images I’ll supply. If you train a model, ship the trained weights alongside the code so I can retrain later if the provider tweaks the font. Target accuracy is 90 %+ on the sample set; feel free to suggest preprocessing tricks to get there. Once delivered I’ll drop the reader into my service and test against live traffic, so clarity, clean error handling, and straightforward licensing are a must.
Project ID: 40189404
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Active 2 mos ago
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11 freelancers are bidding on average ₹6,964 INR for this job

I’m excited to apply for your project and bring my expertise in .NET and backend development to help you build secure, scalable, and high-performing applications. With 8 years of professional experience, I specialize in designing, developing, and maintaining backend systems that drive business success. My Expertise Includes: ✅ .NET Development Building robust applications using ASP.NET Core MVC, Web API, and WebForms. Implementing RESTful APIs and integrating with third-party services. Developing reusable libraries and middleware for modular systems. ✅ Backend Architecture & Database SQL Server, MySQL, and PostgreSQL – query optimization, stored procedures, and indexing. Entity Framework & Dapper for efficient ORM solutions. Designing scalable database schemas and implementing caching strategies. ✅ Cloud & Integrations Deployment and integration with Azure and AWS services. Authentication/Authorization (JWT, OAuth, Identity Server). Payment gateways, email services, and external API integrations. ✅ Best Practices & Performance Clean code architecture (Onion/Clean Architecture, Repository & Unit of Work patterns). Exception handling, logging (Serilog, NLog), and monitoring. CI/CD pipelines for smooth deployment.
₹7,000 INR in 2 days
5.9
5.9

I can build a reusable .NET 6 OCR component in C# that decodes custom-font text images using open-source libraries and preprocessing techniques. The solution will include clean error handling, a console demo, retrainable model support, and clear documentation for reliable integration into your workflow.
₹7,000 INR in 7 days
3.2
3.2

As someone with 20 years of experience in web development, I've faced numerous challenges like the one you described - and consistently delivered effective solutions. Excelling in .NET, C# Programming, and C++ Programming, I'm more than equipped to build the reliable and efficient C# component you need for your automated workflow involving custom CAPTCHA reading. Not limiting myself to off-the-shelf solutions, my broad skillset allows me to implement different strategies tailored to the unique challenges of a project. I can leverage popular tools such as Tesseract, IronOCR, Emgu CV, or utilize my deep understanding of Convolutional Neural Networks (CNN) by crafting one customized for your specific CAPTCHA type. To ensure the longevity and flexibility of your component, which I understand is crucial for your workflow, I promise a clean, error-free codebase that runs under .NET 6 without any paid dependencies. And, let me assure you: accuracy is paramount to me. To validate the effectiveness of the system we'll put together on a myriad of samples, I will provide a demo console project that demonstrates the call pattern while achieving at least 90% accuracy on the sample set you provide. Your project's success is my utmost priority; therefore, I guarantee clarity, clean error handling, and straightforward licensing upon delivery. Let's collaborate on this projeto meet all your project goals
₹7,000 INR in 7 days
3.2
3.2

Hey there! I'm Sumit, and with over 14 years of experience in the industry, I've built a solid reputation for delivering high-quality custom software solutions. Your project for a C# Custom CAPTCHA Reader perfectly aligns with my expertise. My extensive experience in .NET development and proficiency in C# will enable me to provide you with a reliable solution that accurately deciphers text-based CAPTCHAs. In regards to your specifications, I'm well-versed with Tesseract, IronOCR, Emgu CV as well as training lightweight CNN. I can build you a reusable class or small DLL that efficiently processes the CAPTCHA images and returns the decoded string swiftly enough for real-time form submissions. Moreover, I completely understand your need for utmost accuracy on the sample set and can suggest powerful preprocessing tricks to achieve more than 90% accuracy. What sets me apart is my commitment to clean coding practices and a thorough approach to error handling. I assure you of clear documentation and straightforward licensing of the delivered code. Additionally, my knowledge of CI/CD pipelines and cloud services like Azure and AWS enhances my ability to ease the integration of the reader into your existing service. Let's connect soon!
₹7,000 INR in 7 days
2.6
2.6

Hi there, You’re absolutely in the RIGHT PLACE. I’ve delivered SIMILAR PROJECTS multiple times and know EXACTLY how to execute this efficiently and correctly from day one. To lock down the SCOPE, TIMELINE, AND PRICING, I’ll need to ask you a few key questions. Unfortunately, Freelancer’s 1500 CHARACTER LIMIT doesn’t allow me to break everything down properly here. Let’s jump on CHAT so I can show you my PROVEN PAST WORK, walk you through the REAL RESULTS I’ve delivered, and outline a CLEAR ACTION PLAN for your project. You’ll immediately see why my approach is DIFFERENT and EFFECTIVE. If you’re serious about getting this done RIGHT, I’m ready to move forward. Looking forward to CONNECTING and WINNING TOGETHER. Cheers, Mayank B
₹7,000 INR in 7 days
1.5
1.5

Dear Client, Good afternoon . How are you? I hope this proposal finds you well. I'M A CERTIFIED & EXPERIENCED EXPERT This is to inform you that I have KEENLY gone through your project description, CLEARLY understood all the project requirements as instructed in your project proposal and this is to let you know that I will perfectly deliver as desired. Being in possession of all stated required skills, (C# Programming, Machine Learning (ML), .NET, C Programming, Deep Learning, OCR, Computer Vision and C++ Programming), as this is my field of professional specialization having completed all certifications and developed adequate experience in the respective field, I hereby humbly request you to consider my bid for professional, quality and affordable services that meet all your requirements. I always guarantee timely delivery and unlimited revisions where necessary hence you are assured of utmost satisfaction when working with me. Please send me a message so that we can discuss more and seal the project. THANK-YOU & WELCOME.
₹12,500 INR in 1 day
0.0
0.0

Hi, I carefully reviewed your requirement for a .NET 6–compatible C# component to decode text-based CAPTCHAs using custom fonts. Since the images are lightly distorted but font-specific, this is a good fit for a hybrid OCR + preprocessing or lightweight ML approach. Background: I have a strong systems-programming background (C/C++) and experience with image processing, performance-sensitive code, and production-quality tooling. I focus on clarity, maintainability, and realistic accuracy targets rather than brittle hacks. I’m happy to review your sample CAPTCHA images first and confirm the best technical path before starting. Thanks,
₹7,000 INR in 7 days
0.0
0.0

Hello, I can build a reliable .NET 6–compatible C# CAPTCHA decoding component tailored specifically for custom-font, text-based CAPTCHAs like the ones you described. What I’ll deliver A reusable C# class / lightweight DLL Input: Bitmap or byte[] Output: decoded CAPTCHA string No paid dependencies (Open-source only) Clean, production-ready code with proper error handling Fast enough for live form submissions Technical approach CAPTCHA-specific image preprocessing (binarization, noise removal, normalization) Custom-font handling using: Trained Tesseract custom data or Lightweight CNN model (if accuracy demands it) If ML is used: Trained model weights included Easy retraining pipeline if fonts change later Demo & validation Minimal .NET 6 console project showing: Usage pattern Accuracy results on provided sample images Targeting 90%+ accuracy on your sample dataset Why me Strong experience with C#, .NET, image processing, and OCR workflows I focus on clarity, maintainability, and licensing safety Code will be easy to plug into your existing service and test on live traffic If you share the sample CAPTCHA images, I can quickly validate the approach and confirm expected accuracy before final delivery. Looking forward to working with you. Best regards, Priyanshu .NET Developer
₹7,000 INR in 7 days
0.0
0.0

Hello there, Custom text-based CAPTCHA recognition succeeds when font behavior, image consistency, and runtime constraints are handled together rather than relying on generic OCR defaults. The work here would focus on producing a reusable .NET 6–compatible component that accepts raw image input and returns fast, reliable text output suitable for live workflows. The emphasis would be on accuracy, predictable performance, and clean encapsulation so the reader can be dropped into a larger service without friction. A small console demo and clear error handling would be included to make validation and future adjustments straightforward. Happy to connect and review sample images before moving ahead. P.S. OCR components work best when tuned deliberately, not treated as black boxes. Best Regards, Nikunj
₹7,100 INR in 7 days
0.0
0.0

Hello, I’ve reviewed your requirement for a C#/.NET 6 CAPTCHA decoder and this is absolutely achievable with a reliable, reusable approach. ✅ How I’ll approach this Since the CAPTCHA uses custom fonts (not heavy distortion), the best results come from font-aware preprocessing + OCR fine-tuning, rather than raw off-the-shelf OCR. I can deliver one of the following (based on sample images you provide): Tesseract (custom traineddata) with optimized preprocessing Emgu CV + lightweight CNN (only if needed for accuracy) Hybrid approach: image normalization + character segmentation + OCR All solutions will: Run on .NET 6 Have no paid dependencies Compile cleanly Be fast enough for live form submissions ? What you’ll get A reusable C# class or small DLL Input: Bitmap / byte[] Output: decoded string Minimal console demo project Shows call pattern Displays accuracy on provided samples Preprocessing pipeline (grayscale, thresholding, noise cleanup, resizing) Trained OCR data / model weights (if training is used) Clear error handling & logging Simple, permissive licensing clarity ? Accuracy target With sample images provided, 90%+ accuracy is realistic, especially since distortion is limited and fonts are consistent. ? Future-proofing If the CAPTCHA font changes: You’ll be able to retrain using the shipped training assets No vendor lock-in or licensing surprises
₹4,000 INR in 3 days
0.0
0.0

Gonda, India
Member since May 12, 2025
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