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POOpencv: Fill color in a contoured image
 

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  1. POOpencv: Fill color in a contoured image
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    <p>thanks for reading this in advance.</p> <p>I'm doing a credit card OCR related project, one step of which requires filling colors to an already contoured image.</p> <p>Sample images include:</p> <p><img src="https://i.stack.imgur.com/DPBhY.png" alt=""></p> <p>My goal is to fill the white space black:</p> <p><img src="https://i.stack.imgur.com/xuIjD.png" alt=""></p> <p>Although it seems straightforward, I have failed to find a satisfying solution. </p> <p>I was trying out the <code>findContours</code> function, but I found it very confusing. After running the following function:</p> <pre><code>findContours( cvMatImage, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cv::Point(0, 0) ); </code></pre> <p>Strangely enough, not only the contour points were not correctly extracted, but also, the original input image seemed to have its own color inverted.</p> <p><strong>Any input regarding how I should complete my goal, or how to correctly use <code>findContours</code> function is greatly appreciated.</strong></p> <h2>Update:</h2> <p>Thanks a lot for your kind input. </p> <p>In fact, the image included in my question has already been binarized -- and also I have applied an "adaptive thresholding" procedure to the image.</p> <p>The original image looks like: <code>http://i.stack.imgur.com/DkIKt.png</code></p> <pre><code>CGColorSpaceRef colorSpace = CGImageGetColorSpace(self.CGImage); CGFloat cols = self.size.width; CGFloat rows = self.size.height; Mat cvMat(rows, cols, CV_8UC4); // 8 bits per component, 4 channels CGContextRef contextRef = CGBitmapContextCreate(cvMat.data, // Pointer to data cols, // Width of bitmap rows, // Height of bitmap 8, // Bits per component cvMat.step[0], // Bytes per row colorSpace, // Colorspace kCGImageAlphaNoneSkipLast | kCGBitmapByteOrderDefault); // Bitmap info flags CGContextDrawImage(contextRef, CGRectMake(0, 0, cols, rows), self.CGImage); CGContextRelease(contextRef); CGColorSpaceRelease(colorSpace); Mat cvImage_gray, cvImage_threshold; cvtColor(cvImageOrg, cvImage_gray, CV_RGB2GRAY); //Binarize adaptiveThreshold(cvImage_gray, cvImage_threshold, 255, ADAPTIVE_THRESH_MEAN_C, THRESH_BINARY, neighbor, threshRed); //Adaptive threshold </code></pre>
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    1. COhttp://stackoverflow.com/questions/1716274/fill-the-holes-in-opencv
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      1. USWilliam
    2. COThanks! I'll check this out.
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