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POBad argument (image must have CV_8UC3 type) in grabCut
 

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  1. POBad argument (image must have CV_8UC3 type) in grabCut
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    <p>I am using grabCut algorithm using the following code:</p> <pre><code>cv::Mat img=[self cvMatFromUIImage:image]; cv::Rect rectangle(10,10,300,150); cv::Mat result; // segmentation (4 possible values) cv::Mat bgModel,fgModel; // the models (internally used) // GrabCut segmentation cv::grabCut(img, // input image result, // segmentation result rectangle, // rectangle containing foreground bgModel,fgModel, // models 3, // number of iterations cv::GC_INIT_WITH_RECT); // use rectangle // Get the pixels marked as likely foreground cv::compare(result,cv::GC_PR_FGD,result,cv::CMP_EQ); // Generate output image cv::Mat foreground(img.size(),CV_8UC3, cv::Scalar(255,255,255)); result=result&amp;1; img.copyTo(foreground, result); result); image=[self UIImageFromCVMat:foreground]; ImgView.image=image; </code></pre> <p>The code to convert <code>UIImage</code> to <code>Mat image</code> looks like this </p> <pre><code>- (cv::Mat)cvMatFromUIImage:(UIImage *)imge { CGColorSpaceRef colorSpace = CGImageGetColorSpace(imge.CGImage); CGFloat cols = imge.size.width; CGFloat rows = imge.size.height; cv::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), imge.CGImage); CGContextRelease(contextRef); CGColorSpaceRelease(colorSpace); return cvMat; } </code></pre> <p>But I got the error</p> <blockquote> <p>OpenCV Error: Bad argument (image must have CV_8UC3 type) in grabCut.</p> </blockquote> <p>If I change <code>cv::Mat cvMat(rows, cols, CV_8UC4);</code> line to <code>cv::Mat cvMat(rows, cols, CV_8UC3);</code> then I get <code>&lt;Error&gt;: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component color space; kCGImageAlphaNoneSkipLast; 342 bytes/row.</code>.</p> <p>I am confused here for what to do.</p> <p>Any help please</p>
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