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POConvert 12-bit Bayer image to 8-bit RGB using OpenCV
 

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  1. POConvert 12-bit Bayer image to 8-bit RGB using OpenCV
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    <p>I am trying to use OpenCV 2.3.1 to convert a 12-bit Bayer image to an 8-bit RGB image. This seems like it should be fairly straightforward using the cvCvtColor function, but the function throws an exception when I call it with this code:</p> <pre><code>int cvType = CV_MAKETYPE(CV_16U, 1); cv::Mat bayerSource(height, width, cvType, sourceBuffer); cv::Mat rgbDest(height, width, CV_8UC3); cvCvtColor(&amp;bayerSource, &amp;rgbDest, CV_BayerBG2RGB); </code></pre> <p>I thought that I was running past the end of sourceBuffer, since the input data is 12-bit, and I had to pass in a 16-bit type because OpenCV doesn't have a 12-bit type. So I divided the width and height by 2, but cvCvtColor still threw an exception that didn't have any helpful information in it (the error message was "Unknown exception").</p> <p>There was a <a href="https://stackoverflow.com/questions/7598854/how-do-i-convert-bayer-to-rgb-using-opencv-and-vice-versa">similar question</a> posted a few months ago that was never answered, but since my question deals more specifically with 12-bit Bayer data, I thought it was sufficiently distinct to merit a new question.</p> <p>Thanks in advance.</p> <p><strong>Edit</strong>: I must be missing something, because I can't even get the cvCvtColor function to work on 8-bit data:</p> <pre><code>cv::Mat srcMat(100, 100, CV_8UC3); const cv::Scalar val(255,0,0); srcMat.setTo(val); cv::Mat destMat(100, 100, CV_8UC3); cvCvtColor(&amp;srcMat, &amp;destMat, CV_RGB2BGR); </code></pre>
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    1. COSo it turns out that I *was* missing something. My colleague pointed out that I was mixing C and C++ calls. Changing the last line to cv::cvtColor(srcMat, destMat, CV_RGB2BGR); made everything work like a charm. I'm still working on the original problem of converting 16-bit Bayer data to 8-bit RGB data, so I'll post an update if I find the answer to that.
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    2. CO`cvCvtColor` belongs to old C OpenCV API, but `cv::Mat` is a class from C++ API. Mixing them is not a good idea and you'd better use only one version of API. `cv::cvtColor(srcMat, dstMat, COLOR_RGB2BGR)` should work for you.
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      1. USAndrey Kamaev
 

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