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POMatcher Assertions failed error opencv Android
 

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  1. POMatcher Assertions failed error opencv Android
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    <p>I'm writing code to find similar object from drawable in camerapreview. I am using the newest Opencv 2.4.4.</p> <p>Below are my functions and an output from logcat. What am I doing wrong that I'm getting such output?</p> <pre><code> public void detect_image (Mat mRgba) { object_desc = new Mat(); scene_desc = new Mat(); object_keys = new MatOfKeyPoint(); scene_keys = new MatOfKeyPoint(); matches = new MatOfDMatch(); good_matches = new MatOfDMatch(); Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.sto); Utils.bitmapToMat(image,object); surf = FeatureDetector.create(FeatureDetector.FAST); surf.detect( object, object_keys ); surf.detect( mRgba, scene_keys); surfEX = DescriptorExtractor.create(DescriptorExtractor.BRIEF); surfEX.compute(object, object_keys, object_desc); surfEX.compute(mRgba, scene_keys, scene_desc); dm = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE_SL2); dm.match(object_desc, scene_desc, matches); double max_dist = 0; double min_dist = 100; for( int i = 0; i &lt; object_desc.rows(); i++ ) { double dist = matches.toArray()[i].distance; if( dist &lt; min_dist ) min_dist = dist; if( dist &gt; max_dist ) max_dist = dist; } for( int i = 0; i &lt; object_desc.rows(); i++ ) { MatOfDMatch temp = new MatOfDMatch(); if( matches.toArray()[i].distance &lt; 3*min_dist ) { temp.fromArray(matches.toArray()[i]); good_matches.push_back(temp); } } } public Mat onCameraFrame(CvCameraViewFrame inputFrame) { mRgba = inputFrame.rgba(); detect_image(mRgba); return inputFrame.rgba(); } </code></pre> <p>Logcat:</p> <pre><code>03-27 01:55:31.258: E/cv::error()(564): OpenCV Error: Assertion failed (type == src2.type() &amp;&amp; src1.cols == src2.cols &amp;&amp; (type == CV_32F || type == CV_8U)) in void cv::batchDistance(cv::InputArray, cv::InputArray, cv::OutputArray, int, cv::OutputArray, int, int, cv::InputArray, int, bool), file /home/reports/ci/slave/50-SDK/opencv/modules/core/src/stat.cpp, line 1803 </code></pre>
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    1. COWhich line exactly is failing on this assertion? Are you certain that `surf.detect()` can accept a Bitmap as input? Shouldn't it be a Mat?
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    2. COsurf.detect() takes Mats and object and mRgba are Mats. The line below causes the problems: dm.match(object_desc, scene_desc, matches);
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    3. COMy mistake, I had not seen `Utils.bitmapToMat()`. Did you verify manually that `object_desc.type == scene_desc.type` and that `object_desc.cols == object_scene.cols`? There apparently is some kind of incompatibility between your `object_desc` and `scene_desc`...
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