2018-01-26 02:27:30 -0600 | commented answer | meanStdDev seems to have a bug? Or am I using it wrong? Downgraded to 2.4.9.1+dfsg-1.5ubuntu1 and found that the bug is not present for this 2.4.9 version. Posted this as a bug |
2018-01-25 22:22:14 -0600 | commented answer | meanStdDev seems to have a bug? Or am I using it wrong? Upgraded to OpenCV 3.4.0 release from opencv.org, still I get the same bug! With the test code as listed above, I still |
2018-01-24 04:14:09 -0600 | commented answer | meanStdDev seems to have a bug? Or am I using it wrong? Thanks Berak. On my opencv version 3.3.1 , I got outputs 10000.5 500.032 -485.257 24231.6 So probably my opencv versi |
2018-01-24 04:13:43 -0600 | commented answer | meanStdDev seems to have a bug? Or am I using it wrong? Thanks Berak. On my opencv version 3.3.1 , I got outputs 10000.5 500.032 -485.257 24231.6 So probably my opencv versio |
2018-01-24 04:11:46 -0600 | marked best answer | meanStdDev seems to have a bug? Or am I using it wrong? When I use meanStdDev for an array with more than a million elements (m = 1228800x1 matrix, by reshaping a single channel 1280x960 image), I seem to get an overflow or something like that. Code snippet: If I use a 128x96 matrix as an input, I get values like meanframe(0)=3067.9 stdframe1(0)=107.072 which seem to be correct for a dark frame from a cmos camera. But if I use a 1280x960 image as input under the same conditions, I get meanframe(0)=-454.69 stdframe1(0)=14832.8 which is absolutely wrong - negative number for mean! Additional info: gives the correct answer even for large matrices. So, meanStdDev along seems to be the culprit.... More additional info: my own code for StdDev also gives correct results, |
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2018-01-21 22:42:57 -0600 | edited question | meanStdDev seems to have a bug? Or am I using it wrong? meanStdDev seems to have a bug? Or am I using it wrong? When I use meanStdDev for an array with more than a million elem |
2018-01-21 22:21:22 -0600 | commented question | meanStdDev seems to have a bug? Or am I using it wrong? Have edited my question to remove the "unsigned int" from the array, since that may be incorrect :) |
2018-01-21 22:20:07 -0600 | edited question | meanStdDev seems to have a bug? Or am I using it wrong? meanStdDev seems to have a bug? Or am I using it wrong? When I use meanStdDev for an array with more than a million elem |
2018-01-21 22:14:51 -0600 | commented question | meanStdDev seems to have a bug? Or am I using it wrong? Sorry for the confusion. My data comes from a QHY camera. (The deprecated code is from a QHY sample :) The code for gett |
2018-01-21 22:04:55 -0600 | commented question | meanStdDev seems to have a bug? Or am I using it wrong? and after that, m=cvarrToMat(img, true); |
2018-01-21 22:01:09 -0600 | commented question | meanStdDev seems to have a bug? Or am I using it wrong? cvarrToMat, from https://docs.opencv.org/2.4/modules/core/doc/operations_on_arrays.html#Mat%20cvarrToMat That part is |
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2018-01-21 20:28:18 -0600 | edited question | meanStdDev seems to have a bug? Or am I using it wrong? meanStdDev seems to have a bug? Or am I using it wrong? When I use meanStdDev for an unsigned int array with more than a |
2018-01-21 20:19:03 -0600 | asked a question | meanStdDev seems to have a bug? Or am I using it wrong? meanStdDev seems to have a bug? Or am I using it wrong? When I use meanStdDev for an unsigned int array with more than a |