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2014-09-24 16:17:46 -0600 | commented question | Where is cv::Directory in OpenCV 3.0.? You can see this screenshot https://dl.dropboxusercontent.com/u/80704870/kokoko.png from OpenCV 2.4.8, I use this class since 2.4.4 ver. |
2014-09-23 16:31:14 -0600 | asked a question | Where is cv::Directory in OpenCV 3.0.? Where is cv::Directory in OpenCV 3.0. library? In oldest libraries I have successfully used class cv::Directory. In OpenCV 3.0. it is not. |
2014-03-17 03:22:53 -0600 | asked a question | OpenCV program for Raspberry PI doesn't write video. I wrote C++ code for Raspberry PI (OS-Raspbian): And this doesn't work in current conditions, program doesn't write "out.mjpeg" .The outStream.isOpened() returns 0. I try to use *.avi format and CV_FOURCC('N','O','N','E'), but this still doesn't work. Same code properly works for Windows. If I use imwrite("out.jpg", frame) RaspberryPI program properly works and write out.jpg Where is problem? |
2014-03-11 04:15:47 -0600 | answered a question | saving predicted label to a text file |
2014-02-13 02:07:52 -0600 | answered a question | Measuring edge thickness using OpenCV You can try to use next algorithm: 1. Use FindContours to your image. 2. Divide contour to small segments (e.g. 5px). 3. Use equation of line and her perpendicular from analytical geometry: Ax+Bx=0 between segement and points from contour (in code you can use abs(Ax+Bx) < th (th some threshold e.g. 0.5,1.0...). I use similar algorithm for calculating wire thickness from video, see screenshot . |
2014-02-13 00:58:21 -0600 | commented answer | How to change contrast of image? This takes 40-43ms. |
2014-02-11 13:25:55 -0600 | answered a question | How to change contrast of image? I found next solution, this takes 30-33ms in my conditions(see above): |
2014-02-10 11:39:46 -0600 | commented answer | How to change contrast of image? I found solution,but I will paste code tommorow, because this opencv forum show me message:"New users must wait 2 days before answering their own question. You can post an answer tomorrow". |
2014-02-10 11:35:35 -0600 | commented answer | How to change contrast of image? This is non-effective code from opencv documentation http://docs.opencv.org/doc/tutorials/core/basic_linear_transform/basic_linear_transform.html , that I gave above. |
2014-02-09 12:17:01 -0600 | asked a question | How to change contrast of image? Hello! I have a problem . I decided to write a function to change the contrast of the image. Original image : RGB 8-bit 1920x1080. Processor of computer , which I use for processing is AMD Phenom II 810 2.6 GHz. To compile in Visual Studio (c + +) I use configuration Release x64. If the algorithm is used as here : http://docs.opencv.org/doc/tutorials/core/basic_linear_transform/basic_linear_transform.html, then the image processing takes 340ms , that's a lot . Next, I decided to write the code in the likeness http://habrahabr.ru/post/139428/ ( taking remarks in the comments ) , the processing time became 240ms , it is lot. Then I tried to use to calculate the "buf ( see article from http://habrahabr.ru/post/139428/) using a thumbnail image of the original ( somewhere in the 10 times ) , the processing time was reduced to 100 ms , but still a lot. Google doesn't give results about image contrast changing fast algorithm. |
2014-02-09 12:16:49 -0600 | asked a question | How to change contrast of image? Hello! I have a problem . I decided to write a function to change the contrast of the image. Original image : RGB 8-bit 1920x1080. Processor of computer , which I use for processing is AMD Phenom II 810 2.6 GHz. To compile in Visual Studio (c + +) I use configuration Release x64. If the algorithm is used as here : http://docs.opencv.org/doc/tutorials/core/basic_linear_transform/basic_linear_transform.html, then the image processing takes 340ms , that's a lot . Next, I decided to write the code in the likeness http://habrahabr.ru/post/139428/ ( taking remarks in the comments ) , the processing time became 240ms , it is lot. Then I tried to use to calculate the "buf ( see article from http://habrahabr.ru/post/139428/) using a thumbnail image of the original ( somewhere in the 10 times ) , the processing time was reduced to 100 ms , but still a lot. Google doesn't give results about image contrast changing fast algorithm. |
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2013-10-28 04:20:38 -0600 | asked a question | Launch Opencv program at Pi Raspberry. Hello! How to launch some opencv program at Pi Raspberry (OS: raspbian)? At Ubuntu PC I built "libraries by arm-gnueabi.toolchain" (http://docs.opencv.org/doc/tutorials/introduction/crosscompilation/arm_crosscompile_with_cmake.html) and then copied folder "lib" to RPI. Then I launched some simple opencv program and get some message: /public_f/opencv_p/p0: 1: /public_f/opencv_p/p0: Syntax error: "(" unexpected What's the problem? How to right build and launch opencv programs at Raspberry Pi without building Opencv library at RPI? Sorry for the my bad English :-[) |
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2013-08-05 04:48:08 -0600 | asked a question | How to use CvBoost? Hello. I have some matrix MxN(M - count of weak classificators, N - count of results weak classificator at each validation image(positives and negatives): Example: 1 1 1 1 0 0 0 0 1 1 1 0 0 1 0 0 1 0 1 1 1 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0 Which tflag for CvBoost should I choose for right work for CvBoost? How to correctly create responses vector? |