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View ArticleOpencv contrib modules on VS15
Hi! I have been trying to build the opencv_contrib module for OpenCV 3.1 on Visual Studio 15. These are the steps I've done so far: 1) Downloaded the OpenCV 3.1 from...
View ArticleTemplate Matching with a mask
I'm trying to use template matching with a mask but I'm getting significantly lower scores than I expect. class Main { public static void main(String args[]){ String inputFile =...
View ArticleSobel edge detection Implementation
I am trying to implement sobel edge detection from scratch but my output can't seem to match with OpenCV's sobel function. I performed correlation on the image with the sobel operator in both x and y...
View ArticleGreen output image from second Camera
Hi All. I have setup OpenCV 3.1.0 on my BeagleBone Black Rev C. All basic operations are working well. I have attached 3 cameras using USB hub to BBB. I have a simple OpenCV program that iterates...
View ArticleHow to construct descriptors for MSER and then do the matching?
According to what I have read, MSER feature detector identifies homogeneous stable regions in an image. To each of those regions it is possible to fit ellipses to them, so that I can identify the...
View ArticleImplement angle constraint in the Sobel operator
I have a couple of doubts related to edge detection in this question. 1) The code I have written below tries to show only those edges which obey a certain constraint of magnitude and direction. The...
View ArticleHow to train Decision Trees? How to fill TrainData with Images?
Hello OpenCV Community, after you helped me a lot with my Cascade Classifier problems, i have a new question about decision trees (C++). I want to train Decision Trees to recognize Persons. I red the...
View ArticleCascade Classifier Custom Feature Evaluator
I would like to implement my own Feature Evaluator like the ones in cascadedetect.cpp and .hpp. But I'm not sure how they work. Can anybody explain it to me? It seems like the end result of an...
View ArticleCamera opencv pixelated and lower fps
I need to know a way to quickly find a resolution for the camera where you can reach a fps near 30 and visually preview the camera does not pixelated. I'm using opencv 2.4.13.1 on Android and the...
View ArticleHow to do HAAR training?
I've been trying to achieve object detection of random objects using HAAR training. To create samples i used the parameters: C:\opencv\build\x64\vc12\bin\opencv_createsamples.exe -info...
View ArticleIndex GpuMat channels without copying
Hello everybody! I am currently using OpenCV-3.1 and I was wondering whether there was a way of indexing a `cv::cuda::GpuMat` channels without calling `cv::cuda::split`. I don't need to write to these...
View Articleopencv_xx.jar not found
I successfully installed and compiled the opencv on centos using the following method but I cant find any opencv_xxx.jar files anywhere ? that's why I think when I run the DetectFaceDemo.java program...
View ArticleGrab frames from online video file
Hi! Let's assume I have link "xyz". If opened in my browser, that link leads to a video file being played back: Basically, an existing video file is being streamed. I can, of course, also jump around...
View ArticleAdjusting memory used in haar cascade training
I'd like to increase the amount of memory used in the training using opencv_traincascade, i tried to add precalcValBufSize and precalcIdxBufSize parameters but no thing seems to be changed my machine...
View ArticleCalBackProject implement
Hi everyone, I want to make my own function calbackProject in c++. Can you help to give some instructions to do? Thank you!
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