card scanner app in android
I am trying to develop card scanner app in android !! In this i am supposed to detect the edges of the card. So Could any one let me know whether opencv is the best choice for doing this or is there...
View ArticleHow to crop a image in opencv
Hi, i want to crop a image in OpenCV without using functions. How can I do this? A have a image with 2 objects. I want to show the original image with 2 objects and a windows with a image with 1...
View ArticleCalculate surface normals from depth image using neighboring pixels cross...
As the title says I want to calculate the surface normals of a given depth image by using the cross product of neighboring pixels. However, I do not really understand the procedure. Does anyone have...
View ArticleMotion estimation between 2 frames
Hi everyone: I want to try a Motion Estimation & Compensation between 2 frames. For that, I need to extract 2 consecutive frames, and then evaluate them. My result have to be the image of the...
View Articlehow to find the centre of multiple objects in a image
I got this image  I like to find the centre of each white area and mark it as red (also get their coordinates). I am looking into moments functions,...
View ArticleWhere is the latest opencv_corexxx.dll?
I have downloaded the latest Windows installer, but I can't find the opencv_coreXXX.dll file - it's not in the bin folder as some have suggested. Please advise
View Articledividing image horizontally into equal parts
Hi everyone: I want to divide this image into two equal horizontal parts and find the difference between the number of white pixel in the bottom part to the number of pixels in the above part . Thanks...
View ArticleOpenCV 3.0 large executable from static libraries
Building with statically linked OpenCV 2.49 previously added ~1MB to my executable size. Building the same application with OpenCV 3.0 adds 10MB to the final executable. Is there a reason for the 10x...
View ArticleHow do I support c++11 in Opencv 3 Android NDK
Hi, all I am doing the next changes to support c++11 with opencv 3 in android NDK: I change from APP_STL := gnustl_static to APP_STL := c++_static Application.mk APP_STL := c++_static APP_CPPFLAGS :=...
View ArticleCrash when using image pyramid for matchTemplate
I want to improve the speed of cv::matchTemplate by following the image pyramid approach which was tried...
View ArticleBad feature matching
Hello there people, I am currently working with OpenCV 3.1 trying to make some realtime stitching of aerial images possible. However I am just starting and do have my troubles with feature matching....
View ArticleRotation center confusion
Can someone please verify my understanding or correct my misunderstanding? If I rotate an image using any one of the many online examples (mainly Stackoverflow), I get an unexpected offset in the...
View Articlebitwise_and giving Sizes of input arguments do not match
I'm trying to use bitwise in order to exclude all the rest of an image based on a threshold but when i try it gives > OpenCV Error: Sizes of input arguments do not match (The operation is neither...
View ArticleDownload the video and photos from opencv-python tutorial?
where can I download the video and photos from opencv-python tutorial?
View ArticleHow to install opencv3.0 with contrib in Ubuntu
Before I used OpenCV3.1, and install contrib perfectly. But now I need to use a 3rd party, I can only use opencv3.0. [contrib](https://github.com/itseez/opencv_contrib) I use cmake-gui to install. And...
View ArticleStructure from Motion
Hi to everybody! Is there any future plan about incorporating **Structure from Motion** open-source code (Bundler + PMVS2 + CMVS...) into OpenCV 3.x? Since all the code is freely available, tt could a...
View Articlecombining opencv with raspberry pi camera
Hello, I want to do image processing using Rpi camera and opencv and I am beginner. I have opencv 2.3.1 on my raspberry pi and I can do [the tutorials on opencv webpage using...
View ArticleIs there any way to implement BOWTrainer class for android opencv, as android...
I am working on logo in Android but got stuck as opencv4android do not have any implementation of BOWTrainer classes any help will be appreciated Thanks in advance
View ArticleOpenCV4Android Sample App - what does this code snippet do?
What is happening from line #129 to line #133 in [this...
View Articlehistogram comparison
Hi at all! I must do an histogram comparison with a formula that computes the intersection of histograms. My histograms have 256 bins. How I realize this formula correctly? I 'm using this for object...
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