I’m going to assume you’re using C++, but the answer should be the same if you’re using C or Python. The function minAreaRect seems to give angles ranging from -90 to 0 degrees, not including zero, so an interval of [-90, 0). The function gives -90 degrees if the rectangle it outputs isn’t rotated, i.e. … Read more
I tried the following and it worked: Change in FindCUDA.cmake the nppi library to the several splitted ones. This has to be done in 3 places. Remember this change is just to make it work with CUDA 9.0, I am not doing checks for version or anything, which should be done if you plan to … Read more
For easy and simple way using COCO dataset, follow these steps : Modify (or copy for backup) the coco.names file in darknet\data\coco.names Delete all other classes except car Modify your cfg file (e.g. yolov3.cfg), change the 3 classes on line 610, 696, 783 from 80 to 1 Change the 3 filters in cfg file on … Read more
This approach works only on points. You don’t need to create masks for this. The main idea is: Find defects on contour If I find at least two defects, find the two closest defects Remove from the contour the points between the two closest defects Restart from 1 on the new contour I get the … Read more
“The reason why the early developers at OpenCV chose BGR color format is probably that back then BGR color format was popular among camera manufacturers and software providers. E.g. in Windows, when specifying color value using COLORREF they use the BGR format 0x00bbggrr. BGR was a choice made for historical reasons and now we have … Read more
I had the same problem. It seems that SIRF and SURF are no longer available in opencv > 3.4.2.16. I chose an older opencv-python and opencv-contrib-python versions and solved this problem. Here is the history version about opencv-python, and I use the following code : pip install opencv-python==3.4.2.16 pip install opencv-contrib-python==3.4.2.16 Edit For Anaconda User … Read more
Here the steps to use OpenCV 3.0.0 with precompiled libs, for a C++ project that links OpenCV statically, in Windows (tested with Windows 8.1) and Visual Studio (tested with Visual Studio 2013) to run this program: #include <opencv2\opencv.hpp> using namespace cv; int main() { Mat3b img = imread(“path_to_image”); imshow(“img”, img); waitKey(); return 0; } Download … Read more
The typical reason for 2+ USB cameras to not work together (still they might be working fine separately) is that USB bandwidth is insufficient for them both to run simultaneously. There is a bandwidth limit, which is rather low: The maximum throughput of an isochronous pipe (which is usually used for video) is 24MB/s. More … Read more
Well I just had to solve this remap inversion problem myself and I’ll outline my solution. Given X, Y for the remap() function that does the following: B[i, j] = A(X[i, j], Y[i, j]) I computed Xinv, Yinv that can be used by the remap() function to invert the process: A[x, y] = B(Xinv[x,y],Yinv[x,y]) First … Read more
To process the colorful image in HSV color-space is a good direction. And I split the channels and find the S channel is great. Because S is Saturation(饱和度) of color. Then threshold the S with thresh of 100, you will get this. It will be easy to separate the colorful region in the threshed binary … Read more