The source code below presents a small variation of the Square Detector program. It’s not perfect, but it illustrates one way to approach your problem. You can diff this code to the original and check all the changes that were made, but the main ones are: Decrease the number of threshold levels to 2. In … Read more
One way to do it is to simply execute the bounding box technique to detect the digit, as illustrated by the image below: Since your image is already processed the bounding box technique I use is a lot simpler. After that procedure, all you really need to do is set the ROI (Region of Interest) … Read more
With opencv3, this should work: Python # First create the image with alpha channel rgba = cv2.cvtColor(rgb_data, cv2.COLOR_RGB2RGBA) # Then assign the mask to the last channel of the image rgba[:, :, 3] = alpha_data C++ # First create the image with alpha channel cv::cvtColor(rgb_data, rgba , cv::COLOR_RGB2RGBA); # Split the image for access to … Read more
As global CMake settings, add these lines before add_executable, valid for gcc/clang: set(CMAKE_FIND_LIBRARY_SUFFIXES “.a”) set(BUILD_SHARED_LIBS OFF) set(CMAKE_EXE_LINKER_FLAGS “-static”) On Modern CMake (3.x+ – target_link_libraries doc), you can apply the flag to specific targets, in this way: target_link_libraries(your_target_name -static) If you’re using MSVC, you have to set the compiler and linker flags: set(CMAKE_FIND_LIBRARY_SUFFIXES “.lib”) target_compile_options(your_target_name [PUBLIC|PRIVATE] … Read more
OpenCV 2.4: src.copyTo(dst(Rect(left, top, src.cols, src.rows))); OpenCV 2.x: Mat dst_roi = dst(Rect(left, top, src.cols, src.rows)); src.copyTo(dst_roi);
By default, when building OpenCV from source, it will place it’s output in /usr/local/lib and /usr/local/bin. Although, judging from your error messages, it looks like it placed the libraries in /usr/lib and the binaries in /usr/bin, so you might also check in there. You can also use the Linux find command. So, to find all … 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
There is a pip source that makes this very easy. If you have another version of opencv-python installed use this command to remove it to avoid conflicts: pip uninstall opencv-python Then install the contrib version with this: pip install opencv-contrib-python SIFT usage: import cv2 sift = cv2.xfeatures2d.SIFT_create()
An IP camera can be accessed in opencv by providing the streaming URL of the camera in the constructor of cv2.VideoCapture. Usually, RTSP or HTTP protocol is used by the camera to stream video. An example of IP camera streaming URL is as follows: rtsp://192.168.1.64/1 It can be opened with OpenCV like this: capture = … Read more
Few things: use sendall instead of send since you’re not guaranteed everything will be sent in one go pickle is ok for data serialization but you have to make a protocol of you own for the messages you exchange between the client and the server, this way you can know in advance the amount of … Read more