OpenCV

问题 I am trying to make a transparent image and draw on it, and after I will addWeighted over the base image. How can I initialize fully transparent image with width and hight in openCV python? EDIT: I want to make a effect like in Photoshop, having stack of the layers, all stacked layers are initially transparent and drawing is performed on fully transparent layer. On the end I will merge all layers to get final image 回答1: If you want to draw on several "layers" and then stack the drawings

问题 I would like to display Mat objects from OpenCV directly with JavaFX. I have seen that it is possible to convert a Mat object into a BufferedImage . But as far as I know you can't display a BufferedImage with JavaFX, so another conversion would have to take place. Is there a way to directly convert it into a data structure that is displayable by JavaFX? 回答1: I have found a direct way to convert a Mat object to a JavaFX Image object. MatOfByte byteMat = new MatOfByte(); Highgui.imencode(".bmp"

问题 I would like to display Mat objects from OpenCV directly with JavaFX. I have seen that it is possible to convert a Mat object into a BufferedImage . But as far as I know you can't display a BufferedImage with JavaFX, so another conversion would have to take place. Is there a way to directly convert it into a data structure that is displayable by JavaFX? 回答1: I have found a direct way to convert a Mat object to a JavaFX Image object. MatOfByte byteMat = new MatOfByte(); Highgui.imencode(".bmp"

问题 I would like to display Mat objects from OpenCV directly with JavaFX. I have seen that it is possible to convert a Mat object into a BufferedImage . But as far as I know you can't display a BufferedImage with JavaFX, so another conversion would have to take place. Is there a way to directly convert it into a data structure that is displayable by JavaFX? 回答1: I have found a direct way to convert a Mat object to a JavaFX Image object. MatOfByte byteMat = new MatOfByte(); Highgui.imencode(".bmp"

问题 I would like to display Mat objects from OpenCV directly with JavaFX. I have seen that it is possible to convert a Mat object into a BufferedImage . But as far as I know you can't display a BufferedImage with JavaFX, so another conversion would have to take place. Is there a way to directly convert it into a data structure that is displayable by JavaFX? 回答1: I have found a direct way to convert a Mat object to a JavaFX Image object. MatOfByte byteMat = new MatOfByte(); Highgui.imencode(".bmp"

问题 I am using opencv module to read and write the image. here is the code and below is the image i am reading and second image is after saving it on disk using cv2.imwrite(). import cv2 img = cv2.imread('originalImage.jpg') cv2.imwrite('test.jpg',img) It is significantly visible that colors are dull in second image. Is there any workaround to this problem or I am missing on some sort of setting parameters..? 回答1: The difference is that the initial image (on the left in the diagram) has an

问题 I am using opencv module to read and write the image. here is the code and below is the image i am reading and second image is after saving it on disk using cv2.imwrite(). import cv2 img = cv2.imread('originalImage.jpg') cv2.imwrite('test.jpg',img) It is significantly visible that colors are dull in second image. Is there any workaround to this problem or I am missing on some sort of setting parameters..? 回答1: The difference is that the initial image (on the left in the diagram) has an

问题 I am using opencv module to read and write the image. here is the code and below is the image i am reading and second image is after saving it on disk using cv2.imwrite(). import cv2 img = cv2.imread('originalImage.jpg') cv2.imwrite('test.jpg',img) It is significantly visible that colors are dull in second image. Is there any workaround to this problem or I am missing on some sort of setting parameters..? 回答1: The difference is that the initial image (on the left in the diagram) has an

问题 I have a folder with numerous images(about 300), I am gonna save the python file which will be splitting the images into red, green and blue channels and saving them as _red, _green, _blue, preceded by the original image name itself in a different folder. For example if the image is named "image 001", then the images obtained after the split are: "image 001_red", "image 001_green", "image 001_blue". Now, is there a way I can obtain the images one after the other using the OS library?

问题 I'm giving this command cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/developments/opencv/install/opencv/* -D WITH_CUDA=ON -D CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda/ .. but always cmake gives me -- Other third-party libraries: -- Use IPP: NO -- Use TBB: NO -- Use Cuda: NO -- Use Eigen: NO -- Use Clp: NO How can it be done? Thanks. 回答1: Most probably you don't have the required CUDA version installed. The output of cmake should be warning you about it. OpenCV 2.3.1 supports only