OpenCV

问题 I am trying to implement exemplar based in-painting, as proposed by Criminsi et. al. in its original format (before moving into further optimisations). I have a few theoretical doubts which I would like to clarify. I am not sure how the patch priority and the determination of fill-order works to propagate linear structures into the user-selected target region. From what I understand, Criminsi suggests the following: Determine the fill front dΩ. Compute the patch priorities [C(p)D(p)] on

问题 I want to draw a rectangle using only a point to the center. So pretty much a rectangle around my center point. What is the easiest way of doing this?Thanks. 回答1: Considering that center=(x,y) , then: cv::rectangle( image, cvPoint(x-w/2,y-h/2), cvPoint(x+w/2,y+h/2), CV_RGB(r,g,b), 1, 8 ); CvRect stores the top-left point as reference. So: CvRect myrect=cvRect(x-w/2,y-h/2,w,h); 来源： https://stackoverflow.com/questions/17785602/opencv-draw-rectangle-from-center-x-y

问题 Aim : Detect the motion and save only the motion periods in files with names of the starting time . Now I met the issue about how to save the video to the files with video starting time. What I tested : I tested my program part by part. It seems that each part works well except the saving part. Running status : No error. But in the saving folder, there is no video. If I use a static saving path instead, the video will be saved successfully, but the video will be override by the next video. My

问题 I am trying to extract all text regions from an image using opencv python. I have successfully detected the text regions but could not extract it. I extracted the smaller sub-matrices of a text region but I cannot aggregrate them into a bigger matrix that we see as the text region in the image. import numpy as np import cv2 from imutils.object_detection import non_max_suppression import matplotlib.pyplot as plt %matplotlib inline from PIL import Image # pip install imutils image1 = cv2.imread

问题 A user in this SOF post suggests building OpenCV with a WITH_OPENMP flag to enable (some) multi-core support. I have tried building OpenCV-2.4.10 with OpenMP but I am unable to then import cv2 in Python. Note: I am able to build and use OpenCV-2.4.10 in Python. The problem is building with the WITH_OPENMP flag. I am replacing lines 49-58 in opencv-2.4.10/cmake/OpenCVFindLibsPerf.cmake , as suggested in this blog post, with the following: # --- OpenMP --- if(NOT HAVE_TBB AND NOT HAVE_CSTRIPES)

问题 A user in this SOF post suggests building OpenCV with a WITH_OPENMP flag to enable (some) multi-core support. I have tried building OpenCV-2.4.10 with OpenMP but I am unable to then import cv2 in Python. Note: I am able to build and use OpenCV-2.4.10 in Python. The problem is building with the WITH_OPENMP flag. I am replacing lines 49-58 in opencv-2.4.10/cmake/OpenCVFindLibsPerf.cmake , as suggested in this blog post, with the following: # --- OpenMP --- if(NOT HAVE_TBB AND NOT HAVE_CSTRIPES)

问题 Is there any function in OpenCV or Emgu CV desktop capture options? (addons, libs, classes) So I know we can capture camera in a very easy way, is there any option for desktop capturing that way? 回答1: I would recommend doing a screen capture outside of Emgu (ie, in non-Emgu C++/C#). The first step is to create a bitmap from the screen image. There are plenty of websites detailing methods of how to do this. I found this one helpful. Once you have a bitmap, it's easy to create new Emgu Image<,>

问题 Is there any function in OpenCV or Emgu CV desktop capture options? (addons, libs, classes) So I know we can capture camera in a very easy way, is there any option for desktop capturing that way? 回答1: I would recommend doing a screen capture outside of Emgu (ie, in non-Emgu C++/C#). The first step is to create a bitmap from the screen image. There are plenty of websites detailing methods of how to do this. I found this one helpful. Once you have a bitmap, it's easy to create new Emgu Image<,>

问题 I have a script which uses OpenCV and python and creates a video ( avi format ) from a set of png images. The resolution of these images is good. The problem is that the resolution of the resulting video is very low. How can I improve the resolution? Is the low resolution related to the images format? CODE: writer = cv2.VideoWriter( "C:\Users\.../demo3_4.avi", -1, 1, ( width, height ) ) nFrames = 24 for i in range( 1, nFrames ): img = cv2.imread( os.path.join( str( inf ), "colorraster%d.jpg"

问题 I have a script which uses OpenCV and python and creates a video ( avi format ) from a set of png images. The resolution of these images is good. The problem is that the resolution of the resulting video is very low. How can I improve the resolution? Is the low resolution related to the images format? CODE: writer = cv2.VideoWriter( "C:\Users\.../demo3_4.avi", -1, 1, ( width, height ) ) nFrames = 24 for i in range( 1, nFrames ): img = cv2.imread( os.path.join( str( inf ), "colorraster%d.jpg"