I am working with various images and I wanted to implement a method but I have no idea where to start. So I am looking forward to some suggestions. My idea as a method is to take an image array and after selecting a region of interest and then we say the selectedROI is 10×10 region of pixels as a
Tag: opencv
How to save video as frames in list and process the list of frames simultaneously?
I want to read input from camera and append frame in a list, display the frame from list. The code takes much time to read a frame and display it, after appending into the list. Answer As Christoph pointed out, you have an actual infinite loop running in the program, removing it will fix your program.
How to draw multi-color segmented circle using OpenCV?
What is the best way to draw multi-color segmented circle using OpenCV like below? What I found, it can be: Using cv.fillPoly Many points are required for an arcs accurate drawing, the number of segments is several hundred; Using cv.line by rotating the line in a circle; Using cv.line by rotating whole image …
Erode x pixels from side of mask with hole in OpenCV
I have a mask which may have holes inside. I want to erode from the outside of the mask (so not the holes), horizontally in, a certain number of pixels. The trick being if I’m eroding inwards 5px and at a certain point there is a hole 3px in from the edge, I want to erode those 3px and then
Why can’t I plot image histogram’s in python-OpenCV
I have to get a image, apply Histogram equalization and plot the histogram of both images (original and modified). So I tried this code: But The plot returned is..: How can I fix it? Answer You are not creating a new figure, so the histogram is plotted on the last figure that displays the image. You may creat…
Vectorized approach to masking red and blue channels in an image
I am trying to change all the red and blue pixels in an image to black to have only green pixels (based on certain conditions). To do this right now I am using multiple for loops and the process, although it works, is extremely slow. The code I have so far – Is there any way I can vectorize this
How to improve rectangles from image using opencv?
I’ve an input image like below : ] I did some processing and got lines from my input image as below Lined Image : I want to have output with cell detected like this: Output Image I tried to found cells Bounding box using findContours and connectedComponentsWithStats method but they’re not giving m…
What causes the measured fps to be different from the expected yet possible fps?
What causes the measured fps to be different from the expected yet possible fps? My webcam has 30 fps (maximum) and the measured fps is only about 20 fps. The logic behind my code: One iteration shows one frame. The total time for one iteration is the sum of tc, td and d. The reciprocal of the sum is the
opencv align two images by keypoints with stretching
I have two images image1 (object): ]3 Original image without marked keypoints: image2 is a white picture (500×500) In image1 and in image2 I have marked keypoints. I want to align image1 on image2 by keypoints. So the goal that both keypoints overlaps with stretching, scaling and transforming image2. Thi…
Multi band blending makes seams brighter and more visible
I’m trying to stitch two pre-warped images together seamlessly using multi-band blending. I have two input images (that have already been warped) and one mask. However, when I apply MBB, the area surrounding the seams glow brighter and as a result, they become more visible which is the opposite of the o…