Issue using imcrop in a script

2 views (last 30 days)
Alex Mason
Alex Mason on 27 Jul 2021
Commented: Jonas on 28 Jul 2021
I am using imcrop to perform a "live" crop. So
So this pops open a figure with the image "init_img" and allows me to draw a box around the bit I want to crop.
init_crop, crop returns the cropped image and the bounding box.
This works fine in isolation. It also works if I am stepping through. If I run the script proper, the live cropping function appears to not work at all. I get shown the image, but I am not able to draw a box around the area I want. The program then just waits around for me to select my crop, but I can't!
Fuller code:
camList = webcamlist
cam = webcam(2)
init_img = snapshot(cam);
init_img = rgb2gray(init_img);
Alex Mason
Alex Mason on 27 Jul 2021
Yes of course. However, this initial bit of code is for setting up the crop. So the user takes a sample image from the webcam and draws the crop box.
This box is then used later to do other things. e.g. I have a loop that periodically takes images from the webcam and the crop box is re-used here to select the area of interest automatically.
But at the start, I do need the user to define where the crop should be.
Jonas on 28 Jul 2021
you can try using ginput and round the output data to pixels. unfortunately i can not test your code because i do not have a webcam at the moment

Sign in to comment.

Answers (0)


Find more on Image Processing and Computer Vision in Help Center and File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!