viewing an image like a binary image with cv2 module in python (going in loop)

Question

I try again to do better my question (http://stackoverflow.com/questions/14349550/convert-image-in-a-binary-image-with-cv2-module-in-python)

In this code (it's a little bit changed from the first ) I can easily work with my converted binary image , extracting contours, calculating areas.. but it's not again possible to execute this code line: cv2.imshow('gray_image',imgray).

it show me a total grey window and that's all. I have to quit python because goes in loop.

imgray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(imgray,127,255,0) 
contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
print('oggetti trovati')
print(len(contours))
cnt = contours[0]
print(len(cnt))
cv2.imshow('gray_image',imgray)

What can I do?

Why now it's work? I try similar work with scikit-image and matplotlib.pyplot and is not necessary! It cannot execute code showing image and execute other code? — postgres
– postgres, Commented Jan 17, 2013 at 1:24

zkan · Accepted Answer · 2013-01-17 06:00:37Z

4

Here you need to add cv2.waitKey() after cv2.imshow('gray_image',imgray). This function is for handling any window event like creating or showing an image in OpenCV.

answered Jan 17, 2013 at 6:00

zkan

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