Created
May 7, 2013 12:15
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A comic like effect using OpenCV
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import sys | |
import numpy | |
import cv2 | |
def comic(img): | |
# do edge detection on a grayscale image | |
gray = cv2.cvtColor(img, cv2.COLOR_BGRA2GRAY) | |
edges = cv2.blur(gray, (3, 3)) # this blur gets rid of some noise | |
edges = cv2.Canny(edges, 50, 150, apertureSize=3) # this is the edge detection | |
# the edges are a bit thin, this blur and threshold make them a bit fatter | |
kernel = numpy.ones((3,3), dtype=numpy.float) / 12.0 | |
edges = cv2.filter2D(edges, 0, kernel) | |
edges = cv2.threshold(edges, 50, 255, 0)[1] | |
# and back to colour... | |
edges = cv2.cvtColor(edges, cv2.COLOR_GRAY2BGR) | |
# this is the expensive operation, it blurs things but keeps track of | |
# colour boundaries or something, heck, just play with it | |
shifted = cv2.pyrMeanShiftFiltering(img, 5, 20) | |
# now compose with the edges, the edges are white so take them away | |
# to leave black | |
return cv2.subtract(shifted, edges) | |
if __name__ == '__main__': | |
# load | |
img = cv2.imread(sys.argv[1], cv2.CV_LOAD_IMAGE_COLOR) | |
# smaller is quicker | |
img = cv2.resize(img, (800, 600)) | |
cv2.namedWindow('Display Window') | |
cv2.imshow('Display Window', comic(img)) | |
cv2.waitKey(0) |
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