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Sobel edge detection with kernel size and magnitude of x and y edge detection
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# Define a function to return the magnitude of the gradient | |
# for a given sobel kernel size and threshold values | |
def mag_thresh(img, sobel_kernel=3, mag_thresh=(0, 255)): | |
# Convert to grayscale | |
gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY) | |
# Take both Sobel x and y gradients | |
sobelx = cv2.Sobel(gray, cv2.CV_64F, 1, 0, ksize=sobel_kernel) | |
sobely = cv2.Sobel(gray, cv2.CV_64F, 0, 1, ksize=sobel_kernel) | |
# Calculate the gradient magnitude | |
gradmag = np.sqrt(sobelx**2 + sobely**2) | |
# Rescale to 8 bit | |
scale_factor = np.max(gradmag)/255 | |
gradmag = (gradmag/scale_factor).astype(np.uint8) | |
# Create a binary image of ones where threshold is met, zeros otherwise | |
binary_output = np.zeros_like(gradmag) | |
binary_output[(gradmag >= mag_thresh[0]) & (gradmag <= mag_thresh[1])] = 1 | |
# Return the binary image | |
return binary_output |
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