【画像処理】1次微分フィルタ（横、縦） -

自作で微分フィルタを作った。

#!/usr/env/bin python
import cv2
import sys

args = sys.argv

def edge_filter(file):
    image = cv2.imread(file, cv2.IMREAD_GRAYSCALE)
    image = cv2.medianBlur(image, 3)
    (height, width) = image.shape[:2]

    edge_width = image.copy()
    edge_height = image.copy()
    for i in range(1, height-1):
        for j in range(1, width-1):
            left = image[i, j-1] / -2
            right = image[i, j+1] / 2
            top = image[i-1, j] / -2
            bottom = image[i+1, j] / 2

            edge_width[i, j] = abs(left + right)
            edge_height[i, j] = abs(top + bottom)

    cv2.imwrite('gray.png', image)
    cv2.imwrite('edge_width.png', edge_width)
    cv2.imwrite('edge_height.png', edge_height)

if __name__ == '__main__':
     edge_filter(args[1])