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import sys
import cv2
import numpy as np
import matplotlib . pyplot as plt
def Prewitt ( img_path ) :
img = cv2 . imread ( img_path , 0 ) # 读取图片
# 边缘检测----Prewitt算子
kernelx = np . array ( [ [ 1 , 1 , 1 ] , [ 0 , 0 , 0 ] , [ - 1 , - 1 , - 1 ] ] , dtype = int )
kernely = np . array ( [ [ - 1 , 0 , 1 ] , [ - 1 , 0 , 1 ] , [ - 1 , 0 , 1 ] ] , dtype = int )
x = cv2 . filter2D ( img , cv2 . CV_16S , kernelx )
y = cv2 . filter2D ( img , cv2 . CV_16S , kernely )
# 转uint8
absX = cv2 . convertScaleAbs ( x )
absY = cv2 . convertScaleAbs ( y )
# 加权
Prewitt = cv2 . addWeighted ( absX , 0.5 , absY , 0.5 , 0 )
cv2 . imwrite ( ' ./output/Prewitt.jpg ' , Prewitt )
'''
输入：一张灰度图
输出：
'''
if __name__ == ' __main__ ' :
Prewitt ( sys . argv [ 1 ] )
