python实现opencv学习二十二：分水岭分割算法

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分水岭分割流程：图像->灰度->二值->距离变换->寻找种子->生成Marker->分水岭变换->输出

具体代码如下：

# -*- coding=GBK -*-
import cv2 as cv
import  numpy as np# 分水岭算法
def water_image():print(src.shape)blurred = cv.pyrMeanShiftFiltering(src, 10, 100)    # 去除噪点# gray\binary imagegray = cv.cvtColor(blurred, cv.COLOR_BGR2GRAY)ret, binary = cv.threshold(gray, 0, 255, cv.THRESH_BINARY | cv.THRESH_OTSU)cv.imshow("二值图像", binary)# morphology operationkernel = cv.getStructuringElement(cv.MORPH_RECT, (3, 3))mb = cv.morphologyEx(binary, cv.MORPH_OPEN, kernel, iterations=2)sure_bg = cv.dilate(mb, kernel, iterations=3)cv.imshow("形态操作", sure_bg)# distance transformdist = cv.distanceTransform(mb, cv.DIST_L2, 3)dist_output = cv.normalize(dist, 0, 1.0, cv.NORM_MINMAX)cv.imshow("距离变换", dist_output*70)ret, surface = cv.threshold(dist, dist.max()*0.6, 255, cv.THRESH_BINARY)cv.imshow("寻找种子", surface)surface_fg = np.uint8(surface)unknown = cv.subtract(sure_bg, surface_fg)ret, markers = cv.connectedComponents(surface_fg)print(ret)# watershed transfrommarkers += 1markers[unknown == 255] = 0markers = cv.watershed(src, markers=markers)src[markers == -1] = [0, 0, 255]cv.imshow("分水岭结果", src)src = cv.imread("C://02.png")
cv.imshow("原来", src)
water_image()
cv.waitKey(0)
cv.destroyAllWindows()

运行结果如下：

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