第十八天opencv膨胀腐蚀

膨胀就是相邻三个像素点||       腐蚀就是相邻三个像素点&&

膨胀作用：将多余相素放大。去除  （增大白色面积）

腐蚀作用：将多余相素去掉再缩小。恢复原图.   （增大相邻黑色面积）

import cv2 as cv
import numpy as np

def erode_demo(image):
    print(image.shape)
    gray = cv.cvtColor(image, cv.COLOR_BGR2GRAY)
    ret, binary = cv.threshold(gray, 0, 255, cv.THRESH_BINARY | cv.THRESH_OTSU)
    cv.imshow("binary", binary)
    kernel = cv.getStructuringElement(cv.MORPH_RECT, (15, 15))       ##得到15*15尺寸的结构元数
    dst = cv.erode(binary, kernel)             ##腐蚀
    cv.imshow("erode_demo", dst)

def dilate_demo(image):
    print(image.shape)
    gray = cv.cvtColor(image, cv.COLOR_BGR2GRAY)
    ret, binary = cv.threshold(gray, 0, 255, cv.THRESH_BINARY | cv.THRESH_OTSU)
    cv.imshow("binary", binary)
    kernel = cv.getStructuringElement(cv.MORPH_RECT, (5, 5))
    dst = cv.dilate(binary, kernel)      ##膨胀
    cv.imshow("dilate_demo", dst)

print("--------- Python OpenCV Tutorial ---------")
src = cv.imread("C:/Users/weiqiangwen/Desktop/sest/data/pca_test1.jpg")
cv.namedWindow("coins", cv.WINDOW_AUTOSIZE)
cv.imshow("coins.jpg", src)
erode_demo(src)
dilate_demo(src)
cv.waitKey(0)

cv.destroyAllWindows()