Python实现投影法分割图像示例(一)

投影法多用于图像的阈值分割。闲话不多说，现用Python实现。

上代码。

import cv2import numpyimg = cv2.imread('D:/0.jpg', cv2.COLOR_BGR2GRAY)height, width = img.shape[:2]#resized = cv2.resize(img, (3*width,3*height), interpolation=cv2.INTER_CUBIC)#二值化(_, thresh) = cv2.threshold(img, 150, 255, cv2.THRESH_BINARY) #cv2.imshow('thresh', thresh)#扩大黑色面积，使效果更明显kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (10, 10))#形态学处理，定义矩形结构closed = cv2.erode(thresh, None, iterations = 5)cv2.imshow('erode',closed)height, width = closed.shape[:2]v = [0]*widthz = [0]*heighta = 0#垂直投影#统计并存储每一列的黑点数for x in range(0, width):     for y in range(0, height):  if closed[y,x][0] == 0:   a = a + 1  else :   continue v[x] = a a = 0l = len(v)#print l#print width#创建空白图片，绘制垂直投影图emptyImage = numpy.zeros((height, width, 3), numpy.uint8) for x in range(0,width): for y in range(0, v[x]):  b = (255,255,255)  emptyImage[y,x] = bcv2.imshow('chuizhi', emptyImage)#水平投影#统计每一行的黑点数a = 0emptyImage1 = numpy.zeros((height, width, 3), numpy.uint8) for y in range(0, height): for x in range(0, width):  if closed[y,x][0] == 0:   a = a + 1  else :   continue z[y] = a a = 0l = len(z)#print l#print height#绘制水平投影图for y in range(0,height): for x in range(0, z[y]):  b = (255,255,255)  emptyImage1[y,x] = bcv2.imshow('shuipin', emptyImage1)cv2.waitKey(0)

原图

垂直投影图

水平投影图

由这两图可以确定我们所需的分割点，从而可以进行下一步的文本分割。这将在下一篇博客中实现。

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