如何在我的python程序中计算canny图像的非零像素数 [英] how to Count the number of non zero pixels of the canny image in my python program

问题描述

我正在尝试查找佳能图像的非零像素数量，您能帮忙吗?

I'm trying to find the number of non zero pixels of the canny image, could you help?

这是我的代码:

import cv
def doCanny(input, lowThresh, highThresh, aperture):
    if input.nChannels != 1:
            return(0)
    out = cv.CreateImage((input.width, input.height), input.depth, 1)
    cv.Canny(input, out, lowThresh, highThresh, aperture)
    return out
def doPyrDown(input):
    assert(input.width !=0 and input.height !=0)
    out = cv.CreateImage((input.width/2, input.height/2), input.depth, input.nChannels)
    cv.PyrDown(input, out)
    return out

img = cv.LoadImage('mypic.jpg')
img2 = cv.CreateImage((img.width, img.height), img.depth, 1)
cv.CvtColor(img, img2, cv.CV_BGR2GRAY)
cv.NamedWindow("Example GRAY", cv.CV_WINDOW_AUTOSIZE)
cv.ShowImage("Example GRAY", img2)
img3 = doCanny(img2, 10, 100, 3)
img2 = doPyrDown(img3)
cv.ShowImage("Example 2", img2)
cv.WaitKey(0)

推荐答案

您可以使用opencv的函数 countNonZero 用于计算图像中非零像素的数量.

You can use opencv's function countNonZero for counting the number of non-zero pixels in the image.

img3 = doCanny(img2, 10, 100, 3)
nzCount = cv.CountNonZero(img3);

更新:

在较新版本的OpenCV中，非零计数功能已更新如下:

Update:

In newer versions of OpenCV, the function to count non zeros has been updated as follows:

nzCount = cv2.countNonZero(img3)

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