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[英]How to count number of white and black pixels in color picture in python? How to count total pixels using numpy
[英]how to count black and white pixels in binary image using python
from PIL import Image
import PIL.ImageOps
import cv2
import numpy as np
from matplotlib import pyplot as plt
# read image
img = cv2.imread('bnw11.png')
height, width = img.shape
print "height and width : ",height, width
size = img.size
print "size of the image in number of pixels", size
# plot the binary image
cv2.imshow('binary',img)
當我運行此代碼時,出現以下錯誤:
Traceback (most recent call last):
File "C:/Python27/BnW.py", line 9, in <module>
height, width = img.shape
ValueError: too many values to unpack
我的圖像已經是二進制圖像。我不希望在幾個二進制圖像中計數黑白像素... im newbie..am向您提供任何幫助。
該錯誤是因為img.shape
返回的元組大小大於或小於2,這是您在height, width = img.shape
。 在圖像為numpy數組的情況下,如果是RGB圖像, .shape()
返回3個值,因此您可以將其更改為
height, width, channels = img.shape
但如果GrayScale變成height, width = img.shape
可以正常工作。
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