与在OpenCV Python中创建RGB图像的蒙版相关的问题 [英] Issues related to creating mask of an RGB image in opencv python

问题描述

我想基于像素值创建RGB图像的蒙版，但以下代码段会引发错误

I want to create a mask of a RGB image based on a pixel value but the following code segment throws error

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

如果有必要，我可以提供图像.

I can provide the image if it is at all required.

这是代码段

image = cv2.imread("abcd.png")
for k in range(image.shape[0]):
    for l in range(image.shape[1]):
        if(image[k][l]==[255,255,255]):
            mask[k][l]=255
        else:
            mask[k][l]=0

我想知道代码中的问题是什么?

I wonder what is the problem in the code?

推荐答案

使用for循环遍历像素非常慢-尝试养成使用Numpy对向量进行矢量化处理的习惯.

Iterating over pixels with for loops is seriously slow - try to get in the habit of vectorising your processing with Numpy.

import numpy as np
import cv2

# Load image
image = cv2.imread("start.png")

# Mask of white pixels - elements are True where image is White
Wmask =(im[:, :, 0:3] == [255,255,255]).all(2) 

# Save as PNG
cv2.imwrite('result.png', (Wmask*255).astype(np.uint8))

因此，从这张图片开始:

So, starting with this image:

您将获得此面具:

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