如何读取中心像素颜色

Question

输入图像link是：Input Image

我想如上所示读取输入图像的中心像素值并检测颜色如果输出颜色为橙色，则打印橙色。但我倾向于得到一个错误

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

代码如图

import numpy as np
import cv2
img = cv2.imread('New Bitmap Image.bmp')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(gray,100,255,cv2.THRESH_BINARY)
contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
cv2.drawContours(img,contours,-1,(0,0,255),19)

for i in range(0,len(contours)):
    M = cv2.moments(contours[i])
    cx = int(M['m10']/M['m00'])
    cy = int(M['m01']/M['m00'])
    print "Centroid = ", cx, ", ", cy

    center_px =  img[cx,cy]
    print center_px
    ORANGE = (0,127,255)

    if (center_px == ORANGE):
            print "Orange"

我正在使用 pyhton 和 cv2

Answer 1

要测试数组是否相等，可以使用numpy.array_equal

center_px = img[cy, cx]
if np.array_equal(center_px, (0, 127, 255)):
    print("Orange")

如何读取中心像素颜色

How to read center pixel color

python

opencv

image-processing

contour