python-opencv-将像素从bgr转换为hsv [英] python - opencv - convert pixel from bgr to hsv

问题描述

img = cv2.imread('example.jpg')
img_hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
# lower mask (0-10)
lower_red = np.array([0, 50, 50])
upper_red = np.array([10, 255, 255]
mask0 = cv2.inRange(img_hsv, lower_red, upper_red)
# upper mask (170-180)
lower_red = np.array([170, 50, 50])
upper_red = np.array([180, 255, 255])
mask1 = cv2.inRange(img_hsv, lower_red, upper_red)
# join my masks
mask = mask0 + mask1

height = mask.shape[0]
width = mask.shape[1]
# iterate over every pixel
for i in range(height):
    for j in range(width):
        px = mask[i,j]
        print px
        # check if pixel is white or black
        if (px[2] >= 0 and px[2] <= 40):

在上面的示例中，"px"是BGR中的像素.我需要将该值转换为HSV，因为我想检查像素是否在某个颜色范围内.

In the above example 'px' is a pixel in BGR. I need to convert the value to HSV because I want to check if the pixel is in a certain color range.

我已经尝试过

colorsys.rgb_to_hsv(px[2], px[1], px[0})

引发错误:标量变量的索引无效

which evokes the error: invalid index to scalar variable

谢谢！

推荐答案

来自您可以使用内置方法将整个img转换为hsv:

You can just convert your whole img to hsv using the built in method:

hsv_img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)

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