任意座標の色の抽出

2015/8/11

Python2.7.6, OpenCV3.0

import cv2
import numpy as np

img = cv2.imread('messi5.jpg')

px = img[100,100]
print px
#[157 166 200]

# accessing only blue pixel
blue = img[100,100,0]
print blue
#157

どうもimg[y,x]のようなので注意
また、返す色も[blue, green, red]

マウスの座標位置のHSVを返すイベント

import colorsys

def onMouse(event, x, y, flags, param):
    global image
    color = image[y,x]
    r = color[2]
    g = color[1]
    b = color[0]
    hsv = colorsys.rgb_to_hsv(r/255.0,g/255.0,b/255.0)
    h = int(hsv[0]*180)
    s = int(hsv[1]*255)
    v = int(hsv[2]*255)
    print('HSV: %d,%d,%d' % (h,s,v))

OpenCV-Python Tutorials Basic Operations on Images
http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_core/py_basic_ops/py_basic_ops.html#basic-ops