Python | OpenCV BGR 带跟踪条的调色板
原文:https://www . geesforgeks . org/python-opencv-bgr-color-palette-with-track bar/
OpenCV 是一个主要针对实时计算机视觉的编程函数库。 在本文中，让我们创建一个窗口，其中将包含带有跟踪条的 RGB 调色板。通过移动跟踪条，RGB 颜色的值将从 0 变为 255。所以使用相同的方法，我们可以找到具有 RGB 值的颜色。
Libraries needed:
OpenCV
Numpy
方法: 创建一个分辨率为 512 x 512 的三色通道的黑色窗口。然后使用 OpenCV 库的预定义函数创建三个“B”“G”“R”跟踪条。将通道值设置为 0 到 255。将黑色窗口与这些彩色跟踪条合并。
# Python program to create RGB color
# palette with trackbars
# importing libraries
import cv2
import numpy as np
# empty function called when
# any trackbar moves
def emptyFunction():
pass
def main():
# blackwindow having 3 color chanels
image = np.zeros((512, 512, 3), np.uint8)
windowName ="Open CV Color Palette"
# window name
cv2.namedWindow(windowName)
# there trackbars which have the name
# of trackbars min and max value
cv2.createTrackbar('Blue', windowName, 0, 255, emptyFunction)
cv2.createTrackbar('Green', windowName, 0, 255, emptyFunction)
cv2.createTrackbar('Red', windowName, 0, 255, emptyFunction)
# Used to open the window
# till press the ESC key
while(True):
cv2.imshow(windowName, image)
if cv2.waitKey(1) == 27:
break
# values of blue, green, red
blue = cv2.getTrackbarPos('Blue', windowName)
green = cv2.getTrackbarPos('Green', windowName)
red = cv2.getTrackbarPos('Red', windowName)
# merge all three color chanels and
# make the image composites image from rgb
image[:] = [blue, green, red]
print(blue, green, red)
cv2.destroyAllWindows()
# Calling main()
if __name__=="__main__":
main()
输出:
注意:以上程序不会在联机 IDE 上运行。
版权属于：月萌API www.moonapi.com，转载请注明出处
