OpenCV- Trackbar 不会出现 - window 不会调整大小

Question

这是我的代码，window 似乎没有调整大小或显示任何轨迹栏。这只是显示一个空白 window.

import cv2

def empty(a):
    pass

cv2.namedWindow("Trackbars")
cv2.resizeWindow("Trackbars",640,300)
cv2.createTrackbar("Hue Min","Trackbars",0,179,empty)
cv2.createTrackbar("Hue Max","Trackbars",179,179,empty)
cv2.createTrackbar("Sat Min","Trackbars",0,255,empty)
cv2.createTrackbar("Sat Max","Trackbars",255,255,empty)
cv2.createTrackbar("Val Min","Trackbars",0,255,empty)
cv2.createTrackbar("Val Max","Trackbars",255,255,empty)

Answer 1

根据 namedWindow API 在 Python 中：

Python:
    None = cv.namedWindow( winname[, flags] )

您应该将 cv2.WINDOW_NORMAL 作为标志参数传递，它使您能够调整 window.

的大小

提醒一下，你不会看到没有循环的window，因为它会在window创建后立即退出。我会建议你在代码末尾添加像 waitKey 这样的循环。

这里是修改后的演示代码：

import cv2

def empty(a):
    pass

cv2.namedWindow("Trackbars", cv2.WINDOW_NORMAL)
cv2.resizeWindow("Trackbars",640,300)
cv2.createTrackbar("Hue Min","Trackbars",0,179,empty)
cv2.createTrackbar("Hue Max","Trackbars",179,179,empty)
cv2.createTrackbar("Sat Min","Trackbars",0,255,empty)
cv2.createTrackbar("Sat Max","Trackbars",255,255,empty)
cv2.createTrackbar("Val Min","Trackbars",0,255,empty)
cv2.createTrackbar("Val Max","Trackbars",255,255,empty)

ch = None
while ch != 27:
    ch = cv2.waitKey(0)

OpenCV- Trackbar 不会出现 - window 不会调整大小

OpenCV- Trackbar wont appear- window wont resize

opencv

opencv-python