将cv2图像转换为PySDL2表面，以便快速显示在屏幕上
将cv2图像转换为PySDL2表面，以便快速显示在屏幕上
提问于 2013-08-26 06:24:31
我正在使用新的PySDL2包，试图将其与我现有的OpenCV代码接口。我想通过OpenCV的cv2 python接口从网络摄像头捕获一张图像，并使用PySDL2将其显示在屏幕上的窗口中。我想我知道如何正确地将cv2图像格式转换为PySDL2表面，但在下面的代码末尾，我得到的只是一个黑色窗口。如果你能指出我的错误之处，我将不胜感激！
#grab a frame from a webcam
import cv2
vc = cv2.VideoCapture(0)
junk,image = vc.read()
#convert image to sdl format (?)
import sdl2
sbuf = image.tostring()
simage = sdl2.SDL_CreateRGBSurfaceFrom(sbuf,image.shape[0],image.shape[1],24,3*image.shape[0],sdl2.SDL_PIXELFORMAT_BGRA8888,0xff0000, 0x00ff00, 0x0000ff, 0)
#create a window
sdl2.SDL_Init(sdl2.SDL_INIT_VIDEO)
windowSize = (640,480)
window = sdl2.SDL_CreateWindow(b"Hello World",sdl2.SDL_WINDOWPOS_CENTERED, sdl2.SDL_WINDOWPOS_CENTERED,windowSize[0], windowSize[1], sdl2.SDL_WINDOW_SHOWN)
windowSurface = sdl2.SDL_GetWindowSurface(window)
#try to blit the sdl-formatted image to the window
sdl2.SDL_BlitSurface(simage,None,windowSurface,None)
sdl2.SDL_UpdateWindowSurface(window)
sdl2.SDL_FreeSurface(simage)
# pump events to get the window to show and update
while True:
sdl2.SDL_PumpEvents()回答 3
Stack Overflow用户
发布于 2013-10-24 07:29:26
解决了！
#import necessary modules
import cv2
import sdl2
import sdl2.ext
import numpy
windowSize = (640,480)
#initialize the camera
vc = cv2.VideoCapture(0)
vc.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, windowSize[0])
vc.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, windowSize[1])
#grab and show a first frame from the camera
junk,image = vc.read()
cv2.imshow('0',image)
#initialize sdl2
sdl2.ext.init()
window = sdl2.ext.Window("test", size=windowSize)
window.show()
windowSurf = sdl2.SDL_GetWindowSurface(window.window)
windowArray = sdl2.ext.pixels3d(windowSurf.contents)
while True: #keep reading to have a live feed from the cam
junk,image = vc.read()
image = numpy.insert(image,3,255,axis=2) #add alpha
image = numpy.rot90(image) #rotate dims
numpy.copyto(windowArray, image)
window.refresh()我不确定为什么使用cv2.imshow显示相机的第一帧是必要的，但如果没有这一部分，sdl2窗口就永远不会出现。
Stack Overflow用户
发布于 2019-08-21 23:33:56
下面这一行可能会对您有所帮助：
windowArray:，:,0:3 = img.swapaxes(0,1)
#!python3
import cv2
import sdl2
import sdl2.ext
def process_frame(img):
# --- initialize
sdl2.ext.init()
window = sdl2.ext.Window("sdl",size=('width','height'))
window.show()
events = sdl2.ext.get_events()
for event in events:
if event.type == sdl2.SDL_QUIT:
exit(0)
# --- initialize
windowArray = sdl2.ext.pixels3d(window.get_surface())
# --- convert cv2 frame to sdl windowArray
windowArray[:,:,0:3] = img.swapaxes(0,1)
vc = cv2.VideoCapture(0)
while vc.isOpened():
ret,frame = cap.read()
if ret == True:
process_frame(frame)
else:
breakStack Overflow用户
发布于 2018-08-23 16:31:47
我没有足够的声誉来添加评论，尽管这是很久以前的事了，希望这能对某些人有所帮助。
您可以为窗口创建添加标志
window = sdl2.ext.Window("test", size=windowSize, flag=sdl2.SDL_WINDOW_SHOWN)
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/18434348
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