英文:
How to read out a certain display screen area using Python/Tkinter?
问题
假设您正在使用专有程序从摄像机获取到计算机的实时视频数据，该程序将一张1024x1024像素的视频显示在屏幕上。是否可能使用Python/Tkinter编写一个小型GUI程序，其中包含一个可调整大小的窗口，该窗口具有一个透明区域，该区域可以“捕获”放置在其上的背景？
假设您没有直接访问摄像机，我认为这个问题可以归结为以下两个问题：1.) 如何使用Python读取由GPU提供的视频数据，并针对特定屏幕区域进行操作；2.) 是否可以通过透明的Tkinter窗口动态调整读取区域。
一旦弄清楚如何从GPU获取特定屏幕区域，我可能可以解决第2个问题。
请注意，我不想每隔50毫秒拍摄一张屏幕截图，而是真正获取特定显示区域的GPU流，以系统设置的刷新率为准。然后，该流应存储到循环RAM缓冲区以进行实时图像分析。
英文:
Suppose that you are getting a live feed from a camera to your computer using a proprietary program, which is displaying e.g. a 1024x1024 pixel video to your screen. Would it be possible to write a small GUI program using Python/Tkinter, featuring a resizable window with a transparent area which "grabs" the background of whatever the transparent area is placed on top?
Assuming that you don't have direct access to the camera, I suppose this questions comes down to 1.) how one can read the video data provided by your GPU to a certain screen area using Python and 2.) if it is possible to dynamically adjust the readout area via a transparent Tkinter window.
I can probably figure out 2.), once it is clear how to grab a certain screen area from the GPU.
Note that I do not want to take a screenshot every 50 ms or so, but really get the GPU stream for a specific display area, at whatever system refresh rate is set. The stream should then be stored into a circular RAM buffer for live image analysis.
答案1
得分: 1
虽然这似乎并没有直接回答问题，但 Pillow 的 ImageGrab 类提供了屏幕截图功能，并提供定义感兴趣区域的选项：
https://www.simplifiedpython.net/python-screenshot/
然而，它基本上是根据命令进行屏幕截图，而不是利用 GPU 的实际视频流。
英文:
While this does not seem to answer the exact question, pillow's ImageGrabclass provides a screen capturing functionality with the option to define a region of interest:
https://www.simplifiedpython.net/python-screenshot/
However, it basically takes screenshots on command rather than tapping into the actual video stream of the GPU.
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