zbl 0.1.1

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zbl

zbl is a Rust and Python library aiming to make it easier to integrate OpenCV (and possibly other CV libraries) with Windows Desktop apps for real-time processing. It does so by providing a simplified interface to Windows.Graphics.Capture.

This library is not well-tested against corner cases, and was only verified to work for a 'happy path' scenarios, so beware of bugs!

Python

Installation

pip install zbl

Alternatively, you can install suitable wheel from releases page.

Usage

from zbl import Capture

with Capture(window_name='visual studio code') as cap:
    frame = next(cap.frames())
    print(frame.shape)

The snippet above will capture a window which title contains the string visual studio code, take one frame (which is represented as a numpy array) and print its shape.

See Capture constructor for more options. It is possible to capture the entire screen using display_id argument, for example.

To run an example using OpenCV's highgui:

1. Install opencv-python
2. Run python -m zbl --window-name '<full or partial window name, case insensitive>'

Rust

See examples. Note: if you are getting OpenCV build errors when building the example, check out how to build OpenCV rust bindings.

Why not mss / pyautogui?

Those are the definition of "slow" at the time of writing. mss tops at 30-50 fps in a tight loop, pyautogui is even slower than that. Due to GPU accel which comes with D3D11, zbl captures at 500-700 fps - an order of magnitude faster, which allows a lot more time for the actual processing.

Why Rust for the native code part and not C++ / C#?

I need it for the Rust project, hence it is in Rust.

Credits

zbl is heavily inspired by screenshot-rs.