Method read

rustcv-camera/src/videocapture.rs:72–74

Read the next frame, decoded as BGR, into the provided [`Mat`]. 读取下一帧，解码为 BGR，写入提供的 [`Mat`]。 The `Mat` is reused across calls — its internal buffer is only reallocated if the resolution changes. This makes the hot loop allocation-free after the first frame. `Mat` 跨调用复用 —— 仅在分辨率变化时重新分配内部缓冲区。 这使得在第一帧之后的热循环完全无分配。 Returns `true` if a frame was successfully captured. 成功采集到帧时返回 `true`。

(&mut self, mat: &mut Mat)

    /// Returns `true` if a frame was successfully captured.
    /// 成功采集到帧时返回 `true`。
    pub fn read(&mut self, mat: &mut Mat) -> Result<bool> {
        self.camera.read_decoded(mat)
    }

    /// Check if the camera is successfully opened.
    /// 检查摄像头是否已成功打开。