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我开始使用startCameraCapture并使用setFrameProcessingCompletionBlock拍摄相机GPUImageOutput（我的背景图像）。现在我希望每一帧都从其他捕获的帧中减去我的背景图像。
startCameraCapture
setFrameProcessingCompletionBlock
GPUImageOutput
我怎样才能做到这一点？谢谢