我有一个相机session，我正在从缓冲区拍摄图像:-(void)captureOutput:(AVCaptureOutput*)captureOutputdidOutputSampleBuffer:(CMSampleBufferRef)sampleBufferfromConnection:(AVCaptureConnection*)connection{CVPixelBufferRefpixelBuffer=(CVPixelBufferRef)CMSampleBufferGetImageBuffer(sampleBuffer);CIImage*ciImage=[CIImageimag