Question

我正在处理面部检测功能并在下面的委托中获取缓冲区但是当我尝试使用CIImage制作UIImage时，我在横向代码中获取图像，我在应用程序中只有纵向：

1） - 在生成会话时，尝试进行肖像模式：

 // previewLayer is kind of AVCaptureVideoPreviewLayer
    if ([self.previewLayer.connection isVideoOrientationSupported])
        [self.previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationPortrait];

2） - 代表：

    - (void)captureOutput:(AVCaptureOutput *)captureOutput
        didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection *)connection

3） - 无法将UIImage旋转为image.CGImage为nil

CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

        ///CVPixelBufferRef pixelBuffer = [self rotateBuffer:sampleBuffer];

        CFDictionaryRef attachments = CMCopyDictionaryOfAttachments(kCFAllocatorDefault, pixelBuffer, kCMAttachmentMode_ShouldPropagate);
        CIImage *ciImage = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer
                                                          options:(__bridge NSDictionary *)attachments]; 
 UIImage *image = [UIImage imageWithCIImage:ciImage];

我不确定从委托获得的图像方向有什么问题，我尝试使用堆栈溢出答案的多个代码捕捉但没有一个能够旋转图像或缓冲区，有些是：

iOS app camera orientation in captureOutput

Rotate CGImage taken from video frame

How to directly rotate CVImageBuffer image in IOS 4 without converting to UIImage?

图像方向问题AVCaptureOutput委托iOS sdk

0 个答案: