CODEWITHSUNDEEP
iosobjective-cgpuimagegpuimagestillcamera
MobileMon
MobileMon

Reputation: 8651

GPUImage apply filter to GPUImageView

I use GPUImageStillCamera to take a picture and load the picture into a GPUImageView

Now how can I apply a filter to a still GPUImageView?

The only examples I see online are to first create a GPUImagePicture (which requires a UIImage) but it seems rather wasteful to have to create a UIImage from GPUImageView then load it into the GPUImagePicture when I could just apply the filters to the GPUImageView directly. But I don't know how

I've tried:

  GPUImageFilter *sepiaFilter [[GPUImageSepiaFilter alloc]init];
  [sepiaFilter addTarget:gpuImageView];

  //and then tried these in a bunch of different orders
  [filter useNextFrameForImageCapture];
  [currentFilter endProcessing];
  [currentFilter imageFromCurrentFramebuffer];

EDIT: Here is how I load the image into the GPUImageView

self.stillCamera = [[GPUImageStillCamera alloc]
                        initWithSessionPreset:AVCaptureSessionPresetPhoto
                        cameraPosition:AVCaptureDevicePositionFront];
self.stillCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
self.filterEmpty = [[GPUImageGammaFilter alloc] init];

[self.stillCamera addTarget:self.filterEmpty];


[self.filterEmpty addTarget:self.capturedImageView];
[self.stillCamera startCameraCapture];


[self.stillCamera capturePhotoAsJPEGProcessedUpToFilter:self.filterEmpty withCompletionHandler:^(NSData *processedJPEG, NSError *error){

[self.stillCamera stopCameraCapture];

//and then from here the gpuimageview is loaded with the taken picture

Upvotes: 1

Views: 1126

Answers (1)

Can Poyrazoğlu
Can Poyrazoğlu

Reputation: 34780

Have a regular image view on top of GPUImageView.

Let's call that UIImageVIew imageView.

[self.stillCamera capturePhotoAsImageProcessedUpToFilter:self.filterEmpty 
   withCompletionHandler:^(UIImage *processedImage, NSError *error) {
      imageView.image = processedImage;
      //stop, dispose of, or just continue with the camera,
      //depending on what you want with your app.
}];

At least, this is how I do it on a realtime photo filtering app, and it works perfectly.

Upvotes: 0

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