Capturing image preview as like as on the screen with AVFoundation - ios

Question

I set the AVCaptureSession preset PhotoPreset
self.session.sessionPreset = AVCaptureSessionPresetPhoto;
and then adding a new layer into my view with
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
CALayer *rootLayer = [self.view layer];
[rootLayer setMasksToBounds:YES];
[previewLayer setFrame:[rootLayer bounds]];
[rootLayer addSublayer:previewLayer];
So far so good, However when I want to capture an image, I use the code below
AVCaptureConnection *videoConnection = [self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo];
[self.stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
{
[self.session stopRunning];
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData ];
self.imageView.image = image; //IMAGEVIEW IS WITH THE BOUNDS OF SELF.VIEW
image = nil;
}];
Capturing an image is fine however, the captured image is different comparing to AVCaptureVideoPreviewLayer showing on the screen. What I really want to do is to show captured as like as appearing on AVCapturePreviewLayer layer. How can I achieve this? How should I resize and crop the captured image with respect to the bounds of self.view?

Answer 1

i am not sure this will help you or not but as you talking about cropping images so i crop image in ImagePickerView with following code I am not sure this will help you or not
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info {
self.lastChosenMediaType = [info objectForKey:UIImagePickerControllerMediaType];
if ([lastChosenMediaType isEqual:(NSString *)kUTTypeImage]) {
UIImage *chosenImage = [info objectForKey:UIImagePickerControllerEditedImage];
UIImage *shrunkenImage = shrinkImage(chosenImage, imageFrame.size);
self.imagee = shrunkenImage;
selectImage.image = imagee;
} [picker dismissModalViewControllerAnimated:YES];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissModalViewControllerAnimated:YES];
}
// function for cropping images you can do some changes in parameter as per your requirements
static UIImage *shrinkImage(UIImage *original, CGSize size) {
CGFloat scale = [UIScreen mainScreen].scale;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, size.width * scale,
size.height * scale, 8, 0, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context,
CGRectMake(0, 0, size.width * scale, size.height * scale),
original.CGImage);
CGImageRef shrunken = CGBitmapContextCreateImage(context);
UIImage *final = [UIImage imageWithCGImage:shrunken];
CGContextRelease(context);
CGImageRelease(shrunken);
return final;
}