Couldn't capture overlay image - iphone

Question

I have 3 images. I load one by one to camera overlay image. Then i need to take snapshot. But when i click button it take snapshot of particular image. When i put imageName.png in captureStillImageWithOverlay it take snapshot of that image only, it won't taking other images when present in overlay
Button click code:
- (void)ButtonPressed {
[[self captureManager] captureStillImageWithOverlay:[UIImage imageNamed:#"img2.png"]];
}
Load images:
-(void)loadNextPage:(int)index
{
int countFlag=0;
for(int i=index*4;i<(index+1)*4;i++)
{
UIButton *imageView=[[UIButton alloc]initWithFrame:CGRectMake((320*index)+countFlag*80+ 2, 5, 75, 75)];
imageView.tag=i+1;
[imageView addTarget:self action:#selector(imageViewClicked:) forControlEvents:UIControlEventTouchUpInside];
[imageView.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[imageView.layer setBorderWidth:1.0f];
switch ((i+1)%5) {
case 0:
[imageView setImage:[UIImage imageNamed:#"img1.png"] forState:UIControlStateNormal];
break;
case 1:
[imageView setImage:[UIImage imageNamed:#"img2.png"] forState:UIControlStateNormal];
break;
case 2:
[imageView setImage:[UIImage imageNamed:#"img3.png"] forState:UIControlStateNormal];
break;
}
[myScrollView addSubview:imageView];
[imageView release];
countFlag++;
}
}
Capture overlay image:
- (void)captureStillImageWithOverlay:(UIImage*)overlay
{
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in [[self stillImageOutput] connections]) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
if (videoConnection) {
break;
}
}
NSLog(#"about to request a capture from: %#", [self stillImageOutput]);
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
if (exifAttachments) {
NSLog(#"attachements: %#", exifAttachments);
} else {
NSLog(#"no attachments");
}
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
CGSize imageSize = [image size];
CGSize overlaySize = [overlay size];
UIGraphicsBeginImageContext(imageSize);
[image drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
CGFloat xScaleFactor = imageSize.width / 320;
CGFloat yScaleFactor = imageSize.height / 480;
[overlay drawInRect:CGRectMake(30 * xScaleFactor, 100 * yScaleFactor, overlaySize.width * xScaleFactor, overlaySize.height * yScaleFactor)]; // rect used in AROverlayViewController was (30,100,260,200)
UIImage *combinedImage = UIGraphicsGetImageFromCurrentImageContext();
[self setStillImage:combinedImage];
UIGraphicsEndImageContext();
[image release];
[[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];
}];
}
I take the reference from this url [http://www.musicalgeometry.com/?p=1681]

Answer 1

An overlay is just for presentation in the camera picker.
You also need to combine these images in your final UIImage (JPEG or TIFF or whatever) you save to disk.
Other people have had (and have solved) this same problem as you.
EDIT, here is some code that may help you out:
- (void)captureStillImageWithOverlay:(NSArray *) arrayOfImageFiles
{
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in [[self stillImageOutput] connections]) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
if (videoConnection) {
break;
}
}
NSLog(#"about to request a capture from: %#", [self stillImageOutput]);
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
if (exifAttachments) {
NSLog(#"attachements: %#", exifAttachments);
} else {
NSLog(#"no attachments");
}
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
CGSize imageSize = [image size];
UIGraphicsBeginImageContext(imageSize);
[image drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
CGFloat xScaleFactor = imageSize.width / 320;
CGFloat yScaleFactor = imageSize.height / 480;
for(NSString * imageFileName in arrayOfImageFiles)
{
// images named #"img1" or #"img1.png" should work
UIImage * overlay = [UIImage imageNamed: imageFileName];
if(overlay)
{
CGSize overlaySize = [overlay size];
[overlay drawInRect:CGRectMake(30 * xScaleFactor, 100 * yScaleFactor, overlaySize.width * xScaleFactor, overlaySize.height * yScaleFactor)]; // rect used in AROverlayViewController was (30,100,260,200)
} else {
NSLog( #"could not find an image named %#", imageFileName);
}
}
UIImage *combinedImage = UIGraphicsGetImageFromCurrentImageContext();
[self setStillImage:combinedImage];
UIGraphicsEndImageContext();
[image release];
[[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];
}];
}