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#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize imageView;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSString* filename = [[NSBundle mainBundle] pathForResource:@"openCV" ofType:@"jpg"];
UIImage *image = [UIImage imageWithContentsOfFile:filename];
if(image != nil) {
cv::Mat m, gray;
UIImageToMat(image, m);
cv::cvtColor(m, gray, CV_RGBA2GRAY);
cv::GaussianBlur(gray, gray, cv::Size(5, 5), 1.2, 1.2);
cv::Canny(gray, gray, 0, 50);
m = cv::Scalar::all(255);
m.setTo(cv::Scalar(0, 128, 255, 255), gray);
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.image = MatToUIImage(m);
}
}
- (void)viewDidUnload
{
[self setImageView:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
static UIImage* MatToUIImage(const cv::Mat& m) {
CV_Assert(m.depth() == CV_8U);
NSData *data = [NSData dataWithBytes:m.data length:m.elemSize()*m.total()];
CGColorSpaceRef colorSpace = m.channels() == 1 ?
CGColorSpaceCreateDeviceGray() : CGColorSpaceCreateDeviceRGB();
CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
// Creating CGImage from cv::Mat
CGImageRef imageRef = CGImageCreate(m.cols, m.cols, m.elemSize1()*8, m.elemSize()*8,
m.step[0], colorSpace, kCGImageAlphaNoneSkipLast|kCGBitmapByteOrderDefault,
provider, NULL, false, kCGRenderingIntentDefault);
UIImage *finalImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef); CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace); return finalImage;
}
static void UIImageToMat(const UIImage* image, cv::Mat& m) {
CGColorSpaceRef colorSpace = CGImageGetColorSpace(image.CGImage);
CGFloat cols = image.size.width, rows = image.size.height;
m.create(rows, cols, CV_8UC4); // 8 bits per component, 4 channels
CGContextRef contextRef = CGBitmapContextCreate(m.data, m.cols, m.rows, 8, m.step[0], colorSpace, kCGImageAlphaNoneSkipLast |kCGBitmapByteOrderDefault);
CGContextDrawImage(contextRef, CGRectMake(0, 0, cols, rows), image.CGImage);
CGContextRelease(contextRef); CGColorSpaceRelease(colorSpace);
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (IBAction)effectButtonPressed:(id)sender {
}
@end |
