[英]Crop Area of UIImage with subview rect
This is my dilemma. 这是我的困境。 I built a QR Scanner and need to crop out the top left colored portion of the QR Code into it's own image for further processing.
我构建了一个QR扫描仪,需要将QR码的左上角颜色部分裁剪为自己的图像,以进行进一步处理。
The blue bounding box is a subview of self.view, and the red bounding box is a subview of the blue bounding box. 蓝色边界框是self.view的子视图,红色边界框是蓝色边界框的子视图。 Im using AVCaptureStillImageOutput to generate the image;
我使用AVCaptureStillImageOutput生成图像; code below..
下面的代码
[_imageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
NSData *jpegData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *takenImage = [UIImage imageWithData:jpegData];
//crop and process takenImage
// tried utilizing convertRect:toView: and crop result is completely wrong.
CGRect redFrame = [_colorBox convertRect:_colorBox.bounds toView:self.view];
}];
Id really appreciate any assistance with this as I've been at it for days, and am at my wits end. 我很感谢我提供的帮助,因为我已经为此工作了好几天,并且精疲力尽。 Thanks!
谢谢!
CGSize screenS = supperFrame.size;
CGFloat delX = image.size.width / screenS.width;
CGFloat delY = image.size.height / screenS.height;
CGRect sourceRect = CGRectMake(frame.origin.x * delX, frame.origin.y * delY, frame.size.width * delX, frame.size.height * delY);
CGImageRef imageRef = CGImageCreateWithImageInRect(image.CGImage, sourceRect);
UIImage *cropImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return cropImage;
- (UIImage *)imageAtFrameImage:(UIImage *)image creopFrame:(CGRect)creopFrame supperFrame:(CGRect)supperFrame {
CGSize screenS = supperFrame.size;
CGFloat delX = image.size.width / screenS.width;
CGFloat delY = image.size.height / screenS.height;
CGRect sourceRect = CGRectMake(creopFrame.origin.x * delX, creopFrame.origin.y * delY, creopFrame.size.width * delX, creopFrame.size.height * delY);
CGImageRef imageRef = CGImageCreateWithImageInRect(image.CGImage, sourceRect);
UIImage *cropImage = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
return cropImage;
}
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