- (UIImage *)generateRectImageWithImage:(UIImage *)inputImage{
CIContext *context = [CIContext contextWithOptions:nil];
CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeRectangle context:context options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];
CIImage *image = [CIImage imageWithCGImage:inputImage.CGImage];
NSArray*features = [detectorfeaturesInImage:image];
CIRectangleFeature *feature = [features firstObjectKGSafeClass:[CIRectangleFeature class]];
NSMutableDictionary *rectCoords = [[NSMutableDictionary alloc] init];
rectCoords[@"inputTopLeft"] = [CIVectorvectorWithCGPoint:feature.topLeft];
rectCoords[@"inputTopRight"] = [CIVector vectorWithCGPoint:feature.topRight];
rectCoords[@"inputBottomLeft"] = [CIVector vectorWithCGPoint:feature.bottomLeft];
rectCoords[@"inputBottomRight"] = [CIVector vectorWithCGPoint:feature.bottomRight];
CIImage *testCIImage = [image imageByApplyingFilter:@"CIPerspectiveCorrection" withInputParameters:rectCoords];
UIImage*cImage = [UIImageimageWithCIImage:testCIImage];
if(cImage) {
}
returncImage;
}
iOS图片矩形边缘检测&截取矩形内容
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