如何对图像进行透视三维变换并将该图像保存在文档目录中

我正在按照代码在图像层上应用3D变换。

UIImageView *view = (UIImageView *)[recognizer view]; CGPoint translation = [recognizer translationInView:self.view]; CGPoint newCenter = view.center; newCenter.x += translation.x; newCenter.y += translation.y; view.center = newCenter; [recognizer setTranslation:CGPointZero inView:self.view]; 

以下是从哪些点转换到转换。

UIView的+四边形

 [self.view transformToFitQuadTopLeft:self.topLeftControl.center topRight:self.topRightControl.center bottomLeft:self.bottomLeftControl.center bottomRight:self.bottomRightControl.center]; 

为了将转换图像保存到UIImage我已经使用renderInContext下面的代码。

 UIGraphicsBeginImageContext(view.frame.size); [view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); 

第二个使用drawViewHierarchyInRect

 UIGraphicsBeginImageContextWithOptions(self.toothImageView_1.bounds.size, NO, 0); BOOL ok = [self.toothImageView_1 drawViewHierarchyInRect:self.toothImageView_1.bounds afterScreenUpdates:YES]; UIImage *img = nil; if( ok ) { image = UIGraphicsGetImageFromCurrentImageContext(); } self.imageView.image = image; UIGraphicsEndImageContext(); 

我得到一个原始的框架方形图像不转换图像。 我实际上需要一个3d转换图像保存在文档目录中。

提前致谢。 任何build议和答案是最受欢迎的。

Answer 1

你可以通过Apple提供的CoreImage Framework来完成

 - (UIImage *)imageByTransformingImage:(UIImage *)image { if (image == nil) { return nil; //image not found } CIImage *coreImage = [CIImage imageWithData:UIImagePNGRepresentation(image)]; if (!coreImage) { return nil; // image is not converted in core image } //assuming that topLeft, topRight, bottomRight and bottomLeft stored in transformationDict NSDictionary *dict = [self.transformationDict valueForKey:@"Corners"]; CGPoint topLeftPoint = CGPointFromString([dict valueForKey:kTopLeft]); CGPoint topRightPoint = CGPointFromString([dict valueForKey:kTopRight]); CGPoint bottomRightPoint = CGPointFromString([dict valueForKey:kBottomRight]); CGPoint bottomLeftPoint = CGPointFromString([dict valueForKey:kBottomLeft]); CIFilter *perspectiveTransformation = [CIFilter filterWithName:@"CIPerspectiveTransform"]; [perspectiveTransformation setValue:[CIVector vectorWithCGPoint:topLeftPoint] forKey:@"inputTopLeft"]; [perspectiveTransformation setValue:[CIVector vectorWithCGPoint:topRightPoint] forKey:@"inputTopRight"]; [perspectiveTransformation setValue:[CIVector vectorWithCGPoint:bottomRightPoint] forKey:@"inputBottomRight"]; [perspectiveTransformation setValue:[CIVector vectorWithCGPoint:bottomLeftPoint] forKey:@"inputBottomLeft"]; [perspectiveTransformation setValue:coreImage forKey:kCIInputImageKey]; CIImage *resultImage = [perspectiveTransformation outputImage]; CIContext *ciContext = [CIContext contextWithOptions:nil]; CGImageRef cgImageRef = [ciContext createCGImage:resultImage fromRect:[resultImage extent]]; UIImage *transformedImage = [UIImage imageWithCGImage:cgImageRef]; return transformedImage; //transformed image will be flipped image you need to flip context to get correct UIImage } 

Swift版本

 func imageByTransformingImage(image: UIImage?) -> UIImage? { guard image != nil else { return nil; } if let coreImage = CIImage(data: UIImagePNGRepresentation(image!)!) { //assuming that topLeft, topRight, bottomRight and bottomLeft stored in transformationDict let dict = self.transformationDict.valueForKey("Corners"); let dict = [String : Any](); let topLeftPoint = CGPointFromString(dict["TopLeftCorner"] as! String); let topRightPoint = CGPointFromString(dict["TopRightCorner"] as! String); let bottomRightPoint = CGPointFromString(dict["BottomRightCorner"] as! String); let bottomLeftPoint = CGPointFromString(dict["BottomLeftCorner"] as! String); if let perspectiveTransformation = CIFilter(name: "CIPerspectiveTransform") { perspectiveTransformation.setValue(CIVector(CGPoint: topLeftPoint), forKey: "inputTopLeft"); perspectiveTransformation.setValue(CIVector(CGPoint:topRightPoint), forKey: "inputTopRight"); perspectiveTransformation.setValue(CIVector(CGPoint:bottomRightPoint), forKey: "inputBottomRight"); perspectiveTransformation.setValue(CIVector(CGPoint:bottomLeftPoint), forKey: "inputBottomLeft"); perspectiveTransformation.setValue(coreImage, forKey:kCIInputImageKey); if let resultImage = perspectiveTransformation.outputImage { let ciContext = CIContext() let cgImageRef = ciContext.createCGImage(resultImage, fromRect: resultImage.extent) as CGImageRef return UIImage(CGImage: cgImageRef); //transformed image will be flipped image you need to flip context to get correct UIImage } } } return nil; }