如何在图像上应用Perspective 3d变换并将该图像保存在文档目录中 [英] How to apply Perspective 3d Transform on image and save that image in document directory

问题描述

我正在通过跟踪代码在图像层上应用3D变换.

I am applying 3D transform on a image layer by follow code.

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];

以下是将点转换为变换的起点.

Following is the from which the points are converted to transform.

UIView +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，我使用了以下代码，并使用renderInContext.

For Saving the transform Image to UIImage i have used following code using renderInContext.

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

和第二个使用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();

我正在获取原始的带框方形图像，而不是转换后的图像.实际上，我需要将3d变换图像保存在文档目录中.

I am getting a original framed square image not transformed image. I actually require a 3d transform image to be saved in the document directory.

先谢谢了.任何建议和答案都是最欢迎的.

Thanks in advance. Any suggestion and answers are most welcome.

推荐答案

您可以通过

快速版本

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;
}

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