我正在开发一个检测身份证的应用程序,我正在尝试使用ios内置的CIDetector来检测实时预览中的矩形形状对象。我正在使用本教程中解释的解决方案 CoreImage Detectors
我得到了流动的结果 image
我的问题:有没有办法提取和裁剪检测到的矩形?
答案 0 :(得分:5)
func cropBusinessCardForPoints(image: CIImage, topLeft: CGPoint, topRight: CGPoint, bottomLeft: CGPoint, bottomRight: CGPoint) -> CIImage {
var businessCard: CIImage
businessCard = image.imageByApplyingFilter(
"CIPerspectiveTransformWithExtent",
withInputParameters: [
"inputExtent": CIVector(CGRect: image.extent),
"inputTopLeft": CIVector(CGPoint: topLeft),
"inputTopRight": CIVector(CGPoint: topRight),
"inputBottomLeft": CIVector(CGPoint: bottomLeft),
"inputBottomRight": CIVector(CGPoint: bottomRight)])
businessCard = image.imageByCroppingToRect(businessCard.extent)
return businessCard
}
答案 1 :(得分:-1)
Swift 3,简单的解决方案
让faceScanningArea = CGRect(x:0,y:0,宽度:50,高度:50)
theFaceFrame.image = UIImage(cgImage(orginalImage.image?.cgImage)!. cropping(to:faceScanningArea)!)