[英]How to crop detected rectangle in Image with CIDetector and Swift
我正在開發可檢測身份證的應用程序,並且嘗試使用ios中內置的CIDetector在實時預覽中檢測矩形對象。 我正在使用本教程中在此處解釋的解決方案CoreImage Detectors
我正在得到流動的結果圖像
我的問題:有沒有辦法提取和裁剪檢測到的矩形?
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
}
Swift 3,簡單的解決方案
讓faceScanningArea = CGRect(x:0,y:0,寬度:50,高度:50)
theFaceFrame.image = UIImage(cgImage(orginalImage.image?.cgImage)!. cropping(to:faceScanningArea)!)
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