如何使用CIDetector和Swift在Image中裁剪检测到的矩形

时间:2016-03-24 09:40:22

标签: ios swift avcapturesession cidetector

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?

2 个答案:

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)!)