[英]How to change CIDetector orientation?
所以我试图在Swift中使用CIDetector
创建一个文本检测器。 当我将手机指向一段文字时,它没有检测到它。 但是,如果我将手机转到一边,它可以正常工作并检测到文本。 如何更改它以便以正确的相机方向检测文本? 这是我的代码:
准备文本检测功能:
func prepareTextDetector() -> CIDetector {
let options: [String: AnyObject] = [CIDetectorAccuracy: CIDetectorAccuracyHigh, CIDetectorAspectRatio: 1.0]
return CIDetector(ofType: CIDetectorTypeText, context: nil, options: options)
}
文字检测功能:
func performTextDetection(image: CIImage) -> CIImage? {
if let detector = detector {
// Get the detections
let features = detector.featuresInImage(image)
for feature in features as! [CITextFeature] {
resultImage = drawHighlightOverlayForPoints(image, topLeft: feature.topLeft, topRight: feature.topRight,
bottomLeft: feature.bottomLeft, bottomRight: feature.bottomRight)
imagex = cropBusinessCardForPoints(resultImage!, topLeft: feature.topLeft, topRight: feature.topRight, bottomLeft: feature.bottomLeft, bottomRight: feature.bottomRight)
}
}
return resultImage
}
它的定向方式与左侧相同,但不适用于正确的方向:
您必须使用CIDetectorImageOrientation
,正如Apple在其CITextFeature
文档中所述 :
[...]使用
CIDetectorImageOrientation
选项指定查找直立文本的所需方向。
例如,您需要这样做
let features = detector.featuresInImage(image, options: [CIDetectorImageOrientation : 1])
其中1
是exif数,取决于方向,可以计算如下
func imageOrientationToExif(image: UIImage) -> uint {
switch image.imageOrientation {
case UIImageOrientation.Up:
return 1;
case UIImageOrientation.Down:
return 3;
case UIImageOrientation.Left:
return 8;
case UIImageOrientation.Right:
return 6;
case UIImageOrientation.UpMirrored:
return 2;
case UIImageOrientation.DownMirrored:
return 4;
case UIImageOrientation.LeftMirrored:
return 5;
case UIImageOrientation.RightMirrored:
return 7;
}
}
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