如何改变 CIDetector 方向?
How to change CIDetector orientation?
所以我正在尝试使用 Swift 中的 CIDetector
制作一个文本检测器。当我将 phone 指向一段文本时,它没有检测到它。但是,如果我将 phone 转到一边,它就会工作并检测到文本。我怎样才能改变它,以便它在正确的相机方向检测文本?这是我的代码:
准备文本检测器函数:
func prepareTextDetector() -> CIDetector {
let options: [String: AnyObject] = [CIDetectorAccuracy: CIDetectorAccuracyHigh, CIDetectorAspectRatio: 1.0]
return CIDetector(ofType: CIDetectorTypeText, context: nil, options: options)
}
文本检测函数:
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
}
当方向像左边时有效,但不适合右边:
你必须使用 CIDetectorImageOrientation
, as Apple stated in its CITextFeature
documentation:
[...] use the CIDetectorImageOrientation
option to specify the desired
orientation for finding upright text.
例如,您需要做
let features = detector.featuresInImage(image, options: [CIDetectorImageOrientation : 1])
其中 1
是 exif 编号并且取决于方向,可以像
一样计算
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;
}
}
所以我正在尝试使用 Swift 中的 CIDetector
制作一个文本检测器。当我将 phone 指向一段文本时,它没有检测到它。但是,如果我将 phone 转到一边,它就会工作并检测到文本。我怎样才能改变它,以便它在正确的相机方向检测文本?这是我的代码:
准备文本检测器函数:
func prepareTextDetector() -> CIDetector {
let options: [String: AnyObject] = [CIDetectorAccuracy: CIDetectorAccuracyHigh, CIDetectorAspectRatio: 1.0]
return CIDetector(ofType: CIDetectorTypeText, context: nil, options: options)
}
文本检测函数:
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
}
当方向像左边时有效,但不适合右边:
你必须使用 CIDetectorImageOrientation
, as Apple stated in its CITextFeature
documentation:
[...] use the
CIDetectorImageOrientation
option to specify the desired orientation for finding upright text.
例如,您需要做
let features = detector.featuresInImage(image, options: [CIDetectorImageOrientation : 1])
其中 1
是 exif 编号并且取决于方向,可以像
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;
}
}