我能够获取在 iOS 11 的视觉框架视频源中检测到的文本矩形,但我正在尝试获取被识别为文本或字符的视频的图像部分。有人可以帮忙吗?
func detectTextHandler(request: VNRequest, error: Error?) {
guard let observations = request.results else {
print("no result")
return
}
let result = observations.map({$0 as? VNTextObservation})
DispatchQueue.main.async() {
self.imageView.layer.sublayers?.removeSubrange(1...)
for region in result {
guard let rg = region else {
continue
}
self.highlightWord(box: rg)
if let boxes = region?.characterBoxes {
for characterBox in boxes {
self.highlightLetters(box: characterBox)
}
}
}
}
}
那么我怎样才能得到图像的一部分region?.characterBoxes