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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

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0 回答 0