ios - 检测带有矩形的文本而不是整个屏幕的视觉，iOS，Swift
<p><p>我使用 Vision 进行文本检测，但这会在整个屏幕上显示检测，有没有办法让它只检测特定区域，例如我在屏幕中间绘制的矩形。</p>
<p>所以当整个屏幕是一个摄像头时，如果文本在中心进入一个矩形，它会在其周围绘制框。</p>
<p> <a href="/image/4Da7J.jpg" rel="noreferrer noopener nofollow"><img src="/image/4Da7J.jpg" alt="Photo of how I want it"/></a> </p>
<p>下面是我的文本检测代码和 <code>cameraPreviewLayer</code>。</p>
<p>如果可能的话，我是否需要 2 个相机预览层？ </p>
<pre><code>func setupPreviewLayer() {
cameraPreviewlayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewlayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewlayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewlayer?.frame = self.view.frame
self.view.layer.insertSublayer(cameraPreviewlayer!, at: 0)
}
func startTextDetection() {
let textRequest = VNDetectTextRectanglesRequest(completionHandler: self.detectTextHandler)
textRequest.reportCharacterBoxes = true
self.requests =
}
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.cameraPreviewlayer?.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)
}
}
}
}
}
func highlightWord(box: VNTextObservation) {
guard let boxes = box.characterBoxes else {
return
}
var maxX: CGFloat = 9999.0
var minX: CGFloat = 0.0
var maxY: CGFloat = 9999.0
var minY: CGFloat = 0.0
for char in boxes {
if char.bottomLeft.x < maxX {
maxX = char.bottomLeft.x
}
if char.bottomRight.x > minX {
minX = char.bottomRight.x
}
if char.bottomRight.y < maxY {
maxY = char.bottomRight.y
}
if char.topRight.y > minY {
minY = char.topRight.y
}
}
let xCord = maxX * (cameraPreviewlayer?.frame.size.width)!
let yCord = (1 - minY) * (cameraPreviewlayer?.frame.size.height)!
let width = (minX - maxX) * (cameraPreviewlayer?.frame.size.width)!
let height = (minY - maxY) * (cameraPreviewlayer?.frame.size.height)!
let outline = CALayer()
outline.frame = CGRect(x: xCord, y: yCord, width: width, height: height)
outline.borderWidth = 2.0
outline.borderColor = UIColor.red.cgColor
cameraPreviewlayer?.addSublayer(outline)
}
func highlightLetters(box: VNRectangleObservation) {
let xCord = box.topLeft.x * (cameraPreviewlayer?.frame.size.width)!
let yCord = (1 - box.topLeft.y) * (cameraPreviewlayer?.frame.size.height)!
let width = (box.topRight.x - box.bottomLeft.x) * (cameraPreviewlayer?.frame.size.width)!
let height = (box.topLeft.y - box.bottomLeft.y) * (cameraPreviewlayer?.frame.size.height)!
let outline = CALayer()
outline.frame = CGRect(x: xCord, y: yCord, width: width, height: height)
outline.borderWidth = 1.0
outline.borderColor = UIColor.blue.cgColor
cameraPreviewlayer?.addSublayer(outline)
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我通过添加发现了这一点。</p>
<pre><code>let wordRect = CGRect(x: xCord, y: yCord, width: width, height: height)
guard regionOfInterest.contains(wordRect.origin) else { return } // only draw a box if the orgin of the word box is within the regionOfInterest
</code></pre>
<p>之前</p>
<pre><code> let outline = CALayer()
outline.frame = CGRect(x: xCord, y: yCord, width: width, height: height)
outline.borderWidth = 1.0
outline.borderColor = UIColor.blue.cgColor
cameraPreviewlayer?.addSublayer(outline)
</code></pre>
<p>这样它只会运行矩形中单词的代码
我将单词 rect 设置为我只想在其中显示文本的 uiview 大小的框架。</p></p>
<p style="font-size: 20px;">关于ios - 检测带有矩形的文本而不是整个屏幕的视觉，iOS，Swift，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/46044381/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/46044381/
</a>
</p>
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