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private func detectRectangle(in image: CVPixelBuffer) {
let request = VNDetectRectanglesRequest(completionHandler: { (request: VNRequest, error: Error?) in
DispatchQueue.main.async {
guard let results = request.results as? [VNRectangleObservation] else { return }
guard let rect = results.first else{return}
self.drawBoundingBox(rect: rect)
if self.isTapped{
self.isTapped = false
self.doPerspectiveCorrection(rect, from: image)
request.minimumAspectRatio = VNAspectRatio(1.3)
request.maximumAspectRatio = VNAspectRatio(1.6)
request.minimumSize = Float(0.5)
request.maximumObservations = 1
let imageRequestHandler = VNImageRequestHandler(cvPixelBuffer: image, options: [:])
try? imageRequestHandler.perform([request])
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