Perspective transform to rectangle detected by Vision

perspective.swift

guard let results = request.results as? [VNRectangleObservation] else {
      fatalError("Unexpected result type from VNDetectRectanglesRequest")
    }
    // Need check results only if objectsCountToDetect isn't default
    if objectsCountToDetect != defaultObjectsCount {
      guard results.count == objectsCountToDetect else {
        Logger.e("Wrong Rectangulars Results count: Founded - \(results.count) | Required - \(objectsCountToDetect)")
        return
      }
    }
    
    if isCancelled { return }
    
    self.operationResult = results.compactMap { detectedRectangle in
      let transform = CGAffineTransform.identity
        .scaledBy(x: inputImage.extent.width, y: inputImage.extent.height)
      
      let topLeft = detectedRectangle.topLeft.applying(transform)
      let topRight = detectedRectangle.topRight.applying(transform)
      let bottomLeft = detectedRectangle.bottomLeft.applying(transform)
      let bottomRight = detectedRectangle.bottomRight.applying(transform)
      
      var correctedImage = inputImage
        .applyingFilter("CIPerspectiveCorrection", parameters: [
          "inputTopLeft": CIVector(cgPoint: topLeft),
          "inputTopRight": CIVector(cgPoint: topRight),
          "inputBottomLeft": CIVector(cgPoint: bottomLeft),
          "inputBottomRight": CIVector(cgPoint: bottomRight)
          ])