let filter = CIFilter(name: "CIPerspectiveCorrection")!
            let width = CGFloat(image.size.width)
            let height = CGFloat(image.size.height)
            var topLeft = CGPoint(x: rectangle.topLeft.x * width, y: rectangle.topLeft.y * height)
            var topRight = CGPoint(x: rectangle.topRight.x * width, y: rectangle.topRight.y * height)
            var bottomLeft = CGPoint(x: rectangle.bottomLeft.x * width, y: rectangle.bottomLeft.y * height)
            var bottomRight = CGPoint(x: rectangle.bottomRight.x * width, y: rectangle.bottomRight.y * height)

            let scaleH = height/width
            print(width)
            print(height)
            print(topLeft)
            print(topRight)
            print(bottomLeft)
            print(bottomRight)
            func checkRectangle() -> Bool{
                var returnValue = true
                if topRight.y > height - scaleH{
                    returnValue = false
                }
                if topLeft.y > height - scaleH{
                     returnValue = false
                 }
                if bottomLeft.y < scaleH{
                     returnValue = false
                 }
                if bottomRight.y < scaleH{
                    returnValue = false
                }

                if topRight.x > width - 1{
                    returnValue = false
                }
                if topLeft.x < 1{
                     returnValue = false
                 }
                if bottomLeft.x < 1{
                     returnValue = false
                 }
                if bottomRight.x > width - 1{
                    returnValue = false
                }
                return returnValue
            }

            repeat{
                topLeft.y += scaleH
                topLeft.x -= 1

                topRight.y += scaleH
                topRight.x += 1

                bottomRight.y -= scaleH
                bottomRight.x += 1

                bottomLeft.y -= scaleH
                bottomLeft.x -= 1

            }while(checkRectangle())