OnfivObject Transformation

MIP
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1

I’m banging my head against the wall with the OnvifObject transformation. How can I translate and scale my bounding box to fit the image size? Or convert a Rectangle to X, Y, Width and Height.

2 
Transformation transformation = new Transformation()
            {
                Translate = new Vector()
                {
                    X = -1,
                    Y = -1
                },
                Scale = new Vector()
                {
                    X = 2f / imgWidth,
                    Y = 2f / imgHeight
                }
            };

BoundingBox = new Rectangle()
                            {
                                Left = rect.X,
                                Right = rect.X + rect.Width,
                                Bottom = imgHeight - rect.Y,
                                Top = imgHeight - rect.Y - rect.Height
                            };

For some reason the Y axis in the translate vector is not behaving as the X axis. I need to subtract the Y as opposed to the X where I can just add.