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Tipps for optimizing target image

Hi everyone,

currently I'm working on an overlay for a piano with the Epson BT-200, so I decided to try to recognize the piano via the keyboard / keys. But because the white and black keys are big areas of the same color and it is a repetetive pattern the sdk has its problem with recognizing it.

That is the image I've worked with so far:


Maybe someone of you can give me a tip on how to recognize the keyboard better.

What is not suitable for me is:

- Trying to recognize the piano with another part then the keyboard, because my App has to work with different pianos and as they are built very differently i can't use another feature of my special piano.

- To large markers or similar, because they have to stay on the piano while it is played. So they mustn't disturb the piano player.

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