2D depth calculation algorithm?

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Okay, so I'm developing a VLC plugin in Visual C++ (as a dll) to act as a "filter." To be exact, the pixels are passed through unmodified, but are also copied to a texture on an OpenGL-rendered quad in a separate window created by the dll. I'm hoping to create a grayscale frame for each input frame, in real time, which represents a decent depth calculation.

To be clear, I'm not looking for an algorithm which works 100% of the time, because such a thing clearly doesn't exist. I'm searching for the techniques similar to the closed-source commercial program "Cyberlink Power DVD."

And no, Google (as well as previously asked questions on this website) were of no help to me. I looked.

And pretty please, if you have an answer for me that is very complicated, may I have some pseudo code? Those Wikipedia-style formulas give me headaches.

Thank you!

asked 1 min ago

Adolif4

1