Fingertips detection from image

I have an image that contains a hand. I want to detect the fingertips (marked in red) as shown in the picture below. I used only edge detection and binary segmentation. Can you help me, please?

Answer 1

[Image Analyst]

Dirk-Jan Kroon has done it.

See these File Exchange submissions of his:

https://www.mathworks.com/matlabcentral/fileexchange/26706-active-shape-model-asm-and-active-appearance-model-aam?s_tid=srchtitle

https://www.mathworks.com/matlabcentral/fileexchange/32696-2d-line-curvature-and-normals?s_tid=srchtitle