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Speed up or faster alternative to Opencv CascadeClassifier

Hi, I use a cascade classifier from Opencv to detect some objects in real time (12801024px image) but It too slow for me. I use 20 stages cascade on 2020px patch with a scale factor of 1.1. I'm about 2.5FPS on an embedded computer. I would like about 10FPS.

Here is my questions :

Is there some well known bottlenecks in this part of Opencv that I could rapidly fix?

Is there some projects (github ...) to improve this part of Opencv?

Is there some libraries (open source or not) that have a faster implementation of Viola Jones detector (cascade classifier)?