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How OpenMP multi-threading can be utilized to parallelize an OpenCV based sequential program? Any example is not found.

Suppose I have to find the negative of a large dimension image, say 1000x1000. If I simply perform pixel value subtraction from 255, it needs to process 10,00,000 numbers of pixels one by one in sequential. If I want to allow OpenMP multi-thread for performing the whole operation partially in several threads which are run on different cores simultaneously. This concept has to be implemented in OpenCV using OpenMP specifications.

How OpenMP multi-threading can be utilized to parallelize an OpenCV based sequential program? Any example is not found.

Suppose I have to find the negative of a large dimension image, say 1000x1000. If I simply perform pixel value subtraction from 255, it needs to process 10,00,000 numbers of pixels one by one in sequential. If I want to allow OpenMP multi-thread for performing the whole operation partially in several threads which are run on different cores simultaneously. This concept has to be implemented in OpenCV using OpenMP specifications. Need a startup program structure to work on parallel image processing. Your advices will be valuable for me. Thanks.