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improved convert_images code for JGU-HPC/parallelprogrammingbook chapter7/eigenfaces/data

Python 10.60% C++ 59.62% Cuda 12.08% C 6.51% Jupyter Notebook 11.20%

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convert_images

fastest python script is multiprocessing and turbojpg 8 sec vs 3:30min for singleprocess-original

fastest C++ program is using OpenMP and Turbojpeg; NVJPEG not that fast, probably because of the small image sizes and some CPU work and/or huffman decoding still could be usefull if you use the decoded images afterwards on the GPU (see nvidia's dali, with lot's of image modification options, DALI also uses turbojpeg; NVJPEG lib just decodes)

(https://www.amazon.de/Parallel-Programming-Dr-Bertil-Schmidt/dp/0128498900/ref=sr_1_1?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&keywords=parallel+programming+concepts&qid=1566568475&s=gateway&sr=8-1#customerReviews)

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