hi all,
i want to share my way to use libjpeg loading options. here my addition to source https://github.com/Itseez/opencv/pull/4162/files
by this change i can set "scale_denom" parameter and load jpeg images scaled 1/2 - 1/4 - 1/8
also i wonder if it worth to merge to opencv library after revised by opencv gurus here. any comment is welcome
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