what image format is best for face recognition

asked 2016-10-05 09:08:08 -0600

atv
11 ●2 ●6

I read somewhere on the forum that jpeg's should be avoided. Why is that and what file format would suit it best instead. PNG ?

answered 2016-10-05 10:58:16 -0600

berak
32993 ●7 ●81 ●312

png is probably your best choice (non-lossy, still allows some compression) .

jpg's should be avoided for 2 reasons here:

lossy compression. you won't get exactly the same pixels on a different machine or a with a different program.
compression artefacts. jpg processes 8x8 pixels patches, which leaves a border, almost invisible to the human eye, but if you try LBPH face-reco on this, you get clear artefacts (edges) that get in your way.

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Thanks berak. Certainly helpful. Do these artifacts appear with fisherfaces as well? I'll have a go tonight and see if it makes any difference there.

atv ( 2016-10-05 11:53:34 -0600 )edit

The artefacts generated by jpeg compression screw up almost every decent computer vision algorithm depending on local gradients or pixel intensities. So yes, also fisherfaces will be influenced!

StevenPuttemans ( 2016-10-07 03:19:31 -0600 )edit

That's awesome, thanks for your comment Steven.

atv ( 2016-10-07 05:25:14 -0600 )edit

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