Tracking Sex: Implications of widespread data leakage and tracking on porn sites

Re:Tracking Sex: Implications of widespread data leakage and... by jedberg on Tuesday July 30, 2019 @01:51PM (#20567326)

Funny related story! At Reddit we built a tool to create thumbnails for webpages. The algo was basically find the biggest “squareish” image and then remove a row or column of pixels. The row/col was chosen based on which one left the image with the most entropy. We kept doing this until the image was a square.

That algo basically cuts off women’s heads and leaves just their cleavage.

Obviously we had to adjust it to try and avoid that, but even today you’ll see thumbnails on Reddit that are just cleavage.

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Re:Tracking Sex: Implications of widespread data leakage and... by namanyayg on Tuesday July 30, 2019 @02:53PM (#20567971)

I thought that a face would contain more entropy than two flesh mounds! Color me surprised. Could the algorithm be tweaked to favor removable from the bottom part of the image, since humans generally perceive from top to bottom? Most images contain the 'meat' at the top or middle, I'd assume?

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Re:Tracking Sex: Implications of widespread data leakage and... by jedberg on Tuesday July 30, 2019 @04:09PM (#20568615)

We thought so to! But it turns out that a nose, mouth, neck, and chest have more entropy than a face.

I don’t remember exactly how we fixed it but I think biasing towards the top was involved.

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Re:Tracking Sex: Implications of widespread data leakage and... by robocat on Tuesday July 30, 2019 @04:32PM (#20568820)

Link from yesterday shows some good examples of the "algo" (seam carving):

https://avikdas.com/2019/07/29/improved-seam-carving-with-fo...

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Re:Tracking Sex: Implications of widespread data leakage and... by sansnomme on Tuesday July 30, 2019 @02:53PM (#20567966)

Seam carving gone wrong?

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