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Improve face scoring

old-stable24
Varun Patil 2022-10-20 20:52:47 -07:00
parent b805339c3f
commit 4b390f5ba4
1 changed files with 9 additions and 6 deletions
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15
lib/Db/TimelineQueryFaces.php
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@ -128,8 +128,8 @@ trait TimelineQueryFaces
// Get actual pixel size of face
$iw = min((int) ($p['image_width'] ?: 512), 2048);
$ih = min((int) ($p['image_height'] ?: 512), 2048);
$w = (float) $p['width'] * $iw;
$h = (float) $p['height'] * $ih;
$w = (float) $p['width'];
$h = (float) $p['height'];
// Get center of face
$x = (float) $p['x'] + (float) $p['width'] / 2;
@ -138,12 +138,15 @@ trait TimelineQueryFaces
// 3D normal distribution - if the face is closer to the center, it's better
$positionScore = exp(-($x - 0.5) ** 2 * 4) * exp(-($y - 0.5) ** 2 * 4);
// Root size distribution - if the face is bigger, it's better,
// but it doesn't matter beyond a certain point, especially 256px ;)
$sizeScore = ($w * 100) ** (1 / 4) * ($h * 100) ** (1 / 4);
// Root size distribution - if the image is bigger, it's better,
// but it doesn't matter beyond a certain point
$imgSizeScore = ($iw * 100) ** (1 / 2) * ($ih * 100) ** (1 / 2);
// Faces occupying too much of the image don't look particularly good
$faceSizeScore = (-pow($w, 2) + $w) * (-pow($h, 2) + $h);
// Combine scores
$p['score'] = $positionScore * $sizeScore;
$p['score'] = $positionScore * $imgSizeScore * $faceSizeScore;
}
// Sort previews by score descending