4. Contrast analysis for extracting high-resolution
Which separates a large-scale object from its
surroundings.
Assignment of comparable saliency values to similar
image regions, and can uniformly highlight entire
objects.
Saliency of a region depends mainly on its contrast to
the nearby regions.
Saliency maps should be fast and easy to generate.
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7. CIE 1976
L*
lightness of the color
L* = 0, yields black
L* = 100, indicates diffuse white
a*
between red/magenta and green
negative values indicate green
positive values indicate magenta
b*
between yellow and blue
negative values indicate blue
positive values indicate yellow
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8. 彩色空間, n = 2563 = 16,777,216
僅用亮度, n = 256
忽略顏色訊息可區別性
通道顏色量化
自然影像顏色僅占全部色彩一小部份
丟棄頻率較小的色彩(覆蓋5%)
保留高頻色彩(覆蓋95%)
每個通道色彩量化至12個值, n = 123
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