Paper reading:Global Contrast based Salient Region Detection
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- Histogram based contrast(HC)
- the saliency of a pixel is defined using its color contrast to all other pixels in the image:
where D(Ik; Ii) is the color distance metric between pixels Ik and Ii in the L∗a∗b∗space
where N is the number of pixels in image I
- the terms with the same color value cj are grouped together, we get saliency value for each color as:
上述方法的时间复杂度是0(N2),接下来对算法进行加速,可以达到0(N) - the saliency of a pixel is defined using its color contrast to all other pixels in the image:
Histogram based speed up(HC 加速)
首先将颜色RGB区间[0-255]归一化到[0-11]这12种颜色,颜色数降为123=1728种(注意是在RGB颜色空间)
考虑实际图片当中,选择高频出现的颜色(出现频率高于95%)85种,对于剩余低于5%的其他颜色用最接近的颜色替代,得到直方图。
Refine HC saliency map
为了避免上述做法可能导致本来相似的颜色量化为不同的值,对颜色做平滑,调整显著性值:
(T − D(c; ci)) 意味着颜色与c接近的对S’(c)具有更大的权重(实验发现,线性权重比用高斯权重(太尖锐)的效果更好)。
Region based Contrast (RC)
1. Segment——graph-based image segmentation
2.Region contrast
Dr( · , · ) is the color distance metric between the two regions
w(ri) is the number of pixels in ri
即对于区域c1直方图中有n1种颜色,第 i 种颜色对应的概率为f(c1 , i),D( · , · )表示Lab颜色差异值。(计算基于量化后的颜色)
- Spatially weighted region contrast (考虑空间距离)
Ds is the spatial distance between regions ;
σs controls the strength of spatial distance weighting(取较大值时,降低空间距离的影响,当像素坐标归一为[0,1]时,实验取0.4)
- Experimental Comparisons
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