空间直方图融合了目标的颜色信息和颜色的空间分布信息，比传统的颜色直方图更具有目标鉴别能力。
Spatiograms outperform the traditional color histogram, which contain color information and spatial layout of these colors for the target.
该方法首先将原始图像变换到CIELAB颜色空间，然后对所得图像的L和a分量分别进行直方图统计。
Firstly, it turns the original image into CIELAB color space, then computes histograms of L and a separately.
色调和饱和度的投影直方图反映了颜色的空间分布，而亮度的投影直方图则体现了图像的形状。
The projective histograms of hue and saturation discribe the color distribution in space, and the projective histogram of intensity reflects the shape of the image.
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