It makes use of grads information of the different gray. It has good stability.
同时它利用了不同灰度值象素的梯度信息，具有较好的稳定性。
Histogram character is not affected by object figures variance and scale, and it has good stability.
直方图特征不受目标的外形和比例变化的影响，具有较好的稳定性。
Histogram character is not affected by object figure's variance and scale, and it has good stability.
直方图特征不受目标的外形和比例变化的影响，具有较好的稳定性。
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