如果一个光源照亮某一个地方，这个地方距离光源越远，光照强度会越弱，但是光照强度并不是与光源距离等比例地减弱，就是说，距离延长两倍，光照强度并不是减弱两倍，而是减弱两倍的两倍，等于减弱四倍；

If a light illuminates a certain space, its intensity at twice the distance is not twice as feeble, but two times two, equal four times, as feeble.

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与传统方法相比，由于利用了色彩曲线的变化比例的差分思想，克服大部分光照缓慢变化引起的噪声问题，达到实时检测定位的目的。

This method uses advanced processing technique and the variety of color curve to figure out the moving object, resolve the problem that illumination cause and realize the realtime rough detection.

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接受光照疗法的患者中，有57%的人症状得到了改善；而接受日出模拟治疗的患者，症状得到改善的人数比例是50%。

Improvement was seen in 57 percent of subjects in the bright light therapy, and 50 percent of those in the dawn simulation group.

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