Shadow detection and removal is an important task when dealing with colour outdoor images. Shadows are generated by a local and relative absence of light. Shadows are, first of all, a local decrease in the amount of light that reaches a surface.

This paper is concerned with the derivation of a progression of shadow-free image representations. First we show that adopting certain assumptions about lights and cameras leads to a 1-d, grey-scale image representation which is illuminant inva

利用小波变换逼近信号滤除心电图(ECG)基线漂移的方法 可以完成图像的光线不均的矫正-The wavelet transform the approximation signal filtering electrocardiogram (ECG) baseline drift complete image uneven light correction