Abstract:

Dynamic threshold attenuation characteristics and firing periodicity of spiking cortical model (SCM) are analyzed. It is concluded that the negative time matrix of this model conforms to Weber-Fechner-law. It processes lighter areas coarsely and darker areas accurately. And then a new image enhancement algorithm based on SCM is presented. The hue saturation intensity (HSI) color space that satisfies with human visual system is chosen. Hue component is kept unchanged; but saturation component is changed by power stretch while luminance component is processed by SCM. Experiment shows that this algorithm is feasible, and the enhancement effect is obvious.

Key words: color image enhancement, spiking cortical model, time matrix, human visual characteristics