Considering the shortage of the traditional image enhancement algorithms that it can only use space-domain or transform-domain processing strategy separately,a novel processing method combining space domain with transform domain was proposed.Firstly,the original gray images were decomposed into different frequency bands by using Gaussian/Laplacian pyramid transform.Secondly,gamma correction was employed to achieve contrast equalization in each band.Finally,the enhanced images were reconstructed from the equalized one by means of inverse pyramid transform.Experimental results indicated that:Compared with traditional image enhancement algorithms,the proposed one can not only increase the contrast of underexposure regions,but also effectively suppress the luminance of overexposure regions,and achieve a good visual balance.