An enhancement algorithm for low signal noise ratio of point pixel

Both the spatial or time domain processing all have certain limitations by using only the partial information of the target. Therefore, this paper proposes an enhancement algorithm for low signal noise ratio point pixel based on time and spatial correlation. First, the improved Top-hat transform is used for image spatial processing, and then the wavelet transform, which has a good advantage of frequency analysis into the image, is introduced into the time domain processing. Finally, the joint probability distribution is adopted to integrate gray image obtained by the two processing methods. The experimental results show that the average grey value and SNR gain of target are enhanced effectively after enhancement.