Low-contrast character image enhancement method

The invention discloses a low-contrast character image enhancement method, which is used for realizing low-contrast character image enhancement and comprises the following steps: 1, carrying out wavelet decomposition on a character image; 2, performing Gamma correction on a low-frequency component of the character image; 3, filtering the high-frequency component median of the character image; 4, reconstructing each component image of the character image; and 5, carrying out secondary median filtering on the reconstructed character image. According to the method, the image is decomposed into a high-frequency part containing noise and a low-frequency part containing main information through wavelet transform, the contrast ratio of the low-frequency part is improved through Gamma correction, salt and pepper noise existing in the high-frequency part is filtered out through median filtering, all components are subjected to wavelet reconstruction, and a new image is obtained; the enhancement of the low-contrast cha