Fast Gray-Contrast Enhancement of X-Ray Imaging for Observing Tiny Characters

Low-contrast structure can be found in many kinds of digital images, which makes the images vague and uncertainly. A kind of image enhancement processing algorithm for tiny characters is brought forward based on a no-linear grad-contrast operator. The analysis of the algorithm shows that local regions of the image are enhanced by using the concept of the grad contrast to make image clearer adaptively. Experiments were conducted on real pictures, and the results show that the algorithm is flexible and convenient.