By using the image processing function and programming tomography,the following functions are realized: the contour line,edge line and gradation histogram of medical images are displayed;the selected regions of medical images are freely zoomed;the gray level of discretional regions is displayed using medical image processing tool and the distance of the given points is freely measured.

This paper simulates the image s gray level histogram with a series of Gaussian functions, and calculates the optimal thresholds between different neighboring Gaussian functions, and then separates the needed area from the whole image.

In this paper, adaptive oriented orthogonal projective decomposition is used to decompose the gray level histogram of image with complex background into the combination of several Gauss density functions.

The threshold methods of image segmentation are surveyed in this article, especially those based on the gray level histogram.

Extraction and analysis of mineral information in gray histogram of sinter ore mineragraphy;

Superposition principle of gray histograms in video analysis

Methods : The gray histogram of the image was drawn,and then the threshold was found.

A new automatic exposure algorithm using luminance histogram of an image is proposed.