Firstly,the study transformed the inverse halftoning image and the original image into S-CIELab color space,by defining perception color difference and perception gradient,a quantitative index is constructed for apraising the color inverse halftoning image.

A heuristic information called grayscale grads perception is proposed and used to provide guidance to the ants with the pheromone trails together.

The self and mutual inductances are calculated by Gauss quadratic technique, After analyzing the gradients of mutual inductance are computed analytically and more accurately.

Study of rail inductance gradient during EM rail launch based on time-frequency analysis;

Effect of rail geometrical parameters on inductance gradient of EML

Augmented rail gun inductance gradient and its affecting factors