Symbol separation is a key step of the automatic input of topographic map.

Based on this vectorization algorithm this paper presents a symbol extraction approach which can extract all kinds of isolated and adhered together symbols effectively.

A Declining License Character Extraction Method;

Through studying the mathematical morphology thoroughly,a novel license plate character extraction algorithm for the gray image is proposed.

First,at the stage of character extraction,the approach of color extraction is used for extracting characters when the characters color is as same as background but has difference in brightness.

The key technologies of drawing automatic input and management system (DAIMS) for engineering drawings are presented, including the variable grid adaptive thresholding method for uneven drawing, the algorithm of text string extracting and the algorithem of primitive interactive picking, etc.

The image extraction system of light section microscope is reformed.

The leaf image extraction was a key step of modeling plant organs and living plant recognition,and had important value in the fields of automatic identification of plant and modeling.