Integrating the concepts and theories of CSCW with the idea of distributed processing, a three-hierarchized structure is established and concurrency control and SVG are discussed in detail.

As an XML based network vector graphics format, SVG has many advantages and nicer prospects over other graphics formats.

New methods are proposed on how to convert raster and vector im-ages of AutoCAD, and how to get the vector image from raster image and exchange vector image into raster image by virtual printer isproposed especially,by which the goal of resolving the image conversion problems efficiently and in low cost will be achieved.

Homograph matrix is introduced and presented as the image space transform model between SAR image and vector image.

Image vectorization refers to the process of inputting digitized pictures or drafts to the computer, and then getting CAD file by vectorizing the digital data.

The technique of image vectorization is widely used in the field of science and engineering, such as recognition of engineering blueprint, image compression and transmission and so on.