An approach of using genetic algorithm to search the best ring like window for extracting the feature in the ring like window is discussed in this paper.

In order to promote prediction speed,a fast intra prediction algorithm is proposed which select appropriate coding block size based on complexity of the image,use annular slide window to select prediction mode dynamically and define a simple blo.

A clipping algorithm of straight line based on circular window;

Line clipping algorithm based on a circular window is proposed in this paper.

Hexagonal grid coordinate and the relation of the circle window and the line to be clipped are demonstrated.

A new segments clipping algorithm against circle window in 2D space and3D eyecooldinate system is presented.

By using two groups of cylindrical lenses perpendicular to each other, the marking shape window of semiconductor laser is imaged and rectangle and this imagery is then collimated to infinite by collimating objective.

The key of the system is that cylindrical lenses by perpendicular double group and equal conjugate are used to image marking shape window to thick and short one.