Comparison about visual evoked potential through stimulation with checkerboard and square-wave grating in amblyopia children;

The development of perimeter control of the checkerboard involved in structure topology optimization of multiphase materials is presented.

The checkerboard is usually used as a target in camera calibration,and the extraction of corners extracting is important.

In order to remove the checkerboard patterns in an optimized topology solution,wavelet transform and cubic spline interpolation are combined to perform the topology extraction of a compliant mechanism.

We project the checkerboard pattern, and capture by camera to get the geometric information feedback.

Based on analysis of the properties of traffic accident scene,a new method of camera calibration using X-corners patterns is proposed.

In order to do online calibration for blurred image,we propose a new algorithm for X-corner detection based on the special character of X-corners: the pattern is symmetrical and the gray contrast greaty with each other In the algorithm the operator SV is designed to recognize X-corners which consists of symmetry operator S and variance operator V.

Based on analysis of the properties of traffic accident scene, a new method of camera calibration with X-corners patterns was proposed .

A kind of high ordered checkerboard pattern suppressing algorithm of progressive optimization method;

A new method using nodal density as design variable of continuum topology optimization was proposed to resolve the checkerboard pattern.

A well-known error is the checkerboard pattern that occurs because of the artificial high stiffness and certain elements in the optimal process whose stability are not guarantee.