Virtual inclined algorithm on horizontal plane screen

To maintain a comfortable position for people who watches a horizontal plane screen,a virtual inclined algorithm of horizontal plane screen is proposed.According to the projection relationship between the inclined plane and the horizontal plane screen,the upper-placed method and the under-placed method are given and their virtual algorithms are deduced respectively.The comparison of the advantages and disadvantages between these two algorithms indicates:people can maintain a fixed position but the size of the screen must be big while using the upper-placed method;people have to change their position but the screen can be smaller while using the under-placed method.Finally,the two algorithms are proved to be feasible and reliable by specific experiment.