Importance

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Abstract

A display device and process used to display an image in which stationary objects and moving objects are displayed on a two-dimensional surface taking into consideration the depth relationship among the objects. By using the depth relationship among objects, moving objects may be seen to move in front of other objects and thereby obscure them or move behind other objects and thereby be obscured by them. This is accomplished by using prestored image data of the stationary objects and moving objects. A depth relationship relative to another moving object and stationary object is then obtained for each of portion of the prestored image data for each moving object for which a change has occurred between frames. The present invention uses an object buffer to expand difference data representing a difference between frames of prestored image data of a moving object. A bit map is used to contain bits uniquely assigned to each moving object. An overlay buffer sets and resets the bits assigned to the moving object in accordance with change lists generated from the difference data. A frame buffer is used to map pixel data for one frame in accordance with the results of the bit setting and resetting function of the overlay buffer for all moving objects in the overlay buffer.

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First Claim