Patent ID: 6388664
Filing Date: 2002-05-14
Classification: G06T

Abstract:
A method for displaying a road map mesh in a form of bird's eye view on a display screen of a display unit, comprising:a) storing the road map mesh in a form of a plan view; b) placing a virtual viewpoint at an upper sky behind a predetermined point of display reference on the plan view formed road map mesh by a predetermined distance; c) looking down from the virtual viewpoint at the plan view formed road map mesh forward away from the predetermined point of display reference having an angle of field of view with respect to the predetermined point of display reference; d) setting the display screen on a plane perpendicular to a line of sight passing the viewpoint and the predetermined point of display reference on the plan view formed road map mesh to form a looking down angle to the plan view formed road map mesh; e) predefining a dot pattern representing a correspondent relationship between the pixels of the plan view formed road map and those of the display image screen; f) extracting a part of the pixels of the plan view formed road map from the plan view formed road map which has the correspondent relationship of the dot pattern and simultaneously omitting the other part of the pixels thereof from the same plan view formed road to enable the display of only a bird's eye view display region in the plan view formed road map mesh on the display screen; and g) displaying the extracted pixels of the plan view formed road map mash on the display screen during moving of the virtual viewpoint according to a scrolling process.