A method for generating bird's-eye view images without color loss

Abstract

The invention provides a generation method of an aerial view without color loss. The generation method comprises the following steps: (1) traversing all primitives in a path graph, and obtaining a key primitive set which can not be extracted and a non key primitive set which can be extracted; (2) zooming out all primitives in the key primitive set which can not be extracted and the non key primitive set which can be extracted according to a reduced scale, and zooming out the primitives according to a set ratio threshold value when the reduced primitives in the key primitive set are not allowed to zoom out according to the current reduced scale; and (3) calculating the relative positions of the primitives, which are zoomed out, in the key primitive set and the non key primitive set in a thumbnail, regulating the relative positions, and drawing the primitives on an aerial view template according to the relative positions. The generation method compares a pixel value of the key primitive to retain the pixel of the key primitive in a thumbnail process, the loss of the key primitive can be effectively reduced, and distortion is reduced.

Description

technical field [0001] The invention relates to a graphic thumbnail method, in particular to a method for generating a bird's-eye view without color loss. Background technique [0002] The bird's eye view is a thumbnail image generated according to a certain ratio of the circuit diagram. When the thumbnail ratio is not large, it usually does not cause image distortion and loss of grouting pixels, but if the thumbnail ratio is large, it is easy to cause critical The loss of pixels will cause image distortion, especially when the circuit diagram is abbreviated, if the key pixels such as lines and stations are lost, it will cause errors in the abbreviated circuit diagram. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for abbreviating circuit diagrams without color loss and distortion, so as to solve the problems in the prior art. [0004] In order to solve the problems of the technologies described above...

AI Technical Summary

Problems solved by technology

[0002] The bird's eye view is a thumbnail image generated according to a certain ratio of the circuit diagram. When the thumbnail ratio is not large, it usually does not cause image distortion and loss of grouting pixels, but if the thumbnail ratio is large, it is easy to cause critical The loss of pixels will cause image distortion, especially when the circuit diagram is abbreviated, if the key pixels such as lines and stations are lost, it will cause errors in the abbreviated circuit diagram