Patent ID: 6956583
Filing Date: 2005-10-18
Classification: G09G

Abstract:
1. An error diffusion apparatus, comprising: a boundary region recognition unit for recognizing boundaries of displayed regions by a single scalar RGB (red, green, blue) input signal; and an error diffusion processing unit for outputting a single scalar RGB output signal by performing at least one of computing an error value between a present pixel and surrounding pixels based on the recognized boundaries and outputting a single scalar RGB output signal by computing an error value of the present pixel based on the recognized boundaries, the error value of the present pixel computed regardless of an error of the surrounding pixels, wherein the boundary region recognition unit enables or disables operation of a boundary region recognition signal corresponding to the recognized boundaries, wherein the boundary region recognition unit compares a ratio R:G:B of the present pixel with a ratio R:G:B of the surrounding pixel and one of enables and disables the operation of the boundary region recognition signal according to whether a comparison value exceeds a ratio tolerance set by a user, and wherein the boundary region recognition unit receives an absolute gray-level value of the present pixel from the RGB input signal and an absolute gray-level value of the surrounding pixel, compares them, and one of enables or and disables the operation of the boundary region recognition signal according to a comparison result whether a comparison value exceeds a gray-level tolerance set by a user.