Patent · US Active

Image processing apparatus

US11188779B2 · kind B2 · utility

1Cited by

4References

17Claims

0Family size

Assignee

I.R.I.S · BE

Inventors

Brecht Milis · Lier, BE
Michel Dauw · Machelen, BE
Frederic Collet · Etterbeek, BE

Key dates

Filing date	Mar 4, 2019
Grant date	Nov 30, 2021
Priority date	—
Expiry date	Aug 26, 2039

Classification

Technology area (CPC G)Physics
CPC primaryG06V2201/01
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Processing a dithered image comprising a grid of pixels including defining an array of pixels corresponding to a sub-region of the image; performing edge detection along the rows and the columns of the array; counting the number of edges detected along the rows of the array to determine the number of horizontal edges in the array; counting the number of edges detected along the columns of the array to determine the number of vertical edges in the array; identifying whether the sub-region is dithered based on the number of horizontal and vertical edges in the array; and selectively processing the corresponding sub-region of the image based on whether or not the sub-region is identified to be dithered. The identification step may also be based on the lengths of segments of similar pixels in the lines of the array.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.