Patent · US Active

Method and apparatus for determining a sharpness metric of an image

US10096119B2 · kind B2 · utility

0Cited by

4References

15Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Oliver Theis · Hohenhausen, DE
Axel Kochale · Springe, DE
Siegfried Schweidler · Gehrden, DE

Key dates

Filing date	Nov 25, 2016
Grant date	Oct 9, 2018
Priority date	—
Expiry date	Apr 7, 2037

Classification

Technology area (CPC G)Physics
CPC primaryG06T2207/30168
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

In order to objectively and efficiently measure, visualize and evaluate the quality of images in terms of sharpness, a method for determining a sharpness metric (S) of an image is described. The method includes performing edge detection that results in gradients for the pixels of the image, determining a value representing a contrast metric C of the image, calculating at least three different thresholds (t1,t2,t3) from the image content, and classifying the pixels according to their gradient into at least four groups defined by the thresholds. The sharpness metric (S) is calculated from relationships between the amounts of pixels in the different groups and a multiplicative factor (m) between the at least three thresholds.

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