Patent · US Active

Adaptive automatic exposure apparatus and method for digital images

US8743235B2 · kind B2 · utility

2Cited by

14References

23Claims

0Family size

Assignee

The Board of Regents of the University of Texas System · US

Inventors

Nasser Kehtarnavaz · Plano, US
Mohammad Rahman · Dallas, US

Key dates

Filing date	Nov 4, 2010
Grant date	Jun 3, 2014
Priority date	—
Expiry date	Jul 4, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH04N23/70
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An apparatus and method for automatically adjusting an exposure for a digital imaging device by (a) receiving a current image frame using an exposure value (EV), (b) computing a current image spatial entropy (ISE) for the current image frame, and (c) whenever the current ISE is greater than a previous ISE, setting the previous ISE equal to the current ISE, increasing the EV, and repeating steps (a) and (b), and (d) whenever the current ISE is less than or equal to the previous ISE, decreasing the EV, receiving the current image frame using the EV, and displaying the current image frame.

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