Title:
METHODS AND APPARATUS FOR AUTOMATIC EXPOSURE CONTROL
Document Type and Number:
WIPO Patent Application WO2002029707
Kind Code:
A9
Abstract:
A multi-dimensional imaging device and method for automated exposure control that implement two distinct modules to control the exposure and gain settings in the imager so that processing can occur in a mult-tasking single CPU environment. The first module, referred to herein as the imager control module, controls the exposure and gain settings in the imager. The first module is typically implemented in a high priority routine, such as an interrupt service routine, to insure that module is executed on every captured frame. The second module, referred to herein as the histogram processing module, calculates a target contrast (the product of the targeted exposure and gain settings) based on feedback data from the first module and image data from memory. The second module is typically implemented in a low priority routine, such as a task level routine, to allow for the routine to be executed systematically in accordance with priority.
Inventors:
HARPER JEFFREY D (US)
HUSSEY ROBERT M (US)
PANKOW MATTHEW W (US)
MEIER TIMOTHY P (US)
HUSSEY ROBERT M (US)
PANKOW MATTHEW W (US)
MEIER TIMOTHY P (US)
Application Number:
PCT/US2001/030605
Publication Date:
February 20, 2003
Filing Date:
September 28, 2001
Export Citation:
Assignee:
HAND HELD PROD INC (US)
HARPER JEFFREY D (US)
HUSSEY ROBERT M (US)
PANKOW MATTHEW W (US)
MEIER TIMOTHY P (US)
HARPER JEFFREY D (US)
HUSSEY ROBERT M (US)
PANKOW MATTHEW W (US)
MEIER TIMOTHY P (US)
International Classes:
G06K7/10; G03B7/28; G06K9/00; H04N5/235; H04N5/351; (IPC1-7): G06K7/10
Download PDF:
Previous Patent: ELECTRONIC BAR CODE DEFINED BY POLYMER PRINTING PROCESS
Next Patent: WIRELESS REMOTE ORDERING DEVICE
Next Patent: WIRELESS REMOTE ORDERING DEVICE