Title:
DYNAMIC RANGE COMPRESSION OF OUTPUT CHANNEL DATA OF AN IMAGE SENSOR
Document Type and Number:
WIPO Patent Application WO2003053038
Kind Code:
A3
Abstract:
A method (S100) for dynamic range compression of output channel data from an image sensor (2) comprising an array of sensor cells. The method (S100) comprises selecting a window (S130) in the channel data, the window having a reference pixel value and a plurality of nearby pixel values. The reference pixel value originates from a reference cell that is one of the sensor cells and the nearby pixel values originate from the sensor cells that are in close proximity to the reference cell. There is a step of multiplying (S140) the pixel values, in the window, by a respective weight value to provide weighted pixel values and then adding (S150) the weighted pixel values to provide a convolution value. Thereafter, there is a step of providing (S160) a dynamic range compression value for the window from a selected one of the pixel values and said convolution value and then an assigning step (S170) assigns the dynamic range compression value to a selected pixel location comprising part of an image.
Inventors:
HAMMADOU TARIK
Application Number:
PCT/US2002/037844
Publication Date:
October 06, 2005
Filing Date:
November 25, 2002
Export Citation:
Assignee:
MOTOROLA INC (US)
International Classes:
G06T5/00; (IPC1-7): H04N9/07; H04N3/14; H04N1/46; G06K9/00
Foreign References:
| US6388706B1 | 2002-05-14 | |||
| US6424753B1 | 2002-07-23 | |||
| US6526181B1 | 2003-02-25 |
Download PDF: