| US 7,522,193 B2 | ||
| Histogram-based automatic gain control method and system for video applications | ||
| Nadi R. Itani, Austin, Tex. (US); Caiyi Wang, Austin, Tex. (US); and David R. Welland, Austin, Tex. (US) | ||
| Assigned to Cirrus Logic, Inc., Austin, Tex. (US) | ||
| Filed on Jun. 07, 2004, as Appl. No. 10/862,488. | ||
| Application 10/862488 is a division of application No. 09/075446, filed on May 08, 1998, granted, now 6,750,906. | ||
| Prior Publication US 2005/0024509 A1, Feb. 03, 2005 | ||
| Int. Cl. H04N 5/235 (2006.01); H04N 5/228 (2006.01); H04N 5/217 (2006.01) | ||
| U.S. Cl. 348—229.1 [348/222.1; 348/241] | 16 Claims |
| 1. A processing system for an imager device comprising:
a camera system for producing an imager signal;
a correlated double sample (CDS) circuit for receiving data from an imager;
said correlated double sample circuit being adapted for variable gain amplification;
an analog-to-digital converter (ADC) coupled to said CDS circuit;
a digital gain circuit (DGC) coupled to said ADC; and
histogram-based automatic gain control (AGC) circuit coupled to said DGC, effective for controlling said CDS circuit and said
DGC, wherein said histogram-based AGC circuit generates error codes with histogram bins.
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