Histogram generation apparatus and method for operating the same
US7551776B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2004 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Jan 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4074
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Histogram circuitry is provided to increment a tonal value tally corresponding to received pixel data without immediately writing the incremented tally back to a histogram table within a main memory. Instead, the tonal value and corresponding incremented tonal value tally are stored in a temporary memory of the histogram circuitry. Since received pixel data has a high likelihood of having the same tonal value as recently received pixel data, the tonal value of the received pixel data is first checked for a match with one of the recently received tonal values stored in the temporary memory. If the received tonal value is present in the temporary memory, there is no need to access the histogram table within the main memory to retrieve the corresponding tally. The tally corresponding to the received tonal value can simply be incremented in the temporary memory of the histogram circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.