Video encoding method and apparatus for estimating a code amount based on bit string length and symbol occurrence frequency
US9210435B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2012 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Feb 12, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video encoding apparatus includes a frequency transform unit for executing an orthogonal transform on a prediction difference or an original image; a quantizing unit for quantizing transform coefficients outputted by the frequency transform unit; a variable-length coder for executing variable-length encoding on a bit string generated from the quantized transform coefficients; a rate controller for performing a rate control to control a code bit stream outputted by the variable-length coder to be maintained at a bit rate; and a code amount estimating unit for estimating a code amount to be generated by the variable-length coder based on a length of the bit string and an occurrence frequency of symbol in the bit string. The rate controller executes the rate control based on the estimated code amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.