Two-pass image processing method and apparatus using virtual estimation for compressed file size
US5937100A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1997 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Feb 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing method and an image processing apparatus in which a DCT section transforms image data to a frequency conversion coefficient using a discrete cosine transform coefficient, a quantizing section quantizes the transformed frequency conversion coefficient using a quantization coefficient indicating weighing in quantization, a Huffman encoding section encodes the quantized data, and a CPU detects a code rate for encoded data by a prespecified time interval during execution of processing for encoding the data quantized by the encoding means and changes the quantization coefficient during processing for encoding according to the detected code rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.