Method for preparing compressed image data file, image data compression device, and photographic device
US7477796B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2006 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Apr 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for carrying out a step of extracting a portion of a predetermined size from the image data, and a step of preparing a predetermined number of compressed partial data compressed with different compression parameter values by repeating preparation of compressed partial data by compressing the partial data in predetermined format for the predetermined number of times with the compression parameter value used in the predetermined format changed for each compression, on the entire image data. The method also calculates the total of the data sizes of all of the compressed partial data compressed with the same compression parameter value for each of the compression parameter values and prepares the compressed image data file from compressed partial data compressed with a compression parameter value for which the total is not larger than a given threshold and which is the closest value to the threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.