| 发明名称 | Image compression | ||
| 摘要 | Disclosed is a method of compressing an image to be stored in a memory to satisfy a memory requirement. A size of a region having a uniform colour in the image is determined. The determined size of the region is compared with the candidate values of the region size threshold. A value is selected from the candidate values as the region size threshold based on the comparison between the estimated data amounts to satisfy the region size threshold and the memory requirement. The edges constituting the region which satisfy the selected value of the region size threshold are compressed losslessly. | ||
| 申请公布号 | US8983185(B2) | 申请公布日期 | 2015.03.17 |
| 申请号 | US201313828710 | 申请日期 | 2013.03.14 |
| 申请人 | Canon Kabushiki Kaisha | 发明人 | Deng Dixon De Sheng;Lu Wen Tao |
| 分类号 | G06K9/36;G06T9/00 | 主分类号 | G06K9/36 |
| 代理机构 | Canon U.S.A., Inc. IP Division | 代理人 | Canon U.S.A., Inc. IP Division |
| 主权项 | 1. A method of compressing an image to be stored in a memory to satisfy a memory requirement, executed by at least one processor, said method comprising the steps of: determining a size of a region in the image, the region having a uniform colour; obtaining candidate values of a region size threshold; comparing the determined size of the region with at least one of the candidate values of the region size threshold; estimating data amounts to encode edges constituting the region which satisfy the at least one of the candidate values of the region size threshold; selecting a value from the candidate values as the region size threshold based on the comparison between the estimated data amounts and the memory requirement; compressing losslessly edges constituting the region which satisfy the selected value of the region size threshold; and compressing lossily image data in a region other than the region to be compressed losslessly. | ||
| 地址 | Tokyo JP | ||