发明授权
- 专利标题: Method and apparatus for processing image files
- 专利标题(中): 用于处理图像文件的方法和装置
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申请号: US10072245申请日: 2002-02-08
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公开(公告)号: US06741746B2公开(公告)日: 2004-05-25
- 发明人: Yoav Epstein , Kirkpatrick William Norton , Hoang Nhu
- 申请人: Yoav Epstein , Kirkpatrick William Norton , Hoang Nhu
- 主分类号: G06K936
- IPC分类号: G06K936
摘要:
A method and apparatus for manipulating digitized images stored as variable length encoded bitstreams such as JPEG format in a manner that reduces memory and processor resource requirements. A prescan means sequentially decompresses the bitstream to identify the location of encoded pixel image areas. Designated ones of these locations are recorded or stored in a prescan table. After the prescan operation has been performed on the image, image manipulations such as rotating, cropping, and zooming can be performed on a selected portion of the image by directly accessing only the encoded pixel image areas to be manipulated, without the need to sequentially decode and store all the encoded image areas in order to locate the ones of interest.
公开/授权文献
- US20020085767A1 Method and apparatus for processing image files 公开/授权日:2002-07-04