| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image-coding method which outputs image data and an alpha channel in a single file form for compressing and coding an image and the alpha channel accompanying therewith, and takes out an alpha channel corresponding to a reduced image, without converting the resolution for further taking out reduced image data of low resolutions therefrom lower than a fixed value. <P>SOLUTION: The image coding method of compressing and coding input image data, composed of a plurality of components comprises a step of adding an alpha channel having mask information recorded per pixel for forming a composite image to the input image data as a new component, coding image data, containing a plurality of components and the new component after converting the resolutions thereof in an hierarchical form, thereby forming an integrated image file. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
