12-03-2015 дата публикации
Номер: US20150071354A1
Принадлежит:
To use both intraframe prediction coding and interframe prediction coding, and at the same time restrict a transfer volume of reference data used in motion detection in interframe prediction coding. In a coding apparatus that compression-codes moving images, both intraframe prediction coding and interframe prediction coding are applied and prediction coding is carried out using a prediction image produced by the coding system deemed to have the higher coding efficiency. 111.-. (canceled)12. An image coding apparatus that codes a moving image frame in units of blocks , comprising:an conversion unit configured to reduce a number of gradations of a moving image frame to generate a gradation-reduced-image-frame;an intraframe prediction unit configured to generate a first prediction image block for a target block in a moving image frame, based on another block within the moving image frame that includes the target block;a detection unit configured to detect motion based on a plurality of the gradation-reduced-image-frames generated by the conversion unit;an interframe prediction unit configured to generate a second prediction image block for the target block, based on another block, which is determined according to the detected motion and is within a moving image frame other than the moving image frame that includes the target block;a selection unit configured to select one of the first prediction image block generated by the intraframe prediction unit and the second prediction image block generated by the interframe prediction unit in accordance with a predetermined evaluation method; anda coding unit configured to code the target block by using the selected prediction image block selected by the selection unit.13. The image coding apparatus according to claim 12 , wherein the conversion unit comprises:an extraction unit configured to extract high frequency component data of the moving image frame; anda generation unit configured to generate the gradation-reduced-image- ...
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