Image decompressing apparatus with efficient image data transfer
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsAkihiko Takabatake, Shinichi Uramoto, Takashi Hashimoto
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Abstract
A synchronous semiconductor memory device is utilized as an image data storage memory, and at most two pixels as one word are alternately stored in first and second banks of the synchronous semiconductor memory device. Respective pixel data of two types of color-difference signals as to the same pixel are stored in the same address position of the banks of the synchronous semiconductor memory device. Necessary data can be transferred by the burst length of the synchronous semiconductor memory device while suppressing overhead of page change to the minimum by alternately accessing the first and second banks.
Claims19
An image decoding apparatus for restoring original image data from coded image data including a plurality of sampled pixel data, comprising:
- a synchronous memory device including a plurality of banks each being capable of performing memory cell selecting operations independently of others for inputting or outputting data in synchronization with a clock signal;
- decoding means for receiving sampled pixel data included in said coded image data and performing a prescribed decoding processing for restoring said original image data;
- and
- control means for storing the image data restored by said decoding means in said synchronous memory device, said control means including means for writing pixel data included in said image data from said decoding means in said synchronous memory device such that sampled pixel data aligned with each other on an image screen in a horizontal direction as to a first signal component are cyclically stored in said plurality of banks in a unit of a prescribed number of horizontally adjacent pixels, said prescribed number being no greater than two.
An image decoding apparatus for restoring original image data from sampled, coded image data, comprising:
- a synchronous memory device including banks being capable of performing memory cell selecting operations independently of each other for inputting or outputting data in synchronization with a clock signal;
- decoding means for receiving sampled pixel data being included in said coded image data and performing a prescribed decoding processing for restoring said original image data, the image data including first and second signal components of different types having a common sample number;
- and
- control means for storing the image data restored by said decoding means in said synchronous memory device, said control means including means for writing the sampled image data included in the restored image data in said synchronous memory device so as to store first and second signal components of a same common sampled pixel in a same common address position of first and second banks of said plurality of banks respectively.
Dependencies are inferred from the claim text.