Image compression and expansion device using pixel offset
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorNobuaki Abe
Life of this patent
Estimating the term…
Abstract
The image compression and expansion device handles red (R), green (G) and blue (B) image data, which are offset horizontally to each other by one-third of one pixel, for example. The R, G and B image data are converted to a luminance signal and color difference signals, which are compressed according to the JPEG algorithm to generate compressed image data. The compressed image data are then recorded in a recording medium. Offset information, indicating that the R, G and B image data are offset to each other, is converted to a predetermined format, and is also recorded in the recording medium.
Claims9
An image compression device, comprising:
- a plurality of image devices that generate a plurality of image data based on a single image, such that each of the plurality of image data is at a lower resolution than the single image;
- a pixel data input processor that inputs pixel data contained in said plurality of image data to said image compression device, said plurality of image data being offset with respect to each other;
- a compressed image recording processor that compresses said pixel data, while said plurality of image data remain offset to each other to obtain compressed image data, and records said compressed image, data in a recording medium prior to processing to obtain a high definition image wherein the high definition image is at a resolution greater than each of said plurality of image data;
- and
- an offset information recording processor that records offset information, indicating that said plurality of image data are offset with respect to each other, in said recording medium.
An image expansion device which expands compressed image data recorded in a recording medium, in which offset information is also recorded, said device comprising:
- an image reading processor that reads said compressed image data from said recording medium;
- an information reading processor that reads said offset information from said recording medium;
- a pixel data reproducing processor that expands said compressed image data to reproduce a plurality of pixel data corresponding to a plurality of image data, each of said plurality of pixel data being offset with respect to each other, wherein said plurality of image data represents a single image, such that each of the plurality of image data is at a lower resolution than the single image;
- and
- an image generating processor that processes the reproduced plurality of pixel data, which are offset with respect to each other, and removes the offset, so that one high definition image corresponding to said plurality of image data is obtained, the high definition image having a resolution greater than a resolution of each of the plurality of image data.
An image expansion device which expands compressed image data recorded in a recording medium, in which offset information is also recorded, said device comprising:
- an image reading processor that reads said compressed image data from said recording medium;
- an information reading processor that reads said offset information from said recording medium;
- a signal reproducing processor that expands said compressed image data to reproduce a luminance signal and a color differential signal;
- and
- an image data reproducing processor that reproduces a plurality of image data, said plurality of image data representing a single image, such that each of said plurality of image data is at a lower resolution than the single image, and comprising red image data, green image data and blue image data, each of which are offset with respect to each other, based on said luminance signal and said color differential signal;
- and
- an image generating processor that processes the reproduced plurality of image data, each of which are offset with respect to each other, and removes the offset, so that one high definition image corresponding to said plurality of image data is obtained, the high definition image having a resolution greater than a resolution of each of the plurality of image data.
Dependencies are inferred from the claim text.