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US 6,445,870 B1Granted
Image compression and expansion device
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorNobuaki Abe
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AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorNobuaki Abe
Estimating the term…
The image compression and expansion device handles pixel data (R, G, B) which are generated according to the 256-color mode. The pixel data are compressed and recorded in a recording medium. Palette information, composed of color data of the 256-color mode, are converted to data which are conformed to a predetermined format, and are recorded in the recording medium. The compressed image data and the palette information, which are recorded in the recording medium, are read therefrom, so that the compressed image data are expanded to reproduce the pixel data. In this expansion process, based on the reproduced pixel data, color data, which correspond to the pixel data and are contained in the palette information, are selected.
An image expansion device that expands compressed image date recorded in a recording medium, in which palette information representing predetermined color data formed by combining a red (R) component, a green (G) component and a blue (B) component, is also recorded, said palette information comprising a color generation table representing variations of colors for each pixel in an uncompressed image, said image expansion device comprising:
An image expansion device that expands compressed image data recorded in a recording medium, in which palette information composed of a predetermined number of color data formed by combining a red (R) component, a green (G) component and a blue (B) component, is also recorded, said image expansion device comprising:
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Using pulse code modulation: codec means
Systems for the transmission or the storage of the colour picture signal; Details therefor, e.g. coding or decoding means therefor: using a…
Between a recording apparatus and a television camera: the recording apparatus and the television camera being placed in the same enclosure
Circuits for processing colour signals: multi-purpose receivers, e.g. for auxiliary information
Term ended 17 Oct 2017 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention is related to a device which compresses color still image data, for example, in accordance with a JPEG (Joint Photographic Expert Group) algorithm, and records the compressed image data in a recording medium and, also, to a device which reads the compressed image data from the recording medium and expands the compressed image data to reproduce the color still image.
2. Description of the Related Art
The present invention will be better understood from the description of the preferred embodiments of the invention set forth below, together with the accompanying drawings, in which:
FIG. 1 is a block diagram showing an image compression device of an embodiment of the present invention;
FIG. 2 is a view showing an example of palette information;
The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 is a block diagram of an image compression device of an embodiment of the present invention, by which luminance signals (Y data) and color difference signals (Cb data and Cr data), which correspond to an original color still image, are compressed according to the JPEG algorithm.
Light reflected from a subject S passes through an imaging optical system 11 and enters a dichroic prism 12, so that the light is color-separated into a red (R) light component, a green (G) light component and a blue (B) light component. These light components exit from emergent planes 12R, 12G and 12B, respectively, so that an R image, a G image and a B image, which correspond to a single object image, are formed on the light receiving surfaces of the CCDs (charge coupled device) 13R, 13G and 13B, respectively.