IMAGE PROCESSING DEVICE, IMAGE PROCESSING PROGRAM, AND IMAGE PROCESSING METHOD

To determine that it is appropriate to perform index color processing in which input image data is subjected to color reduction processing and then compression processing using a lossless compression method, or full-color processing in which input image data is compressed using a lossy compression m...

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Bibliographic Details
Main Authors TAKASHIMA MASAHIKO, MATSUOKA TERUHIKO, YOSHIDA AKITO
Format Patent
LanguageEnglish
Japanese
Published 15.09.2022
Subjects
CALCULATING
COMPUTING
CORRECTION OF TYPOGRAPHICAL ERRORS
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
LINING MACHINES
PERFORMING OPERATIONS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
PRINTING
SELECTIVE PRINTING MECHANISMS
STAMPS
TRANSPORTING
TYPEWRITERS
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Summary:To determine that it is appropriate to perform index color processing in which input image data is subjected to color reduction processing and then compression processing using a lossless compression method, or full-color processing in which input image data is compressed using a lossy compression method without color reduction processing in order to reduce the amount of data while suppressing deterioration in image quality.SOLUTION: A multifunction machine (10) according to the present invention includes a color number conversion determination unit 200. The color number conversion determination unit 200 determines whether it is appropriate to perform indexed color processing or full color processing on the basis of the degree of color distribution, which is the degree of distribution of the pixel values of each pixel data included in input image data Dj, and a ratio of photographic area pixel data constituting a photographic area to the pixel data, and a color uniform area ratio which is the ratio of white background area pixel data that constitutes a white background area to the pixel data.SELECTED DRAWING: Figure 4 【課題】 画質の劣化を抑えつつ、データ量を低減することを意図して、入力画像データに減色処理を施した上で可逆圧縮方式による圧縮処理を施す言わばインデックスカラー処理と、入力画像データに減色処理を施さずに非可逆圧縮方式による圧縮処理を施す言わばフルカラー処理と、のいずれを実行するのが適当であるのかを、適切に判定する。【解決手段】 本発明に係る複合機（１０）は、色数変換判定部２００を有する。この色数変換判定部２００は、入力画像データＤｊに含まれるそれぞれの画素データの画素値の分布度合である色分布度合と、当該画素データのうち写真領域を構成する写真領域画素データの割合である写真領域率と、当該画素データのうちの白下地領域を構成する白下地領域画素データの割合である色均一領域率と、に基づいて、インデックスカラー処理およびフルカラー処理のいずれを実行するのが適当であるのかを、判定する。【選択図】 図４
Bibliography:Application Number: JP20210034957