IMAGE PROCESSING APPARATUS, READING APPARATUS, IMAGE PROCESSING METHOD, AND PROGRAM

• Main Author: SANO SHINJI
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2019
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

To provide an image processing technology that performs auto color selection (ACS) with high accuracy.SOLUTION: An image processing apparatus for determining whether a read document is a color document or a monochrome document includes: pixel type determination means for determining whether a target pixel in a read image generated by scanning a document with a sensor is a color pixel or a monochrome pixel based on a luminance signal value of the target pixel; and document type determination means for determining whether the document is a color document or a monochrome document based on at least one of the number of determined color pixels and the number of determined monochrome pixels. The pixel type determination means determines that the target pixel determined to be a color pixel is a monochrome pixel when the target pixel group including the target pixel corresponds to a predetermined color arrangement pattern.SELECTED DRAWING: Figure 2 【課題】ＡＣＳ（Ａｕｔｏ Ｃｏｌｏｒ Ｓｅｌｅｃｔｉｏｎ）を高精度に行う画像処理技術を提供する。【解決手段】画像処理装置は、読み取った原稿がカラー原稿かモノクロ原稿かを判定する画像処理装置であって、センサが前記原稿を走査して生成された読取画像における注目画素の輝度信号値に基づいて当該注目画素がカラー画素かモノクロ画素かを判定する画素種別判定手段と、判定されたカラー画素の数またはモノクロ画素の数の少なくとも１つに基づいて原稿がカラー原稿かモノクロ原稿かを判定する原稿種別判定手段と、を備える。画素種別判定手段は、注目画素を含む注目画素群が所定の色配列パターンに該当する場合、カラー画素と判定された前記注目画素をモノクロ画素と判定する。【選択図】図２