IMAGE READING DEVICE, IMAGE FORMING APPARATUS, AND PROGRAM
To perform correction for a white flare phenomenon and a black flare phenomenon to more accurately read the density of a document image.SOLUTION: An image reading device irradiates a document to be photographed with illumination light and photographs the document with an image pickup device; the ima...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To perform correction for a white flare phenomenon and a black flare phenomenon to more accurately read the density of a document image.SOLUTION: An image reading device irradiates a document to be photographed with illumination light and photographs the document with an image pickup device; the image reading device corrects the influence of the density of a peripheral image on a target image area of the photographed image by correcting a read image signal of the target image area, with a cumulative operation value of a read value of the peripheral image and a first function as a coefficient, and a cumulative operation value of the read value of the peripheral image and a second function as an addition value.SELECTED DRAWING: Figure 12
【課題】白フレア現象および黒フレア現象に対する補正を行い、より高精度に原稿の画像濃度を読み取る。【解決手段】撮影対象の原稿に対して照明光を照射して撮像素子で撮影する画像読取装置において、撮影画像の注目画像領域に対する周辺画像の濃度の影響を、当該周辺画像の読取値と第１の関数との累積演算値を係数とし、前記周辺画像の読取値と第２の関数の累積演算値とを加算値として、前記注目画像領域の読取画像信号を補正する。【選択図】図１２ |
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