Image read device, its read method and draft transfer device

Abstract

An image reading apparatus includes a transport path for transporting an original from an original tray to a reading position; a reading device for reading the original at a reading position; a determining device for determining whether the original includes a black and white image or color image; a circulating path for returning the original to the reading position without turning over the original; a discharge path for guiding the original from the reading position to a discharge tray; and selection means for selecting one of the circulating path and the discharge path. The image reading apparatus reads the same side of the original fed from the circulating path again according to a result of the determining device.

Description

technical field [0001] The present invention relates to an image reading device and an image reading method provided with an automatic document feeder (ADF) for reading a document conveyed on a platen. An image reading device and an image reading method for recognizing a manuscript with a black and white image or at least a part of a manuscript with a color image, and performing a reading process on the image of the manuscript according to the recognition result. Background technique [0002] In recent years, with the popularization of personal computers capable of color drawing, the Internet, electronic photographs, etc., there has been an increasing demand for color images that are more expressive than black-and-white images to be copied, printed, or transmitted as they are. As a result, image reading devices have also increased in the past, and it is required to read color manuscripts at a higher speed and more accurately. [0003] However, when an image reading device r...

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Problems solved by technology

[0003] However, when an image reading device reads a color manuscript, it is usually necessary to read the image data for each of the three primary colors of light, red (R), green (G), and blue (B). As a result, color manuscripts must be read at the same resolution as black-and-white image reading processing. In this case, the reading speed must be reduced compared with the reading processing of black-and-white manuscripts.

[0004] On the other hand, there are cases where black-and-white manuscripts and color manuscripts are mixed in the manuscripts read by the image reading device. In such a case, if the reading process is uniformly performed in the color mode, the reading of the black-and-white manuscripts will be difficult. The read speed of the

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