Image read device and image read method

Abstract

An image reading apparatus includes a transport path for guiding an original from an original tray to a reading position; a transport device for transporting the original toward a downstream side in a forward direction or toward an upstream side in a reverse direction; a reading device for reading the original at the reading position; a determining device for determining whether the original has a black and white image or color image; and a retreat path disposed at an upstream side of the reading position for retreating at least a part of the original from the transport path. After the determining device determines the original, the original is transported in the reverse direction to retreat it to the retreat path. Then, the original is transported to the reading position, so that the reading device reads the original in a reading mode according to a result of the determination.

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, the number of image reading devices has also increased, and in the past, it has been required to read color manuscripts at a higher speed and more accurately. [0003] However, when an im...

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Problems solved by technology

[0003] However, when an image reading device performs reading processing on a manuscript having a color manuscript, it is generally necessary to perform image processing for each of the three primary colors of light, red (R), green (G), and blue (B). The data is read. Therefore, to read a manuscript with a color image at the same resolution as that of a black-and-white image, at this time, it is necessary to slow down its reading speed

[0004] On the other hand, there is a situation 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 is reduced when

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