Patent ID: 6717617
Filing Date: 2004-04-06
Classification: H04N

Abstract:
In an image reading apparatus having imaging means for outputting image signals as a plurality of color components, with each signal of the color components being divided according to even-number pixels and odd-number pixels, and having sample holding means for holding the output of said imaging means, and for reading in a color mode and for reading in a monochrome mode at a speed faster than reading in the color mode, the image reading apparatus comprising:selecting means, in reading in the color mode, for time sharing and multiplexing analog signals of the color components output from the sample holding means separately in rows of even-number pixels and odd-number pixels, and in reading in the monochrome mode, for outputting a color component selected as a dropout color among the analog signals of the color components output from said sample holding means separately in rows of even-number pixels and odd-number pixels, or for outputting a luminance signal from the analog signals of the color components output from the sample holding means separately in rows of even-number pixels and odd-number pixels, signal converting means for converting analog signals output from said selecting means into digital signals, and rearranging means, in reading in the color mode, for outputting the digital signals from the signal converting means, and in reading in the monochrome mode, for rearranging data rows that had been divided into rows of even-number pixel and odd-numbered pixel into a single sequential data row.