Method for reproducing color images which are distinguishable in a document having only two colors

Claim 1

A method of processing information on color images comprising the steps of: forming a color image of a document with two types of light rays of a low wavelength band and light rays of a high wavelength band divided by using one wavelength as a boundary, by receiving separately the two types of light with two light receivers; classifying each of the two types of light rays received in each of said two light receivers into more than three bands, with respect to the received light intensity; digitizing each classified band of the two types of light rays respectively; discriminating the color images depending on a matrix constructed by a combination of 2-bit digital signals of the two types of light rays; and developing images by using only two different colors for the two types of light rays, thereby the intensity of each color being determined depending on the 2-bit digital signals.

Claim 2

A method of processing information on color images comprising the steps of: forming a color image of a document with two types of light rays of a low wavelength band and light rays of a high wavelength band divided by using one wavelength as a boundary, by receiving separately the two types of light with two light receivers; classifying each of the two types of light rays received in each of said two light receivers into more than three bands, with respect to the received light intensity; digitizing each classified band of the two types of light rays respectively; discriminating the color images depending on a matrix constructed by a combination of 2-bit digital signals of the two types of light rays; and developing images by using only two different colors for the two types of light rays, thereby the intensity of each color being determined depending on the 2-bit digital signals.

Claim 4

A method of processing information on color images comprising the steps of: splitting light rays representing an image of a multicolor document provided by irradiating the document with white light into two types of light rays of a low wavelength band and of high wavelength band divided by using one wavelength as a boundary; forming optical images of the two types of light rays on two separate light receivers; taking out image signals in the form of output signals classified into more than three bands with respect to light intensity from said two light receivers; digitizing output signals from said light receivers with respect to the classified band of the light rays; discriminating color images depending on a matrix constructed as 2-bit digital signals with respect to each of the output signals; and developing images by using only two different colors for each of the output signals, thereby intensities of each color being determined depending on the 2-bit digital signals.

Claim 5

A method of processing information on color images comprising the steps of: splitting light rays representing an image of a multicolor document provided by irradiating the document with white light into two types of light rays of a low wavelength band and of high wavelength band divided by using one wavelength as a boundary; forming optical images of the two types of light rays on two separate light receivers; taking out image signals in the form of output signals classified into more than three bands with respect to light intensity from said two light receivers; digitizing output signals from said light receivers with respect to the classified band of the light rays; discriminating color images depending on a matrix constructed as 2-bit digital signals with respect to each of the output signals; and developing images by using only two different colors for each of the output signals, thereby intensities of each color being determined depending on the 2-bit digital signals.

Claim 6

A method of processing information on color images comprising the steps of: forming images on two separate light receivers with respect to light rays representing an image of a multicolor document produced by two lamps emitting light rays of different wavelengths; taking out image signals in the form of output signals classified into more than three bands with respect to light intensity from said two light receivers; digitizing output signals from said light receivers with respect to the classified band of the light rays; discriminating color images depending on a matrix constructed as 2-bit digital signals with respect to each of the output signals; and developing images by using only two different colors for each of the output signals, thereby intensities of each color being determined in dependent on the 2-bit digital signals.

Claim 7

A method of processing information on color images comprising the steps of: forming images on two separate light receivers with respect to light rays representing an image of a multicolor document produced by two lamps emitting light rays of different wavelengths; taking out image signals in the form of output signals classified into more than three bands with respect to light intensity from said two light receivers; digitizing output signals from said light receivers with respect to the classified band of the light rays; discriminating color images depending on a matrix constructed as 2-bit digital signals with respect to each of the output signals; and developing images by using only two different colors for each of the output signals, thereby intensities of each color being determined in dependent on the 2-bit digital signals.