초록 ▼

A dichromatic reading device is disclosed in which the difference is taken between output signals from a first image sensor receiving reflected light directly and a second image sensor receiving the reflected light after being passed through a filter which blocks a specific color component of the re

A dichromatic reading device is disclosed in which the difference is taken between output signals from a first image sensor receiving reflected light directly and a second image sensor receiving the reflected light after being passed through a filter which blocks a specific color component of the reflected light. The difference is converted into a binary signal which provides one color image information and which together with a binary signal obtained from at least the second image sensor and inverted, is NANDed to provide a second color image information.

대표청구항 ▼

A dichromatic reading device for use with variously colored information bearing sheets, comprising: a first image sensor responsive to light reflected directly from a sheet to produce a first analog pulse train containing plural pulses, each corresponding to a different color component of the reflec

A dichromatic reading device for use with variously colored information bearing sheets, comprising: a first image sensor responsive to light reflected directly from a sheet to produce a first analog pulse train containing plural pulses, each corresponding to a different color component of the reflected light, filter means capable of blocking a first color component of the reflected light, a second image sensor responsive to the reflected light after having passed through said filter means, to produce a second analog pulse train containing plural pulses, each corresponding to a different color component of the reflected light, first threshold means for converting the first analog pulse train into a first binary pulse train, second thresold means for converting the second analog pulse train into a second binary pulse train, first means for producing a third analog pulse train from the first and second analog pulse trains, third threshold means for converting said third analog pulse train into a third binary pulse train, and second means responsive to at least said second binary pulse train and said third binary pulse train to produce a first color printing signal when the device is scanning the information printed on the sheet in said first color, and a second printing signal when the device is scanning information printed on the sheet in colors other than the first color.