Method and apparatus for reading image

Claim 1

A method of reading an original image comprising: reading the original image with at least two different sampling intervals to produce first read image signals; subjecting said first read image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; comparing said image signals on the plane of orthogonal function transformation to remove undesirable signal components from said image signals on the plane of orthogonal function transformation and to produce an output signal on the plane of orthogonal function transformation wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected; and subjecting said output signal to an inverse orthogonal function transformation to produce a second read image signal.

Claim 2

A method of reading an original image comprising: reading the original image with at least two different sampling intervals to produce first read image signals; subjecting said first read image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; comparing said image signals on the plane of orthogonal function transformation to remove undesirable signal components from said image signals on the plane of orthogonal function transformation and to produce an output signal on the plane of orthogonal function transformation wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected; and subjecting said output signal to an inverse orthogonal function transformation to produce a second read image signal.

Claim 3

An apparatus for reading an original image comprising: reading means having at least two image sensors and having at least two different sampling intervals for reading an original image to produce first read image signals; means for subjecting said first read image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; means for comparing said image signals on the plane of orthogonal transformation to remove undesirable signal components from said image signals on the plane of orthogonal function transformation and to produce an output signal wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected; and means for subjecting said output signal to an inverse orthogonal function transformation to produce a second read image signal.

Claim 4

An apparatus for reading an original image comprising: reading means having at least two image sensors and having at least two different sampling intervals for reading an original image to produce first read image signals; means for subjecting said first read image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; means for comparing said image signals on the plane of orthogonal transformation to remove undesirable signal components from said image signals on the plane of orthogonal function transformation and to produce an output signal wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected; and means for subjecting said output signal to an inverse orthogonal function transformation to produce a second read image signal.

Claim 5

A method of reading a color image comprising: reading a color original image with at least two different spectral sensitivities and two different sampling intervals to produce first and second image signals; subjecting said read image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; comparing said image signals on the plane of orthogonal functional transformation to remove undesirable frequency components and to produce an output wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected; and subjecting said output to an inverse orthogonal function transformation to produce a second read image signal.

Claim 6

A method of reading a color image comprising: reading a color original image with at least two different spectral sensitivities and two different sampling intervals to produce first and second image signals; subjecting said read image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; comparing said image signals on the plane of orthogonal functional transformation to remove undesirable frequency components and to produce an output wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected; and subjecting said output to an inverse orthogonal function transformation to produce a second read image signal.

Claim 10

An apparatus for reading a color image comprising: reading means for reading the color image which comprises at least two sensors, said reading means having different spectral sensitivities and different sampling intervals to produce first read image signals; means for subjecting said first image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; means for comparing said image signals on the plane of orthogonal function transformation to remove undesirable frequency components from said image signals on the plane of orthogonal function transformation, wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected to produce an output on the plane of orthogonal function transformation; and means for subjecting said output on the plane of orthogonal function transformation to an inverse orthogonal function transformation to produce a second read image signal.

Claim 11

An apparatus for reading a color image comprising: reading means for reading the color image which comprises at least two sensors, said reading means having different spectral sensitivities and different sampling intervals to produce first read image signals; means for subjecting said first image signals to an orthogonal function transformation to produce image signals on a plane of orthogonal function transformations; means for comparing said image signals on the plane of orthogonal function transformation to remove undesirable frequency components from said image signals on the plane of orthogonal function transformation, wherein among said image signals on the plane of orthogonal function transformation frequency components having smaller absolute values are selected to produce an output on the plane of orthogonal function transformation; and means for subjecting said output on the plane of orthogonal function transformation to an inverse orthogonal function transformation to produce a second read image signal.

Claim 15

An apparatus for reading a color image comprising: first reading means comprising at least two image sensors for reading the color image with different spectral sensitivities and with a common sampling interval and for producing first outputs; second reading means comprising at least one image sensor having a spectral sensitivity over an entire visible range for reading the color image with a sampling interval different from that of said first reading means to produce second outputs; an adder for adding the first outputs; A/D converter means for converting said added first outputs and second outputs into digital data, respectively; transformation means for subjecting the digital data of said A/D converter means to an orthogonal function transformation and for producing orthogonally transformed outputs; means for diminishing frequency components of said orthogonally transformed outputs, said frequency components varying in accordance with the difference between said sampling intervals of said first and second reading means, and for producing diminished frequency component outputs; and inverse transformation means for subjecting the diminished frequency components outputs to an inverse orthogonal function transformation to produce a read image signal.

Claim 16

An apparatus for reading a color image comprising: first reading means comprising at least two image sensors for reading the color image with different spectral sensitivities and with a common sampling interval and for producing first outputs; second reading means comprising at least one image sensor having a spectral sensitivity over an entire visible range for reading the color image with a sampling interval different from that of said first reading means to produce second outputs; an adder for adding the first outputs; A/D converter means for converting said added first outputs and second outputs into digital data, respectively; transformation means for subjecting the digital data of said A/D converter means to an orthogonal function transformation and for producing orthogonally transformed outputs; means for diminishing frequency components of said orthogonally transformed outputs, said frequency components varying in accordance with the difference between said sampling intervals of said first and second reading means, and for producing diminished frequency component outputs; and inverse transformation means for subjecting the diminished frequency components outputs to an inverse orthogonal function transformation to produce a read image signal.

Claim 17

An apparatus for reading the color image comprising: first reading means comprising at least two image sensors for reading the color image with different spectral sensitivities and a common sampling interval and for producing a first output; second reading means having a common sensitivity as that of any image sensor of said first reading means and for reading the color image with a sampling interval different from that of said first reading means and for producing a second output; A/D converter means for converting the first and second outputs into digital data, respectively; transformation means for subjecting the digital data of the A/D converter means to an orthogonal function transformation and for producing orthogonally transformed outputs; means for comparing the orthogonally transformed outputs by comparing the outputs of one image sensor of said first reading means and the output of said second image sensor, and for removing undesirable signal components wherein frequency components varying in accordance with the difference of the sampling intervals of said first and second reading means are diminished; and inverse transformation means for subjecting the output of said comparing and removing means to an inverse orthogonal function transformation to produce a read image signal.

Claim 18

An apparatus for reading the color image comprising: first reading means comprising at least two image sensors for reading the color image with different spectral sensitivities and a common sampling interval and for producing a first output; second reading means having a common sensitivity as that of any image sensor of said first reading means and for reading the color image with a sampling interval different from that of said first reading means and for producing a second output; A/D converter means for converting the first and second outputs into digital data, respectively; transformation means for subjecting the digital data of the A/D converter means to an orthogonal function transformation and for producing orthogonally transformed outputs; means for comparing the orthogonally transformed outputs by comparing the outputs of one image sensor of said first reading means and the output of said second image sensor, and for removing undesirable signal components wherein frequency components varying in accordance with the difference of the sampling intervals of said first and second reading means are diminished; and inverse transformation means for subjecting the output of said comparing and removing means to an inverse orthogonal function transformation to produce a read image signal.