JPH0453295B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an arithmetic device.

[Conventional technology]

Conventionally, calculations are performed based on various signals in order to remove distortions contained in the signals and to perform various correction processes on the signals. A specific example of such calculations is correction of each signal.

In color recording devices and color display devices,
It is necessary to correct the input color signal by converting it into a desired color signal due to distortion of the read color signal at the image input unit or deviation from the ideal color characteristics of the recording medium or display medium. For example, in color laser beam printers and color inkjet printers, toner and ink do not have ideal spectral reflectance distribution characteristics for the primary colors cyan, magenta, and yellow, so color correction is not performed on the input signal. When a color image is recorded, only an extremely low-quality image with a hue different from the intended one can be obtained.

[Problem that the invention seeks to solve]

Conventionally, the desired output color signal was obtained by arithmetic processing of the input color signal using an electric circuit, but this method has a slow processing speed, so it is difficult to process the input color signal when the number of pixels is large. It takes a long time, and if advanced color correction processing is attempted, the processing time becomes even longer and the electric circuit for the processing becomes complicated.

[Means for solving problems]

It is an object of the present invention to solve the problems of the prior art described above, to provide an extremely fast processing speed, to be able to perform advanced calculations with a relatively simple configuration, and to make the device extremely compact. The purpose of this invention is to provide an arithmetic device that can perform the following functions.

The above object of the present invention is to perform the following matrix operation, when n and m are integers of 2 or more. The arithmetic unit that performs the calculation is composed of n light sources that each emit n light beams with intensities corresponding to the S ₁ , S ₂ , ..., S _o , a thin film optical waveguide that propagates the n light beams, and a thin film optical waveguide that propagates the n light beams. A grating type optical modulator is provided on the waveguide and diffracts a part of each light beam propagating through the waveguide with an intensity corresponding to S ₁ , S ₂ , ..., S _o , and each light beam from the optical modulator is a plurality of photodetectors each receiving a diffracted light beam and a light beam that has not passed through the optical modulator; are provided in the optical path leading to the photodetector, and each of the a ₁₁ ,..., a _oo and
By adding or subtracting the outputs of a plurality of optical attenuators exhibiting transmittances corresponding to the absolute values of b ₁₁ ,...b _on and the respective photodetectors, the aforesaid S ₁ ', S ₂ ',..., S _o ' This is achieved by comprising an arithmetic circuit that obtains an electrical signal corresponding to the .

[Effect]

In the arithmetic device of the present invention, at least a part of the computation is executed at high speed when the light source emits light and when the emitted light flux is modulated.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. Note that the embodiment will describe color correction calculations.

FIG. 7 is a block diagram of a color image recording device incorporating the color correction calculation device of the present invention. In the figure, 1 is an input section, 5 is a color correction section, that is, a color correction calculation device according to the present invention, and 9 is an output section. In the input section 1, a color original is read by an image sensor such as a CCD. The light receiving section of the image sensor is equipped with filters for the primary colors cyan, magenta, and yellow, which provide color signals (electrical signals) that are sent to the input section 1.
, preprocessing such as log conversion is performed, and the color correction unit 5 receives a cyan signal (hereinafter referred to as "C signal") 2, a magenta signal (hereinafter referred to as "M signal") 3, and a yellow signal ( (hereinafter abbreviated as "Y signal") 4 is output. In the color correction section 5, the following calculations are performed, and a corrected cyan signal (hereinafter referred to as "C'signal") 6 and a corrected magenta signal (hereinafter referred to as "M'signal") are sent to the output section 9. ) 7 and a corrected yellow signal (hereinafter abbreviated as "Y'signal") 8.

C′ M′ Y′=AC MY+BC ² M ² Y ² CM MY YC ……(1) Here, A=a ₀₀ a ₀₁ a ₀₂ a ₁₀ a ₁₁ a ₁₂ a ₂₀ a ₂₁ a ₂₂ ……(2 ) B=b ₀₀ b ₀₁ b ₀₂ b ₀₃ b ₀₄ b ₀₅ b ₁₀ b ₁₁ b ₁₂ b ₁₃ b ₁₄ b ₁₅ b ₂₀ b ₂₁ b 22 b ₂₃ b _{24 b 25 ...} (3) The above formula (1) The first term on the right side consists of first-order terms of C, M, and Y, and in simple color correction processing, processing is performed by taking the terms up to this point. A is the coefficient matrix of this first-order term, and the diagonal elements are usually 1. The second term on the right side of equation (1) above is a quadratic term of C, M, and Y, and advanced color correction processing includes this term. B is a coefficient matrix of quadratic terms. Each element of A and B can take either positive or negative values, but below, for convenience of explanation, the above a ₀₀ to _{a 22}
and b ₀₀ to b ₂₅ are all positive values.

FIG. 1 is a schematic partial perspective view showing a first embodiment of a color correction unit used in the color image recording apparatus, that is, a color correction calculation device according to the present invention.

In the figure, 11 is a substrate, and 12 is a thin film optical waveguide formed on the surface of the substrate 11. As the substrate 11, for example, Y-cut LiNbO ₃ or
A crystal having an electro-optic effect such as LiTaO ₃ can be used, and the optical waveguide 12 is formed on the surface of the crystal substrate.
By depositing Ti and thermally diffusing the Ti into the crystal substrate, a thin film having a higher refractive index than the crystal substrate is formed. Further, it is also possible to use a plate of glass, alumina, etc. as the substrate 11, form a thin film such as ZnO having an electro-optic effect on the substrate 11, and use the thin film as the optical waveguide 12.

13-1, 13-2 and 13-3 are semiconductor laser light sources, and these have a C signal and an M signal, respectively.
signal and Y signal are input. The laser light sources 13-1, 13-2, and 13-3 are coupled to the substrate 11 and the optical waveguide 12 so that the high speed light emitted from them is propagated within the optical waveguide 12. Laser light source 13-1, 13-2
and 13-3, respectively, and are emitted from the optical waveguide 12.
Light beams 14-1, 14-2 and 14- propagating within
Waveguide lenses 15-1, 15-2, and 15-3 are formed at the positions where 3 passes through, respectively. The waveguide lens is, for example, a geodesic lens, a Lunepul lens or a grating lens.

16-1, 16-2, 16-3, 16-4, 1
6-5 and 16-6 are comb-shaped electrodes formed on the optical waveguide 12. Comb-shaped electrodes 16-1, 16
-2 and 16-3 are located in the area where the light beam 17-1 collimated by the lens 15-1 enters, and the arrangement pitch direction of the electrode combs is the light beam 17-1.
It is arranged so as to be almost perpendicular to the traveling direction of the vehicle. The comb-shaped electrodes 16-4 and 16-5 are connected to the lens 1.
It is located in a region where the beam 17-2 collimated by the electrode 5-2 enters, and is arranged so that the pitch direction of the combs of the electrodes is substantially perpendicular to the traveling direction of the beam 17-2. The comb-shaped electrode 16-6 is located in a region where the light beam 17-3 collimated by the lens 15-3 enters, and is arranged so that the pitch direction of the combs of the electrode is almost perpendicular to the traveling direction of the light beam 17-3. has been done. These comb-shaped electrodes can be manufactured by depositing Al on the optical waveguide 12 and then forming it into a desired pattern using photolithography technology. Incidentally, in order to reduce the loss in the amount of light beam propagating through the optical waveguide 12 under these comb-shaped electrodes, a buffer layer of SiO ₂ with a thickness of about 1500 Å is formed between the optical waveguide 12 and the Al comb-shaped electrodes. It is preferable to keep it. A C signal is inputted to the comb-shaped electrode 16-1, an M signal is inputted to the comb-shaped electrodes 16-2 and 16-4, and the comb-shaped electrodes 16-3, 16-5, and 16-
6 is inputted with a Y signal.

By applying a voltage based on each signal to the comb-shaped electrodes, a periodic refractive index change occurs within the optical waveguide 12 with a pitch in a direction substantially perpendicular to the traveling direction of the light beam due to the electro-optic effect, and this changes the phase. It acts on the light beam as a diffraction grating. The strength of this electro-optic effect is proportional to each signal.

18-1, 18-2, 18-3, 18-4, 1
8-5 and 18-6 are comb-shaped electrodes 16-
1, 16-2, 16-3, 16-4, 16-5, and 16-6, which are diffracted light beams that are diffracted by the diffraction gratings, and each area where the diffracted light beams reach has an optical attenuation. Vessel 19-1, 19-
2, 19-3, 19-4, 19-5 and 19-6
A photodetector 20-1 and a photodetector 20-1 are respectively provided behind the optical attenuator in the traveling direction of the diffracted light beam.
20-2, 20-3, 20-4, 20-5 and 2
0-6 are provided. The optical attenuator can be formed by arranging a material with a high refractive index and light absorbing property, such as TiO ₂ or Ta ₂ O ₅ , on the optical waveguide 12. Furthermore, instead of these materials, the optical waveguide can be formed by vapor deposition or the like. A metal film formed on 12 can also be used. Optical attenuator 19-1, 19-2, 19
The light transmittances of -3, 19-4, 19-5 and 19-6 are proportional to b ₀₀ , b ₀₃ , b ₀₅ , b ₀₁ , b ₀₄ and b ₀₂ respectively. As the photodetector, for example, a photovoltaic element made of amorphous silicon can be used, and the light receiving section is obtained by forming an amorphous silicon layer on the optical waveguide 12.

21-1, 21-2 and 21-3 are optical attenuators similar to the above-mentioned optical attenuator 19-1, but these are optical attenuators 17-1, 17-2 and 17-3, respectively.
Interdigitated electrodes 16-1, 16-2 and 16-
3. It is located in a region where the light flux that has not passed under the comb-shaped electrodes 16-4 and 16-5 and the comb-shaped electrode 16-6 is incident. These optical attenuators 21-
The light transmittance of 1, 21-2 and 21-3 is respectively
It is proportional to a ₀₀ , a ₀₁ and a ₀₂ . Luminous flux 17-1,
Photodetectors 22-1, 22-2, and 22-3 are provided behind the optical attenuators 21-1, 21-2, and 21-3, respectively, with respect to the traveling direction of the optical attenuators 17-2 and 17-3. These photodetectors are similar to the photodetector 20-1 described above.

The optical waveguide type arithmetic device shown in Fig. 1 is as described above (1).
It is used to perform calculations on expressions.

Semiconductor laser light sources 13-1, 13-2 and 1
3-3 emits light with an intensity proportional to the C signal, M signal, and Y signal, respectively. These lights are coupled to the optical waveguide 12 by coupling.
The light beams 14-1, 14-2 and 14-
It becomes 3. These light beams propagate within the optical waveguide 12 while repeating total reflection many times at the interface with the atmosphere and the interface with the substrate 11, and reach the lenses 15-1, 15-2, and 15-3. Lenses 15-1, 15-2 and 15-3 have substantially the same characteristics, and light sources 13-1, 13-2 and 1
3-3 and lenses 15-1, 15-2 and 15-3
They are arranged so that the distance between them is substantially the same. And lenses 15-1, 15-2 and 1
The arrangement is such that the light beams 17-1, 17-2, and 17-3 emitted to the light beam 5-3 are substantially parallel to each other.

Comb-shaped electrodes 16-1, 16-2, 16-3, 1
6-4, 16-5 and 16-6 are C, respectively
A voltage proportional to the M, Y, M, Y, and Y signals is applied, thereby forming a diffraction grating in the optical waveguide 12 below each comb electrode with an intensity approximately proportional to each signal, thus Luminous flux 18-1, 18-2, 18-3, 18- diffracted by each comb-shaped electrode
4, 18-5 and 18-6 are respectively C ² , CM,
Almost proportional to CY, M ² , MY and Y ² . Of course, the localities of the light beams 17-1, 17-2 and 17-3 are proportional to C, M and Y, respectively.

Thus, the optical attenuators 19-1, 19-2, 19
-3, 19-4, 19-5 and 19-6, and 21-1, 21-2 and 21-3, and the photodetectors 20-1, 20-2, 20-3,
20-4, 20-5 and 20-6, and 22
The intensities of light incident on -1, 22-2 and 22-3 are b ₀₀ C ² , b ₀₃ CM, b ₀₅ YC, b ₀₁ M ² , b ₀₄ MY and
It is approximately proportional to b ₀₂ Y ² as well as a ₀₀ C, a ₀₁ M, and a ₀₂ Y, and therefore each photodetector provides an output proportional to these.

In order to find C′ in equation (1), it is sufficient to add the outputs of each photodetector, but in reality, the coefficients of each term are negative, so subtraction must also be performed. .

FIG. 2 is a block diagram showing a signal processing circuit for performing such addition and subtraction.

Now, among the elements of matrices A and B,
Assume that a ₀₁ , b ₀₃ and b ₀₄ are given negative signs.
Photodetector 20-1, 20-3, 20-4, 20-
The outputs of 6, 22-1 and 22-3 are added by an adder 25, while the outputs of photodetectors 20-2, 20-
The outputs of 5 and 22-2 are added by an adder 26, and the outputs of the adder 25 and the adder 26 are inputted to an adder 27 with opposite signs to perform subtraction, so that a ₀₀ C -a ₀₁ M+a ₀₂ Y+b ₀₀ C ²
＋b ₀₁ M ² ＋b ₀₂ Y ² −b ₀₃ CM−b ₀₄ MY＋b ₀₅ YC＝
An output color signal C′ is obtained.

The above has explained the device for obtaining the C' signal, but the device as shown in Fig. 1 is used to obtain the M' signal.
By preparing the respective attenuators for the Y' signal, setting the transmittance of each attenuator appropriately, and appropriately setting the wiring of the signal processing circuit as shown in Fig. 2, the M' signal and the Y' signal are prepared in the same way. ' signal can be obtained.

FIG. 3 is a schematic partial plan view showing a second embodiment of the arithmetic device of the present invention.

In FIG. 3, diffracted light beams 18-1, 18-
2, 18-3, 18-4, 18-5 and 18-
6, and luminous fluxes 17-1, 17-2 and 17-
The difference from the one shown in FIG. 1 is that three optical attenuators are arranged in parallel in each region where light beams enter, and photodetectors are arranged independently at the rear with respect to the traveling direction of the light flux. Optical attenuator 19-1-1, 19-2-
1, 19-3-1, 19-4-1, 19-5-1
and 19-6-1, and 21-1-1, 21
The light transmittance of -2-1 and 21-3-1 is
b ₀₀ , b ₀₃ , b ₀₅ , b ₀₁ , b ₀₄ and b ₀₂ , and a ₀₀ ,
are proportional to a ₀₁ and a ₀₂ , and these are the optical attenuators 19-1, 19-2, 19-3, 1 in FIG.
9-4, 19-5 and 19-6, and 21-
1, 21-2 and 21-3. Also,
Optical attenuator 19-1-2, 19-2-2, 19-3
-2, 19-4-2, 19-5-2 and 19-6
-2, and 21-1-2, 21-2-2, and 21-3-2 are the coefficients b ₁₀ , b ₁₃ , b ₁₅ , b ₁₁ , b respectively when calculating M' in equation (1). ₁₄ and
b ₁₂ , and is proportional to a ₁₀ , a ₁₁ and a ₁₂ .
In addition, optical attenuators 19-1-3, 19-2-3, 1
9-3-3, 19-4-3, 19-5-3 and 1
9-6-3, and 21-1-3, 21-2-
The light transmittances of 3 and 21-3-3 are b ₂₀ , b ₂₃ , b ₂₅ , which are the coefficients when calculating Y' in equation (1), respectively.
b ₂₁ , b ₂₄ and b ₂₂ , and proportional to a ₂₀ , a ₂₁ and a ₂₂ .

Thus, the photodetectors 20-1-1, 20-2-
1, 20-3-1, 20-4-1, 20-5-1
and 20-6-1, and 22-1-1, 22
-2-1 and 22-3-1 provide the same outputs as in the case of FIG. 1, and by processing these in the signal processing circuit of FIG. 2, the C' signal can be obtained.

Photodetector 20-1-2, 20-2-2, 20-
3-2, 20-4-2, 20-5-2 and 20-
6-2, and from 22-1-2, 22-2-2 and 22-3-2, b ₁₀ C ² , b ₁₃ CM,
b ₁₅ YC, b ₁₁ M ² , b ₁₄ MY and b ₁₂ Y ² , and a ₁₀
Outputs approximately proportional to C, a ₁₁ M and a ₁₂ Y are obtained, and the M' signal can be obtained by appropriately adding and subtracting these using a circuit similar to that shown in FIG.

Photodetector 20-1-3, 20-2-3, 20-
3-3, 20-4-3, 20-5-3 and 20-
6-3, and 22-1-3, 22-2-3 and 22-3-3, respectively, b ₂₀ C ² , b ₂₃ CM,
b ₂₅ YC, b ₂₁ M ² , b ₂₄ MY and b ₂₂ Y ² , and a ₂₀
Outputs approximately proportional to C, a ₂₁ M and a ₂₂ Y are obtained, and the Y' signal can be obtained by appropriately adding and subtracting these using a circuit similar to that shown in FIG.

Thus, according to the device of this embodiment, the C' signal,
M' signal and Y' signal can be obtained simultaneously.

FIG. 4 is a schematic partial perspective view showing a third embodiment of the arithmetic device of the present invention. In the figure, parts similar to those in FIG. 1 are designated by the same reference numerals.

For example, a Y-cut substrate 11 is used.
A crystal having a piezoelectric effect and an acousto-optic effect such as LiNbO ₃ or LiTaO ₃ can be used, and the optical waveguide 1
2 is formed as a thin film having a higher refractive index than the crystal substrate by depositing Ti on the surface of the crystal substrate and thermally diffusing the Ti into the crystal substrate. Moreover, glass is used as the substrate 11, and the optical waveguide 12
As the material, As ₂ S ₃ which has an acousto-optic effect is used, and the piezoelectric effect is created between the comb-shaped electrode and the optical waveguide 12 only in the part of the comb-shaped electrode for generating surface acoustic waves in the optical waveguide 12. It is also possible to have a structure in which a ZnO layer having . According to this configuration, since ZnO, which has a large piezoelectric effect, is used, the surface acoustic wave excitation efficiency is good, and since As ₂ S ₃ , which has a large acousto-optic effect, is used, the light diffraction efficiency is high.

Semiconductor laser light sources 13-1, 13-2 and 1
3-3, luminous flux 14-1, 14-2 and 14-3,
The waveguide lenses 15-1, 15-2 and 15-3 and the light beams 17-1, 17-2 and 17-3 are the same as in FIG.

31-1, 31-2 and 31-3 are optical waveguides 1
The comb-shaped electrode 31-1 is a comb-shaped electrode for exciting surface acoustic waves in the area where the light beam 17-1 travels.
The comb-shaped electrode 31
-2 is for generating a surface acoustic wave 32-2 that propagates within the region in which the light beam 17-2 travels, and the comb-shaped electrode 31-3 generates an elastic surface wave 32-2 that propagates in the region in which the light beam 17-3 travels. surface wave 32
-3. In addition, 33-
1, 33-2 and 33-3 are sound absorbing materials for absorbing surface acoustic waves 32-1, 32-2 and 32-3, respectively.

Surface acoustic waves are ultrasonic waves that are trapped near the surface and propagate, and the strain and electric field based on this propagate with a periodic distribution. Due to the acousto-optic effect and electro-optic effect based on these strains and electric fields, a periodic refraction distribution occurs in the optical waveguide 12. This refractive index distribution acts on the light beam as a moving phase diffraction grating. The strength of these acousto-optic effects and electro-optic effects is proportional to the strength of surface acoustic waves.

18-1, 18-2 and 18-3 are the luminous flux 17-
1 is the diffracted light beam diffracted by the diffraction grating generated by the surface acoustic wave 32-1, and 18
-4 and 18-5, the light beam 17-2 is surface acoustic wave 3
It is the diffracted light beam generated by 2-2, and 1
8-6 is a diffracted light beam 17-3 generated by the surface acoustic wave 32-3.

Optical attenuators 19-1 to 19-6 and 21-1 to 2
1-3, and photodetectors 20-1 to 20-6 and 2
2-1 to 22-3 are the same as in FIG.

FIG. 5 shows the comb-shaped electrode 31-1 in FIG.
31-2 and 31-3 are waveform diagrams of drive signals. FIG.

As shown in the figure, alternating current having a constant frequency is amplitude-modulated by a C signal, an M signal, and a Y signal in sequence at regular time intervals T. Note that there is a period of no signal between the Y signal and the C signal. Comb-shaped electrode 31-
The same surface acoustic waves are excited from 1, 31-2 and 31-3.

Thus, the comb-shaped electrodes 31-1, 31-2 and 31-3 are arranged at different positions with respect to the light beams 17-1, 17-2 and 17-3, respectively. And the optical attenuator 19 for the comb-shaped electrode 31-1
-3 and the relative positional relationship of the photodetector 20-3,
The relative positional relationship of the optical attenuator 19-5 and the photodetector 20-5 with respect to the comb-shaped electrode 31-2, and the relative positional relationship of the optical attenuator 19-6 and the photodetector 20-6 with respect to the comb-shaped electrode 31-3. The positional relationship is almost the same. Also, the relative positional relationship of the optical attenuator 19-2 and the photodetector 20-2 with respect to the comb-shaped electrode 31-1, and the relative positional relationship of the optical attenuator 19-4 and the photodetector 20-4 with respect to the comb-shaped electrode 31-2. The relative positional relationship is almost the same. Furthermore, the positional relationship of the photodetectors 19-1, 19-2, and 19-3 is such that at a certain point in time, the diffracted light beam 18-1 is diffracted by the diffraction grating based on the portion of the surface acoustic wave 32-1 driven by the C signal. The diffracted light beam 18-2 is diffracted by a diffraction grating based on a portion of the surface acoustic wave 32-1 driven by the M signal, and the diffracted light beam 18-3 is driven by the Y signal. The surface acoustic wave 32-1 is diffracted by a diffraction grating based on the surface acoustic wave 32-1.

Therefore, at this point, the diffracted beam 18-4 has been diffracted by the diffraction grating based on the surface acoustic wave 32-2 portion driven by the M signal, and the diffracted beam 18-5 has been driven by the Y signal. It is diffracted by the diffraction grating based on the surface acoustic wave 32-2, and the diffracted light beam 18-6
appears to be diffracted by a diffraction grating based on a portion of the surface acoustic wave 32- driven by the Y signal.

Furthermore, at this point, the optical attenuators 21-1 to 21-2
The light beams 17-1 to 17-3 that are not diffracted by the surface acoustic waves 32-1 to 32-3 reach the light beam 1-3.

From the above, the photodetector 20-1 at this point
It will be seen that the outputs from 20-6 and 22-1 to 22-3 are exactly the same as in FIG. 1 above. Therefore, by processing these outputs using the processing circuit shown in Fig. 2, the C' signal can be obtained, and the M' and Y' signals can also be obtained in the same way. If the detector is as shown in Figure 3, the C' signal, M' signal and
It is also exactly the same as the above embodiment that the Y' signal can be obtained simultaneously.

According to this embodiment, the number of comb-shaped electrodes and wiring locations can be reduced, so that the structure can be simplified.

In the above embodiment, a specific example having an element structure in which the light source to the photodetector are integrated was shown, but in the device of the present invention, the light source and the collimator lens are arranged at a position apart from the optical waveguide substrate. An optical waveguide substrate in which collimated parallel light is introduced into the optical waveguide using a prism coupler or grating coupler, etc., and an optical waveguide substrate in which the guided light beam is emitted outside the optical waveguide using a prism coupler or grating coupler, etc. Also included is one in which the light is made incident on an optical attenuator and a photodetector located at separate locations.

In the above embodiment, color correction using up to the second-order term is shown, but comb-shaped electrodes are additionally used, and the comb-shaped electrodes are appropriately arranged on the optical waveguide to appropriately set the optical path of each light beam. However, by driving each comb-shaped electrode based on a color signal and using a suitable attenuator, color correction including terms of third order or higher can be performed in the same way.

Although the color correction calculation has been described above, the apparatus of the present invention can be applied not only to the color correction calculation but also to various calculations, for example, to the calculation for edge enhancement in image reading. In the calculation for edge enhancement, if the input signal intensity of a given pixel in an image is y and the input signal intensities of pixels on both sides adjacent to the pixel are x and z, the edge-enhanced output of the pixel is In order to obtain the signal y', the following calculation is performed.

y'=y+d(ax+by+cz) ³ =y+a ³ dx ³ +b ³ dy ³ +c ³ dz ³ +6abcdxyz+3a ² bdx ² y +3ab ² dxy ² +3b ² cdy ² z +3bc ² dyz ² +3c ² adz ² x +3ca ² dz x ^2This is That is, an operation is performed to add a correction term d (ax + by + cz) ³ to the input signal y at the pixel, and as a result, an edge-enhanced output signal with less noise and an edge-emphasized degree determined by the coefficient d can be obtained. Generally well known (usually a=c=-1, b=2). Therefore,
In the present invention, an edge-enhanced output signal y' can be obtained by processing the three light fluxes having intensities corresponding to x, y, and z in the same manner as described in the color correction calculation above. . When the same calculation is performed for all pixels, as shown in FIG. 6, the intensity distribution A of each pixel in the input image is
This means that we have obtained an output image with an edge-enhanced intensity distribution A'.

〔Effect of the invention〕

According to the arithmetic device of the present invention as described above, since the arithmetic operation is performed using light, the processing speed is extremely high, and high-level arithmetic operations can be performed with a relatively simple configuration. Furthermore, since the present invention uses an optical wave type element, the apparatus can be made very compact.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of the device of the present invention, and FIG.
This figure is a block diagram of a signal processing circuit, FIGS. 3 and 4 are partial perspective views of the device of the present invention, FIG. 5 is a waveform diagram of a drive signal for the comb-shaped electrodes, and FIG. It is a graph of image signal strength. 7th
The figure is a block diagram of a color image device. 11...Substrate, 12...Optical waveguide, 13-1~
13-3... Laser light source, 15-1 to 15-3
...Waveguide lens, 16-1 to 16-6...Comb-shaped electrode, 19-1 to 19-6, 21-1 to 21-
3... Optical attenuator, 20-1 to 20-6, 22-1
~22-3...Photodetector, 31-1~31-3...
...Comb-shaped electrode, 32-1 to 32-3...Surface acoustic wave, 33-1 to 33-3...Sound absorbing material.

Claims (1)

[Claims] 1. When n and m are integers of 2 or more, the following matrix operation, In the arithmetic device that performs S ₁ , S ₂ ,
..., S _o , n light sources that emit n light beams with intensities corresponding to a grating-type optical modulator that diffracts the light beams with intensities corresponding to S ₁ , S ₂ , ..., S _o , and receives each diffracted light beam from the light modulator and the light beam that does not pass through the light modulator. a plurality of photodetectors, each of which is provided in the optical path of each diffracted light beam from the light modulator to the photodetector and in the optical path of the light beam that has not passed through the light modulator to the photodetector, each of which is connected to the a ₁₁ , ..., a _oo and b ₁₁ , ... b _on by adding or subtracting the outputs of a plurality of optical attenuators exhibiting transmittances corresponding to the absolute values of b 11 , ... b on and the outputs of the respective photodetectors to obtain the S ₁ ′, S ₂ ′ , ..., an arithmetic circuit that obtains an electrical signal corresponding to S _o ′.