JPS60217359A - Arithmetic unit - Google Patents

Abstract

PURPOSE:To execute high-grade operations at a high speed with simple constitution by using light to execute operations. CONSTITUTION:An incident luminous flux 11 consists of three luminous fluxes having intensities proportional to C (cyan), M (magenta), and Y (yellow) signals, and a voltage where high frequencies f0, f1, f2, and f3 modulated on the basis of I, C, M, and Y signals respectively are multiplexed is applied to a piezoelectric element 13. Consequently, exit luminous fluxes 14a-14d each of which consists of three luminous fluxes are discharged from an acoustooptic (A/O) element 12, and these luminous fluxes are made incident on photodetectors 16-1-16-12 arranged in a matrix through an ND filter 15. Outputs of photodetectors 16-1, 16-2, 16-4, 16-5, 16-7, and 16-10 are added by an adder 17a, and outputs of photodetectors 16-3, 16-6, and 16-9 are added by an adder 17b, and outputs of these adders are subjected to subtraction in a subtractor 18 to obtain an output color signal. Connections of the ND filter 15 and adders are changed to obtain another output color signal.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to an arithmetic device.

[Prior art]

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 color signals.

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

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.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, it is an object of the present invention to provide a device that can perform calculations at high speed with a relatively simple configuration.

[Summary of the Invention] According to the present invention, the above objects are such that a light beam whose intensity is modulated based on a first signal is made incident on an optical deflector using an acousto-optic effect, and in the deflector, a first The incident light beam is diffracted by the acousto-optic grating realized by the intensity based on the signal, and the diffracted light beam is made incident on the light receiving element, and is processed based on the signal detected by the nuclear light receiving element. This is achieved by an arithmetic device characterized in that two signals are obtained.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on the drawings.

Note that the embodiment will describe color correction calculations.

FIG. 1 is a block diagram of a color image recording device incorporating a color correction device of the present invention. In the figure, 1 is an input section, 5 is a color correction section, that is, a color correction device according to the present invention,
9 is an output section. In input section I, the color original is C.
It is read by an image sensor such as OD. The light receiving section of the image sensor is equipped with primary color cyan, magenta, and yellow O-C+ filters, which provide a black color signal (electrical signal).
Preprocessing such as 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 referred to as "Y signal"). (abbreviated as "signal") 4 is output. In the color correction section 5, the following voice performance is performed, and a corrected cyan signal (hereinafter abbreviated as "C signal") is sent to the output section 9.
6. A corrected magenta signal (hereinafter abbreviated as "V signal") 7 and a corrected yellow signal (hereinafter abbreviated as "YI signal") 8 are output.

σ” ”OnC+ ”01M+ ”02Y+booC2
+bo1M2+b. 2Y2+bo3CM+bo4MY tensu. 5YC+gg(Cp Me Y) W = a1oc + a, IM +a, 2Y+. C
2+b11M2-F-b, 2Y2+b1. CM+b14
w+b, 5YC+g1 (Cv M e Y ) 'Y';'20C+ C2, M + &22Y+b2
oC2+b21M2+b22Y2+b2. CM+b24
MY+b25YC+g2(Ce M t Y ) [Here, gl(c*Msy)(t=op1sz) is C
, M and/or Y.] However, except for advanced color correction processing, gi (Ce Ms Y) is excluded. Also, the coefficient & of the above equation. o””ss and.

0 to b25(5) can take either positive or negative values, but for convenience of explanation below, all of these are assumed to be positive.

Figure 2 shows the acousto-optic system (
FIG. 2 is a diagram illustrating the operating principle of a modulation element (hereinafter abbreviated as rA10J). In the figure, 10 is a Rede light source;
12 is an A10 element, 13 is a piezoelectric element provided in the VO element 12, 15 is an ND' filter, and 16 is a light receiving element.

Now let's assume that C' in the above equation is calculated. , CM is calculated. By applying a voltage 9 based on the KC signal to the light source 10, a Rade beam 11 having an intensity proportional to the C signal is made to enter the A10 element 12 from the light 11110. On the other hand, by applying a voltage based on the M signal to the piezoelectric element 13, an elastic wave with an intensity proportional to the KM signal in the A10 element 12 is generated. The elastic wave propagates in the direction of arrow X in the figure, and a grating having a pitch direction in the X direction is formed within the ty'o element 12. From this K, the intensity of the light beam diffracted by the grating in the A10 element 12 is compared to the M signal (
6) This is an example. Therefore, the diffracted outgoing beam 14 from the A/'O element 12 has an intensity proportional to the product (CM) of the C signal and the M signal. On the other hand, the filter 15 has a coefficient in the above equation. A light transmittance corresponding to 3 is given. V
When the emitted light beam 14 from the O element is made incident on the light receiving element 16 via the filter 15, it is incident on the light receiving element 16. , CM enters the light flux with an intensity proportional to CM.

Thus, the light receiving element 16 outputs a signal. , CM are output.

Similarly, the light source 10 and the piezoelectric element 13 are
unit signal), C, M, and Y signals, and the transmittance of the filter 15 is determined by the coefficient a of the above formula. . ~”ss and bDo”” b25
By appropriately selecting one of these and making it correspond, the light receiving element 16 receives 1 in the above formula.
Signals of the next and second order terms are output.

FIG. 3 is a perspective view showing another aspect of VO modulation used in the device of the present invention. In this embodiment, a plurality of light beams are used as the incident light beam 11 in a vertical plane (that is, in a plane perpendicular to the pitch direction X of the grating in FIG. 3).
A plurality of light beams are made to enter the K A10 element 12 at different angles of incidence in the vertical plane, and a plurality of light beams are obtained as output light beams 14 from the A10 element 12 at different angles of incidence in the vertical plane.

Here, as shown in the figure, the incident light beam 11 is C, M, and Y.
By using three light fluxes with intensities proportional to the signals and applying a voltage based on the signal A to the piezoelectric element 13, four light fluxes proportional to CA, MA, and YA can be simultaneously obtained as the output light flux 14. Here, if an I, C, M, or Y signal is used as the signal A, signals of each of the first and second terms in the above equation can be obtained.

FIG. 4 is a perspective view showing another aspect of VO modulation used in the device of the present invention. In this embodiment, high frequency waves multiplexed at different frequencies are used to apply a high frequency voltage to the piezoelectric element 13. That is, as shown,
4 different frequencies fo.

The high frequencies of h-fs and fs are I, C, M and Y, respectively.
The signals are modulated based on the signals, superimposed, and input to the piezoelectric element 13. In the A10 element 12, there are four
A composite grating having four different pitches is formed, and the incident light beam 11 is split and diffracted by the grating at four different diffraction angles to obtain an output light beam 14 consisting of four light beams. Here, as shown in the figure, if a luminous flux with an intensity proportional to the signal B is used as the incident luminous flux 11,
Four light fluxes proportional to B, BY, BM, and BC are obtained simultaneously as the output light flux 14. Here, as signal B, C
, M or Y signals, the first and second order in the above equation
The following signals can be obtained.

FIG. 5 is a partial schematic perspective view for explaining the operation of the apparatus of the present invention. In this embodiment, the above-mentioned figures 3 and 4 are used.
A combination of the VO modulation methods shown in the figure is used. That is, the incident light beam 11 consists of three light beams each having an intensity proportional to the C, M, and Y signals, and the piezoelectric element 13 has a frequency (9) and a wave number fo that are modulated based on the I, C, M, and Y signals, respectively. High frequency multiplexed voltages of -h -fz and fs are applied. Therefore, each A10 element 12 has an output light beam 14a consisting of three light beams.

14b, 14e and 14d are emitted.

In FIG. 5, 15 is an ND filter.

FIG. 6 is a distribution diagram of the light beam incident on the ND filter 15, which is observed from the right side in FIG. Each beam has an intensity proportional to the value shown.

Further, FIG. 7 is a plan view of the ND filter 15, which is viewed from the right side in FIG. 5. The filter 15 is divided into 120 parts in a matrix, and the light transmittance of each part is proportional to some of the coefficients of the above equation as shown in the figure. This is to obtain a signal.As can be seen from Fig. 6, among the light fluxes incident on the filter 17, the light fluxes proportional to the crossterms CM, MY, and YCK are 2.
16-1, 16-2, and 16-2 in FIG. 5. ．． --・16-1
Reference numeral 2 denotes a light receiving element, which is arranged at a position corresponding to one of each matrix element part of the ND filter 15, so that the light flux transmitted through the ND filter 15 is divided into corresponding light receiving elements for each IJ Fuchs element part. incident on . As mentioned above, since the filter 15 is partially shielded from light, the light receiving element 16-8.16 in FIG.
-11 and 16-12 are actually unnecessary. FIG. 8 is a distribution diagram of the luminous flux immediately after passing through the ND filter 17, that is, immediately before entering the light-receiving element, as viewed from the right side in FIG. Each beam has an intensity proportional to the value shown.

Here, & among the coefficients in the above equation. 2 Suppose that $ b05 and b are given negative signs. The outputs of the light receiving elements 4 16-1.16-2.16-4.16-5.16-7 and 16-10 are added by an adder 17a,
- The outputs of the force light receiving elements 16-3, 16-6 and 16-9 are added by an adder 17b, and the outputs of these adders 17a and 17b are inputted with opposite signs to an adder 18 to perform subtraction. Therefore, the adder 18 outputs 1oooc.
+ao1M ao2y+booc2+b01M2+bo
2y2bo3CM-bo4w-1-bo, yc = c
An output color signal of ' is obtained.

Similarly, the light transmittance of each matrix element portion of the filter 15 is changed and each light receiving element and adder 17m and 17b are
By appropriately setting the connection with and performing signal processing, V
An output color signal and a y/output color signal can be obtained.

FIG. 9 is a partial plan view of a filter in another embodiment of the color correction apparatus of the present invention. In the above example, σ, y
Although a type in which the t and Y signals are obtained separately is shown, in this embodiment, a type in which these output color signals are obtained simultaneously is shown.

That is, in the apparatus of this embodiment, the filter 15 shown in FIG. 9 is used instead of the filter 15 shown in FIG. 7 used in the above embodiment as the filter 15 in FIG. In this filter, the parts corresponding to each matrix element part in FIG. All coefficients up to the quadratic term for M and/or Y in the above equation are related to the light transmittance of the divided parts. A light-receiving element is arranged respectively, and receives the filter-transmitted light.Coefficients a., (t=o, t, 2) and j (j=
0,1. The CI signal can be obtained by processing the output signal from the light-receiving element after the filter division portion corresponding to 5) in the same manner as in the above embodiment, and the coefficients ', i, and , j Furthermore, by processing the output signals from the light-receiving elements behind the filter division portion corresponding to a21 and b2j, the zo signal is simultaneously changed.
A Y' signal can be obtained.

In the embodiment shown in FIG. 5, C is used as the incident light beam 11.
, M and Y signals are made incident at different angles of incidence, and the high frequency voltage applied to the piezoelectric element 13 is f.
A voltage multiplexed by o, h, fz and fl is used, but conversely, a voltage multiplexed by fl, :b and fl is used as the high frequency voltage applied to the piezoelectric element (13). The incident light beam 11 is modulated based on the C, M and Y signals corresponding to each frequency.
A similar operation can be obtained by making four light beams proportional to the I, C, M, and Y signals incident at different angles of incidence.

Incidentally, instead of the plurality of light beams having different incident angles as in the above embodiment, a light beam obtained by multiplexing a plurality of light beams having different wavelengths may be input to similarly obtain diffracted light beams in different directions.

Furthermore, by arranging VO elements in series in multiple stages as shown in FIG. 3 or 4, C in the above formula can be reduced.

It is also possible to perform calculations including terms of higher order than third order regarding M and/or YK. In this case, the traveling direction of the elastic wave of each VO modulation element can be appropriately set according to the direction in which the output light beam is taken out. In this case, as shown in FIG. 10, when the light beam emitted from the A10 element 12 is reflected by the reflecting mirror 20 and made to enter the Vo element 12 again, calculation of higher order terms can be performed. There is.

(14) In this case, the number of VO elements used can be reduced.

Furthermore, by using means such as additionally using a spatial light modulator, giving the light modulator a light transmittance based on a color signal, setting the optical path of each light beam appropriately, and using an appropriate filter, it is possible to Color correction including the term can also be performed in a similar manner.

The above description has been made regarding calculations for color correction, but the method and apparatus of the present invention can be applied not only to calculations for color correction but also to various calculations; for example, they can be applied to calculations for edge enhancement in image reading. I'll text you. In the calculation for edge enhancement, if the input signal strength of any pixel in the image is y and the input signal strengths of the pixels on both sides adjacent to the pixel are X and 2, then the edge-enhanced output of the pixel is In order to obtain signal 7, the following calculation is performed.

y'=y+d(ax-1-by-)cz)'-y-1-
a dx +b dy +'e dz +6abcdx
yz-l-3a bdx y+3ab dxy -)-
3b edy z+3be dyz -)-3e ad
z x+3ea dzx This means that the input signal y at the pixel has a correction term d (ax+b y+a z )
It is generally well known that an edge emphasis output signal with less noise and an edge emphasis degree determined by the coefficient d can be obtained by this operation (usually a=e=-1 , b==2). Therefore, in the present invention, X, 7. By processing K in the same way as described in the color correction calculation above for three light beams having intensities corresponding to Z, an edge-emphasized output signal y' can be obtained. When the same calculation is performed for all pixels, as shown in FIG. 11, an output image having an edge-enhanced intensity distribution A' is obtained from the intensity distribution A of each pixel in the input image. [Effects] According to the present invention as described above, since calculations are performed using light, the processing speed is extremely high, and high-level calculations can also be performed with a relatively simple configuration.

Moreover, advanced processing can be realized with a relatively simple configuration such as changing the angle of incidence of the incident light beam on the VO modulation element or multiplexing the high frequency voltage applied to the piezoelectric element of the VO element.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a color imaging device. FIG. 2 is a diagram showing the operating principle of the l'y'0 element. 3 and 4 are perspective views of the VO element in the device of the present invention. FIG. 5 is a partial perspective view of the device of the present invention, FIGS. 6 and 8 are luminous flux distribution diagrams, and FIGS. 7 and 9 are plan views of the filter. FIG. 10 is a partial plan view of the device of the present invention. FIG. 11 is a graph of image signal strength. 10: light source, 11: incident light flux, 12: VO element, 13
: Piezoelectric element, 14, 14&, 14b, 14e. 14d: Outgoing light flux, 15: Filter, 16°16-1
~12: Light receiving element, 17m, 17b, 18: Adder. (17) Figure 1

Claims (1)

[Claims] (1) In an arithmetic device for obtaining one or more second signals from a plurality of first signals, a light beam whose intensity is modulated based on the first signal utilizes an acousto-optic effect. The incident light beam is made incident on an optical deflector, and the incident light beam is diffracted by the acousto-optic effect realized by the intensity based on the first signal in the deflector, and the diffracted light beam is made to enter the light receiving element. , an arithmetic device characterized in that a second signal is obtained by performing processing based on a signal detected by the light receiving element. (2) The arithmetic device according to item 1, in which the diffracted light flux is made incident on the light receiving element via a spatial filter; (3) The light flux incident on the optical deflector is in a plane perpendicular to the pitch direction of the grating of the deflector; The computing device according to the first term, which is composed of a plurality of light beams having different incident angles. (4) The arithmetic device according to item 1, wherein the light flux incident on the acousto-optic element is made by multiplexing a plurality of light fluxes having different wavelengths. (5) The arithmetic device according to item 1, wherein the input to the acousto-optic element is multiplexed in terms of frequency.