JP3000723B2 - Display device with color correction status - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color-corrected display device.
In particular, the present invention relates to a display device in a state of color correction manually performed in an image input device.

[0002]

2. Description of the Related Art Conventionally, color correction of image data generated by an image input device such as an image reading device is performed by using a color palette to correct the color of image data taken from an image input device into a host computer by software processing. Replaces the above colors and corrects the color. Performs color correction on the image data taken into the host computer from the image input device by a software processing. Hosts a plurality of color correction data set in the image input device in advance. -Various color correction methods, such as performing color correction by selecting from the computer side, have been applied.

[0003]

The above-described conventional color correction method described above has the advantage that the degree of freedom of color correction is high and the method of specifying color correction is simple, but the operation speed by software processing is increased. Is slow, so that a large time delay occurs in the conversion of the entire display screen, which is not suitable for manual color correction. If the conversion of only a part of the display screen is performed so that the time delay due to the software processing does not cause inconvenience to the manual color correction, the above problem cannot be solved. However, as is well known, the characteristics of the human eye with respect to color also change depending on the size of the display screen, so that a solution such as reducing the calculation time by reducing the display screen as described above. No means can be adopted. The conventional color correction method described above has an advantage that the color correction is performed in real time because it is performed by a circuit configuration. However, the conventional color correction method is performed by a plurality of color correction data preset in an image input device. It is unknown what the result of the color correction will be, and the operability for performing the color correction is poor, requiring a skilled operator as an operator, and the color correction if not actually performed. There is a problem that the result cannot be confirmed.

[0004]

According to the present invention, there is provided an image input apparatus having a color correction matrix of 3 rows and 3 columns or more capable of designating a matrix coefficient from the host computer side. Means for transferring the corrected matrix coefficient, and obtaining a color signal corrected by the operation of the above-described color correction matrix of three rows and three columns performed using the matrix coefficient transferred to the image input device; And a converted color pattern obtained by performing a matrix operation on the reference color by using the specified matrix coefficient specified by the host computer and transferred to the image input device. A display device in a color-corrected state, comprising: Means for converting color correction information inputted by designating the matrix into a matrix coefficient, and an image input device comprising a color correction matrix of 3 rows and 3 columns or more capable of designating the matrix coefficient from the host computer side , The converted matrix coefficient is transferred as a specified matrix coefficient, and a color correction matrix of 3 rows and 3 columns or more is performed using the specified matrix coefficient transferred to the image input device. The means for obtaining a color signal corrected by operation, a pattern based on the reference color, and a matrix operation of the reference color are performed by the specified matrix coefficient specified by the host computer and transferred to the image input apparatus. By comparing the converted color pattern obtained with the above with a smaller number of display pixels to the number of effective display pixels, the host computer To provide a display device of a color correction status comprising a means for displaying on the Yuta side on the display.

[0005]

The matrix coefficient specified on the host computer side is transferred to an image input device having a color correction matrix of 3 rows and 3 columns or more capable of specifying the matrix coefficient from the host computer side. On the input device side, 3
A color signal whose color has been corrected by the operation of the color correction matrix of three or more rows is generated. A pattern based on a reference color and a pattern based on a converted color obtained by performing a matrix operation on the reference color based on the specified matrix coefficient transferred to the image input device are displayed on the display of the host computer in comparison. Let it.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a display device in a color correction state according to the present invention.
1 is a block diagram of an image information processing apparatus having a display device in a color correction state, FIG. 2 is a block diagram showing a configuration example of a component for performing signal processing including color correction, and FIG. 3 is a configuration of a color correction calculation unit. FIG. 4 is a block diagram showing an example, and FIG. 4 is a diagram showing an example in which a reference color and a correction color are displayed on a display in comparison. In FIG. 1, which is a block diagram of an image information processing apparatus having a display device in a color correction state, 1 is an image input device, 2 and 4 are interfaces, 3 is a bus, 5 is a host computer, and 6 is an operation unit. , 7 are displays, and I and O are signal transmission lines. In the image information processing apparatus shown in FIG. 1, an image input apparatus 1 to which information such as a reading area, resolution, gradation, and color tone is given from a host computer 5 via an interface 4, a bus 3, and an interface 2 is read. The read image data is supplied to the host computer 5 via the interface 2, the bus 3, and the interface 4, and the read image is displayed on the display 7. Information of the color tone reflecting the intention of the creator (operator) is input from the operation unit 6.

In the image input device 1, it is possible to specify a matrix coefficient from the host computer side.
It has a color correction matrix of three rows and three columns or more to which a calculation method having a high degree of freedom and good continuity is applied. The input data of the color tone for the color correction is input from the operation unit 6. If the input data of the color tone is a matrix coefficient in a color correction matrix of 3 rows and 3 columns or more, the input matrix is used. Since it is difficult for the operator to determine the color tone from the numerical value of the coefficient, the data input by the operator to the operation unit 6 may be data such as brightness, saturation, and hue. FIG. 2 is a block diagram showing a configuration example of a component for signal processing including a color correction operation provided in the image input apparatus 1.
A digital signal obtained by converting an image signal output from an image reading element such as a line image sensor into an analog-digital signal by an analog-digital converter is supplied to a supply line 8.
Is supplied to the signal processing unit 9 via the. Signal processing unit 9
Now, from the microprocessor unit 24 to the bus 27
After correcting the dark current unevenness and the sensitivity unevenness based on the control information supplied via the control line and adjusting the white balance, the color correction calculation unit 1 via the transmission lines 10 to 12.
6 are input to the input terminals 13 to 15 as three primary color signals Ri, Gi, Bi which are subjected to color correction.

In the above-described color correction operation unit 16, the host
Using the matrix coefficients for color correction transferred from the computer 5 to the image input apparatus 1 via the interface 4, the bus 3, the interface 2, the bus 29, and the like, the matrix coefficients are supplied to the input terminals 13 to 15 as described above. For example, the following three equations (1) are operated on the three primary color signals Ri, Gi, Bi targeted for color correction, and the three primary color signals Ro, Go, Bo corrected are output to the output terminal 17. ~ 19
Output to That is, the matrix coefficient for color correction transferred from the host computer 5 side to the color correction operation unit 16 in the image input apparatus 1 is the operation unit 6.
Is transmitted from the host computer 5 based on the input data on the color tone input by the operator at
When the matrix coefficients for the color correction are transferred from the host computer 5 to the image input apparatus 1 via the interface 4, the bus 3, the interface 2, the bus 29, and the like, first, the microprocessor unit 24
After that, the data is written into the coefficient memory 26 in the color correction calculation unit 16 and the calculation of the equation (1) is performed.

[0009]

(Equation 1)

FIG. 3 is a block diagram showing a specific example of the configuration of the color correction operation unit 16 described above. The input terminals 13 to 15 and the output terminal 17 of the color correction operation unit 16 shown in FIG. To 19 correspond to the input terminals 13 to 15 and the output terminal 17 in the color correction operation unit 16 shown in FIG.
~ 19. In FIG. 3, reference numerals 20 to 22 denote multipliers. Each of the multipliers 20 to 22 has an input terminal 13 to 1 in the color correction operation unit 16.
5 and a matrix coefficient as shown in FIG. 3 supplied from the coefficient memory 26, ie, the host computer 5; The image data is multiplied by the matrix coefficient for color correction transferred from the image input device 1 to the image input device 1, and the multiplication results are supplied to adders 23 to 25. The output signal Ro of the color corrected red primary color signal is output from the adder 23 to the output terminal 17.
The output signal Go of the color corrected green primary color signal is output from the adder 24 to the output terminal 18, and the output signal of the color corrected blue primary color signal is output from the adder 25 to the output terminal 19. Bo is output. The output signals Ro, Go, and Bo of the primary color signals sent to the output terminals 17 to 19 in the state where the color has been corrected as described above are supplied to the signal processing unit 30. The signal processor 30 outputs the output signals Ro, G of the respective primary color signals based on control information supplied from the microprocessor unit 24 via the bus 28.
After correcting the resolution, gradation, MTF, etc., for o and Bo, the output signals Ro, Go,
Bo is supplied to the host computer 5 via the bus 28, the interface 2, the bus 3, and the interface 4.

The host computer 5 obtains the reference color by performing a matrix operation using the pattern based on the reference color and the specified matrix coefficient specified by the host computer 5 and transferred to the image input apparatus 1. The converted color pattern is displayed on the display surface of the display 7 in comparison with the pattern as illustrated in FIG. The number of display pixels is, for example, about 100 × 120, that is, the pattern of the cut colors displayed on the display 7 in a state of being compared with each other and the pattern of the converted colors obtained by performing a matrix operation on the reference colors. , NT
If the calculation time is shortened to about 1/20 of the number of pixels in the case of displaying the image of the SC signal, the display on the display 7 can be easily approximated to the display operation in real time. Further, as described above, the pattern of the reference color and the pattern of the conversion color to be displayed on the display 7 are reduced in order to approximate the display operation in real time, so that the characteristics of the human eye with respect to the color are reduced. Even if the conversion color changes, the operator can compare the reference color and the conversion color and clearly perceive how the conversion color has changed with respect to the reference color.

As described above, the signal processing for color correction performed by the color correction calculation unit 16 by the calculation of the equation (1) is performed by the matrix coefficient Krr transferred from the host computer 5 to the image input apparatus 1. , Krg... Kbb, that is, the matrix coefficients Krr, Krg... Kbb shown in the above-described equation (1). As input information for color correction, the operator can input, for example, a contrast (C), a numerical value of a large number of matrix coefficients Krr, Krg.
The values of saturation (S) and hue (H) are set in the operation unit 6
To correct the color.
When the matrix of the matrix coefficient of 3 rows and 3 columns on the right side in the equation (1) is [Kij], the following equation (2) is obtained.
Equation (3), [Kij] = C · f (S) · f (H) (3) {where, C is saturation, f (S) is a function that changes by adjusting saturation, and f (H) is Input data for color correction is set as shown in {Function Changing Due to Hue Adjustment}. Also, the color reproduction calculation to be performed in the image input device 1 and the calculation for color correction by the matrix coefficients Krr, Krg... Kbb transferred from the host computer 5 to the image input device 1 are combined into one. The calculation may be performed using Mij matrix coefficients as shown in the following equation (4). [Mij] = [Jij] [Kij] (4) where [Mij] is a 3-row, 3-column coefficient matrix and [Jij] is a 3-row, 3-column coefficient for image input color reproduction. Matrix, [Kij] is a 3-by-3 coefficient matrix specified by manual color correction,

[0013]

As apparent from the above description, the display device in the color correction state according to the present invention uses the matrix coefficient specified on the host computer side by the host computer.
The image data is transferred to an image input device having a color correction matrix of 3 rows and 3 columns or more in which a matrix coefficient can be specified from the computer, and the image input device uses the transferred matrix coefficient to transmit 3 lines. A color signal whose color has been corrected by a calculation operation of a color correction matrix of three or more columns is generated, and a matrix operation is performed on the reference color using a pattern based on the reference color and the specified matrix coefficient transferred to the image input device. The converted color pattern obtained on the host computer is displayed on the display of the host computer in comparison with the converted color pattern. It can be performed with a pattern with a small number of pixels by comparing with a color pattern. It can also perform color reproduction and arbitrary color correction, and can provide various advantages such as adjustment of hue, saturation, and lightness without adding hardware components. .

[Brief description of the drawings]

FIG. 1 is a block diagram of an image information processing apparatus including a display device in a color correction state.

FIG. 2 is a block diagram illustrating a configuration example of a component for signal processing including a color correction operation.

FIG. 3 is a block diagram illustrating a configuration example of a color correction operation unit.

FIG. 4 is a diagram showing an example in which a reference color and a correction color are displayed in comparison on a display.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Image input device, 2, 4 ... Interface, 3 ... Bus, 5 ... Host computer, 6 ... Operation part, 7 ... Display, 9, 30 ... Signal processing part, 24 ... Microprocessor unit, 27-29 ... bus, 16 ... color correction operation unit, 26 ... coefficient memory,

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification code FI G06F 15/68 310 (56) References JP-A-5-323947 (JP, A) JP-A-63-48653 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) G09G 5/02 G06T 1/00 G06T 5/00 G09G 5/36 H04N 9/74

Claims (3)

(57) [Claims] 1. A matrix coefficient designated by a host computer is transferred to an image input device having a color correction matrix of 3 rows and 3 columns or more capable of designating a matrix coefficient from a host computer. Means for obtaining a color signal corrected by the operation of the above-described color correction matrix of three rows and three columns performed by using the matrix coefficient transferred to the image input device, a pattern based on a reference color, and a host computer By using the specified matrix coefficient specified by the device and transferred to the image input device, the pattern of the converted color obtained by performing the matrix operation on the reference color is displayed on the display of the host computer in comparison. And a display device in a color correction state. 2. A means for converting color correction information input by designating hue, saturation and lightness into matrix coefficients,
Transferring the converted matrix coefficients as designated matrix coefficients to an image input device having a color correction matrix of 3 rows and 3 columns or more capable of designating matrix coefficients from the host computer side;
Means for obtaining a color-corrected color signal by an operation of a color correction matrix of three rows and three columns performed using the specified matrix coefficient transferred to the image input device side, a pattern based on a reference color, and a host A pattern obtained by performing a matrix operation on the above-described reference color by using the specified matrix coefficient specified by the computer and transferred to the image input apparatus; and a display pixel having a small number of display effective pixels. Means for displaying on a display of the host computer by comparing the numbers with each other. 3. A color correction matrix of 3 rows and 3 columns or more configured to multiply a matrix coefficient required for color reproduction in an image input device and a matrix coefficient specified by a host computer. Claim 1
Or a display device in the color correction state of 2.