JPH08123376A - Display control method, device therefor and, display device - Google Patents

Abstract

PURPOSE: To provide a display control method and device therefor, and display device which can convert a switched and selected video signal in accordance with a display characteristic of a display section and display it. CONSTITUTION: A switchover switch 8 is switched in accordance with an input switching signal 13, and a picture signal inputted to an interface section 7 is selected. The selected picture signal is inputted to a gamma conversion table 9, converted conforming to gamma correction data, after that, outputted to a display device 11 and displayed. At the time, a microprocessor 12 switches an input switching signal 13, that is, changes gamma correction data in accordance with a characteristic of an inputted picture signal so that a color characteristic of a picture signal gamma-corrected is adapted to a color reproducing characteristic of the display device 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to one of a plurality of video signals.
The present invention relates to a display control method and device and a display device for selecting one of them and converting and displaying it so as to match display characteristics.

[0002]

2. Description of the Prior Art Video signals from a video source source include
There are three types of signals as shown below. (1) Gamma conversion processing is performed in advance according to the color reproduction characteristics of the connected display device (MTSC signal or the like). (2) The video signal is not gamma converted so as to correspond to the color reproduction characteristics of the connected display device,
If the characteristic is linear (such as the output signal of a graphics card). (3) Regardless of the color reproduction characteristics of the connected display device, the gamma correction processing is performed on the linear characteristics that have not been subjected to the gamma conversion processing, and the linear characteristics are output (for a graphics card with gamma conversion software). Output signal etc.).

Conventionally, when these various video signals are switched and input, data conversion (color matching) is performed so that the input video signals input are adapted to the color reproduction characteristics of the connected display device. It was just switching without applying.

[0004]

For this reason, conventionally, in the case of an image processing apparatus which switches many kinds of input video signals and displays them on one output display, color shift and image quality deterioration occur when switching the input video signals. Will end up. Also, several inverse gamma correction processing circuits must be added for each display device and input video signal used. As a result, the flexibility with respect to the input video signal is impaired, and the number of γ correction circuits provided increases the cost of the entire system.

The present invention has been made in view of the above-mentioned conventional example, and provides a display control method and device and a display device capable of converting and displaying a video signal selected by switching according to the display characteristics of a display section. With the goal.

Another object of the present invention is to provide a display control method and device and a display device capable of converting an input image signal according to the display characteristics of a display section or a display device.

Another object of the present invention is to provide a display control method and device and a display device capable of converting an image signal in conformity with various image signals by using a single conversion circuit.

Another object of the present invention is to store previously changed conversion data in correspondence with an input image signal, and when the image signal is selected, the stored conversion data. An object of the present invention is to provide a display control method and device and a display device capable of responding to input switching of an image signal at high speed by reading data and setting it as conversion data.

[0009]

In order to achieve the above object, the display control device of the present invention has the following configuration.
That is, a display control device for switching and inputting a plurality of image signals and outputting the same to a display device, wherein a selection means for switching and selecting an image signal to be input according to a switching signal, and an image selected by the selection means. It has a conversion means for converting the color characteristic of the signal according to the conversion data, and a control means for changing the conversion data according to the switching signal so that the conversion characteristic in the conversion means is adapted to the color reproduction characteristic of the display device. .

In order to achieve the above object, the display control method of the present invention includes the following steps. That is, it is a display control method of switching and inputting a plurality of image signals and outputting them to a display device, in which a step of switching and selecting an input image signal according to a switching signal and a color characteristic of the selected image signal are selected. According to the conversion data, and a step of changing the conversion data according to the switching signal so that the conversion characteristic in the conversion step is adapted to the color reproduction characteristic of the display device.

Further, in order to achieve the above object, the display device of the present invention has the following configuration. That is, a display device for switching and inputting a plurality of image signals and displaying the same on a display unit, and selecting means for switching and selecting the image signals to be input according to the switching signal, and the image signal selected by the selecting means. And a control means for changing the conversion data according to the switching signal so that the conversion characteristic in the conversion means is adapted to the color reproduction characteristic of the display section.

[0012]

With the above arrangement, the display control device of the present invention switches and selects the image signal to be input according to the switching signal, and converts the color characteristic of the selected image signal according to the conversion data. This conversion characteristic is converted so that the conversion characteristic is changed in accordance with the switching signal so that the color characteristic of the converted image signal matches the color reproduction characteristic of the display device.

Further, the display device switches and selects the image signal to be input according to the switching signal, and converts the color characteristic of the selected image signal according to the conversion data. The conversion data is changed according to the switching signal so that the color characteristic of the converted image signal matches the color reproduction characteristic of the display unit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the arrangement of the entire image processing apparatus according to the first embodiment of the present invention.

In FIG. 1, 1 is a television (TV).
Video card for use in video signal generation for TV conforming to the NTSC standard, PAL standard, etc. 2 is NTSC
Signal generation sources include, for example, 8 mm video and TV tuners. 3 is an RGB digital conversion circuit, which is NTS
The NTSC signal output from the C signal generation source 2 is converted into an RGB signal that can be easily handled by the interface unit in the subsequent stage.
A video card 4 for PC (personal computer) / WS (workstation) includes an analog video signal generation source 5 and a linear A / D conversion circuit 6. The analog video signal generation source 5 outputs a graphics image signal typified by RS343A, for example. Linear A
The / D conversion circuit 6 linearly converts the output signal of the analog video signal generation source 5 into a digital signal.

Reference numeral 7 denotes a display interface section, which is used for a display device 11 such as a CRT or a liquid crystal panel.
The video signals from the aforementioned video cards 1 and 4 are converted and output. 8 is a changeover switch, and an input changeover signal 13
The video signal input to the display interface unit 7 is switched according to the above. A microprocessor 12 can read and write data in the gamma conversion table 9. Reference numeral 14 denotes a bus for transferring data between the microprocessor 12 and the gamma conversion table 9, 1
An image processing circuit 0 performs image processing such as halftone processing.

A specific operation method of the image processing apparatus of this embodiment based on the above configuration will be described below.

First, when the changeover switch 8 is changed over by the input changeover signal 13 inputted from the outside according to the user's instruction and the video signal from the TV video card 1 is selected, the digital RGB signal for TV is selected. Is a gamma correction (γ = 1/1 /) in consideration of the gamma value (eg, γ = 2.2) of the monitor device assumed as the output.
2.2 = 0.45) is applied (STEP of FIG. 2)
1). Therefore, if the display device 11 has a linear color reproduction characteristic (shown in STEP 3 in FIG. 2), an inverse gamma correction (shown in STEP 2 in FIG. 2) is performed in order to make the characteristic of the video data linear. ) Must be given. At this time, the input switching signal 13 is input to the microprocessor 12, and the level of the signal 13 allows the microprocessor 12 to identify the type of the video signal currently selected by the selector switch 8.

When the microprocessor 12 detects the level of the input changeover signal 13 and recognizes the changeover state of the changeover switch 8, it stores the inverse gamma correction data in advance in the built-in ROM 12a of the microprocessor 12 or an external memory. And the like to read the inverse gamma correction data corresponding to the input data of the changeover switch 8, and read the read gamma correction data via the bus 14 into the gamma conversion table (R
AM) 9. As a result, the image data input to the gamma conversion table 9 via the changeover switch 8 is inverse gamma corrected by the gamma conversion table 9 and output. Then, the output data corrected by the gamma conversion table 9 is output to the display device 11 through the image processing circuit 10 and displayed.

Next, when the input switching signal 13 selects the digital video signal from the WS video card 4, the changeover switch 8 selects the digital video signal from the WS video card 4 by the input switching signal 13. Can be switched to. The digital video signal from the WS video card 4 is originally a gamma value (γ = 1 / 2..gamma.) In consideration of a gamma value (eg, γ = 2.2) of a monitor device which is supposed to be used as a display device. 2 = 0.45) and some have linear characteristics that are not. Here, a case having the latter linear characteristic (shown as STEP 1 in FIG. 3) will be described as an example.

In this case, if the color reproduction characteristic of the display device 11 which actually displays the image is the linear characteristic shown in STEP 1 of FIG. 3, it is not necessary to perform the inverse gamma conversion, and for example, STEP 1 of FIG. It is desirable that the input data be output as it is, as shown in ~ STEP3. Therefore, in this case, from the state where the RGB digital signal is input from the above-mentioned TV video card 1,
When switched to input the digital video signal from the WS video card 4, the contents of the gamma conversion table 9 may be reset by the microprocessor 12 using the same method as described above.

As described above, a video having different gamma characteristics from a plurality of input video signal sources is obtained by dynamically switching the gamma correction value according to the state of the input video signal to perform gamma correction. You can build a display interface that can handle signals.

FIG. 4 is a flow chart showing the operation of the image processing apparatus of the first embodiment of the present invention. The control program for executing this processing is stored in the ROM 12a and executed under the control of the microprocessor 12. . It is assumed that the color reproduction characteristic of the display device 11 and the gamma correction characteristic of the video signal input via the changeover switch 8 are known at the time of executing this process.

First, in step S1, the input switching signal 13 is input, and it is determined according to the level of the input switching signal 13 which input the switching switch 8 is switched to select (step S2). When the output of the TV video card 1 is selected, the process proceeds to step S3. In this case, the video signal input to the gamma conversion table 9 is already corrected as shown in STEP 1 of FIG. Inverse conversion is performed so that the linear characteristics are adapted to the color reproduction characteristics of the display device 11, as shown in FIG.
The gamma correction data having the inverse conversion characteristic as shown in STEP 2 is read from the ROM 12a (step S
3) Write the correction data in the gamma conversion table 9 (step S4).

On the other hand, if the data from the WS video card 4 is selected in step S2, step S5
In this case, since the video signal input to the gamma conversion table 9 has the characteristic shown in STEP 1 of FIG. 3, if it is output as it is, the display device 1
The linear characteristic is suitable for the color reproduction characteristic of 1. Therefore, as shown in STEP 2 of FIG. 3, the correction data for directly outputting the input data is read from the ROM 12a,
The data is written in the gamma conversion table 9 (step S4).

Thus, when the input video signal is switched, the gamma conversion characteristic is changed according to the input video signal, and the color characteristic suitable for the color reproduction characteristic of the display device displaying the video signal is obtained. Can be converted to data.

[Second Embodiment] Next, another embodiment in which a gamma value adjusting switch and a gamma value holding circuit are added to the configuration of the image processing apparatus of the above-mentioned embodiment will be described. The parts common to those in FIG. 3 are indicated by the same numbers.

As shown by inputs 1 and 2, as shown in FIG. 5, two kinds of input signals are applied to the input changeover switch 8. First, when the input 1 is selected by the input switching signal 13, the microprocessor 12 writes the default gamma value in the gamma table 9. However, when this gamma value is not the optimum value for the user, the gamma adjustment switch 15 instructs the fine adjustment of the gamma value. The microprocessor 12 uses the adjustment switch 15
The contents of the gamma conversion table 9 are rewritten according to the adjustment value. As a result, the user can obtain the optimum color reproduction for the input 1.

Next, when the changeover switch 8 is changed over by the input changeover signal 13 so as to select the signal from the input 1 to the input 2, the user performs the same process as the above-mentioned process with respect to the input 2. Find the optimum color reproduction. In a device in which the gamma table 9 and the gamma adjustment switch 15 are commonly used, such as the device of the present embodiment, the user must repeatedly perform this operation for switching the input. To deal with this, a gamma value holding circuit 16 is added to a part of the gamma table 9 to hold an optimum gamma adjustment value corresponding to the previous input data. Then, when the change-over switch 8 is switched, the microprocessor 12 reads the contents set in the gamma value holding circuit 16 and changes the contents of the gamma conversion table 9 in accordance with the contents and the selected input signal. change. As a result, even if the changeover switch 8 is repeatedly changed, the optimum gamma value is immediately set in the table 9.

This processing is shown in the flowchart of FIG. 6, and the control program for executing this processing is the ROM 12b.
And is executed under the control of the microprocessor 12.

First, in step S11, it is checked whether or not the gamma value adjusting switch 15 is operated, and if it is operated, the process proceeds to step S12, and the contents of the gamma conversion table 9 are changed according to this operation. In step S13, the signal level of the input switching signal 13 is checked to see if the input switching switch 8 has been switched. When the changeover switch 8 is switched, the process proceeds to step S14, and the gamma correction value currently set in the gamma conversion table 9 is set in the gamma value holding circuit 16. Next, in step S15, it is determined whether or not a gamma correction value suitable for the input switched this time is already stored in the gamma value holding circuit 16, and if it is stored, the process proceeds to step S16.
The gamma value held in the gamma value holding circuit 16 is read out and set in the gamma conversion table 9. on the other hand,
If the previous set value is not stored, step S17
Then, the predetermined gamma correction value is stored in the gamma conversion table 9 as in step S3 or step S5 of FIG.

As described above, according to the present embodiment, when the input selector switch is switched and the input video signal is switched, the gamma correction value suitable for it can be immediately set and the optimum adjustment can be made by the user. Since the adjusted value can be saved and set, every time the input is switched,
Eliminates the need for troublesome fine adjustments many times.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. The present invention can also be applied to the case where it is achieved by supplying a program for implementing the present invention to a system or an apparatus.

The above-mentioned TV video card 1 or W
The output characteristic of the video signal of the S video card 4 is not limited to the above-described embodiment, and the TV video signal may be a linear characteristic, or the output characteristic of each video card is the above-mentioned. It may have other characteristics different from those of the embodiment. The point is that the characteristics of the video signals output from these video cards may be adapted to the output characteristics of the display device 11 actually used.

As described above, according to this embodiment, the following effects can be obtained by setting the input video data that has been switched and selected and performing the inverse gamma correction process in consideration of the characteristics of the output device. To be (1) It is possible to perform optimum color conversion processing that does not depend on the state of the selected input video data, and it is possible to flexibly deal with switching of a plurality of types of input video sources. (2) By holding the inverse gamma correction data before the switching for two or more types of switching, it is not necessary to repeatedly perform the inverse gamma correction adjustment for each input switching, and the input switching is performed many times. It is possible to provide the user with a comfortable operating environment. (3) A single common display interface can deal with the inverse gamma processing of a plurality of types of input video sources, and a display interface suitable for each type of video signal is provided. A significant cost reduction can be achieved as compared with the conventional method.

[0037]

As described above, according to the present invention, the video signal which is switched and selected can be converted and displayed according to the display characteristics of the display section.

Further, according to the present invention, the input image signal can be converted according to the display characteristics of the display section or the display device.

Furthermore, according to the present invention, a single conversion circuit can be used to convert an image signal suitable for various image signals.

Further, according to the present invention, the previously changed conversion data is stored in correspondence with the input image signal, and when the image signal is selected, the stored conversion data is stored. Is read out and set as conversion data, which has the effect of enabling high-speed response to input switching of image signals.

[0041]

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an image processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an inverse gamma correction process of gamma correction data according to this embodiment.

FIG. 3 is a diagram illustrating linear gamma correction processing according to the present exemplary embodiment.

FIG. 4 is a flowchart showing processing of the image processing apparatus of the first embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an image processing apparatus according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing the processing of the second embodiment of the present invention.

[Explanation of symbols]

 1 TV video card 2 NTSC signal generation source 3 RGB digital conversion circuit 4 WS video card 5 Analog video signal generation source 6 Linear A / D conversion circuit 7 Display interface section 8 Input selector switch 9 Gamma conversion table 10 Image processing circuit 11 Display Device 12 Microprocessor 12a, 12b ROM 13 Input Switching Signal 14 Bus 15 Gamma Value Adjustment Switch 16 Gamma Value Holding Circuit

Claims (13)

[Claims] 1. A display control device for switching and inputting a plurality of image signals and outputting the same to a display device, comprising: selecting means for switching and selecting image signals to be input according to a switching signal; and selecting by the selecting means. Conversion means for converting the color characteristics of the image signal obtained according to the conversion data, and control for changing the conversion data according to the switching signal so that the conversion characteristics in the conversion means are adapted to the color reproduction characteristics of the display device. And a display control device. 2. The storage device further comprises storage means for storing a default value of the conversion data, wherein the control means reads out and sets the conversion data corresponding to the image signal selected by the selection means from the storage means. Claim 1 characterized by
The display control device according to 1. 3. The display control device according to claim 1, wherein the conversion data is gamma correction data. 4. The display control device according to claim 1, further comprising an instruction unit for instructing to change the conversion data. 5. The conversion data storage means for storing the conversion data according to the image signal selected by the selection means is further provided, and the control means is instructed to switch the image signal by the switching signal. The display control device according to claim 1, wherein the conversion data stored in the conversion data storage unit is read and set in the conversion unit. 6. A display control method for switching and inputting a plurality of image signals to output to a display device, the step of switching and selecting an image signal to be input according to a switching signal, and the selected image signal. A conversion step of converting the color characteristics of the conversion data in accordance with the conversion data, and a step of changing the conversion data according to the switching signal so that the conversion characteristics in the conversion step match the color reproduction characteristics of the display device. A display control method characterized by the above. 7. The display control method according to claim 6, wherein the conversion data is gamma correction data. 8. A step of storing the conversion data according to a selected image signal, and when the switching signal instructs switching of the image signal, the stored conversion data is read out and conversion of the conversion step is performed. The display control method according to claim 6, further comprising a step of setting as data. 9. A display device for switching and inputting a plurality of image signals and displaying the same on a display unit, comprising: selecting means for switching and selecting image signals to be input according to a switching signal; and selecting means by the selecting means. Conversion means for converting the color characteristics of the image signal according to the conversion data, and control means for changing the conversion data according to the switching signal so that the conversion characteristics of the conversion means are adapted to the color reproduction characteristics of the display section. A display device having: 10. The storage device further comprises a storage unit for storing a default value of the conversion data, wherein the control unit reads out the conversion data according to the image signal selected by the selection unit from the storage unit and sets the conversion data. The display device according to claim 9, wherein the display device is a display device. 11. The display device according to claim 9, wherein the conversion data is gamma correction data. 12. The display device according to claim 9, further comprising an instruction unit for instructing to change the conversion data. 13. The conversion data storage means for storing the conversion data in accordance with the image signal selected by the selection means, wherein the control means is instructed to switch the image signal by the switching signal. 10. The display device according to claim 9, wherein the conversion data stored in the conversion data storage unit is read out and set in the conversion unit.