JP2002108266A - Device and method for displaying picture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture display device permitting the adjustment of brightness and contrast of a display picture by an operation other than that of an input picture signal. SOLUTION: Look-up table data are made alterable by arranging a look-up table 11 in which the data can be re-written, and a look-up table correction part 13 for correcting the data in this look-up table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image display device and an image display method.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a configuration of a conventional image display device. The adjustment of the brightness (brightness) and the density (contrast) of the conventional image display device is performed by adjusting the input image signal itself in the image signal processing unit 4. The LCD control unit 2 that controls the LCD (liquid crystal display) 1 determines the pixel value of the output image with respect to the pixel value of the input image with reference to the look-up table 3 and outputs it to the LCD 1.

Further, as a conventional technique having means for changing look-up table data, for example, Japanese Unexamined Utility Model Publication No.
In the apparatus disclosed in Japanese Patent No. 61794, a plurality of look-up tables storing data having different gradations are prepared, and one of them is selected.

[0004]

However, in the conventional image display device, adjustment of brightness and contrast of an image to be displayed is performed only by directly operating an input image signal. In the technology disclosed in Japanese Utility Model Laid-Open No. 5-61794, a plurality of look-up tables having different gradations can be selectively selected.
This is to adjust the viewing angle with respect to the liquid crystal panel, not to adjust brightness and contrast.

[0005] The present invention has been made in view of the above points, and is intended to reduce the brightness and contrast of an image to be displayed.
It is an object of the present invention to provide an image display device and an image display method that can be adjusted by an operation other than an input image signal.

[0006]

According to the present invention, there is provided an image display apparatus comprising: a look-up table capable of rewriting data; a density of each pixel of an input image converted by using the look-up table; Display control means for displaying, an interface means for outputting a correction level according to the image intensity change instruction from the user, and an offset value based on the intensity correction level from the interface means. And a look-up table correction means for outputting the obtained offset value to the display control means, wherein the display control means uses the data of the lookup table based on the offset value from the look-up table correction means. Adopt a configuration that changes

According to this configuration, the brightness of the image can be adjusted by an operation other than the input image signal.

Further, in the image display device according to the present invention, in the image display device described above, the look-up table correcting means includes:
When there is an image density change instruction from the user and a correction level corresponding to the instruction is input from the interface means, the dynamic range correction value of the pixel value after density conversion by the look-up table is based on the correction level. The obtained dynamic range correction value is output to the display control means, and the display control means changes the data of the lookup table based on the dynamic range correction value from the lookup table correction means.

According to this configuration, the contrast of the image can be adjusted by an operation other than the input image signal.

Further, the image display device of the present invention, in the above-mentioned image display device, comprises a look-up table data storage means for storing a plurality of look-up table data, and the look-up table correction means is provided for controlling the brightness of the image by the user. When there is an instruction to change the degree and shade, one of the plurality of lookup table data stored in the lookup table data storage means is selected and displayed based on the correction level according to the instruction. Output to the control means,
The display control means changes the current data of the look-up table to the data from the look-up table correction means.

According to this configuration, it is possible to simultaneously adjust the brightness and contrast of an image by an operation other than the input image signal.

Further, according to the image display device of the present invention, in the above-mentioned image display device, an image data storage means for storing an image frame of input image data, Input side frequency distribution measuring means for measuring the frequency distribution of, and output side frequency measuring means for measuring the frequency distribution of each pixel from the display data output from the display control means, the lookup table correction means, A configuration is adopted in which the data of the lookup table is changed based on the frequency distribution obtained by the input-side frequency distribution measuring means and the output-side frequency distribution measuring means.

According to this configuration, the brightness and contrast of the image are simultaneously and automatically adjusted even if an image having significantly different brightness and contrast is input to the image once adjusted by the user. It is possible to maintain the displayed level.

In the image display device according to the present invention, the image data storage means stores a plurality of image frame data at fixed intervals, and the input-side frequency distribution measurement means stores the image data storage data. The average value of the frequency distribution of each pixel is calculated from a plurality of image frame data stored in the means.

According to this configuration, even if an image having a significantly different brightness and contrast is input to the image once adjusted by the user, the brightness and the contrast can be automatically adjusted simultaneously at a constant interval. The display level adjusted by the user can be always maintained.

A mobile station device according to the present invention employs a configuration including the above-described image display device.

According to this configuration, it is possible to provide a mobile station device that can adjust the brightness and contrast of an image to be displayed by an operation other than the input image signal.

A base station apparatus according to the present invention employs a configuration including the image display device.

According to this configuration, it is possible to provide a base station apparatus that can adjust the brightness and contrast of an image to be displayed by an operation other than the input image signal.

According to the image display method of the present invention, the density of each pixel of the input image is converted using a look-up table in which data can be rewritten, and the converted image is displayed on a display. In this case, a correction level corresponding to the instruction is generated, an offset value is obtained based on the correction level, and the data of the lookup table is changed based on the obtained offset value.

Further, according to the image display method of the present invention, the density of each pixel of the input image is converted by using a look-up table in which data can be rewritten and displayed on a display device. If there is, a correction level corresponding to the instruction is generated, a dynamic range correction value of the pixel value after the density conversion by the look-up table is obtained based on the correction level, and the obtained dynamic range correction value is obtained. The data of the lookup table is changed based on

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention is to provide a look-up table in which data can be rewritten, and a look-up table correcting means for correcting the data in the look-up table, and arbitrarily change the look-up table data. Is to be able to do it.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of an image display device according to Embodiment 1 of the present invention. In this figure, the image display device according to the present embodiment has an LCD (Liquid Crystal Display) 1 for displaying an image and a lookup table 11 capable of offset adjustment. LCD control unit 1 for converting the density of each pixel of the image and displaying on LCD 1
0, when the user instructs to change the brightness of the image, the interface unit 12 that outputs a correction level corresponding to the instruction, and a look-up based on the correction level of the brightness of the image from the interface unit 12. A look-up table corrector 13 is provided for obtaining an offset correction value for adding or subtracting the entire value of the up table 11 and outputting the obtained offset correction value to the LCD controller 10.

In such a configuration, when an image is displayed on the LCD 1, the user inputs an instruction to determine the desired brightness of the image, and the
The correction level of the brightness of the image is output to the lookup table correction unit 13. The lookup table correction unit 13 calculates an offset correction value for adding or subtracting the entire value of the lookup table 11 based on the input correction level of the brightness, and outputs the offset correction value to the LCD control unit 10. L
The CD control unit 10 changes the look-up table 11 based on the input offset correction value. Thereby, the brightness of the image desired by the user is set.

As described above, according to the present embodiment, the brightness of an image can be adjusted by an operation other than the input image signal.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of an image display apparatus according to Embodiment 2 of the present invention. In this figure, the same parts as those in FIG. 1 described above are denoted by the same reference numerals.

The look-up table correction unit 13 receives a density change by the look-up table 11 based on a correction level according to the instruction from the user through the interface unit 12 when the user changes the density of the image. , And outputs the obtained dynamic range correction value to the LCD control unit 10. LC
The D control unit 10 changes the data of the lookup table 11 based on the dynamic range correction value from the lookup table correction unit 13.

In such a configuration, when an image is displayed on the LCD 1, the user inputs an instruction to determine a desired image density, and the correction level of the image density is looked up from the interface unit 12. Output to the table correction unit 13. Lookup table correction unit 1
3 determines a dynamic range correction value of the pixel value after density conversion by the look-up table 11 based on the input gray level correction level,
Output to The LCD control unit 10 changes the look-up data based on the input dynamic range correction value. Thereby, the density of the image desired by the user is set.

As described above, according to the present embodiment, it is possible to adjust the contrast of an image by an operation other than the input image signal.

(Embodiment 3) FIG. 3 is a block diagram showing a configuration of an image display apparatus according to Embodiment 3 of the present invention. Note that, in this figure, the same parts as those in FIG. 1 described above are denoted by the same reference numerals.

The image display device of the present embodiment has a look-up table storage unit 14 for storing a plurality of look-up table data. When the user issues an instruction to change the lightness and darkness of the image, the look-up table correction unit 13 uses a plurality of look-up tables stored in the look-up table storage unit 14 based on the correction level according to the instruction. An optimum one is selected from the up-table data and output to the LCD control unit 10. The LCD control unit 10
The data of the lookup table 11 is changed to the data from the lookup table correction unit 13.

In such a configuration, when the user inputs an instruction to determine the desired image brightness and shading at an arbitrary timing with respect to the image displayed on the LCD 1, the image brightness of the image is transmitted from the interface unit 12. The correction levels of the degree and the shading are output to the look-up table correction unit 13. The look-up table correction unit 13 selects one of the plurality of look-up table data stored in the look-up table storage unit 14 based on the input correction level, and selects one of the plurality of look-up table data. 13 is output. The LCD control unit 13 changes the currently held look-up table data to the inputted look-up table data.

Here, the lookup table correction unit 13
As a criterion for selecting the look-up table data at, referring to the offset correction value and the dynamic range of the output signal in each look-up table data,
One look-up table data closest to the corrected look-up table is selected. Thereby, the brightness and the shading of the image desired by the user are set.

As described above, according to the present embodiment, it is possible to simultaneously adjust the brightness and contrast of an image by an operation other than the input image signal.

(Embodiment 4) FIG. 4 is a block diagram showing a configuration of an image display apparatus according to Embodiment 4 of the present invention. Note that, in this figure, the same parts as those in FIG. 1 described above are denoted by the same reference numerals.

The image display device according to the present embodiment measures an image data storage unit 15 for storing an image frame of input image data and a frequency distribution of each pixel from the image frame stored in the image data storage unit 15. The input-side frequency distribution measuring unit 16 and the output-side frequency measuring unit 1 that measures the frequency distribution of each pixel from the display data output from the LCD control unit 10.
7 is provided.

The look-up table correction unit 13 changes the data of the look-up table 11 based on the frequency distribution obtained by the input-side frequency distribution measuring unit 16 and the output-side frequency distribution measuring unit 17. The image data storage unit 15 stores a plurality of image frame data at regular intervals.

In such a configuration, when the user adjusts to the ideal look-up table using the interface unit 12, and then inputs moving image data, the image data composed of image frames is converted into image data for each frame. It is stored in the storage unit 15. The input-side frequency distribution measuring unit 16
The frequency distribution of each pixel is calculated from the image frame data stored in the image data storage unit 15 and output to the lookup table correction unit 13. Similarly, LC for each frame
The display data output from the D control unit 10 is subjected to a frequency distribution calculation by the output-side frequency distribution measurement unit 17, and is output to the look-up table correction unit 13.

The look-up table correction unit 13 calculates difference data of brightness and contrast between the input frequency distribution and the output frequency distribution by using the two input frequency distributions, and uses the calculated data as a correction value as an LCD control unit. Output to 10 The LCD control unit 10 controls the look-up table 11 based on the input correction value of the look-up table 11.
Make changes.

As described above, according to the present embodiment, even if an image having a large difference in brightness and contrast is input to an image once adjusted by the user, the brightness and contrast are simultaneously and automatically adjusted. ,
The display level adjusted by the user can be held.

(Embodiment 5) FIG. 5 is a block diagram showing a configuration of an image display apparatus according to Embodiment 5 of the present invention. In this figure, the same parts as those in FIG. 4 are denoted by the same reference numerals.

The image display device of the present embodiment includes an image data storage unit 18 for storing a plurality of image frame data, and the input-side frequency distribution measuring unit 16 calculates a frequency distribution of each image from the plurality of image frame data. Has the function of calculating the average value of

In such a configuration, after the user adjusts to the ideal look-up table using the interface unit 12, when the moving image data is input, the image data composed of the image frames of the moving image is transmitted at regular intervals. The image data is stored in the image data storage unit 18. Input side frequency distribution measurement unit 16
Calculates the average of the frequency distribution of each pixel from a plurality of image frame data stored in the image data storage unit 15,
Output to the look-up table correction unit 13. Similarly 1
The display data output from the LCD control unit 10 for each frame is also calculated by the output-side frequency distribution measurement unit 17 for the frequency distribution, and is output to the look-up table correction unit 13.

The lookup table correction unit 13 calculates difference data of brightness and contrast between the input frequency distribution and the output frequency distribution using the two input frequency distributions, and sends the data to the LCD control unit 10 as correction values. Output.
The LCD control unit 10 changes the look-up table 11 based on the input correction value of the look-up table 11.

As described above, according to the present embodiment, even if an image having a large difference in brightness and contrast is input to an image once adjusted by the user, the brightness and contrast are automatically adjusted simultaneously at a constant interval. Therefore, the display level adjusted by the user can be held.

It is needless to say that the image display device of each of the above embodiments can be used for various electronic devices such as a personal computer, a liquid crystal television, and a car navigation system in addition to a mobile station device and a base station device of a mobile communication system. .

[0048]

As described above, according to the present invention,
Since the brightness and contrast of the image in the liquid crystal display device can be adjusted by changing the data in the look-up table, the image input sources to the liquid crystal display device can be diversified.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of an image display device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an image display device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an image display device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an image display device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a conventional image display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display 10 LCD control part 11 Lookup table 12 Interface part 13 Lookup table correction part 14 Lookup table data storage part 15, 18 Image data storage part 16 Input side frequency distribution measuring part 17 Output side frequency distribution measuring part

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tadashi Kayada 3-1-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa F-term (reference) in Matsushita Communication Industrial Co., Ltd. 5C006 AF46 AF52 BF49 FA54 FA56 5C080 AA10 DD30 EE29 EE32 JJ02

Claims (9)

[Claims] 1. A look-up table in which data can be rewritten, display control means for converting the density of each pixel of an input image using the look-up table and displaying the result on a display device, An interface means for outputting a correction level according to the change instruction when there is a change instruction; and an offset value obtained based on the correction level of the brightness from the interface means, and transmitting the obtained offset value to the display control means. An image display device comprising: a look-up table correcting unit for outputting; and the display control unit changes data of the look-up table based on an offset value from the look-up table correcting unit. 2. A look-up table correcting means, which receives an image density change instruction from a user and, when a correction level corresponding to the instruction is input from an interface means, uses a look-up table based on the correction level. A dynamic range correction value of the pixel value after the density conversion is obtained, and the obtained dynamic range correction value is output to the display control means.The display control means, based on the dynamic range correction value from the lookup table correction means, 2. The image display device according to claim 1, wherein data of the lookup table is changed. 3. Lookup table data storage means for storing a plurality of lookup table data,
The look-up table correction means, when a user instructs to change the lightness and darkness of the image, a plurality of look-up tables stored in the look-up table data storage means based on a correction level corresponding to the instruction. 4. The method according to claim 1, wherein one of the table data is selected and output to the display control means, and the display control means changes the current data of the look-up table to the data from the look-up table correction means. The image display device according to claim 1. 4. An image data storage means for storing an image frame of input image data, an input-side frequency distribution measuring means for measuring a frequency distribution of each pixel from the image frame stored in the image data storage means, Output frequency measuring means for measuring the frequency distribution of each pixel from the display data output from the display control means, wherein the look-up table correcting means comprises: the input frequency distribution measuring means; and the output frequency distribution measuring means. 4. The image display device according to claim 1, wherein data of the look-up table is changed based on the frequency distribution obtained. 5. The image data storage means stores a plurality of image frame data at a fixed interval, and the input-side frequency distribution measuring means calculates each pixel from the plurality of image frame data stored in the image data storage means. The image display device according to claim 4, wherein an average value of a frequency distribution is calculated. 6. A mobile station device comprising the image display device according to claim 1. Description: 7. A base station device comprising the image display device according to claim 1. Description: 8. A method for converting the density of each pixel of an input image using a look-up table in which data can be rewritten and displaying the converted image on a display unit. Generate a correction level according to the instruction,
An image display method comprising: obtaining an offset value based on the correction level; and changing data in the look-up table based on the obtained offset value. 9. A method for converting the density of each pixel of an input image using a look-up table capable of rewriting data and displaying the converted image on a display device. Generate a correction level according to the instruction,
Based on the correction level, a dynamic range correction value of the pixel value after the density conversion by the look-up table is obtained,
An image display method, wherein data of the look-up table is changed based on the obtained dynamic range correction value.