JPH04342373A - Method and device for controlling picture quality level of television receiver - Google Patents

Abstract

PURPOSE:To obtain a picture quality level corresponding to a visual environment by using fuzzy inference based on illuminance data and visual distance data concerning brightness around a television receiver. CONSTITUTION:A photodetector 5 detects the brightness around the television receiver and generates an illuminance data signal. A remote control transmitter 7 is equipped with a switch 8 to input the visual and audible distance data and transmits a visual and audible distance data signal in the form of an optical signal. A memory 13 stores the table of picture quality level control data concerning the picture quality level corresponding to the illuminance and the visual and audible distance prepared in advance by using the fuzzy inference. A microcomputer 6 receives the illuminance data signal from the photodetector 5 and the visual and audible distance data signal from the remote control receiver 11. Then, the picture quality level control data corresponding to the values of these both data are read from the memory 13 and supplied through a D/A converter 14 to a picture quality level control circuit 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the picture quality level of a television receiver and an apparatus embodying the method.

0002

2. Description of the Related Art Adjustment of the image quality level of a television receiver involves controlling a wide-band filter provided in the video signal system, which influences the fineness of the image displayed on the television receiver.

[0003] When the image quality level is high, the image is reproduced in fine detail, giving a visually hard impression, and when the image quality level is low, the fine details are not reproduced, giving the impression of being soft. Conventionally, the image quality level of television receivers has been set in advance by the manufacturer, or has been adjusted by the user to suit his/her preference.

However, the image quality level depends on the user's preference and is greatly influenced by the viewing environment. That is, the preferred image quality level changes in a complicated manner depending on the brightness and temperature around the television receiver, the viewing distance taken by the user, etc.

[0005] Therefore, when considering the surrounding brightness, viewing distance, and image quality level in this viewing environment, first of all, when the surroundings are bright or the viewing distance is far, it is better to set the image quality slightly harder. is clearly felt. On the other hand, when the surroundings are dark or the viewing distance is short, a hard image quality will make the image appear more glaring, which is undesirable, but a slightly softer image quality will give the viewer a calmer impression, making it easier for the viewer to see. The relationship between ambient brightness, viewing distance, and image quality level is more closely related to human senses, but this relationship is complex when the surroundings are bright and the viewing distance is short, or when the surroundings are dark and the viewing distance is long. etc., it is difficult to set the image quality level.

[0006]

[Problems to be Solved by the Invention] As mentioned above, the image quality level needs to be delicately adjusted depending on the brightness around the television receiver, the viewing distance taken by the viewer, etc., but in the past, the image quality level was set by the manufacturer. It is either fixed or manually adjusted by the viewer, depending on the viewer's environment (surrounding brightness, viewing distance).
Even if the image quality changes, it is not possible to adjust the image quality level immediately in response to the change.

Furthermore, since the relationship between the viewing environment and the image quality level is complicated, it is difficult for the viewer to manually obtain the image quality level that corresponds to the viewing environment.

[0008]

[Means for Solving the Problems] The present invention was invented in view of the drawbacks of the above-mentioned conventional devices, and it provides illuminance data regarding the brightness around the television receiver detected by a photodetector and the above-mentioned television receiver. By using fuzzy inference based on viewing distance data regarding the viewing distance between the television receiver and the viewer, the viewing environment including the brightness around the television receiver and the viewing distance between the television receiver and the viewer can be A method for adjusting the image quality level of a television receiver that automatically adjusts the image quality level according to the image quality, and a light detection method that detects the light surrounding the television receiver and converts it into an illuminance signal indicating the illuminance around the television receiver. a viewing distance data signal generator that outputs a viewing distance signal indicating the viewing distance between the television receiver and the viewer; illuminance data regarding the brightness around the television receiver; and the television receiver and the viewer. a memory storing image quality level adjustment data that is a table showing the relationship between viewing distance data and viewing distance data; and an illuminance signal obtained from the photodetector and a viewing distance signal obtained from the viewing distance data signal generator. reading means for reading image quality level adjustment data from the memory according to the relationship between the illuminance indicated by the illuminance signal and the viewing distance indicated by the viewing distance signal; The present invention provides an image quality level adjustment device for a television receiver, which comprises an image quality level adjustment circuit that adjusts the image quality level of a video signal in a television signal.

The present invention also provides an image quality level adjustment device for a television receiver, wherein the image quality level adjustment data stored in the memory is data that is a table of the relationship between the illuminance data and viewing distance data created using fuzzy inference. In addition, the above-mentioned viewing distance signal generator also provides an image quality level adjustment device constituted by a remote control transmitter/receiver.

0010

[Operation] Therefore, according to the present invention, by using fuzzy inference based on the brightness around the television receiver detected by the built-in photodetector and the viewing distance input by the user, the user's viewing The preferred image quality level is automatically set according to the environment, and the preferred image quality level can be obtained without requiring troublesome adjustments by the user.

[0011] Furthermore, since the user can input the viewing distance using the remote control transmitter/receiver, the image quality level adjustment device is extremely easy to use.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external perspective view of a television receiver equipped with an embodiment of a picture quality level adjustment device embodying the picture quality level adjustment method for a television receiver according to the present invention;
Figure 2 is a block electrical circuit diagram of the device.
2 is the main body of the television receiver, and 2 is a video signal processing circuit that is generally included in television receivers, and after performing various processing on the video signal of the television signal input from the antenna (not shown). , and supplies the video signal to the next-stage image quality level adjustment circuit 3. This image quality level adjustment circuit 3 plays the role of a wide frequency filter for the video signal. 4 is a cathode ray tube.

Reference numeral 5 denotes a photodetector consisting of a photodiode or the like provided on the front surface of the main body 1, which detects the light surrounding the television receiver and generates an electric signal corresponding to its brightness, that is, illuminance data. This illuminance data signal is converted into a digital signal by an A/D converter (not shown) provided in the middle of the reading means constituted by the microcomputer 6, and is inputted.

7 is a remote control transmitter,
In addition to the usual power switch, channel selection switch, volume knob, etc., a switch 8 for inputting viewing distance data related to the present invention is provided. That is, when the viewer presses the switch 8, the distance display on the display 10 changes up and down at intervals of 10 cm, for example, in proportion to the pressing time, and the value changes to a desired value (between the viewer and the television receiver). When the transmitter switch 9 is operated when the distance to the television receiver is reached, the viewing distance data signal displayed on the display 10 at that time is transmitted from the remote control transmitter 7 in the form of an optical signal, and the distance is transmitted to the main body of the television receiver. The signal is received by the light receiving section 12 of the remote control receiver 11 provided on the front side of the remote control receiver 11.

The remote control receiver 11 converts the viewing distance data signal received by the light receiving section 12 into a digital electrical signal again and supplies it to the microcomputer 6. Reference numeral 13 denotes a memory, which contains illuminance data indicating the brightness around the television receiver and data indicating the relationship between the viewing distance data and the image quality level of the television receiver, which have been created in advance using fuzzy inference, i.e., illuminance. and image quality level adjustment data regarding the image quality level according to the viewing distance are stored in a table (see FIG. 3), and the illuminance data signal from the photodetector 5 and the remote control receiver 11 are stored through the microcomputer 6. The reading means of the microcomputer 6 reads out image quality level adjustment data corresponding to the values of both data, and the image quality level adjustment data is read out by the reading means of the microcomputer 6 and sent to the image quality level adjustment circuit 3 via the D/A converter 14. supplied to

FIGS. 4 to 6 show membership functions related to illumination, distance, and image quality level adjustment data to the D/A converter necessary to obtain the data table shown in FIG. 3 using fuzzy inference. FIG. 7 is a diagram showing a rule table showing the relationship between them.

Since the present invention is configured as described above, when a viewer needs to adjust the image quality level of the video screen while watching a television program on a television receiver, the viewer can use the remote control. It is best to press the switch 8 on the transmitter 7 while looking at the display 10.

That is, by pressing the switch 8, the distance display on the display 10 changes at intervals of 10 cm, and when the distance display reaches the distance between the viewer and the television receiver, the switch 8 is stopped being pressed. , then operate the transmission switch 9.

Then, by operating this switch 9, the viewing distance data signal regarding the distance display displayed on the display 10 (actually stored in memory means such as an up/down counter) is transmitted from the remote control transmitter 7. The signal is received by the light receiving section 12 on the receiver side and supplied to the microcomputer 6.

At this time, the microcomputer 6 reads image quality level adjustment data from the memory 13 in accordance with the relationship between the illuminance data signal obtained from the photodetector 5 and the viewing distance data signal received by the remote control receiver 11. The readout data is supplied to the image quality level adjustment circuit 3 via the D/A converter 14, and the image quality level of the video screen displayed on the cathode ray tube 4 is adjusted.

[0021]

[Effects of the Invention] Since the present invention is configured as described above, it is possible to automatically obtain the optimum image quality level according to the brightness around the television receiver and the distance between the television receiver and the viewer. Can be done. Further, if viewing distance data indicating the distance between the television receiver and the viewer is inputted using a remote control transmitter/receiver, the adjustment of the image quality level described above becomes even easier.

[Brief explanation of drawings]

FIG. 1 is a perspective external view of a television receiver equipped with an image quality level adjustment device according to the present invention.

FIG. 2 is a block electrical circuit diagram of a device embodying the method for adjusting the picture quality level of a television receiver according to the present invention.

FIG. 3 is a diagram showing image quality level adjustment data obtained as a result of fuzzy inference.

FIG. 4 is a diagram showing a membership function related to illumination around a television receiver for obtaining image quality level adjustment data.

FIG. 5 is a diagram showing a membership function related to viewing distance of a viewer for obtaining image quality level adjustment data.

FIG. 6 is a diagram showing membership functions regarding image quality levels for obtaining image quality level adjustment data.

FIG. 7 is a diagram showing rules for each input/output membership function of illuminance, viewing distance, and image quality level.

[Explanation of symbols]

1 Main body of the television receiver 3 Image level adjustment circuit 4 Cathode ray tube 5 Photodetector 6. Microcomputer 7 Remote control transmitter 11 Remote control receiver 13 Memory

Claims (4)

[Claims] 1. A method for adjusting the image quality level of a television receiver, the method comprising: illuminance data regarding the brightness around the television receiver detected by a photodetector;
By using fuzzy inference based on the viewing distance data regarding the viewing distance between the television receiver and the viewer, the viewing distance including the brightness around the television receiver and the viewing distance between the television receiver and the viewer is calculated. A method for adjusting the picture quality level of a television receiver that automatically adjusts the picture quality level according to the environment. 2. A light for adjusting the picture quality level of a television receiver, which detects light around the television receiver and converts it into an illuminance data signal indicating the illuminance around the television receiver. a detector, a viewing distance data signal generator that outputs a viewing distance data signal indicating the viewing distance between the television receiver and the viewer, and illuminance data regarding the brightness around the television receiver; a memory storing image quality level adjustment data in which a relationship with viewing distance data regarding viewing distances between viewers is made into a table, and an illuminance data signal obtained from the photodetector and the viewing distance data signal obtained from the viewing distance data signal generator. a reading means for receiving the viewing distance data signal and reading from the memory image quality level adjustment data according to the relationship between the illuminance indicated by the illuminance data signal and the viewing distance indicated by the viewing distance data signal; An image quality level adjustment device for a television receiver, comprising an image quality level adjustment circuit that adjusts the image quality level of a video signal in a television signal according to image quality level adjustment data. 3. The image quality level adjustment data stored in the memory is data that is a table of the relationship between the illuminance data and viewing distance data created using fuzzy inference. Image quality level adjustment device for television receivers. 4. The picture quality level adjustment device for a television receiver according to claim 2, wherein the viewing distance signal generator is constituted by a remote control transmitter/receiver.