JPH0614711B2 - Television receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a television receiver having a function of staticizing an image by digitizing a video signal, writing the video signal in a memory, and repeatedly reading the video signal.

<Prior Art> Conventionally, in a television receiver of this type, when a user shifts to a screen still mode by operating a still image button,
The screen at that moment is displayed as a still image on the large screen B, or as a still image on the small screen C, as in the two-screen method shown in FIG. There is something to do.

However, in such a conventional television receiver,
What is displayed as a still image is an image of the entire screen at the moment when the still image button is operated, and an arbitrary portion required by the user according to the program, for example, a telop indicating the address to which the quiz program is applied. It is not possible to specify a part such as a character and display only that part as a still image.

Therefore, if you want to make the entire screen a still image,
Even if the image on the entire screen does not necessarily have to be a still image, it will still be a still image, and there is the difficulty that the progress status of the program cannot be known during playback of the still image. In the two-screen system, a part of the still image displayed as the large screen B such as telop characters is small screen C.
Therefore, there is a problem in that a telop character or the like required for reducing the still image as the small screen C is difficult to see due to the lack of the image.

<Object of the Invention> An object of the present invention is to solve the above technical problem by displaying an arbitrary portion of an image as a still image.

<Structure of the Invention> In order to achieve the above object, the present invention is a television receiver having a still image function for displaying an arbitrary portion of an image as a still image, for designating the arbitrary portion. And the operation unit that is operated to
A / D conversion circuit, a display memory to which image data from the A / D conversion circuit is written and read, and an index signal for displaying an index indicating a boundary of a portion designated according to the operation on the screen. An index signal output circuit for outputting, a switching circuit for switching and outputting the image data read from the display memory and the index signal, and an output of the switching circuit is D
D / A conversion circuit for A / A conversion, and control means for performing writing / reading control of the display memory, output control of the index signal output circuit, and switching control of the switching circuit based on the output of the operation unit and the video signal. In the screen still mode, the control means sequentially writes and reads image data corresponding to a portion other than the set arbitrary portion to the display memory to update the data,
The image data corresponding to the arbitrary portion is repeatedly read without being updated, so that the still image of the arbitrary portion is displayed.

According to the above configuration, when the user specifies the portion to be displayed as a still image, in the screen still mode,
The data in that portion is not updated and is displayed as a still image, and in the other portions, the data is updated and a moving image is displayed.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a main part of one embodiment of the present invention. The television receiver of this embodiment has a still image function, and moreover, the user can specify an arbitrary part of the image. , Only that part is displayed as a still image, and the rest part is a normal video.
It has the following configuration.

That is, an A / D conversion circuit 2 for digitizing a video signal from the video input terminal 1, a field memory 3 to which image data from the A / D conversion circuit 2 is written and read, and an image to be displayed as a still image. And an index signal output circuit 5 for outputting an index signal for displaying an index indicating the boundary of the specified part on the screen according to this operation. , A switching circuit 6 for switching and outputting the image data read from the field memory 3 and the index signal, a D / A conversion circuit 7 for D / A converting the output of the switching circuit 6, and an output of the operating section 4. And a control means 8 for performing writing / reading control of the field memory 3, output control of the index signal output circuit 5 and switching control of the switching circuit 6 based on the video signal.

Similar to the conventional example, the operation unit 4 is provided with a still image button that is operated when the screen still mode is set, and further, in this embodiment, as shown in FIG. 2, a still image is displayed. 2 when specifying any part of the image
A display button for displaying one of the indexes 9a and 9b at the left end of the screen, and a designation button for arbitrarily designating the portion to be displayed as a still image by moving the indexes 9a and 9b individually in the vertical direction, etc. The image of the portion A between the two indexes 9a and 9b is displayed as a still image as described later.

The control unit 8 includes a CPU, a program ROM, a work RAM, and the like, and based on an operation signal and a video signal from the operation unit 4, writing of image data to the field memory 3, read-out control, and an index signal output circuit 5. The output timing of the index signal from and the switching control of the switching circuit 6 are performed.

When the display button of the operation unit 4 is operated, the control means 8
The index signal output circuit 5 outputs the index signal, the switching circuit 6 is controlled to provide the image data from the field memory 3 to the D / A conversion circuit 7, and only the output timing of the index signal is on the index signal output circuit 5 side. And the index signal is given to the D / A conversion circuit 6. As a result, the indexes 9a and 9b are displayed at the left end of the screen.

Next, when the designation button of the operation unit 4 is operated, the control means 8 controls the output timing of the index signal based on the vertical and horizontal synchronization signals of the video signal according to the operation to control the indexes 9a and 9b. The display position of is moved up and down according to the operation of the designated button.

When the still image button is operated and the screen still mode is entered after the designation of the arbitrary portion by the designation button is completed, the control means 8 sequentially writes and reads the image data other than the designated arbitrary portion in the field memory 3. The image data corresponding to an arbitrary portion is not updated, and only the reading is performed. The image data and the index signal read from the field memory 3 are converted into an analog signal by the D / A conversion circuit 7 via the switching circuit 6 and output as a video signal from the video output terminal 10 to display the display section (not shown). Given to.

As a result, only the designated arbitrary part is displayed as a still image, and the other part is displayed as a moving image. By displaying only the necessary part as a still image in this way, it is possible to grasp the progress of the program, and since it is displayed as a still image in its original size, it is difficult to see telop characters. Also, there is no loss of the image of the required part.

In general, the display of the address to which the quiz program is applied and the list of ingredients of the cooking program are performed for a certain period of time, so that the operation of the display button, the designation button, and the still image button on the operation unit 4 described above can be interrupted during that period. It is done by using.

In the above-mentioned embodiment, although the arbitrary portion in the vertical direction of the screen is designated by the two indexes 9a and 9b, as shown in FIG. 3 as another embodiment of the present invention, the indexes 9c and 9d are further specified. It may be provided so that the horizontal direction of the screen can also be designated.

<Effects of the Invention> As described above, according to the present invention, an arbitrary portion of an image is displayed as a still image, and the other portions are displayed as a moving image. There is no problem of not knowing the progress status of, the image of a required portion is missing, or the telop character is hard to see because the still image is small.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part of one embodiment of the present invention, FIG. 2 is a diagram for explaining a display screen of the embodiment of FIG. 1, and FIG.
FIG. 4 is a diagram corresponding to FIG. 2 of another embodiment of the present invention, and FIG. 4 is a diagram showing a display screen of a conventional example. 2 ... A / D conversion circuit, 3 ... field memory (display memory), 4 ... operation unit, 5 ... index signal output circuit, 6
...... Switching circuit, 7 ... D / A conversion circuit, 8 ... Control means.

Claims (1)

[Claims] 1. A television receiver having a still image function for displaying an arbitrary portion of an image as a still image, comprising: an operation unit operated for designating the arbitrary portion; To display an A / D conversion circuit for D conversion, a display memory to which image data from the A / D conversion circuit is written and read, and an index indicating a boundary of a portion designated according to the operation on the screen. Index signal output circuit for outputting the index signal, a switching circuit for switching and outputting the image data read from the display memory and the index signal, and a D / A conversion for D / A converting the output of the switching circuit. A circuit, and control means for performing writing / reading control of the display memory, output control of the index signal output circuit, and switching control of the switching circuit based on the output of the operation unit and the video signal. In the screen still mode, the control unit sequentially writes and reads image data corresponding to a portion other than the set arbitrary portion to the display memory to update the data, and the image corresponding to the arbitrary portion. A television receiver characterized in that the still image of the arbitrary portion is displayed by repeatedly reading the data without updating the data.