JPH0787548B2 - Character / pattern memory playback device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a character / pattern storage device capable of storing an image pattern such as a title character or a graphic, and outputting the image pattern superimposed on another image. is there.

<Prior Art> In recent years, the demand for home video cameras has increased with the spread of home VTRs, and the demand for multifunctional and editing functions of home video cameras has increased.

Among these functions, the impose for inserting a title and the like and the terrors are one of the most requested functions.

A conventional telop device for inserting a title or the like will be described below with reference to FIG. In FIG.
(1) is a video signal input terminal, (2) is a detection circuit for extracting character / pattern information, (3) is a sync separation circuit for separating a sync signal from the video signal input, (4) is a serial-parallel conversion circuit, ( 5) is a parallel-serial conversion circuit,
(6) is a memory, (7) is a reference clock oscillation circuit,
(8) and (9) are vertical counters and horizontal counters that respectively instruct addresses of the memory (6), and (10) is a vertical counter (8) from the sync separation circuit (3) and the oscillation circuit (7),
A frequency divider circuit for controlling the up-down timing of the horizontal counter (9), (11) a controller, (12) a user command signal such as a switch, and (13) superimposing character / pattern information on another video signal. Character superposition circuit for
(14) is a video signal output terminal.

First, the main flow of the character / pattern signal will be described. The video signal input from the video signal input terminal (1) is
A sync signal is created by the sync separation circuit (3) and binarized by the detection circuit (2) to become a digital signal. This digital signal becomes a digital signal of 8 bits or the like by the serial / parallel conversion circuit (4) and is stored in the memory (6). A digital signal of 8 bits or the like, which is information such as characters and patterns stored in the memory (6), becomes a serial digital signal by the parallel-serial conversion circuit (5) and is superimposed on the original video signal by the character superposition circuit (13). Output to the video output terminal (14).

In order to realize the above operation, a reference clock is created by the oscillation circuit (7) of this circuit, and this reference clock is supplied to the serial-parallel conversion circuit (4) and the parallel-serial conversion circuit (5) to convert the conversion timing. give. Also,
This clock is divided by a frequency dividing circuit (10) and then supplied to a horizontal counter (9) which is an addressing counter of a lower bit of the memory (6) to address the memory (6). The carry signal of the horizontal counter (9) is supplied to the vertical counter (8), which is the upper bit addressing counter of the memory (6), to address the memory (6). Further, the controller (11) is designated by a command signal (12) such as a switch to write or read a character / pattern. As a result, the controller (11) has a memory (6), a serial-parallel conversion circuit (4), a parallel-serial conversion circuit (5), a horizontal counter (9), a vertical counter (8), a frequency dividing circuit (10), and an oscillation circuit. (7) is set to the operating or non-operating state. The controller (11) resets the horizontal counter (9) and the vertical counter (8) at the start point of one field with the sync signal supplied by the sync separation circuit (3) as a reference, and patterns and characters on the screen are displayed. Correlation is made between the positions such as and the address of the memory (6).

<Problems to be Solved by the Invention> The conventional character / pattern storage / reproduction device has been described above. However, the conventional character / pattern storage / reproduction device can automatically switch the character / pattern screen at regular intervals. Nakatsuta.

An object of the present invention is to provide a character / pattern storage / reproduction device capable of automatically switching between character / pattern screens at regular intervals in a home video camera or the like to produce an animation-like effect. is there.

<Means for Solving the Problem> A character / pattern storage / reproduction device according to the present invention is a means for binarizing an input video signal to form character / pattern information, and previously storing character / pattern information on different screens. Memory means, a reading means for reading a plurality of different character / pattern information from the memory means by switching at regular intervals, and the character / pattern information read by the reading means is superimposed on the currently input video signal. And a superimposing means for

<Operation> By switching the upper bits at regular intervals, the page, that is, the character / pattern screen can be switched.

<Embodiment of the Invention> An embodiment of the present invention when the number of screens is two will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a character / pattern storage / reproduction device according to the present invention.
In FIG. 1, (1) is a video signal input terminal, and (2)
Is a detection circuit for extracting character / pattern information, (3) is a sync separation circuit for separating a sync signal from a video signal input,
(4) is a serial-parallel conversion circuit, (5) is a parallel-serial conversion circuit, (6) is a memory, (7) is a reference clock oscillation circuit, and (8) and (9) are memory (6), respectively.
Vertical counter, horizontal counter,
(12) is a command signal of a user such as a switch, (13) is a character superimposing circuit for superimposing character / pattern information on another video signal, (14) is a video output terminal, and (11) is a command signal (12 ) And a sync signal from the sync separation circuit (3) to control the count and reset timing of the vertical counter (8) and horizontal counter (9) and the reading and writing of the memory (6), and (15) is a screen (16) is a moving image mode command signal, which is a top-level bit switching circuit which is a page command of.

FIG. 2 shows an example of a memory map of the character / pattern storage / reproduction device of the present invention. A memory generally called a 256K bit is configured to store and reproduce two 512-bit horizontal and 256-bit vertical screens. ing. The signal of NTSC system is 262.5H (horizontal scanning) for 1V (vertical scanning), but the effective period in which the video signal is actually input is about 24OH, so 256 vertical bits are sufficient.

The state of automatically switching the screen is called the moving image mode. When not in the moving image mode, that is, when the moving image mode command signal (16) is not input, the memory / playback operation of the character / pattern information is performed exactly as in the conventional example. To do. At this time, the page command of the screen from the command signal (12) is given to the uppermost bit switching circuit (15) to switch the uppermost address of the memory (6), and the character / pattern information is stored and reproduced on each page. To be done.

When the moving image mode command (16) is input, the highest-order bit switching circuit (15) automatically switches the highest-order bit of the address of the memory (6) at fixed time intervals for reading. If the illustrations shown in FIG. 2 are stored in the first and second pages of the memory (6), the respective illustrations are alternately superimposed on the signal from the video signal input terminal (1). Can be output.

Although the case where the number of screens is 2 has been described above, the same is conceivable even if the number of screens is increased to 4 and 8. At this time, not only the highest bit of the address but also the upper 2 bits and 3 bits can be sequentially switched.

<Effects of the Invention> As described above, according to the present invention, arbitrary stored characters / graphics (title, comment, illustration, etc.) are read out and projected on a normal video signal, taken by a video camera, and edited by a video camera. When using for, title, comment,
Switching information such as illustrations like animation,
You can get the effect that they are moving.

[Brief description of drawings]

1 and 2 are views showing an embodiment of the present invention, FIG. 1 is a block diagram showing the configuration, and FIG. 2 is a view showing a memory map. FIG. 3 is a block diagram showing a conventional embodiment. 2: Detection circuit, 4: Serial-parallel conversion circuit, 5: Parallel-serial conversion circuit, 6: Memory, 11: Controller, 13: Character superimposing circuit, 15: Top bit switching circuit, 16: Movie mode command signal The same reference numerals indicate the same or corresponding portions.

Claims (1)

[Claims] 1. A means for binarizing an input video signal to form character / pattern information, a memory means for previously storing the character / pattern information of a plurality of different screens, and a plurality of different character / patterns from this memory means. A character / pattern comprising: a reading means for switching and reading information at fixed time intervals; and a superposing means for superposing the character / pattern information read by the reading means on a currently input video signal. Memory playback device.