JPH0831987B2 - 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, with the spread of home VTRs, the demand for home video cameras has increased, and demands for multifunctional and editing functions of home video cameras have 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 that extracts character / pattern information, (3) is a synchronization separation circuit that separates a synchronization 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,
(8) and (9) are a vertical counter and a horizontal counter for instructing the address of the memory (6), (11) is a controller, (12) is a command signal of a user such as a switch, and (13).
Is a character superimposing circuit for superimposing character / pattern information on another video signal, and (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 converted into a digital signal by the detection circuit (2) at the same time that a synchronization signal is generated by the synchronization separation circuit (3). 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 supplied to a horizontal counter (9) which is an addressing counter of a lower bit of the memory (6) and addresses 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). Also, the controller (1
In 1), writing or reading of characters / patterns is designated by a command signal (12) such as a switch. As a result, the controller (11) operates or does not operate the memory (6), the serial-parallel conversion circuit (4), the parallel-serial conversion circuit (5), the horizontal counter (9), the vertical counter (8), and the oscillation circuit (7). Activate. 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, in the conventional character / pattern storage / reproduction device, scrolling of character / pattern information as in a movie or television broadcast is performed. I couldn't do it.

An object of the present invention is to use a home video camera or VTR to scroll characters / pattern information as in a movie or TV broadcast, and to start / stop scrolling at any position. -To provide a pattern memory reproducing device.

<Means for Solving the Problems> A character / pattern storage / reproduction device according to the present invention is a detection circuit for binarizing character / pattern information superimposed on a video signal, and a parallel digital signal for the binarized signal. A serial-parallel conversion circuit for converting into a parallel digital signal, a memory for storing this parallel digital signal, a parallel-to-serial conversion circuit for converting the data read from this memory into a serial digital signal, and a video in which this serial digital signal is added and superimposed on another video signal. A character superimposing circuit that outputs as a signal output, configured to give a command to the memory read address in synchronization with the video signal by giving an offset to the address at the time of writing and to start and stop the offset address up and down at any value. Offset addressing circuit, read address A video signal which is provided with masking means for preventing data other than stored information from being read by a read masking signal created in accordance with The scrolling of the stored information is started and stopped at an arbitrary position above, and the masking means does not read data other than the stored information.

<Operation> By reading from the memory at a timing different from the timing when writing to the memory,
The pattern information can be read at a position different from the writing position. By changing the difference between the timing of writing to the memory and the timing of reading from the memory at a constant interval in synchronization with the video signal, the character / pattern information can be smoothly moved and scrolled.

<Examples of the Invention> Examples of the present invention 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) is a video signal input terminal, (2) is a detection circuit that extracts character / pattern information, (3) is a synchronization separation circuit that separates a synchronization 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,
(8) and (9) are vertical counters and horizontal counters for instructing the addresses of the memory (6), (12) is a user command signal such as a switch, and (13) is superimposition of character / pattern information on other video signals. Character superposition circuit for, (14)
Is a video output terminal, (15) is an offset addressing circuit for adding and reading offsets from the time of writing, (16) is a read masking signal for preventing data other than the stored range from being read, (10) ) Is a switch circuit which reads out a serial digital signal which is character / pattern information output from the parallel-serial conversion circuit (5) and turns it on and off by a masking signal (16),
(11) inputs the command signal (12) and the sync signal from the sync separation circuit (3), and counts and resets the vertical counter (8), the horizontal counter (9), and the offset address counter (15). This is a controller for controlling reading and writing of the memory (6), and the whole of them constitutes a character / pattern storage / reproduction device (17).

FIG. 2 shows an example in which the character / pattern storage / reproduction device of the present invention is used in a video camera.
9) is the title picture to be inserted, (20) is the lens, (21)
Is an image sensor, (22) is a signal processing circuit, and (23) is a monitor television.

FIG. 3 shows an example of a horizontal counter, an offset address counter, a monitor TV image, and a read-out masking signal when a title image is recorded and superposed on a video image of a subject and the title image is horizontally scrolled. Show.

In Fig. 2, the title image (1
9) is photographed, the video signal is taken out by the image sensor (21) through the lens (20), the video signal is synthesized from the video signal by the signal processing circuit (22), and input to the character / pattern storage / reproduction device. .

The input video signal is binarized by the detection circuit (2) into a digital signal at the same time as the sync signal is created by the sync separation circuit (3) as in the conventional character / pattern storage / reproduction device. The 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), but the controller (11) uses the horizontal counter (9), 1 at the start point of one horizontal scanning,
The vertical counter (8) is reset at the start point of vertical scanning.

When the title image (19) is stored, the subject (18) is photographed and the video signal is input to the character / pattern storage / playback device (17). When the video signal of the subject is input, the controller (11) uses the sync signal generated by the sync separation circuit (3) as a reference to start the horizontal counter (9) at the start point of one horizontal scan and at the start point of one vertical scan. The vertical counter (8) is reset and the position of patterns, characters, etc. on the screen and the title image (19) stored in the memory (6)
Correlate with.

FIG. 3 shows a state in which the horizontal counter (9) is set to 256 and horizontal scrolling is performed. The offset address designating circuit (15) is designated in synchronization with the vertical scanning (V sync signal), and the horizontal counter (9) presets the offset address at the start point of the horizontal scanning (H sync signal) and counts the reference clock. To do. In the state of FIG. 3A, the offset is 0, and the address of the horizontal counter (9) becomes the read address of the memory (6) as it is. Therefore, the read masking signal (16) is not output, and the telop is displayed in a state (reference position) in which the image of the monitor television (23) is not scrolled. In Fig. 3 (b), the offset is
When it is 128, 128 is preset at the starting point of horizontal scanning,
The memory (6) is read at the address obtained by adding the count-up of the horizontal counter (9). And
When the read address is 256 or more, the read masking signal (16) is output, and the image on the monitor TV (23) is scrolled to the left by half. The start and stop of counting can be controlled by the count start and stop of the offset addressing circuit (15), and the scroll direction can also be controlled by up and down of the counter.

The video camera has been described above, but the same applies to a camera-integrated VTR. In this case, a more complete editing function can be realized by recording the created character / pattern on a tape or inputting a video signal reproduced from the tape to a character / pattern storage / reproduction device.

<Effects of the Invention> As described above, according to the present invention, any stored character, figure, or the like is read out and displayed on a normal video signal in an overlapping manner.
When using it for video camera shooting and video editing, you can scroll information such as titles, comments, illustrations, etc. as you are doing in movies and TV broadcasting, and you can also start / stop scrolling at any position .

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention.
FIG. 3 is a block diagram showing the configuration, FIG. 2 is a diagram in which the character / pattern storage / reproduction device of the present invention is applied to a video camera, and FIG.
The figure is a diagram showing a state when scrolling of characters and patterns according to the present invention is performed. FIG. 4 is a block diagram showing a conventional embodiment. 2: Detection circuit, 4: Serial-parallel conversion circuit, 5: Parallel-serial conversion circuit, 6: Memory, 10: Switch circuit, 11: Controller, 13: Character superposition circuit, 15: Offset address designation circuit, 16: Read masking Signals In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A detection circuit for binarizing character / pattern information superimposed on a video signal, a serial / parallel conversion circuit for converting the binarized signal into a parallel digital signal, and a memory for storing the parallel digital signal. , A parallel-to-serial conversion circuit that converts the data read from this memory into a serial digital signal, a character superimposing circuit that adds and superimposes this serial digital signal on another video signal and outputs it as a video signal output, a memory that synchronizes with the video signal Offset addressing circuit configured to give the read address of the offset to the address at the time of writing and to start and stop the offset address up and down at any value, stored by the read masking signal created according to the read address information Equipped with a masking means for preventing reading of external data, the stored information stored in the memory is scrolled while being superimposed and output on a video signal, and the stored information can be scrolled at an arbitrary position on the superimposed video signal. A character / pattern storage / reproduction device configured to start and stop and not to read data other than stored information by the masking means.