JPH03126385A - Video synthesis device - Google Patents

Abstract

PURPOSE:To reduce the deterioration in the picture quality by converting a video signal into a digital signal, storing the converted signal into a primary memory, transferring the picture element to a same location of a secondary memory and storing it when a brightness level is higher than a reference level, converting the signal into an analog signal and synthesizing the result onto a video image being a background. CONSTITUTION:When a character signal (a) is inputted as a video signal, an A/D converter section 1 converts it into a digital signal and it is stored in a primary memory 2 and a brightness level of each picture element of the primary memory 2 is discriminated by a level detection section 3. Then an output signal of the primary memory 2 is recorded in the secondary memory 5 by the control of a memory control section 4 transferring the picture element of the primary memory 2 to the same location of the secondary memory 5 based on the discrimination output and the output of the secondary memory section 6 is converted into an analog signal and an output a' of a D/A converter section 6 and a video image (b) being a background are inputted to a superimposing device 7, where they are synthesized. Thus, no picture quality is deteriorated when plural character signals (a) are synthesized on the video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video compositing device that combines multiple videos to create one video.

[Conventional technology]

Conventionally, in order to add a video signal such as text to a video signal, a second
Usually, a super device 8 shown in the figure is used.

At this time, when the video 11 shown in FIG. 3 is input to the video signal input section VX of the super device 8, and the video 12 shown in FIG. The image 13 shown is obtained. At this time, the character signal shown in FIG. 4 is a white character on a black background. Further, the super device 8 detects this white portion and synthesizes a character signal.

By the way, when the number of character signals to be synthesized increases, there have conventionally been two methods as follows.

The first method is to synthesize one character signal using the above method and record the resulting output on a 1kVTR (video tape recorder). After this recorded video is played back and input to the video signal input section VI of the super device 8 shown in FIG. 2, a different character signal from the previous one is input to the character signal input section CI to perform synthesis. Similarly, record the output on a VTR. By repeating this process for the number of character signals to be combined, a video in which a plurality of character signals are combined is obtained.

Further, the second method is shown in FIG. This is the pre-stage KNAM (Non
Addltlve Mixing) An amplifier 9 is attached, a plurality of character signals 12x and 12z are NAM-combined here, and the output thereof is input to a super device 8, thereby combining a plurality of character signals.

[Problem to be solved by the invention]

However, in the first method among the conventional methods described above,
It takes time to repeat the video and playback on a VTR, and analog systems have the problem of deteriorating image quality.

In the second method, when the number of character signals to be synthesized increases, NAM
There is a problem in that the number of amplifiers 9 must be increased, resulting in an enormous amount of hardware.

[Means to solve the problem]

In order to solve such problems, the video synthesis device of the present invention includes an A/D conversion unit that converts a video signal into a digital signal, and a primary memory unit that records the signal converted by the A/D conversion unit. and determine the brightness level of each pixel of the primary memory,
Level “1” if higher than the standard, level “1” if lower
a level detection section that outputs a signal of "0"; a memory control section that transfers pixels of the primary memory to the same location of the secondary memory when the output of the level detection section becomes "1"; and the memory control section. a secondary memory section that records the output signal of the primary memory section under the control of the controller; a D/A converter section that converts the output of the secondary memory section into an analog signal; The apparatus is equipped with a super device that inputs the output signal of the D/A converter and synthesizes the output signal of the D/A converter on a background image.

[Effect]

Therefore, in the present invention, a plurality of character signals can be easily combined into a video signal by a digital system using a memory without deteriorating image quality.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a video synthesis device according to the present invention. In the figure, 1 is an A/D conversion unit that converts a video signal into a digital signal, 2 is a primary memory that records this output signal, and 3 is a primary memory that determines the brightness level of each pixel in 2, and A level detection unit outputs a level “l” signal when the level is high, and a level “0” signal when the level is low, and 4 is a pixel of the primary memory 2 when the output of the level detection unit 3 is “1”, which will be described later. This is a memory control unit that transfers data to the same location in the next memory. 5 is a secondary memory that records the output signal of the primary memory 2 under the control of the memory controller 4; 6 is a D/A converter that converts this output signal into an analog signal;
T is a super device that inputs the output signal of the D/A converter 6 to the character signal input section CI, and inputs a background image to the video signal input section VI.This super device T is different from the conventional example. It has a similar function and combines the output signal of the D/A converter 6 onto the background image.

Next, the operation of the configuration of the above embodiment will be explained.

Here, when a character signal 1 is input as a video signal, this character signal is converted into digital by the A/1) converter 1 and written into the primary memory 2.

Thereafter, the memory control section 4 gives an address to the primary memory 2, reads out the contents of the primary memory 2 pixel by pixel, and inputs the output to the level detection section 3. At this time, since the character part of the character signal is the white level part,
If Me with a high brightness level is found, it can be determined that it is a character. Therefore, the level detection unit 3 determines whether the brightness level is higher than a preset threshold,
When the level is high, a signal of level R is given to the memory control unit 4. Also, when it is low, a signal of level "0" is given.

Thereby, in the memory control section 4, when a level "1" signal is received from the level detection section 3, the pixels at the address given to the primary memory 2 at that time are copied to the secondary memory 5.

If the above operation is performed for one screen of the primary memory 2, 1
Next, only the character part of the character signal written to memory 2 is 2.
Next, it is transferred to the memory 5.

On the other hand, if there are multiple character signals, if you rewrite the primary memory 2 to the next character signal and do the same thing, the secondary memory 5
, the character parts of the character signals input the first and second times are NAMed and the same thing as what was written is written.

Next, the secondary memory 5 is read out, the D/A converter 6 converts it into an analog signal, and the signal is input to the character signal input section CI of the super device 7. As a result, in the super device 7, the video 6 input from the video signal input section vI and the D/
A character signal a' obtained by NAMing a plurality of character signals output from the A converter 6 can be synthesized.

〔Effect of the invention〕

As explained above, in the present invention, a video signal is converted into a digital signal, this is recorded in a primary memory, and the level detection unit determines the brightness level of each pixel in this primary memory. Then, a memory control section is provided which transfers the pixels of the primary memory to the same location of the secondary memory based on this discrimination output, and under the control of this memory control section, the output signal of the primary memory is
By recording to the next memory, converting the output of the secondary memory section into an analog signal, and inputting the output of the D/A converter section and the background video to the super device,
This super device allows D/A to be applied to the background image.
Since the output signals of the converter can be combined, it is possible to combine multiple character signals with a video signal without deteriorating the image quality.
This has the advantage that it can be accomplished in a short time and without using more NAM amplifiers.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the video synthesis device of the present invention, FIG. 2 is a block diagram of a conventional video synthesis device, and FIG.
The figure shows an example of a video signal, Figure 4 shows an example of a character signal, and Figure 5 is the output when the signals in Figures 3 and 4 are input to the video synthesis device shown in Figure 2. FIG. 6, a diagram showing a video, is a block diagram of another conventional video compositing device. 1..Fist-iv'o conversion unit, 2-.11#1 primary memory,
3... Level detection section, 4... Mesori control section, 5
...Secondary memory section, 6...D/A conversion L 7.
...Super device. Figure 3

Claims (1)

[Claims] A video synthesis device that combines multiple videos into one video, comprising: an A/D conversion section that converts a video signal into a digital signal; a primary memory section that records the signal converted by the A/D conversion section; determining the brightness level of each pixel of the primary memory;
Level “1” if higher than the standard, level “1” if lower
a level detection section that outputs a signal of "0"; a memory control section that transfers pixels of the primary memory to the same location of the secondary memory when the output of the level detection section becomes "1"; and the memory control section. a secondary memory section that records the output signal of the primary memory section under the control of the D/A converter that converts the output of the secondary memory section into an analog signal; 1. A video synthesizing device comprising: a super device that inputs an output signal of a D/A converter and synthesizes the output signal of the D/A converter onto a background image.