JPH0810913B2 - Video signal processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a video projection system (hereinafter abbreviated as VPS) to magnify and project a video, in which the position of a subtitle such as a movie can be changed. Regarding display device.

2. Description of the Related Art In recent years, video software, especially movie software, has been enriched, and TV screens are becoming larger, and it is expected that the screen will shift to larger screens using VPS in the future. .

FIG. 3 is a schematic block diagram of VPS. 1 in the figure is a Y / C that separates the video signal into a luminance signal and a chrominance signal.
Separation circuit, 2 is an image amplification circuit for amplifying the luminance signal Y, 3
Is a color signal demodulation circuit for returning a color signal to an I / Q or color difference signal, 4 is a matrix circuit for obtaining an RGB signal, 5 to 7
Is a cathode ray tube of RGB (hereinafter abbreviated as CRT), 8-10 is CRT 5-7
, A lens for converging the light of 11, a sync separation circuit for obtaining a sync signal from a video signal, a vertical deflection circuit, a horizontal deflection circuit for generating a horizontal deflection and a high voltage, and a screen for projecting a projected image. .

The operation of the VPS configured as described above will be briefly described below.

The input video signal is separated into a Y signal which represents a luminance signal component and a C signal which represents a chrominance signal component in the video signal which is input to the Y / C separation circuit 1, and the Y signal is the video amplification circuit 2.
The C signal is input to the matrix circuit 4 via the color signal demodulation circuit 3 for demodulation, is converted into RGB primary color signals, and drives the CRTs 5 to 7.

On the other hand, the synchronization relationship is separated from the video signal by the sync separation circuit 11, and one enters the vertical deflection circuit 12 in the vertical direction.
The other enters the horizontal deflection circuit 13 and outputs a signal for performing horizontal scanning. The horizontal deflection circuit 13
Also includes a high voltage generator circuit.

The images projected on the CRTs 5 to 7 are projected on the screen 14 by the lenses 8 to 10 to reproduce a large image.

The VPS as described above can have the following functions.

As shown in Fig. 4, it is usually 4: 3 for NTSC video signals.
Although it has the aspect ratio of, the video source has images such as cinema size with the top and bottom missing like a movie. In such a case, as shown in FIG. 5, for example, it is possible to change the horizontal screen size while keeping the vertical direction constant, and to extend the vertically missing image vertically into a single image and horizontally extend it at the same ratio. A function is being considered that allows you to enjoy powerful images that are complete.

This expansion can be achieved by changing the horizontal / vertical deflection current (changing the amplitude).

Depending on the type of the video source lacking in the upper and lower parts, the subtitle super is placed outside the video portion, and in this case, the subtitle super becomes invisible when it is enlarged to one screen.

Therefore, using a field memory, a function of storing only the subtitle superimposition, delaying it, and synthesizing it with the video of the next field so that only the subtitle superposition can be moved and viewed can be considered.

FIG. 6 shows a block diagram of a video signal processing device in one embodiment thereof.

Reference numeral 15 is an A / D converter that performs analog-to-digital conversion of the Y signal separated by the Y / C separation circuit 1, 16 is an AND gate that extracts only the caption portion of the video signal, and 17 is a field for delaying the Y signal A memory, 18 is a comparator for comparing predetermined comparison data with the output data of the field memory 17, and 19 is a selector for switching the Y signal A / D by the output of the comparator 18 and the output signal of the field memory 17. .

The operation of the video signal processing device configured as described above will be described below.

The Y / C separated Y signal is converted into a digital signal by the A / D converter 15. Here, the sampling frequency is 4Fsc (Fsc
= 3.579545MHz), 8-bit, 256 gradations are selected. Memory 17 is FiFo (first in first out)
A type of field memory is used. This field memory 17 writes in synchronization with the basic vertical sync signal,
The reading is performed in consideration of the delay time so that the subtitles come to the desired position of the video data.

Since the comparator 18 creates a switching signal from the output of the field memory 17, the subtitle has a lot of white characters, so the comparison is made with a certain value, and if it is large, the signal is "H", and if it is small, the signal is "L". Is output.

The selector 19 selects and switches the output of the A / D converter 15 when it is small and the delay output of the field memory 17 when it is small by the comparison output of the comparator 18, and selects from the position of the original subtitle supermarket. It is moved to the position and output in a combined form.

Problems to be Solved by the Invention As a means for moving and synthesizing a subtitle super, there is a method in which the values of subtitle data are compared in size as in the conventional example, and the comparison signal output is used for switching. There is a problem that it is easily affected by a video signal, causes jitter, and the edges of synthesized subtitles flicker, which makes it difficult to make.

In view of the above problems, the present invention is to provide a video signal processing device in which a subtitle supermarket can be easily viewed even if the video is enlarged to one screen.

Means for Solving the Problems In order to solve the above problems, the video signal processing device of the present invention compares the data delayed by the field memory with a predetermined value, and outputs the video delayed by the comparison signal output. By removing unnecessary portions of the signal and adding them to the original video signal, a natural flicker-free composition is possible.

Effect of the Invention With the above-described configuration, according to the present invention, when projecting an image lacking in the upper and lower parts by enlarging it to the full screen, the subtitles are outside the effective video signal (the part lacking in the upper and lower parts). When moving and synthesizing, is not easily affected by the delayed video signal and can be easily viewed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a video signal processing device according to an embodiment of the present invention.

15 is an A / D converter for analog-to-digital conversion of the Y signal separated by the Y / C separation circuit, 16 is an AND gate for extracting only the caption portion of the video signal, 17 is a field memory for delaying the Y signal Reference numeral 18 is a comparator for comparing the predetermined comparison data with the output data of the field memory 17, and 19 is a selector for switching between the video signal delayed by the output of the comparator 18 and zero. Similar to the selector 19, 20 is a subtracter for adding and subtracting by the output of the comparison signal device 18, and 21 is an adder for adding the output of the arithmetic unit 20 and the output of the A / D converter 15.

The operation of the video signal processing device configured as described above will be described below.

The Y / C separated Y signal is converted into a digital signal by the A / D converter 15. Here, the sampling frequency is 4Fsc (Fsc
= 3.579545MHz), 8-bit, 256 gradations are selected. Memory 17 is FiFo (first in first out)
A type of field memory is used. This field memory 17 writes in synchronization with the basic vertical sync signal,
The reading is performed in consideration of the delay time so that the subtitles come to the desired position of the video data.

Since the comparator 18 generates a switching signal from the output of the field memory 17, it pays attention to the fact that there are many white characters in subtitles, and compares them with a certain value. When they are large, that is, when the subtitles are "H", when they are small Outputs the "L" signal.

The selector 19 switches the output of the field memory 17 when it is large and the output of the field memory 17 when it is small by the comparison output of the comparator 18, and the output of the field memory 17 when it is large by the comparison output of the comparator 18 in the arithmetic unit 20. The comparison signal output value is subtracted from to remove unnecessary portions such as the synchronization signal, and when it is small, zero is output as it is.

The adder 21 adds the output of the A / D converter 15 and the output of the arithmetic unit 20 to move from the original subtitle position to the desired position and form a composite form.

The conceptual diagram of FIG. 2 is shown. a is the field memory 17
In the signal delayed by, b indicates the output of the arithmetic unit 20, and when this output signal is combined with the original video signal c by the adder 21, the output becomes d. Overflow occurs because of the addition, but needless to say, it is replaced with white at this time.

With the above configuration, even when the subtitles outside the video are rearranged within the video, the comparison signal output is not affected and the subtitles can be easily viewed.

EFFECTS OF THE INVENTION As described above, according to the present invention, in this combination, the original video signal remains as it is, and the composite signal overlaps a comparison signal created from its own signal with the original video signal and a synchronization signal. Since it only subtracts the part that is present, it is possible to combine without compromising the quality of subtitles, and it is possible to move the subtitles naturally.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a video signal processing device according to an embodiment of the present invention, FIG. 2 is a conceptual diagram thereof, FIG. 3 is a block diagram of a conventional video display device, and FIG. FIG. 5 is a diagram showing an image, FIG. 5 is a diagram showing an enlarged display example of FIG. 4, and FIG. 6 is a block diagram showing an example of moving picture subtitle synthesis proposed prior to the present invention. 15 ... A / D converter, 17 ... memory, 18 ... comparator, 19 ...
… Selector, 20 …… Calculator, 21 …… Adder.

Claims (1)

[Claims] 1. When synthesizing an analog-digital converted first television signal and a second television signal which is stored and delayed and read out, the second television signal is predetermined. Means for comparing the obtained value, means for switching the second television signal and the fixed value by the comparison signal output, and means for subtracting or adding the comparison value and the output of the switching means by the comparison signal output. And a video signal processing device having means for adding the output and the first television signal.