JPH07322159A - Video signal processing device - Google Patents

Abstract

PURPOSE:To insert a caption with a high picture quality at the time of expanding and displaying the wide video signal of movie soft or the like on a wide display device like a wide television. CONSTITUTION:A picture quality improving circuit 103 extracts features of an input signal to perform the quality improvement processing like signal level conversion. A character information signal processing circuit 102 reduces or expands the signal of a caption part in the inputted signal and outputs the result to a nonlinear processing circuit 104. This circuit 104 subjects the inputted signal of the caption part to nonlinear processing and outputs the result to a synthesis processing circuit 119. The signal of the caption part outputted from the nonlinear processing circuit 104 and the video signal outputted from the picture quality improving circuit 103 are inputted to the synthesis processing circuit 119 and are synthesized and outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a display device having a wide screen aspect ratio, such as a high-definition television or a wide-screen television, to display a wide video signal such as a movie on an enlarged screen. The present invention relates to a video signal processing device for moving and displaying character information such as a subtitle that overflows on a display screen.

[0002]

2. Description of the Related Art NT which is the current standard television system
In addition to the SC system, many high-definition television systems that reproduce higher-definition sound and video with greater realism have been proposed and are being put to practical use not only in Japan but also in the United States and Europe.

In Japan, especially the MUSE system and ED
The TV-II system is predominant, and the former is not compatible with the current system, but maintains compatibility by using a converter, and the latter is a system considering compatibility with the current system. here,
What these high-definition television systems have in common is
The aspect ratio of the screen is 16: 9, which is wider than the current NTSC system. In addition to this, with regard to the current NTSC system, there is an increasing tendency to make the film horizontally wide in movies and new video software. Against the background of such a horizontally elongated video source, manufacturers have successively commercialized television sets equipped with wide display devices such as wide televisions and high-definition televisions. The above wide-screen and high-definition TVs have a screen aspect ratio of 16: 9 and are wide (landscape).
Therefore, it is suitable for viewing high-definition software and landscape software such as movies.

FIG. 2 shows an NT screen with an aspect ratio of 4: 3.
It is explanatory drawing which each showed the display form at the time of displaying the horizontally long movie software recorded by SC system, and the display form at the time of displaying the said movie software on the wide screen of aspect ratio 16: 9. As shown in FIG. 7A, in the case of horizontally long movie software, subtitles are usually inserted below the screen having an aspect ratio of 4: 3. Therefore, when displaying the above movie software on a TV with a wide display device,
As shown in FIG. 3B, when the image is enlarged and the image is displayed on the full screen, the subtitles are projected outside the screen. Therefore, in the case of displaying such movie software, it is necessary to move and insert the subtitles into the display area at the same time as the enlargement processing of the image is performed as shown in FIG.

As a conventional technique for moving / inserting such a subtitle in the display area, for example, Japanese Patent Laid-Open No. 252577/1992 is available.
Japanese Patent Laid-Open No. 4-306980, and Japanese Patent Laid-Open No.
Examples thereof include those described in JP-A-321387. Therefore, here, among them, Japanese Patent Laid-Open No. 252577/1992
The technique described in the publication will be described with reference to FIGS. 2 and 3.

FIG. 3 is an explanatory view for explaining the signal processing in the above-mentioned conventional technique. In this conventional technique, first, in the movie software shown in FIG. 2A, a region in which a subtitle is inserted (that is, a hatched region in FIG. 2A, which is composed of a subtitle and a subtitle background. Hereinafter, this area is referred to as a caption portion.) The signal level minimum value (that is, the signal level of the caption background) is obtained, and the minimum value is subtracted from the caption portion signal to obtain the signal value. The signal is a caption signal. In this way, the subtraction is performed in consideration of the fact that the signal level of the subtitle background in the signal of the subtitle part is not constant depending on the movie software, but varies a little,
This is to eliminate the variation. That is, in the signal obtained by the subtraction, that is, in the caption signal, the signal level of the caption background is “0 level”. Therefore, for example, when there is a character “H” as shown in FIG. 3A as a subtitle, the subtitle signal of the part indicated by the horizontal line XX ′ in FIG. It becomes like the solid line in (B),
The signal level of the caption background is "0 level".

Next, in this conventional technique, low-pass filter processing (hereinafter referred to as LPF processing) is performed on the caption signal shown by the solid line in FIG. 3B, and the LPF shown by the dotted line in FIG. Get the processed signal. Next, in this conventional technique, the LPF processed signal shown by the dotted line in FIG. 7B and the predetermined signal level (the minimum value of the signal level of the caption signal, that is, "0 level"
(A little larger than the level), and the caption detection signal shown in FIG. That is, this subtitle detection signal is
As is clear from FIG. 6C, the signal is a high-level section in the range including the subtitle (that is, the character) and the peripheral portion thereof.

Next, in this conventional technique, either the signal of the caption portion or the signal other than the signal of the caption portion (that is, the video signal) is switched according to the obtained caption detection signal, and either one of them is switched. Is output. That is, when the caption detection signal is at the high level, the caption signal is output, and when it is at the low level, the video signal is output. By doing so, subtitle insertion processing is realized.

[0009]

However, in the above-mentioned signal processing in the prior art, the signal obtained from the signal of the caption portion is compared with a predetermined signal level to obtain the caption detection signal and detect the caption. Since the signal of the caption portion and the video signal are switched by the signal, the reproduced video includes the caption or the caption background (that is, the signal of the caption portion) and the video (that is, the video signal) in the vertical direction of the screen. There is a problem in that the boundary (that is, the switching portion) becomes a serrated shape.

In other words, this is because the caption signal itself or the caption signal itself obtained from it cannot originally have a steep edge in the caption portion, so that these signals are set for each horizontal line arranged in the vertical direction of the screen. If you see it (eg, Figure 3
(A) When the signals of the horizontal line of XX ′ and the horizontal lines before and after the horizontal line are viewed), the inclination and position of the edges are not uniform, and such a signal has a predetermined signal level (that is, , Fixed signal level), even if the caption detection signal is obtained, the high-level section of the obtained caption detection signal will be slightly deviated for each horizontal line.

Moreover, in the above-mentioned conventional technique, the LPF processing is performed on the caption signal to smooth the edges of the caption portion, so that the inclinations and positions of the edges become more uneven, and the obtained caption detection. The deviation of the high-level section of the signal becomes even larger, and the jaggedness at the boundary between the subtitle or the subtitle background and the video becomes more prominent. In the LPF processing, this tendency becomes larger as the pass band of the LPF for extracting the low band of the caption signal becomes narrower, that is, as the edge becomes smoother.

Furthermore, since noise is generally superimposed on the signal of the caption portion, noise is also superimposed on the caption signal and LPF processed signal obtained from it. Therefore, the deviation of the high-level section of the obtained subtitle detection signal becomes larger due to the influence of this noise, and the jagged edges appear more conspicuously.

FIG. 4 is an explanatory diagram for explaining the problems in the above-mentioned prior art. The figure (A) is a caption signal,
3B shows the relationship between the video signals and their combined signals and the caption detection signal, and FIG. 3B shows the reproduced image after the above-described signal processing is performed on the characters shown in FIG. .

That is, by using the caption detection signal as shown in FIG. 4A, switching between the caption signal (caption signal in the figure) and the video signal enables switching output (ie, composite output).
As a result, the signal level of the caption background is output in the peripheral portion of the caption. Therefore, although the subtitle itself is output as it is, as described above, as shown in FIG.
Subtitle background and video (video signal) in the vertical direction of the screen
The boundary (switching part) with and becomes serrated.

Accordingly, an object of the present invention is to provide character information such as subtitles that are projected outside the display screen when a wide video signal such as movie software is enlarged and displayed on a wide display device such as a wide television. An object of the present invention is to provide a video signal processing device for moving and inserting a high quality image.

[0016]

In order to achieve the above object, in the present invention, a signal having a video signal and a character information signal in separate sections is input, and the signal from the section where the character information signal exists is input. A video signal processing device for extracting a character information signal, inserting character information included in the character information signal into a section in which the video signal exists, and outputting the character information signal, wherein the character information is extracted from the section in which the character information signal exists. Extract the signal,
Character information signal processing means for temporarily holding and outputting, non-linear processing means for receiving the output signal from the character information signal processing means and performing non-linear processing, and features of the video signal existing in the section in which the video signal exists And an image quality improving means for automatically converting the signal level and the like to improve the image quality, and an output signal from the image quality improving means and a character information signal output from the non-linear processing means are input and combined. And a synthesizing processing means for performing the above.

[0017]

The character information signal processing means extracts character information including a caption from the above-mentioned character information signal, temporarily holds it, and outputs it. The non-linear processing means performs non-linear processing on the character information to forcibly reduce the signal level of the background of the subtitle. The image quality improving means, among the signals described above,
At least the characteristics of the video signal are extracted, and the signal level and the like are automatically converted to improve the image quality. The combining processing means, when inserting / combining a caption in the signal of the caption part in the video signal, compares the signal obtained from the signal of the caption part with a predetermined signal level as in the above-described conventional technique. The caption signal output from the non-linear processing means and the image quality improvement processing means without obtaining the caption detection signal or switching between the caption signal and the video signal according to the obtained caption detection signal The video signal output from the input terminal is input, the signal with the higher signal level is selectively output, and the caption in the signal of the caption part is inserted into the video signal. Therefore, the reproduced video is a subtitle or subtitle background (that is, a signal of the subtitle part) in the vertical direction of the screen.
The boundary (that is, the switching portion) between the image and the image (that is, the image signal) does not have a sawtooth shape.

[0018]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
In FIG. 1, 101 is an input terminal, 102 is a character information signal processing circuit, 103 is an image quality improving circuit, 104 is a non-linear processing circuit, 105 is an LPF processing circuit, 106 is a subtractor, 1
07 is a maximum value selection output circuit, 108 is a clipping circuit, 1
09 is an output terminal, 110 is a caption demodulation unit, 111 is a switch circuit, 112 is a caption magnification variable processing circuit, 113 is a caption display control circuit, 114 is an LPF for caption reduction processing, 1
Reference numeral 15 is a memory for temporarily holding subtitles, 116 is an LPF for subtitle enlargement processing, 117 is a contour LPF for adding contours to subtitles, 118 is a gain adjusting circuit, and 119 is a combining processing circuit. In this embodiment, as shown in FIG.
When moving / inserting the signal of the subtitle portion displayed at the bottom of the screen in movie size software as shown in FIG. 2C, an outline is added to the edge of the subtitle by using the LPF circuit 105 and the subtractor 106. At the same time as the addition, the nonlinear processing circuit 104 is used to relatively lower the signal level of the background of the caption so that only the caption in the signal of the caption portion can be reliably combined with the video signal. The operation of FIG. 1 will be described below with reference to FIGS. 5, 6, and 7, taking the case where the video signal of the form shown in FIG. 2A is input as an example.
Here, FIG. 5 shows a main part signal waveform in FIG. 1, and signals corresponding to a to g shown in FIG. 5 and symbols a to g in FIG.
It corresponds to the signal waveform of g. 6 shows an example of the non-linear processing characteristic of the non-linear processing circuit 104, and FIG. 7 shows an example of a circuit that realizes the non-linear processing shown in FIG.

A video signal of the form shown in FIG. 2A is input from the input terminal 101, and this video signal is input to the image quality improving circuit 103 and the character information signal processing circuit 102.

The image quality improving circuit 103 performs processing for displaying an NTSC signal having an aspect ratio of 4: 3 on a display device having an aspect ratio of 16: 9, and outputs it to the subtractor 106. At this time, the signal processing performed by the image quality improving circuit 103 is described in JP-A-1-194784 and JP-A-3-194784.
There is a time axis compression process, an expansion process, and the like shown in Japanese Patent Publication No. 11891, etc., and the aspect ratio is converted according to the display form of the input video signal. For example, when a normal video signal having an aspect ratio of 4: 3 is input as a display form of the input video signal, the image quality improving circuit 10
In No. 3, a time axis compression process using a memory is performed to compress the left and right sides of the screen, and an image with an aspect ratio of 4: 3 is reproduced on the display screen with an aspect ratio of 16: 9 without distortion. Also,
When the input video signal has a wide aspect display mode as shown in FIG. 2A, enlargement processing is performed and an image is reproduced to fill the screen as shown in FIG. 2B. Even if the enlargement processing at this time is enlargement by signal processing such as scanning line interpolation or pixel interpolation, the output terminal 1
The essence of the present invention does not change even if the display section provided after 09 is enlarged by deflection.

Further, in the image quality improving circuit 103, Japanese Patent Laid-Open No.
No. 2-249568, Japanese Patent Laid-Open No. 2323068, etc., the characteristics of the input signal are extracted, and image quality control according to the characteristics (for example, when the average level of the input signal is low, The essence of the present invention does not change even if the black level is relatively lowered and the reproduced image is sharpened.

The character information signal processing circuit 102 extracts the caption signal contained in the video signal, and enlarges or reduces it to output it.

In the character information signal processing circuit 102, the subtitle demodulation circuit 110 decodes and outputs subtitle information when it is included in the vertical blanking period. Further, the subtitle display control circuit 113 detects the aspect ratio of the screen and the presence or absence of subtitle information from the video signal input from the input terminal 101, and at the same time, the switch circuit 111 and the L for subtitle reduction.
The control signals of the PF 114, the memory 115, and the subtitle expanding LPF 116 are generated.

According to the control signal output from the subtitle display control circuit 113, the switch circuit 111 sets the x side when displaying the subtitle information included in the vertical blanking period, and sets the y side when not displaying. Operates to output selectively.

The subtitle magnification variable processing circuit 112 inputs the signal output from the switch circuit 111 according to the control signal output from the subtitle display control circuit 113, and enlarges or reduces the subtitle.

In the subtitle magnification variable processing circuit 112, the subtitle reduction processing LPF 114 is provided to prevent aliasing that occurs when the subtitle is reduced. For example, if the caption display control circuit 113 thins out the data of the caption portion to be written in the memory 115 to ½, the sampling frequency is also shifted to the original position of ½, which causes aliasing interference. Therefore, when performing the reduction processing, it is necessary to perform the LPF processing in advance according to the number of pixels / lines to be thinned. Therefore, when reducing the caption, according to the reduction ratio, according to the control signal from the caption display control circuit 113,
The pass band of the LPF 114 for subtitle reduction processing is changed.
Here, when the reduction ratio of the subtitle is 1, that is, when the number of pixels / lines to be thinned out is 0 (when the reduction process is not performed), the LPF 114 for the subtitle reduction process is in the through state.

Further, the subtitle moving process is usually performed by the above-mentioned FIG.
This is performed only when the video signal of the form shown in (a) is input. Therefore, when the 4: 3 video of a commercial or the like shifts to a signal of a movie or the like including subtitles, the memory 1 for moving subtitles is used.
A video signal other than the caption signal may be written in 15. Therefore, the caption display control circuit 113 detects the form (aspect ratio) of the input signal, and, for example, when the input signal is a 4: 3 video signal such as a commercial image,
When the video signal of the form shown in (a) (letterbox format signal including subtitles) is entered, control is performed so that the signal read from the subtitle moving memory 115 is not output for several frame periods.

The enlargement processing LPF 116 is provided to prevent distortion of the enlarged subtitle when the subtitle is enlarged.
For example, the data of the caption portion read from the memory 115 by the caption display control circuit 113 is doubled, that is, once every two times.
If the control is repeatedly read at a cycle of one time, the contour of the read subtitle becomes staggered in a staircase pattern. Therefore, when enlarging processing is performed, it is necessary to perform LPF processing (interpolation processing) according to the number of pixels / lines to be read repeatedly. Therefore, when enlarging subtitles, depending on the enlargement ratio,
In accordance with a control signal from the caption display control circuit 113, the pass band of the caption enlargement processing LPF 116 is changed. Here, the enlarging magnification of the subtitle is 1, that is, the pixel to be read out repeatedly.
When the number of lines is 0 (when the enlargement processing is not performed), the subtitle enlargement processing LPF 114 is in the through state.

The non-linear processing circuit 104 performs a non-linear (signal level conversion) process having the characteristic shown in FIG. 6 on the signal of the caption part which has been subjected to the above-mentioned signal process. (A) of FIG.
6B and 6C show an example of the non-linear processing characteristic of the non-linear processing circuit 104, and FIG. 7 shows an example of a circuit that realizes the non-linear processing characteristic of FIG.

In FIG. 7A, 701 is an input terminal,
Reference numerals 702 and 706 are flip-flops (hereinafter referred to as FF), 703 and 704 are AND gates, 705 is a selector, and 707 is an output terminal. Further, FIG. 7B shows the input / output of this circuit. Next, the operation of the circuit shown in FIG. 7A will be described.

When the ramp wave data shown in FIG. 7B is input from the input terminal 701, the most significant bit is in a high level period (a period of 8 to 15 and H of the selector 705 of FIG. 7).
(When the side is selected), the input signal is passed through as it is, and 0 to 3 out of the period when the most significant bit is at the low level (the period of 0 to 7 and the L side of the selector 705 of FIG. 7 is selected).
Up to 0 level by using the signal of the highest- (minus) first bit, and from 4 to 7 the lowest-1 b of the highest-1 bit.
Level conversion processing is performed so that it changes from 1 to 7.
That is, in the signal of the caption part, for the signal (caption) having a certain level or more, the signal is passed through in the through state as it is,
A signal having a level below a certain level (a signal of the caption background) is subjected to a process of relatively lowering the signal level to generate a non-linear processed signal c from the caption signal a. By performing such non-linear processing, even if the black level of the video signal becomes relatively low due to automatic image quality correction processing or the like (a in FIG. 5), the signal level of the caption background in the signal of the caption part is the video signal. It becomes possible to remove the noise component included in the signal of the subtitle background at the same time as the noise level does not exceed the level.

In the circuit shown in FIG. 7, the input signal is treated as 4 bits for the sake of simplification of description, but the present invention is not limited to this, and the essence of the present invention does not change even if it is configured with any number of bits. Absent. Although the circuit shown in FIG. 7A is given as an example of the circuit configuration for realizing the non-linear characteristic, the non-linear processing circuit having the characteristic shown in FIGS. 6B and 6C is also used by using the ROM or the like. It can be easily constructed, and the essence of the present invention does not change even if the characteristics are changed as necessary.

Even if the subtitle magnification variable processing circuit 112 and the non-linear processing circuit 104 described so far are replaced with each other, there is no difference in the effect obtained by the present invention, and the essence of the present invention. Does not change.

The contour LPF 117 performs LPF processing on the signal c of the caption portion which has been subjected to the above-described signal processing, and creates a caption signal d thicker than the original caption.

The gain adjusting circuit 118 creates a signal e by multiplying the caption signal d by α (α ≧ 1), taking into consideration that the contour signal level does not float when creating the contour of the caption.

The subtractor 106 subtracts the signal e from the video signal b. As a result, a subtitle that is thicker than the original subtitle and has a black level can be inserted into the video signal (signal f).

In the MAX circuit 107, the video signal in which the black level caption is inserted and the non-linearly processed caption signal c are input, and the larger one of the input signals is selectively output. A caption composite signal is obtained, and further clipped to a predetermined signal level by the clipping circuit 108 at the next stage to obtain a final caption composite output (signal g).

Here, the clipping level when the video signal is clipped by the clipping circuit 108 may be any signal level that does not affect the sync separation circuit (not shown) provided in the subsequent stage. The essence of the present invention does not change regardless of the signal level of the generated subtitle background or the pedestal level detected from the video signal. Further, the clipping circuit 108 has a signal level that does not affect the sync separation circuit (not shown) provided in the subsequent stage even if the signal level becomes too low when the signal e is subtracted from the video signal b. Since it suffices to be able to clip, the essence of the present invention does not change even if it is configured immediately after the subtractor 106.

As described above, the subtitle composite output in this embodiment is
As shown in g of FIG. 5, in the switching portion between the caption and the video signal, unlike the above conventional example, a smooth switching operation can always be performed at a point according to the level of the signal and the video signal of the caption part. At the same time, the contour can be added to the subtitle. In this way, it is possible to solve the conventional problem that the switching portion between the signal of the caption portion and the video signal has a sawtooth shape. Further, in the present embodiment, since the non-linear processing circuit 104 is provided to lower the signal level of the caption background, even if the automatic image quality correction processing or the like is performed by the image quality improvement circuit 103, the caption in the signal of the caption portion is surely obtained. Only that will be combined with the video signal.

Although the contour adding method in the horizontal direction has been described in this embodiment, it is needless to say that the contour can be added also in the vertical direction by performing the same processing as described above.

Next, FIG. 8 shows the second embodiment of the present invention.
Will be explained. FIG. 8 is a block diagram showing the second embodiment of the present invention.

In FIG. 8, parts designated by the same reference numerals as those in FIG. 1 operate in the same manner. Besides, 801 is a predetermined value setting unit, and 802 is a subtractor.

In the present embodiment, the non-linear processing is performed only on the subtitles in the signal of the subtitle section, so that the contour can be thicker and the subtitles to be inserted can be more sharply synthesized. There are features.

The operation of this embodiment will be described below with reference to FIG. FIG. 9 is a waveform diagram showing a main part signal waveform in FIG. 8, and the signals corresponding to symbols a to e shown in FIG. 8 and the signal waveforms of symbols a to e shown in FIG. 9 correspond to each other.

Unlike the first embodiment, the subtitle background signal input to the contour LPF 117 is not preliminarily subjected to the non-linear processing. Therefore, the subtitle background signal contains a noise component (signal a). ). Therefore, a predetermined value equal to or higher than the signal level of the caption background is subtracted from the caption signal d output from the contour LPF 117 to remove the noise component from the caption background signal. At this time, the predetermined value output from the predetermined value setting unit 801 may be a signal level slightly higher than the signal level of the caption background in the signal of the caption unit, and even if the caption background level is detected and set, Even at the set level, the essence of the present invention does not change.

The gain adjusting circuit 118 creates a signal e by multiplying the caption signal d by α (α ≧ 1).

The subtracter 106 subtracts the signal e from the video signal b and inserts a black level subtitle, which is thicker than that in the first embodiment, into the video signal.

On the other hand, the non-linear processing circuit 104 performs the non-linear (signal level conversion) as shown in FIG. 6 only for the signal of the caption portion output from the character information signal processing circuit 102 as in the first embodiment. ) Perform processing. As a result, only the caption in the signal of the caption portion is converted as shown in FIG. 9C (slender compared to the original caption, and the noise component is removed).

In the MAX circuit 107, as in the first embodiment, the video signal in which the black level caption is inserted and the non-linearly processed caption signal are input, and the larger one of the input signals is input. A subtitle composite signal is obtained by selectively outputting the signal, and further clipped to a predetermined signal level by the clipping circuit 108 in the next stage to obtain a subtitle composite output.

As described above, the subtitle composite output in this embodiment is
Compared with the first embodiment, by changing the configuration position of the nonlinear processing circuit 104, it is possible to obtain a subtitle with a thicker contour and a sharper subtitle composite output for the subtitle to be inserted.

In the above description of each embodiment, a horizontally long (wide) video signal such as movie software including subtitles, a video signal in which character information and the like are multiplexed in the vertical blanking period, etc. are input.
Although the signal processing device for inserting the above-mentioned caption or character information into the video signal has been described, the present invention is not limited to this. For example, the present invention can be applied even in the case of inserting character information such as temporary news, subtitle super, or telop into a video signal in a studio or the like. In this case, it is obvious that the same effect as each of the above-described embodiments can be obtained by directly inputting the signal including the various kinds of character information to the character information signal processing circuit 102 and performing the same processing as described above. Will.

[0052]

As described above, according to the present invention, it is possible to provide a video signal processing device capable of moving / inserting a high quality subtitle (character information) when processing a video signal containing character information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 shows a display form when horizontally long movie software is displayed on a screen with an aspect ratio of 4: 3 and a display form when the movie software is displayed on a wide screen with an aspect ratio of 16: 9. FIG.

FIG. 3 is an explanatory diagram for explaining signal processing in a conventional technique.

FIG. 4 is an explanatory diagram for explaining a problem in the conventional technique.

FIG. 5 is an explanatory diagram illustrating a first embodiment of the present invention.

FIG. 6 is an example of a non-linear characteristic of the non-linear processing circuit according to the first embodiment of the present invention.

FIG. 7 is an example of a circuit that realizes the nonlinear processing characteristic of the present invention.

FIG. 8 is a block diagram showing a second embodiment of the present invention.

FIG. 9 is an explanatory diagram for explaining a second embodiment of the present invention.

[Explanation of symbols]

 Reference numeral 101 ... Input terminal, 102 ... Character information signal processing circuit, 103 ... Image quality improving circuit, 104 ... Non-linear processing circuit, 105 ... LPF circuit, 106 ... Subtractor, 107 ... Maximum value selection output circuit, 108 ... Clip circuit, 109 ... Output terminal, 110 ... Subtitle demodulation processing circuit, 111 ... Switch circuit, 112 ... Subtitle magnification variable processing circuit, 113 ... Subtitle display control circuit, 114 ... Reduction processing LPF, 115 ... Memory, 116 ... Enlargement processing LPF, 117 ... LPF for contour, 118 ... Gain adjusting circuit, 119 ... Synthesis processing circuit, 801 ... Predetermined value setting unit, 802 ... Subtractor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobufumi Nakagaki Nobufumi Nakagaki, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Ltd., Hitachi Media Visual Media Research Laboratories (72) Takayuki Mori, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Stock company Hitachi Media Media Laboratory (72) Inventor Yumi Bando 292 Yoshida-cho, Totsuka-ku, Yokohama-shi Kanagawa Stock Company Hitachi Video Media Laboratory (72) Inventor Nao Suzuki 292 Yoshida-cho, Totsuka-ku Yokohama, Kanagawa Prefecture Stock Company Hitachi Image Information System

Claims (6)

[Claims] 1. A signal having a video signal and a signal including character information such as a caption (hereinafter referred to as a character information signal) provided in different sections is input, and the character is input from the section in which the character information signal exists. A video signal processing device for extracting an information signal, inserting character information contained in the character information signal into a section in which the video signal exists, and outputting the information signal, wherein the character information signal is extracted from the section in which the character information signal exists. Existing in the section in which the video signal exists, and a character information signal processing means for extracting, temporarily holding and outputting, and a non-linear processing means for receiving the output signal from the character information signal processing means and performing non-linear processing. An image quality improving means for extracting characteristics of a video signal and automatically converting a signal level or the like to improve image quality, an output signal from the image quality improving means and a character information signal output from the non-linear processing means are provided. A video signal processing apparatus comprising: a combination processing unit for inputting and combining. 2. A signal including a video signal and a character information signal in separate sections is input, the character information signal is extracted from a section in which the character information signal exists, and is included in the character information signal. A video signal processing device for inserting and outputting character information in a section in which the video signal exists, and a non-linear processing means for performing non-linear processing on an input signal,
Among the signals output from the non-linear processing means, the character information signal processing means for extracting the character information signal from the section in which the character information signal exists, temporarily holding and outputting the character information signal, and existing in the section in which the video signal exists. Image quality improving means for extracting the characteristics of the video signal to be converted and automatically converting the signal level etc. to improve the image quality, and the output signal from the image quality improving means and the character information output from the character information signal processing means. A video signal processing device, comprising: a synthesizing processing unit for inputting and synthesizing a signal. 3. The video signal processing apparatus according to claim 1 or 2, wherein said synthesizing processing means inputs a signal output from said non-linear processing means and extracts a low frequency component (hereinafter referred to as LPF). Means), subtraction means for inputting and subtracting the output signal from the image quality improving means and the low-frequency component of the character information signal output from the LPF means, and an output signal from the subtraction means. A video signal processing device, comprising: a maximum value selection output means for inputting the character information signal output from the non-linear processing means and selecting and outputting a signal having a higher signal level. . 4. A signal including a video signal and a character information signal in separate sections is input, and the character information signal is extracted from the section in which the character information signal exists, and is included in the character information signal. A video signal processing device for inserting and outputting character information in a section in which the video signal exists, wherein the character information signal is extracted from the section in which the character information signal exists, temporarily stored and output. A processing means, a non-linear processing means for inputting an output signal from the character information signal processing means to perform non-linear processing, and an LP for inputting an output signal from the character information signal processing means and extracting a low frequency component.
F means, image quality improving means for extracting the characteristics of the video signal existing in the section in which the video signal exists, and automatically converting the signal level etc. to improve the image quality, and output from the image quality improving means A signal and a low-frequency component of the character information signal output from the LPF means, subtracting and outputting the same, an output signal from the subtracting means, and a character information signal output from the non-linear processing means And a maximum value selecting / outputting means for selecting and outputting a signal having a larger signal level. 5. The video signal processing device according to claim 1, wherein the character information signal processing means inputs a character information signal and detects character information and an aspect ratio of a screen from the character information signal. And a character information demodulation means for inputting the character information signal and demodulating the character information when the character information is multiplexed within the vertical blanking period, and the caption display control. Switch means for inputting and outputting the output signal from the character information demodulating means and the character information signal in accordance with a control signal from the means, and an output signal from the switch means for inputting a vertical blanking period or an image. A video signal processing device, comprising: character information magnification varying means for varying the size of character information existing within a period. 6. The video signal processing device according to claim 5, wherein the character information magnification varying means inputs an output signal from the switch means in accordance with a control signal from the subtitle display control means, and displays the signal in a reduced size. If it does, the pass band changes according to the reduction ratio, and in other cases, the subtitle reduction LPF means for outputting the input signal as it is, and the subtitle reduction LPF means according to the control signal from the subtitle display control means. After inputting and temporarily holding the signal output from, the output is stopped for a certain time at the start of subtitle display, and at the same time, when the signal output from the LPF means for subtitle reduction is reduced and displayed, the signal is thinned out and written. Then, when the signal output from the LPF means for subtitle reduction is enlarged and displayed continuously, the signal is adjusted to a set magnification and fixed. When inputting an output signal from the character information delaying means in accordance with a control signal from the character information delaying means and the subtitle display control means for repeatedly reading out the signal and enlarging and displaying the signal, the pass band is changed in accordance with the enlargement magnification. A video signal processing device comprising: a subtitle enlarging LPF unit that changes and otherwise outputs an input signal as it is.