JPH0730812A - Title generator in zoom mode - Google Patents

Abstract

PURPOSE:To display a broadcast title character on a zoomed-up screen with an easy-to-see background color. CONSTITUTION:The generator is provided with a video/title separate section 1 separating a 1st video signal corresponding to a zoomed-up video portion from a 2nd video signal corresponding to a title from an input video signal 8, a video magnification processing section 2 magnifying the 1st video signal fully on a display screen whose aspect ratio is 16:9, a 1st delay section 3, a background color addition section 4 identifying the title character and the background video image in the 2nd video signal and generating a title video signal in which the background video image is replaced with a preset desired color, a title magnification processing section 5 magnifying its output title video signal in matching with an aspect ratio of the screen display portion, a 2nd delay section 6, and a changeover section 7 synthesizing a synthesis video signal 9 used to a picture based on the 1st video signal after magnification processing at a desired position on the display screen based on the 1st video signal after magnification processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for zooming in and displaying an image such as clear vision on a high-definition display screen, and displaying a subtitle display broadcast by clear vision at a desired position on the high-definition display screen. The present invention relates to a zoom mode caption generator.

[0002]

2. Description of the Related Art Conventionally, the image of clear vision broadcasting which has a 4: 3 aspect ratio and shows a movie etc. in which words are displayed in subtitles without dubbing foreign languages has an aspect ratio of 1
When zooming up to display a 6: 9 horizontally long high-definition display screen, the subtitle part comes out of the range of the display screen and disappears. Therefore, measures are taken to superimpose and display the subtitle characters on the zoomed-in high-definition display screen.For example, the image of the part where the white subtitle characters are superimposed and superimposed is white or a color close to white. As described above, there is a problem that the displayed subtitle characters are close to the background color, and the displayed subtitle characters are difficult to see.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a TV image having an aspect ratio of 4: 3 is zoomed up to be displayed on a high-definition screen and a desired position of the high-definition screen is displayed. It is an object of the present invention to provide a zoom mode caption generation device that displays caption characters with a back (background) color that is easy to see.

[0004]

In order to achieve the above object, a first video signal corresponding to a first display screen portion and a second video image corresponding to a second display screen portion from an input video signal. A video / caption separation unit that separates the signals and outputs each, a video enlargement processing unit that enlarges the first video signal according to the aspect ratio of the display screen, and the first video after the enlargement processing. A first delay unit for delaying the signal for a predetermined time, and a background color for generating and outputting a caption video signal in which the caption characters of the second video signal and the background video are identified and the background video is replaced with a specified color. An adding unit, a subtitle enlargement processing unit that performs enlargement processing for displaying the subtitle video signal on a screen portion having a predetermined aspect ratio, a second delay unit that delays the subtitle video signal after the enlargement processing for a predetermined time, Based on the first video signal after the enlargement processing Synthesizing the composite video signal for producing an image fitting the image based on the caption video signal after enlarging processing in desired position of 示画 surface made from the switching unit to be output.

[0005]

With the above-described structure, the video / caption separating unit counts the number of scanning lines, for example, and calculates the zoomed-in video signal (first video signal) and the video of the caption portion from the input video signal. The signal (second video signal) is separated. The background color adding unit determines the character signal portion of the video signal of the subtitle portion based on, for example, a predetermined reference level and replaces the background color portion with a desired color.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom mode caption generator according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an embodiment for realizing a zoom mode caption generation device according to the present invention. Reference numeral 1 denotes a video / caption separation unit that separates a first video signal corresponding to the zoomed-in video portion and a second video signal corresponding to the subtitle portion from the input video signal 8 and outputs each of them. Reference numeral 2 denotes an image enlargement processing unit for performing enlargement processing such as scanning line interpolation and pixel interpolation in order to display the first image signal by zooming it up to fill a horizontally long HDTV display screen with an aspect ratio of 16: 9. Reference numeral 3 is a first delay unit that delays the first video signal after the enlargement processing for a predetermined time. Reference numeral 4 identifies the subtitle characters of the second video signal and the background video based on a preset signal level, and generates and outputs a subtitle video signal in which the background video is replaced with a preset desired color. This is a background color adding section. 5 is the background color adding unit 4
Is a subtitle enlargement processing unit that performs enlargement processing such as scanning line interpolation and pixel interpolation according to the aspect ratio of the screen display portion. A second delay unit 6 delays the enlarged subtitle video signal for a predetermined time. 7
Is a switching unit for synthesizing and outputting a composite video signal 9 for generating an image in which an image based on the subtitle video signal after the enlargement processing is fitted at a desired position on the display screen based on the first video signal after the enlargement processing. Is.

FIG. 2 shows an embodiment of a background color adding section in the zoom mode subtitle generating apparatus according to the present invention. 10
Is a background color signal generation unit that generates a background color signal generated by selecting a hue and brightness such that subtitle characters are easy to read, for example, by supplying a required voltage level for each primary color signal. Reference numeral 11 is a gate that allows the output of the background color signal generator 10 to pass therethrough in accordance with the timing of the display position on the display screen. Reference numeral 17 denotes a second video signal in which the caption character signal is superimposed on the background video signal separated and output by the video / caption separation unit 1 (FIG. 1). Reference numeral 12 is a predetermined reference level set to separate the background video signal and the subtitle character signal of the second video signal 17. Reference numeral 13 is a comparator which compares the second video signal 17 with the reference level 12 and outputs a control signal 16 of logic "H" when the second video signal 17 is higher than the reference level 12, for example. . 14 is a state in which the background color signal output from the background color signal generation unit 10 and the second video signal 17 are input,
When the control signal 16 is logic "H", for example, the second video signal 17 is selected and output, and when the control signal 16 is logic "L", a background color signal is output to provide an easily readable background. It is a selector that generates the closed caption video signal 15.

The operation of the zoom mode caption generator according to the present invention will be described. FIG. 3 is a conceptual diagram showing identification of characters and a background of the zoom mode caption generation device according to the present invention. The video signal of one scanning line of the subtitle portion is composed of a background video signal and a character video signal having a higher level than that. A character portion or a background portion can be identified by setting a reference level of a predetermined magnitude and comparing the reference level with the video signal. FIG. 4 is an example of a display screen based on a caption video signal output by the zoom mode caption generation device according to the present invention. In the figure (a), in the center of a horizontally long high-definition display screen having an aspect ratio of 16: 9, there is a zoomed-in video portion E1, a video portion E2 that is discarded due to zoom-up and is not displayed, and a subtitle portion E3 that is not displayed. This is an example of displaying a clear vision screen having an aspect ratio of 4: 3. The figure (b) shows the zoomed-in video portion E1 based on the signal separated by the video / caption separation unit 1 shown in FIG. A subtitle display screen (subtitle display and its background color) based on the subtitle video signal 15 having a background of a color that is easy to read by replacing with a color is displayed below the high-definition display screen. When a clear vision screen without subtitles is zoomed up and displayed on the high definition display screen, an instruction signal is given to the synthesizing unit 5 (FIG. 1) to allow the output of the image enlargement processing unit 2 to pass through as it is. To do so.

[0009]

As described above, according to the present invention, a television image having an aspect ratio of 4: 3 is zoomed up to be displayed on a high-definition screen, and a color which is easy to see at a desired position on the high-definition screen is backed (background). Provided is a zoom mode caption generation device for displaying captioned characters. Therefore, on the zoomed up HD screen,
Regardless of the pattern or color of the displayed image, there is an advantage that the subtitles displayed by moving are always easy to read.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment for realizing a zoom mode caption generation device according to the present invention.

FIG. 2 is an example of a background color adding section in the zoom mode caption generation device according to the present invention.

FIG. 3 is a conceptual diagram showing identification of characters and background of the zoom mode caption generation device according to the present invention.

FIG. 4 is an example of a display screen based on a caption video signal output by the zoom mode caption generation device according to the present invention.

[Explanation of symbols]

 1 Video / Subtitle Separation Section 2 Video Enlargement Processing Section 3 First Delay Section 4 Background Color Adding Section 5 Subtitle Expansion Processing Section 6 Second Delay Section 7 Switching Section 8 Video Signal 9 Composite Video Signal 10 Background Color Signal Generation Section 11 Gate 12 Reference level 13 Comparator 14 Selector 15 Caption video signal 16 Control signal 17 Second video signal

Claims (3)

[Claims] 1. A video / video which separates a first video signal corresponding to a first display screen portion and a second video signal corresponding to a second display screen portion from an input video signal and outputs them separately. A subtitle separation unit, a video enlargement processing unit that enlarges the first video signal in accordance with an aspect ratio of a display screen, and a first delay unit that delays the first video signal after the enlargement process for a predetermined time. A background color adding unit for generating and outputting a caption video signal in which the caption characters of the second video signal and the background video are identified and the background video is replaced with a specified color; Based on the subtitle enlargement processing unit for performing enlargement processing for displaying on the screen portion of the ratio, the second delay unit for delaying the subtitle video signal after the enlargement processing for a predetermined time, and the first video signal after the enlargement processing Subtitle image after enlargement processing at the desired position on the display screen A zoom mode caption generation device comprising a switching unit that combines and outputs a composite video signal that generates an image in which an image based on an image signal is embedded. 2. A background color signal generator for supplying a required voltage level, a gate for outputting the voltage level to a next stage at a required timing, a second video signal and a predetermined signal. The zoom mode caption generation according to claim 1, comprising a comparator that compares a reference level and a selector that selects the second video signal and a predetermined background color signal based on an output of the comparator. apparatus. 3. The zoom mode caption generation device according to claim 1, wherein the video signals are not combined based on an instruction signal supplied from the outside to the switching unit, and one of the input video signals is output as it is. .