CN101227566A - Caption display method and system - Google Patents

Abstract

The invention discloses a subtitle display method and system. Wherein, the subtitle display method includes the following steps: the main control chip generates subtitle content to be displayed, and writes the subtitle content to be displayed into a corresponding memory area of the media processing chip; the main control chip sends a content display instruction to the media processing chip; In response to the content display instruction, the media processing chip extracts the subtitle content to be displayed from the corresponding memory area, and superimposes the subtitle content to be displayed on the video image for display. Through the present invention, multiple pieces of subtitle content can be superimposed on the video image at the same time, thereby providing users with intuitive and as rich information as possible.

Description

Caption display method and system

technical field

The present invention relates to the field of video surveillance, and more particularly relates to a subtitle display method and system.

Background technique

At present, the video surveillance system is developing rapidly in the international and domestic markets, and telecom operators and equipment suppliers are investing manpower in the promotion of the video surveillance system. The most widely distributed and largest number of equipment in the video surveillance system is the monitoring front end, which is mainly used to collect and encode video signals through the camera, send the video bit rate to the video surveillance system platform or client, and record according to the configuration. It is the most important equipment in the video surveillance system. The monitoring front-ends are distributed in different places, in different time zones, and in different states. Therefore, in order to allow users to intuitively understand these various information, it needs to be displayed in blocks on the video image, which requires the monitoring front-end to support multi-region superimposition of subtitles.

Contents of the invention

The present invention provides a method and system for displaying subtitles, so as to superimpose multiple pieces of subtitle content on video images at the same time, so as to provide users with intuitive and as rich information as possible.

The subtitle display method according to the embodiment of the present invention comprises the following steps: the main control chip generates the subtitle content to be displayed, and writes the subtitle content to be displayed into the corresponding memory area of the media processing chip; the main control chip sends the content to the media processing chip Display instruction: the media processing chip responds to the content display instruction, extracts the subtitle content to be displayed from the corresponding memory area, and superimposes the subtitle content to be displayed on the video image for display.

The subtitle display method according to the embodiment of the present invention further includes the following steps: the main control chip sends a content erasing instruction to the media processing chip; the media processing chip stops extracting the subtitle content to be displayed from the corresponding memory area in response to the content erasing instruction.

Wherein, the process that the main control chip writes the subtitle content to be displayed in the corresponding memory area of the media processing chip includes: the main control chip obtains the first address of the entire memory area of the media processing chip; Display the location and the first address of the entire memory area of the media processing chip, and obtain the address of the corresponding memory area; and the main control chip writes the subtitle content to be displayed into the corresponding memory area according to the address of the corresponding memory area.

Wherein, the content display command carries the address information of the corresponding memory area, and the media processing chip extracts the subtitle content to be displayed from the corresponding memory area according to the address information of the corresponding memory area. The content erasing command carries the address information of the corresponding memory area, and the media processing chip stops extracting the subtitle content to be displayed from the corresponding memory area according to the address information of the corresponding memory area.

Wherein, the main control chip writes the subtitle content to be displayed into the corresponding memory area by means of shared memory. Before the main control chip writes the content of the subtitle to be displayed into the corresponding memory area, it converts the content of the subtitle to be displayed into a dot matrix.

The subtitle display system according to the embodiment of the present invention includes: a subtitle generation unit, used to generate the subtitle content to be displayed, and write the subtitle content to be displayed in the corresponding memory area of the subtitle storage unit; The display unit sends the content display instruction; and the subtitle display unit is used to respond to the content display instruction, extract the subtitle content to be displayed from the corresponding memory area of the subtitle storage unit, and superimpose the subtitle content to be displayed on the video image for display .

The subtitle display system according to the embodiment of the present invention further includes: an erasure instruction unit, configured to send a content erasure instruction to the subtitle display unit. The subtitle display unit according to the embodiment of the present invention is further configured to stop extracting the subtitle content to be displayed from the corresponding memory area of the subtitle storage unit in response to the content erasure instruction.

Through the present invention, multiple pieces of subtitle content can be superimposed on the video image at the same time, thereby providing users with intuitive and as rich information as possible.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the overall flowchart of the subtitle display method according to the embodiment of the present invention;

Fig. 2 is a schematic flow chart of the process in which the media chip opens up a memory space for storing subtitle content according to an embodiment of the present invention, and the main control chip obtains the first address of this memory;

3 is a schematic flow diagram of a process in which the main control chip controls the media processing chip to superimpose subtitles on the video image according to an embodiment of the present invention;

4 is a schematic flow chart of the process in which the main control chip controls the media processing chip to delete subtitles according to an embodiment of the present invention; and

FIG. 5 is a logical block diagram of a subtitle display system for realizing the above process.

Detailed ways

The specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is an overall flowchart of a subtitle display method according to an embodiment of the present invention. As shown in Figure 1, the method includes the following steps: S102, the main control chip generates subtitle content to be displayed, and writes the subtitle content to be displayed to a digital signal processing (DSP) chip (that is, a media processing chip) through a shared memory mode ) in the corresponding memory area (wherein, assuming that there are N blocks of areas that need superimposing subtitles, then apply for N blocks of memory of appropriate size on the DSP chip side to store subtitle content); S104, the main control chip sends a message to the DSP chip , instructing the DSP chip to read the corresponding memory; and S106 , the DSP chip superimposes the subtitle on the video image for display according to the coordinate position in the message.

Wherein, when the main control chip sends a message to the DSP chip to order the DSP chip to cancel displaying the corresponding subtitle content, the DSP chip no longer reads the corresponding memory, so that the subtitle information that has been superimposed on the video image can be erased.

The specific implementation of the present invention will be further described below by taking the 6834 main control chip and the DM642DSP chip as examples.

Fig. 2 is a schematic flowchart of the process of opening up memory space for storing subtitle content by the DSP chip according to an embodiment of the present invention. As shown in Figure 2, this process comprises the following steps: S202, open up some space in the internal memory of DM642 media processing chip for storing subtitles, assuming there are N subtitles, then you can apply for N continuous memory spaces; S204, 6834 The main control chip obtains the first address ADDRESS1 of the mapping address of the subtitle shared memory developed by the DM642 media processing chip through the function provided by the driver.

Fig. 3 is a schematic flowchart of a process in which a main control chip controls a media processing chip to superimpose subtitles on a video image according to an embodiment of the present invention. As shown in Figure 3, this process includes the following steps: S302, converting the subtitles to be displayed into a dot matrix; S304, the 6834 main control chip obtains the first address ADDRESS1 of the subtitle shared memory of the DM642 media processing chip through the drive, and then displays according to the Calculate the offset ADDRESS2 of the subtitle storage memory address and the first address in the specific area position of the subtitle, thereby drawing the address of the current subtitle storage is (ADDRESS1+ADDRESS2), and write the subtitle dot matrix generated in the corresponding memory to go; S306, After the subtitles are written successfully, send a message to notify the DM642 media processing chip to fetch the subtitle dot matrix from the corresponding memory; corresponding position.

Fig. 4 is a schematic flowchart of a process in which the main control chip controls the media processing chip to delete subtitles according to an embodiment of the present invention. As shown in Figure 4, this process comprises the following steps: S402, the 6834 master control chip sends a message to notify the DM642 media processing chip to erase the subtitles at the specified position; S404, the DM642 media processing chip no longer superimposes the subtitle dot matrix at the specified position on the on the video image, thereby achieving a wipe effect.

FIG. 5 is a logical block diagram of a subtitle display system for realizing the above process. As shown in Figure 5, the system includes: a subtitle generation unit 502, which is used to generate the subtitle content to be displayed, and write the subtitle content to be displayed in the corresponding memory area of the subtitle storage unit; a display indication unit 504, which is used to The subtitle display unit sends the content display instruction; and the subtitle display unit 506 is used to respond to the content display instruction, extract the subtitle content to be displayed from the corresponding memory area of the subtitle storage unit, and superimpose the subtitle content to be displayed on the video image display.

The subtitle display system according to the embodiment of the present invention further includes: an erasure instruction unit, configured to send a content erasure instruction to the subtitle display unit. The subtitle display unit according to the embodiment of the present invention is further configured to stop extracting the subtitle content to be displayed from the corresponding memory area of the subtitle storage unit in response to the content erasure instruction.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (10)

1. a caption presentation method is characterized in that, may further comprise the steps:

Main control chip generates the caption content that will show, and the described caption content that will show is write in the correspondence memory zone of media processing chip;

Described main control chip sends the content idsplay order to described media processing chip;

Described media processing chip is in response to described content idsplay order, extracts the described caption content that will show from described correspondence memory zone, and the described caption content that will show is added to shows on the video image.

2. caption presentation method according to claim 1 is characterized in that, and is further comprising the steps of:

Described main control chip sends content to described media processing chip and wipes indication;

Described media processing chip is wiped indication in response to described content, stops to extract from described correspondence memory zone the described caption content that will show.

3. caption presentation method according to claim 2 is characterized in that, the process that described main control chip writes the described caption content that will show in the correspondence memory zone of described media processing chip comprises:

Described main control chip obtains the first address of the whole region of memory of described media processing chip;

Described main control chip obtains the address in described correspondence memory zone according to the first address of the whole region of memory of the display position of the described caption content that will show and described media processing chip; And

Described main control chip writes the described caption content that will show in the described correspondence memory zone according to the address in described correspondence memory zone.

4. caption presentation method according to claim 3, it is characterized in that, described content idsplay order carries the address information in described correspondence memory zone, described media processing chip according to the address information in described correspondence memory zone from the described caption content that will show of described correspondence memory extracted region.

5. caption presentation method according to claim 4, it is characterized in that, described content erasing instruction carries the address information in described correspondence memory zone, and described media processing chip stops to extract the described caption content that will show according to the address information in described correspondence memory zone from described correspondence memory zone.

6. according to each described caption presentation method in the claim 1 to 5, it is characterized in that described main control chip writes the described caption content that will show in the described correspondence memory zone by the mode of shared drive.

7. caption presentation method according to claim 6 is characterized in that, described main control chip converted the described caption content that will show to dot matrix before writing the described caption content that will show in the described correspondence memory zone.

8. a caption display system is characterized in that, comprising:

The captions generation unit is used to generate the caption content that will show, and the described caption content that will show is write in the correspondence memory zone of captions memory cell;

Show indicating member, be used for sending the content idsplay order to the captions display unit;

The captions display unit is used in response to described content idsplay order, extracts the described caption content that will show from the correspondence memory zone of described captions memory cell, and the described caption content that will show is added to shows on the video image.

9. caption display system according to claim 8 is characterized in that, also comprises:

Wipe indicating member, be positioned at described main control chip side, be used for sending content and wipe indication to described captions display unit.

10. caption display system according to claim 9 is characterized in that, described captions display unit also is used for wiping indication in response to described content, stops to extract from the correspondence memory zone of described captions memory cell the described caption content that will show.

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