CN201360317Y

CN201360317Y - Character superimposing device

Info

Publication number: CN201360317Y
Application number: CNU2008201808415U
Authority: CN
Inventors: 肖阳辉; 佟新鑫; 张克宇
Original assignee: Shenyang Institute of Automation of CAS; China North Industries Corp
Current assignee: Shenyang Institute of Automation of CAS; China North Industries Corp
Priority date: 2008-12-09
Filing date: 2008-12-09
Publication date: 2009-12-09
Anticipated expiration: 2018-12-09

Abstract

The utility model provides a character superimposing device, which comprises a video decoding module (7), a video streaming buffer (8), a character streaming buffer (6), a character superimposing module (9), a video coding module (10), a central processor (1), a direct memorizer access controller (5), a character frame buffer (3), a nonvolatile storage (2) and a tri-state bus bridge (4), wherein the video decoding module (7) converts analog video signals into digital video data which is stored in the video streaming buffer; the central processor (1) generates character data according to received display commands and stores the character data into the character frame buffer (3) by the tri-state bus bridge (4); the central processor (1) starts the direct memorizer access controller (5) and stores the character data in the character frame buffer (3) into the character streaming buffer (6) by the tri-state bus bridge (4); the character superimposing module (9) inserts the character into a digital video streaming which is converted into the analog video signals for outputting by the video coding module (10). The character superimposing device is designed by adopting an ultra large scale integrated circuit, is characterized by low cost, few energy consumption, fast speed, little time-delay, simplicity, easily use, and the like, and can be widely applied in fields such as video processing and communication, computer vision, and the like.

Description

A kind of character stacking apparatus

Technical field

The utility model relates to a kind of character stacking apparatus, can be applied to Video processing and communicate by letter, fields such as computer vision.

Background technology

Overlaying character has crucial value in video, can realize human-computer interaction functions such as target label and parameter demonstration.The character superimposing technique relates to technology such as very lagre scale integrated circuit (VLSIC), Digital Signal Processing, Digital Video Processing and graphical user interface.

Summary of the invention

For with character overlaying function modularization, and be applied to the real-time video treatment system, the character stacking apparatus that the utility model proposes has the character drawing engine, can send establishment, editor, renewal and the demonstration that order realizes character by the external host communication interface, is simple and easy to use.

The technical scheme that its technical problem that solves the utility model adopts is: the character stacking apparatus that the utility model proposes is deposited (3), nonvolatile memory (2) and tristate bus line bridge (4) by video decode module (7), video flowing buffer memory (8), character stream buffer memory (6), character laminating module (9), video encoding module (10), central processing unit (1), direct memory access controller (5), character frame and is formed.

Video decode module (7) will be converted to digital of digital video data by the analog video signal of video input interface (I1) input, and deposit it in video flowing buffer memory (8); System program leaves in the nonvolatile memory (2); Central processing unit (1) operational system program generates character data according to the display command received from host communication interface (I2), and deposits it in character frame by tristate bus line bridge (4) and deposit (3); Character data during central processing unit startup direct memory access controller (5) is deposited the character frame by tristate bus line bridge (4) deposits character stream buffer memory (6) in; Character laminating module (9) reads video flowing buffer memory (8) and character stream buffer memory (6) synchronously, and character is inserted in the digital video frequency flow, passes through video encoding module (10) again and digital video frequency flow is converted to analog video signal exports video output interface (I3) to.Video flowing buffer memory and character stream buffer memory are push-up storage (FIFO), nonvolatile memory is the FLASH memory, the character frame saves as static random access memory (SRAM), video decode module and video encoding module are dedicated video coding and decoding device, and video flowing buffer memory, character stream buffer memory, character laminating module, direct memory access controller and tristate bus line bridge are gone up at a slice programmable logic device (PLD) and realized.Host communication interface is universal asynchronous serial interface (UART).

It is low to the utlity model has cost, and power consumption less, speed is fast, time-delay is little and be simple and easy to the advantage of usefulness.

Description of drawings

Fig. 1 is a character stacking apparatus composition frame chart.

Embodiment

At first, (3) are deposited as the character frame in one section memory block of application in static random access memory.Central processing unit (1) receives the display command that host communication interface (I2) is sent, and deposits establishment, editor and the renewal operation of finishing character in (3) at the character frame.

Secondly, video decode module (7) is finished the conversion of analog video to digital video, and exports video flowing buffer memory (8) to;

Once more, central processing unit (1) starts character data and the digital video frequency flow that direct memory access controller (5) deposits the character frame in (3) and exports character stream buffer memory (6) to.Digital video frequency flow and character stream enter character laminating module (9) synchronously, and the character laminating module is inserted into character data in the video data, the digital video frequency flow of the character that obtained superposeing.

At last, be converted to analog video signal and export video output interface (I3) to through video encoding module (10) the character digital video frequency flow that will superpose.

Claims

1. character stacking apparatus, it is characterized in that: the video decode module will be converted to digital of digital video data from the analog video signal of video input interface, and deposit it in video flowing buffer memory, system program leaves in the nonvolatile memory, central processing unit operational system program, generate character data according to the display command of receiving from host communication interface, and deposit it in character frame by the tristate bus line bridge and deposit, character data during central processing unit startup direct memory access controller is deposited the character frame by the tristate bus line bridge deposits the character stream buffer memory in, the character laminating module reads video flowing buffer memory and character stream buffer memory, character stream is inserted in the digital video frequency flow, through video encoding module digital video frequency flow is converted to analog video signal again and exports video output interface to.

2. character stacking apparatus according to claim 1, it is characterized in that: video flowing buffer memory and character stream buffer memory are push-up storage (FIFO), nonvolatile memory is the FLASH memory, the character frame saves as static random access memory (SRAM), video decode module and video encoding module are dedicated video coding and decoding device, video flowing buffer memory, character stream buffer memory, character laminating module, direct memory access controller and tristate bus line bridge are gone up at a slice programmable logic device (PLD) and are realized that host communication interface is universal asynchronous serial interface (UART).