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Method and device for video data acquisition

A technology of video data and collection method, which is applied in the field of video data collection method and device, can solve problems such as collection and inability to correctly carry out video signals, and achieve the effect of avoiding error accumulation

Inactive Publication Date: 2014-12-10
CHINA SECURITY & FIRE TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a method and device for collecting video data, which is used to solve the problem that once a collection error occurs when the video source signal is abnormal in the prior art, even after the video source signal returns to normal, the video signal cannot be correctly processed. acquisition problem

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  • Method and device for video data acquisition
  • Method and device for video data acquisition
  • Method and device for video data acquisition

Examples

Experimental program
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Embodiment 1

[0059] Embodiment 1 of the present invention provides a method for collecting video data, the flow chart of which is as follows figure 1 As shown, it specifically includes the following steps:

[0060] Step 101: Determine the currently required video resolution, which is the video resolution in the currently required video format;

[0061] Step 102: monitor the effective amount of video data in real time according to the synchronous signal of the video during the acquisition process;

[0062] The synchronization signal includes: SAV code and EAV code.

[0063] Wherein, the effective amount may refer to the effective data amount of each line of video data, or may refer to the number of effective data lines of one frame of video data;

[0064] And in this step 102, can monitor the effective amount of video data of each row; also can monitor the effective amount of video data of the preset row, for example, every other row or two rows are valid for row video data It can also m...

Embodiment 2

[0095] Such as image 3 It is a schematic structural view of the video acquisition system in Embodiment 2 of the present invention, including: camera 31, SAA7115 chip 32, Field Programmable Gate Array (FPGA) 33, Programmable Read-Only Memory (Programmable Read-Only Memory, PROM) 34, Static Random Access Memory (SRAM) 35 and subsequent processing module 36;

[0096] Among them, the analog video adopts SAA7115 chip 32 for analog-to-digital conversion, and the data video output format can be BT.6568bit YCbCr4:2:2 by configuring the working mode of SAA7115;

[0097] FPGA33 is the main processor, which collects digital video data in BT.6568bit YCbCr4:2:2 format after analog-to-digital conversion in real time;

[0098] PROM 34 and SRAM 35 assist FPGA to realize video data acquisition.

[0099] exist image 3 On the basis of the hardware of the video capture system shown, the video capture method in Embodiment 2 of the present invention can be implemented, and of course the soluti...

Embodiment 3

[0122] Based on the same inventive concept as that of Embodiment 1 of the present invention, Embodiment 3 of the present invention provides a video data collection device, the structural diagram of which is shown in Figure 8 As shown, the device includes: a resolution determination unit 81 and a first monitoring unit 82, a judging unit 83 and a first execution unit 84; wherein:

[0123] A resolution determination unit 81 is configured to determine the currently required video resolution, which is the video resolution in the currently required video format;

[0124] The first monitoring unit 82 is used to monitor the effective amount of video data in real time according to the synchronization signal of the video during the acquisition process;

[0125] A judging unit 83, configured to judge whether the effective amount of the monitored video data is consistent with the amount of data represented by the value included in the currently required video resolution;

[0126] The firs...

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Abstract

The invention discloses a method and a device for video data acquisition. The method comprises the following steps of: determining the current needed video resolution; monitoring the effective quantity of the video data in real time during an acquisition process according to the synchronization signal of a video, and judging whether the effective quantity of the monitored video data is the same as the data quantity represented by the value comprised by the current needed video resolution; if the effective quantity is different from the data quantity is different, processing the video data according to the relationship between the effective quantity of the monitored video data and the data quantity represented by the value comprised by the current needed video resolution. Because the effective quantity of the monitored video data is monitored in real time by virtue of the synchronization signal of the video during the video acquisition process, whether the effective quantity of the monitored video data is the same is determined according to the video resolution, and if not, processing is carried out, error accumulation due to data dislocation is avoided, thus when a video signal source recovers normal, acquisition errors cannot influence the subsequent acquisition for the video signal.

Description

technical field [0001] The invention relates to digital signal processing technology, in particular to a method and device for collecting video data. Background technique [0002] The main function of video data acquisition (Video Capture) is to convert the analog video signal output by the camera, video recorder, and TV into a digital video signal for subsequent processing and transmission. [0003] General-purpose embedded processors tend to use more on-chip storage resources than dedicated video processors, which is very helpful for improving system performance. However, the shortcoming of general-purpose processors is that there is no special video acquisition interface. Since the field-programmable gate array (Field-Programmable Gate Array, FPGA) has the characteristics of flexible interface expansion, therefore, the embedded video processing currently used Most of the systems use FPGA+general-purpose processor architecture. [0004] Real-time video acquisition can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/91
Inventor 贾惠柱李辉勇解晓东宋磊
Owner CHINA SECURITY & FIRE TECH GRP
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