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High-precision synchronous multi-channel image acquisition system and its time synchronization method

An image acquisition system, high-precision synchronization technology, applied in the direction of image communication, TV system components, color TV components, etc. Accuracy and other issues, to achieve the effect of concise and clear time stamp mark, good economic and social benefits, and simple synchronization

Active Publication Date: 2019-12-17
SHENZHEN NANHANG ELECTRONICS IND
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Problems solved by technology

[0006] Existing video acquisition and recording equipment mainly adopts the "passive" synchronization method. Each video acquisition unit synchronizes with the system time through a time synchronization protocol such as NTP. The time synchronization accuracy is not high, generally around 10ms. After the image is captured, the system time is acquired by software and time stamped. The acquired system time stamp is inaccurate and cannot be accurately synchronized with the aircraft system time
In addition, the exposure time of each camera itself is independent and uncontrolled, so the time synchronization accuracy between the video images of each channel is low

Method used

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  • High-precision synchronous multi-channel image acquisition system and its time synchronization method

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Embodiment Construction

[0032] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0033] Such as figure 1 and figure 2 As shown, the application in the aircraft system is taken as an example. A high-precision synchronous multi-channel image acquisition system includes: a time source, which is used to provide a synchronous pulse signal and a synchronous time signal. In this embodiment, the time source is a time source for decoding the aircraft IRIG-B time source, including an aircraft IRIG-B time source and a decoding unit, and the decoding unit is used to decode the IRIG-B time source signal and output RS485 Synchronize time signal and TTL full second pulse signal to multiple video acquisition units. Wherein, the TTL full second pulse signal is a TTL level signal composed of multiple second pulses. Of course, in addition to the TTL full-second pulse signal, other signals can also b...

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Abstract

The invention discloses a high-precision synchronous multi-channel image acquisition system and a method thereof. The system comprises a time source, a plurality of video acquisition units and a plurality of cameras. The method comprises six steps. According to the high-precision synchronous multi-channel image acquisition system and the method, synchronous time signal synchronization camera shooting is adopted for trigger signals, strict synchronization of shooting moments (exposure moments) of multi-channel cameras is achieved, the shooting moments are strictly synchronous with time of a time source, and the requirement for high-precision multi-channel synchronous image acquisition is met; timestamp information of trigger pulses is recorded, so that timestamps marked by images are the shooting moments, the timestamp marking precision is improved, follow-up information extraction and measurement analysis of multi-channel images are facilitated, and the good economic and social benefits are obtained.

Description

technical field [0001] The present invention relates to the field of image acquisition, in particular to a high-precision synchronous image acquisition system, and also relates to a time synchronization method for the image acquisition system. Background technique [0002] TTL: Transistor-transistor logic level, usually data representation adopts binary regulations, such as +5V is equivalent to logic "1", 0V is equivalent to logic "0", this is called TTL signal system, which is controlled by computer processor A standard technique for communication between various parts within a device. [0003] RS485: A typical serial communication standard. [0004] IRIG-B: B-type code, the time frame rate is 1 frame / s, and can transmit 100-bit information. As a widely used time code, the B-type code has the characteristics of carrying a large amount of information, high resolution, suitable for long-distance transmission, standardized interface, and international use. [0005] With the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N5/04
Inventor 陈辉陈高鹏韩向伟王海蛟
Owner SHENZHEN NANHANG ELECTRONICS IND
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