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Active light source-based image acquisition method and system

An active light source and image acquisition technology, applied in the field of infrared imaging, can solve problems such as insufficient infrared imaging quality, and achieve the effects of improving the quality of active infrared imaging, simple and effective design, and good image foundation

Inactive Publication Date: 2012-11-07
NANJING UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of insufficient infrared imaging quality, and propose an effective image acquisition method and device based on active light source, which focuses on solving the problem of synchronous control of active infrared light source and image sensor, so that the exposure of image sensor and active The luminous synchronization of infrared light sources; and for the influence of image quality under different lighting conditions, adaptive light intensity control is adopted to obtain high-quality infrared imaging

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  • Active light source-based image acquisition method and system
  • Active light source-based image acquisition method and system

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Embodiment Construction

[0027] 1) Implementation use cases of internal synchronization:

[0028] Principle: Extract the synchronization signal of the analog video signal output by the analog camera, and then control the lighting timing of the active infrared light source.

[0029] In this example, the image sensor is an ordinary analog camera, and the video output signal is generally a composite video broadcast signal (CVBS, Composite Video Broadcast Signal) or a composite video blanking and synchronization (Composite Video Blanking and Sync), and the composite video contains color difference and brightness information , and synchronize them in the blanking pulse to transmit data in an analog waveform. The CVBS signal is the traditional image data transmission method of the TV signal of the National Television Standards Committee of the United States.

[0030] The basic idea of ​​this implementation example is to extract the synchronous signal used to control image acquisition from the output signal...

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Abstract

The invention discloses an active light source-based image acquisition method and a system. The method comprises the time sequence synchronism of an active infrared light source and an image sensor, as well as self-adaptation image intensity control. The system comprises four parts including an active infrared light source unit, a synchronism and light intensity control unit, a self-adaptation synchronism and light intensity detection unit and an image sensor unit. According to the invention, aiming at requirement of high quality infrared imaging and considering influence of different lighting and time sequence control on the quality of the image, the active infrared imaging quality is well ameliorated via solving the problems of the matching and light intensity regulation of the active infrared light source and the image sensor in the active imaging system, and favorable image basis is provided for subsequent image processing system and operation.

Description

1. Technical field [0001] The invention belongs to the technical field of infrared imaging, and specifically relates to an image acquisition method and device based on an active light source. Light intensity control for high quality infrared imaging. 2. Background technology [0002] Active infrared imaging systems have been widely used in remote video surveillance, assisted driving, safety protection, scientific research, security criminal investigation, human-computer interaction and other fields. Video image is a very important part of the active infrared imaging system. Vision is the most important sensory organ of human beings. Visual information is one of the main sources for people to obtain information from the objective world, accounting for more than 70% of the information obtained by people's five sense organs. Therefore , it is very important to obtain high-quality infrared images. With the vigorous development of control technology and communication technology...

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Application Information

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IPC IPC(8): H04N9/04H04N5/33G03B15/05
Inventor 王健李斌初辰陈杰龙季晓勇
Owner NANJING UNIV
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