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No-lens imager based visible light communication method

A visible light communication and imager technology, applied in the field of optical communication technology and image processing, can solve the problems of increasing the overall thickness of mobile devices and affecting the overall appearance, etc.

Active Publication Date: 2018-07-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The fly in the ointment is that the optical system of the camera with the lens in the mobile device greatly increases the overall thickness of the mobile device and affects the overall appearance
If the optics were removed, it would be possible to create very interesting ultra-thin video cameras

Method used

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  • No-lens imager based visible light communication method
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  • No-lens imager based visible light communication method

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Embodiment Construction

[0059] The present invention mainly uses a lensless imager at the receiving end to receive and demodulate data, and provides a method for identifying the data signal carried by the captured image at the receiving end, thereby making full use of the advantages of the extensive promotion of the lensless imager in the application of smart devices To promote the development of communication technology.

[0060] What the present invention uses at the beginning is the LED lamp, because of its advantages such as fast response speed, high-speed modulation, thus be widely used. In addition, using the flash of a portable electronic device with a camera function is also a feasible option, especially in the case of very popular mobile phones that are generally equipped with a flash instead of a light. Of course, some flash types are themselves LED lights.

[0061] In the embodiment of the present invention, the lensless imager is suitable for receiving the visible light emitted by the ab...

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Abstract

The invention relates to a no-lens imager based visible light communication method. According to the method, data processing complexity at a receiving terminal is reduced as a training sequence is added to each transmitted frame of data in a communication process, and image frames corresponding to the captured training sequences are then subjected to compression processing. Then, a convolutional neural network is trained periodically and continuously by using feature vectors of image frames corresponding to the compressed training sequences, weights are optimized continuously by utilizing counter-propagation and a gradient descent algorithm to minimize mutual entropy loss, improve environment adaptability of the convolutional neural network and finally increase a classification effect of the convolutional neural network for the image frames continuously. Finally, the image frames corresponding to the subsequently captured data bits are classified by using the trained convolutional neural network, then the data bits are decoded by using the classified image frames, and finally the decoded data are enabled to be more accurate.

Description

technical field [0001] The invention belongs to the field of optical communication technology and image processing technology, and relates to a visible light communication method based on a lensless imager. Background technique [0002] Spectrum-based wireless communication, the main driver of VLC technology development, has the potential to address directional transmission challenges in several application domains, from home and factory robotics to vehicular networking. Directional transmission with narrow beamwidth and line of sight (LOS) limitation can reduce co-channel interference through spatial reuse improvement, narrow transmission beam has advantages in transmission power and signal to noise ratio (SNR) . And the limitations of transmission power and directional transmission within the communication range have also been progressed. Another dynamic involves the light-emitting diode (LED) revolution, which, in addition to exhibiting the advantages of long life and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/67H04B10/516G06N3/04
CPCH04B10/116H04B10/516H04B10/67G06N3/045
Inventor 祝宇鸿钟苏华迟学芬莫秀玲李志军王爽
Owner JILIN UNIV