Light Communication Data Embedding in Frequency Domain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light communication technologies face challenges in simultaneously performing image or video display and light communication due to undesirable color tones and human perceptible luminance variations when using RGB triplet LEDs for data transmission.
Innovation Solution
A data embedding technique is employed where communication processed data is embedded at specific frequency coefficients of the spatial domain of an original image using a modulation scheme, transforming it into multiple RGB values, allowing for simultaneous image/video display and light communication by embedding data in the eye-insensitive frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If communication data is transmitted using RGB triplet LEDs, then data transmission capability is improved, but color tone quality deteriorates
Solution Approach 1:
The patent transforms the communication data embedding from the spatial domain to the frequency domain by applying DCT transform. Data is embedded in frequency coefficients rather than directly in spatial pixel values, which allows the embedded data to be imperceptible to human eyes while maintaining color quality. This dimensional transformation resolves the contradiction between data transmission capability and color tone quality.
Solution Approach 2:
The patent modifies specific frequency domain parameters (DCT coefficients) to embed communication data. By changing only selected frequency coefficients rather than all pixel values, the system achieves data embedding while preserving the overall color characteristics and visual quality of the image.
2Productivity
If communication data is embedded in the spatial domain of an image, then data transmission rate is improved, but visual quality deteriorates due to noticeable distortion
Solution Approach 1:
The patent applies Discrete Cosine Transform (DCT) to convert spatial domain image data into frequency domain representation. Communication data is then embedded in the frequency coefficients rather than directly in spatial pixel values. This dimensional change allows data embedding without creating visually perceptible distortions, as the frequency domain modification is imperceptible to human vision.
Solution Approach 2:
The patent selectively modifies specific frequency domain parameters (DCT coefficients) to embed communication data. By targeting specific frequency components rather than uniformly modifying all spatial pixels, the system achieves efficient data transmission while maintaining visual quality that is imperceptible to human observers.
3Productivity
If multiple input data streams are transmitted using WDM with RGB triplet LEDs, then communication capacity is improved, but system complexity increases
Solution Approach 1:
The patent enables a single LED system to simultaneously perform multiple functions: displaying visual content and transmitting communication data. By embedding communication data within the display image in the frequency domain, the same hardware infrastructure serves dual purposes, increasing communication capacity without proportionally increasing system complexity.
Solution Approach 2:
The patent merges the display function and communication function into a unified system. The communication data is combined with the display image data in the frequency domain, allowing both functions to operate through the same LED hardware without requiring separate transmission channels or additional complex components.
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~3B
AI summary
In a light communication system, a data embedding unit arranged between a transmitter-side communication data processing unit and a light emitting device driver embeds a communication processed data at a spatial domain of an original image according to a modulation scheme, and gets multiple RGB values for a communication data embedded image. A receiving apparatus detects a transmitter-side communication data embedded image, generates a receiver-side communication data embedded image, compensate a deformation of the receiver-side communication data embedded image, outputs a warped communication data embedded image, and extracts a communication processed data from the warped communication data embedded image.