Visible Light Data Communication 2D Color Code Detection

The patent applies preliminary action by pre-defining multiple candidate reference cells with known chromaticity coordinates before data transmission. The receiving end calculates correlation coefficients between received signals and these pre-stored candidate references, enabling accurate identification even under interference. This preliminary preparation of reference data allows the system to maintain measurement precision while achieving high transmission rates through efficient correlation-based detection.

The patent segments the 2D color code structure into distinct functional regions: reference cells containing known chromaticity patterns and data cells containing transmitted information. By segmenting the detection process into correlation-based reference matching followed by data extraction, the system maintains high information capacity while improving reliability. The reference region acts as a separate verification layer that enables accurate detection even when data regions are confused or degraded.

The patent applies local quality by making the reference cell arrangement rotation-invariant. Instead of requiring fixed positional arrangements, the system uses correlation coefficients to match chromaticity patterns regardless of rotation angle. The reference cells are strategically positioned at locations that maintain their relative chromaticity relationships even when rotated, allowing the detector to identify the code structure and orientation automatically through pattern matching rather than position-dependent detection.