Method and apparatus for correcting color imbalance of visible light in wavelength division parallel visible light communications

An apparatus for correcting a color imbalance of visible light in wavelength division parallel visible light communications (VLCs), the apparatus comprising:

• a VLC transmitter for transmitting a visible light signal including information to a VLC receiver during a preset correction period, for setting correction bits corresponding to a basis for correcting a color imbalance by each of the wavelengths, for generating a first adjustment light necessary to correct the color imbalance between the wavelengths during a preset color adjustment period, and for generating a second adjustment light necessary to correct a color imbalance between a previous correction period and a current correction period;
• and
• a VLC receiver for receiving a visible light signal including information from the visible light transmitter during the preset correction period, and for ignoring a visible light signal received during a preset color adjustment period.

An apparatus for correcting a color imbalance of visible light in wavelength division parallel visible light communications (VLCs), the apparatus comprising:

• a VLC transmitter for transmitting a stop_receiving flag through a path of a specific wavelength if a number of on-bits of a specific wavelength is equal to or fewer than a preset threshold while counting the number of on-bits transmitted by each wavelength during a preset correction period, for comparing the number of on-bits of the specific wavelength with a preset threshold and for generating adjustment light in accordance with a number calculated by subtracting the number of on-bits from the preset threshold through a path of the specific wavelength, and for transmitting a start_receiving flag through the path of the specific wavelength after the generation of the adjustment light;
• and
• a VLC receiver for receiving a visible light signal including information from the VLC transmitter to a VLC receiver during a preset correction period, and for ignoring signals received between the stop_receiving flag and the start_receiving flag.