White balance by tunable spectral responsivities

Area of Science:

• Digital imaging and sensor technology
• Optoelectronics and photonics
• Color science

Background:

• Modern digital imaging often uses silicon's wavelength-dependent absorption instead of physical color filters.
• Some devices allow electrical tuning of color channel responsivity via voltage changes.

Purpose of the Study:

• To present a new white balance method for digital imaging devices.
• To compensate for illuminant spectrum variations by adjusting detector spectral responsivities.
• To maintain the chromatic components of a white object independent of the illuminant.

Main Methods:

• Exploiting electrically tunable spectral responsivities in color detectors.
• Implementing a white balance method by selecting different sets of responsivities based on the illuminant spectrum.
• Utilizing a transverse field detector with tunable spectral responsivities.

Main Results:

• The proposed method effectively compensates for changes in illuminant spectrum.
• Experimental data demonstrate effectiveness with three distinct spectral sources.
• Color error in a perceptual color space remained stable within the tuning interval after correction.

Conclusions:

• The developed white balance method is effective for digital imaging sensors with tunable spectral responsivities.
• This technique ensures consistent color reproduction across different lighting conditions.
• The method offers a significant advancement in maintaining accurate color fidelity in digital images.