Patent ID: 11937000
Assignee: PHOTONEO S.R.O.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method comprising, for each particular imaging pixel in a set of imaging pixels in a camera:
(a) generating electrical charge in a photodiode of the particular pixel in response to light has passed through a first optical filter and is incident on the photodiode;
(b) depleting, at a rate of depletion, a first portion of the electric charge, in such a way that the rate of depletion depends on irradiance of light that has passed through a second optical filter and is incident on a photoresistor of the particular pixel; and
(c) reading out a remaining portion of the electrical charge, which remaining portion remains after the first portion is depleted;, wherein
(1) the depleting is from a floating diffusion that stores charge generated by the photodiode,
(2) the photoresistor has a light-dependent resistance that controls amperage of an electrical current that flows from the floating diffusion through the photoresistor during the depleting,
(3) light incident on the particular pixel comprises active light and ambient light,
(4) irradiance of ambient light that has passed through the first optical filter and is incident on the photodiode differs by less than 25% from irradiance of ambient light that has passed through the second optical filter and is incident on the photoresistor,
(5) irradiance of active light that has passed through the second optical filter and is incident on the photoresistor is less than 25% of irradiance of active light that has passed through the first optical filter and is incident on the photodiode, and
(6) the depleting reduces or eliminates an effect that the ambient light would otherwise have on a measurement taken by the particular pixel.