Patent ID: 11925328
Assignee: CILAG GMBH INTERNATIONAL
Field: Audio-visual technology (Electrical engineering)
Classification: CPC A  G  H | IPC A  G  H

Claim 19:
20. A system comprising:
an emitter comprising a plurality of sources of electromagnetic radiation, wherein each the plurality of sources is independently actuated according to a pulse cycle, and wherein the plurality of source comprises:
a visible source that pulses electromagnetic radiation within a visible waveband of the electromagnetic spectrum;
a first spectral source that pulses electromagnetic radiation only within a first narrow waveband that is 30 nm wide or less and within the visible waveband of the electromagnetic spectrum; and
a second spectral source that pulses electromagnetic radiation only within a second narrow waveband that is 100 nm wide or less and within a near infrared waveband of the electromagnetic spectrum;

an image sensor comprising a pixel array that outputs data for a plurality of exposure frames according to a sensor cycle, wherein the sensor cycle comprises:
a plurality of visible blanking periods wherein the pixel array accumulates electromagnetic radiation resulting from the emitter actuating only the visible source;
a plurality of visible readout periods wherein the image sensor reads out a visible exposure frame, wherein each of the plurality of visible readout periods occurs immediately subsequent to one of the plurality of visible blanking periods; and
a plurality of spectral blanking periods wherein the pixel array accumulates a spectral response emission resulting from the emitter actuating only one or more of the first spectral source or the second spectral source; and
a plurality of spectral readout periods wherein the image sensor reads out a spectral exposure frame, wherein each of the plurality of spectral readout periods occurs immediately subsequent to one of the plurality of spectral blanking periods; and

one or more processors configurable to execute instructions stored in non-transitory computer readable storage media, the instructions comprising applying edge enhancement to edges within the spectral exposure frame to separate true edges of the spectral response emission from random noise, wherein applying the edge enhancement comprises:
extracting luminance data from the spectral exposure frame;
detecting the edges of the spectral exposure frame based on the luminance data; and

applying a gain factor to the detected edges, wherein a magnitude of the gain factor is modified on one or more of a per-frame basis or a per-pixel basis.