Back to results
US 11,386,281 B2Granted
Coordinated illumination and image signal capture for enhanced signal detection
AssigneeDigimarc Corporation
InventorsJacob L. Boles, Alastair M. Reed, John D. Lord
Life of this patent
Estimating the term…
Abstract
Signal detection and recognition employees coordinated illumination and capture of images under to facilitate extraction of a signal of interest. Pulsed illumination of different colors facilitates extraction of signals from color channels, as well as improved signal to noise ratio by combining signals of different color channels. The successive pulsing of different color illumination appears white to the user, yet facilitates signal detection, even for lower cost monochrome sensors, as in barcode scanning and other automatic identification equipment.
Claims25
A method for machine readable code detection in images comprising:
- illuminating an object with pulsed LED illumination, the pulsed LED illumination comprising illumination with plural different LED light sources;
- obtaining parts of image frames captured under illumination of the plural different LED light sources;
- and
- with plural processors, performing digital watermark detection on the parts of image frames, each part corresponding to an image signal captured under different illumination, wherein the digital watermark signal detection comprises detection of a synchronization pattern followed by extraction of data from a part of an image frame based on detection of the synchronization pattern.
1 more element
A method for machine readable code detection from an image comprising:
- obtaining parts of image frames captured under different wavelength illumination, wherein the different wavelength illumination comprises pulsing of different light sources, including pulsing an infrared light source and visible color light source;
- from the image signals, separating the parts of image frames for detection operations on plural processors, the parts of image frames corresponding to a channel of illumination corresponding to one of the different light sources, and
- with the plural processors, performing digital watermark detection on the parts of image frames, wherein the digital watermark signal detection comprises detection of a synchronization pattern followed by extraction of data from a part of an image frame based on detection of the synchronization pattern.
An imaging device comprising:
- an illumination source for providing pulsed LED illumination of different wavelength illumination, the pulsed LED illumination comprising illumination with plural different LED light sources;
- an image sensor for capturing image signals in coordination with the pulsed LED illumination;
- a controller for coordinating the pulsed LED illumination and corresponding image capture of parts of image frames under illumination of the plural different LED light sources;
- and
- plural processors in communication with the image sensor for obtaining image signals captured under different wavelength illumination, the plural processors are configured to obtain the parts of image frames and are configured to perform digital watermark detection on the parts of image frames, each part corresponding to an image signal captured under different wavelength illumination, wherein the digital watermark signal detection comprises detection of a synchronization pattern followed by extraction of data from a part of an image frame based on detection of the synchronization pattern.
2 more elements
An imaging device comprising:
- means for generating pulsed illumination of different wavelength illumination;
- an image sensor for capturing image signals in coordination with generated pulsed illumination;
- means for coordinating the generated pulsed illumination and corresponding image capture by said image sensor by capturing parts of image frames under illumination of the different wavelength illumination;
- and
- means for processing image signals captured under different wavelength illumination, said means for processing the image signals operable to obtain the parts of image frames;
- and
- means for detecting digital watermarking from the parts of image frames, each part of the parts of image frames corresponding to an image signal captured under different wavelength illumination, wherein said means for detecting digital watermarking is operable for synchronization of a part of an image frame and extraction of data from the part of an image frame based the synchronization.
4 more elements
Dependencies are inferred from the claim text.