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US 7,583,863 B2Granted
Method and system for wavelength-dependent imaging and detection using a hybrid filter
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsJulie E. Fouquet, Richard E. Haven, Scott W. Corzine
Life of this patent
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Abstract
An object to be imaged or detected is illuminated by a single broadband light source or multiple light sources emitting light at different wavelengths. The light is detected by a detector, which includes a light-detecting sensor covered by a hybrid filter.
Claims21
A receiving module, comprising:
- a patterned filter layer comprising regions of filter material that transmit a portion of light received at the patterned filter layer and filter-free regions that transmit all of the light received at the patterned filter layer, the regions of the filter material and the filter-free regions being regions arranged in rows and columns such that at least one of the filter-free regions is positioned between the regions of the filter material in each row and in each column;
- a light-detecting sensor positioned to receive the light transmitted through the patterned filter layer, the light-detecting sensor including an arrangement of pixels, some of the pixels of the light-detecting sensor being positioned to receive the light transmitted through the regions of filter material of the patterned filter layer, some of the pixels of the light-detecting sensor being positioned to receive the light transmitted through the filter-free regions of the patterned filter layer and
- a controller configured to determine at least one gain factor for images detected by the light-detecting sensor using a pixel-based contrast defined as
- Cp=|(feature signal in frame N-feature signal in frame M)/|(scene signal in frame N-scene signal in frame M)
- Where Cp is the pixel-based contrast and N and M are integer numbers, wherein the scene signal represent a background scene of the images and the feature signal represents at least one feature of interest in the images.
2 more elements
An imaging system comprising:
- a first receiving module comprising a first light-detecting sensor and a first hybrid filter, the first hybrid filter including a narrowband filter layer and a patterned filter layer, the patterned filter layer comprising regions of filter material that transmit a portion of light received at the patterned filter layer and filter-free regions that transmit all of the light received at the patterned filter layer, the regions of the filter material and the filter-free regions being regions arranged in rows and columns such that at least one of the filter-free regions is positioned between the regions of the filter material in each row and in each column, the first light-detecting sensor being positioned to receive the light transmitted through the patterned filter layer, the light-detecting sensor including an arrangement of pixels, some of the pixels of the light-detecting sensor being positioned to receive the light transmitted through the regions of filter material of the patterned filter layer, some of the pixels of the light-detecting sensor being positioned to receive the light transmitted through the filter-free regions of the patterned filter layer;
- and
- a first controller connected to the receiving module, the first controller being configured to determine at least one gain factor for images detected by the first light-detecting sensor using a pixel-based contrast defined as
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- where Cp is the pixel-based contrast and N and M are integer numbers, wherein the scene signal represent a background scene of the images and the feature signal represents at least one feature of interest in the images.
63 more elements
A method for wavelength-dependent detection, comprising:
- receiving light from an object at a detector of an imaging system, wherein the light includes light propagating at two or more wavelengths of interest;
- discriminating between light received at or near the two or more wavelengths of interest while simultaneously blocking light received at all other wavelength by the detector;
- detecting the amount of light received at or near the two or more wavelengths of interest;
- generating a plurality of images using the detected amount of light received at or near the two or more wavelengths of interest by the detector so that an image is generated for each of the two or more wavelengths of interest;
- and
- applying at least one gain factor to the images associated with a portion of the wavelengths of interest by a processor of the image system,
- wherein the at least one gain factor is determined by the processor using a pixel-based contrast defined as
- Cp=|(feature signal in frame N-feature signal in frame M)/|(scene signal in frame N-scene signal in frame M)
- Where Cp is the pixel-based contrast and N and M are integer numbers, wherein the scene signal represent a background scene of the images and the feature signal represents at least one feature of interest in the images.
6 more elements
Dependencies are inferred from the claim text.