Single-sensor hyperspectral imaging device
The present disclosure generally relates to hyperspectral spectroscopy, and in particular, to systems, methods and devices enabling a single-sensor hyperspectral imaging device. Hyperspectral (also known as “multispectral”) spectroscopy is an imaging technique that integrates multiples images of an object resolved at different narrow spectral bands (i.e., narrow ranges of wavelengths) into a single data structure, referred to as a three-dimensional hyperspectral data cube. Data provided by hyperspectral spectroscopy allow for the identification of individual components of a complex composition through the recognition of spectral signatures of individual components within the three-dimensional hyperspectral data cube.
1. A hyperspectral imaging device comprising:
a photo-sensor array including a plurality of photo-sensors, each photo-sensor in the plurality of photo-sensors providing a respective output;
a spectral filter array having a plurality of filter elements, wherein each filter in the plurality of filter elements is arranged to filter light received by a respective one or more of the plurality of photo-sensors, and wherein each filter element is one of a plurality of filter-types, wherein each filter-type is characterized by a single spectral pass-band that is different from the other filter-types;
an interface module to select one or more sub-sets of photo-sensor outputs, wherein each sub-set of photo-sensor outputs is associated with a single respective filter-type; and
a control module configured to generate, from the one or more sub-sets of photo-sensor outputs, a plurality of respective images for use in a hyperspectral data cube, wherein each respective image is produced from a single respective sub-set of photo-sensor outputs so that each of the plurality of respective images is associated with a particular filter-type.
2. The hyperspectral imaging device of claim 1 , wherein the controller is further configured to capture single frame image data by controlling the exposure of the combination of the photo-sensor array and spectral filter array to light, and wherein the hyperspectral data cube is generated from the single frame image data.
3. The hyperspectral image device of claim 2 , wherein each of the plurality of images is generated by applying an interpolation process to the respective sub-set of photo-sensor outputs for the one respective filter-type.
4. The hyperspectral imaging device of claim 1 , wherein the center-to-center distance between two filter elements of the same type is less than 250 microns.
5. The hyperspectral imaging device of claim 1 , wherein the center-to-center distance between two filter elements of the same type is less than 150 microns.
6. The hyperspectral imaging device of claim 1 , wherein the filter elements of at least one particular filter-type are spatially distributed across throughout the spectral filter array.
7. The hyperspectral imaging device of claim 6 , wherein the spatial distribution of the filter elements of the at least one particular filter-type is characterized by a substantially uniform distribution of the filter elements throughout the spectral filter array.
8. The hyperspectral imaging device of claim 1 , wherein a spatial distribution of the filter elements is characterized by a repeating pattern of one or more filter-types.
9. The hyperspectral imaging device of claim 1 , wherein the plurality of filter-types includes at least three filter-types.
10. The hyperspectral imaging device of claim 1 , wherein the interface module comprises circuitry configured to select the one or more sub-sets of photo-sensor outputs.
11. The hyperspectral imaging device of claim 1 , wherein the interface module comprises:
one or more registers configured to receive the output of the photo-sensor array; and
wherein the controller is further configured to:
identify which registers correspond to filter elements of a particular filter-type from a look-up table; and
select one or more sub-sets of photo-sensor outputs from the one or more registers based on the identification of the registers that correspond to filter elements of the particular filter-type.
12. The hyperspectral imaging device of claim 11 , wherein the controller is also operable to bundle photo-sensor outputs from the particular filter-type into data packets, wherein the data packets include at least the corresponding register values.
13. The hyperspectral imaging device of claim 12 , further comprising a transceiver to transmit the data packets to a server, and receive an image for each filter-type from the server based on the transmitted data packets.
14. The hyperspectral imaging device of claim 1 comprising a hand-held medical imaging device.
15. The hyperspectral imaging device of claim 1 further comprises a display control module and a display.
16. The hyperspectral imaging device of claim 15 , wherein the display receives an image in the plurality of respective images or the hyperspectral data cube from the display control module for display.
17. The hyperspectral imaging device of claim 16 , wherein each respective image of the plurality of respective images is of the same region of interest of a subject and the display further displays a probability that the region has a particular medical condition, a category of condition, a probable age of the condition, a boundary of the condition, or information about treatment of a condition.
18. The hyperspectral imaging device of claim 15 wherein the display is a touchscreen display that is used to manipulate a displayed image or to control the hyperspectral imaging device.
19. The hyperspectral imaging device of claim 1 further comprising a communication interface for communicating the plurality of respective images to a remote device across a communication network.
20. The hyperspectral imaging device of claim 19 wherein the communication interface uses a communication protocol selected from the group consisting of cellular, WiFi, ZigBee, BlueTooth, IEEE 802.11b, 802.11a, 802.11g, and 802.11n to communicate the plurality of images.