# US 2014/0192255 A1 · Dynamic Adjustment of Multimode Lightfield Imaging System Using Exposure Condition and Filter Position > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192255 A1 - Document ID: US20140192255A1 - Status: Published application - Kind: A1 - Application number: 13/735,297 - Filed: 2013-01-07 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: Ricoh Company, Ltd. - Inventors: Sapna A. Shroff; Kathrin Berkner - Web page: https://patentgrep.com/patent/US20140192255A1 ## CPC - H04N 23/73: by influencing the exposure time - G01J 3/0208: {using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction} - G01J 3/2803: {using photoelectric array detector} - G01J 3/32: Investigating bands of a spectrum in sequence by a single detector - G01J 3/36: Investigating two or more bands of a spectrum by separate detectors - G01N 21/27: using photo-electric detection (G01N21/31 takes precedence){; circuits for computing concentration (logarithmic circuits G06G7/24; photometric circuits in general G01J)} - G02B 27/0075: {with means for altering, e.g. increasing, the depth of field or depth of focus} - H04N 23/10: for generating image signals from different wavelengths - H04N 23/957: Light-field or plenoptic cameras or camera modules - G01J 2003/1213: {Filters in general, e.g. dichroic, band} - G01J 2003/1221: {Mounting; Adjustment} - G01J 2003/1243: {Pivoting IF or other position variation} - G01N 2021/1797: {in landscape, e.g. crops} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An adjustable multimode lightfield imaging system. A non-homogeneous filter module is positioned at the pupil plane of the lightfield imaging system and provides the multimode capability. The filter module can be moved relative to the imaging system with the exposure conditions adjusted accordingly, thus allowing adjustment of the multimode capability. ## Claims ### Claim 1 An adjustable multimode lightfield imaging system comprising: an optical module that forms an optical image of an object, the optical module characterized by imaging optics, a pupil plane and an image plane; a filter array positioned approximately at the pupil plane, the filter array moveable relative to the optical module; an array of micro-imaging elements positioned approximately at the image plane; a detector array positioned such that the micro-imaging elements image the filter array onto the detector array, the detector array capturing a multimode image of the object according to an exposure condition; and a controller that adjusts the exposure condition in response to a position of the filter array. ### Claim 2 (depends on 1) The lightfield imaging system of claim 1 wherein the filter array is moveable along a direction that lies in the pupil plane. ### Claim 3 (depends on 2) The lightfield imaging system of claim 2 wherein the controller adjusts the exposure condition in response to positions of the filter array where, at different positions of the filter array, the same filters in the filter array occupy the pupil but the filters occupy different fractions of the pupil. ### Claim 4 (depends on 1) The lightfield imaging system of claim 1 wherein the controller adjusts a strength of a source illuminating the object. ### Claim 5 (depends on 1) The lightfield imaging system of claim 1 wherein the controller adjusts light throughput of the optical module. ### Claim 6 (depends on 1) The lightfield imaging system of claim 1 wherein the controller adjusts attenuation of a neutral density filter. ### Claim 7 (depends on 1) The lightfield imaging system of claim 1 wherein the controller adjusts exposure/integration time of the detector array. ### Claim 8 (depends on 1) The lightfield imaging system of claim 1 wherein the controller adjusts the exposure condition in response to an image quality metric of the multimode image. ### Claim 9 (depends on 8) The lightfield imaging system of claim 8 wherein the image quality metric is a signal to noise ratio. ### Claim 10 (depends on 8) The lightfield imaging system of claim 8 wherein the image quality metric is a signal energy. ### Claim 11 (depends on 8) The lightfield imaging system of claim 8 wherein the image quality metric is an exposure value. ### Claim 12 (depends on 1) The lightfield imaging system of claim 1 wherein the controller accesses a lookup table to determine the adjustment to the exposure condition. ### Claim 13 (depends on 1) The lightfield imaging system of claim 1 wherein the filter array includes filters with different wavelength responses. ### Claim 14 (depends on 1) The lightfield imaging system of claim 1 wherein the filter array implements multispectral imaging. ### Claim 15 (depends on 1) The lightfield imaging system of claim 1 wherein the array of micro-imaging elements includes a microlens array. ### Claim 16 (depends on 1) The lightfield imaging system of claim 1 wherein the optical module is telecentric. ### Claim 17 (depends on 1) The lightfield imaging system of claim 1 wherein the pupil plane has a magnification of at least 10:1 relative to the detector array. ### Claim 18 A method for adjusting a plenoptic imaging system having a filter array positioned at a pupil plane of the plenoptic imaging system, the method comprising: in response to a motion of the filter array relative to the plenoptic imaging system, adjusting an exposure condition for the plenoptic imaging system; and capturing, under the exposure condition, a multimode image of an object, the multimode image based on a position of the filter array. ### Claim 19 (depends on 18) The method of claim 18 wherein, under the motion of the filter array, the same filters in the filter array occupy the pupil but the filters occupy different fractions of the pupil. ### Claim 20 (depends on 18) The method of claim 18 wherein the step of adjusting the exposure conditions comprises adjusting a strength of a source illuminating the object.