Plenoptic imaging device with a virtual intermediate image
AssigneesEcole Polytechnique, Centre National De La Reche Scientifique, Ecole Nationale Superieure De Techniques Avances
InventorPhilippe Zeitoun
Life of this patent
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Abstract
A plenoptic imaging device for forming an image of the light field of an object, includes a sample holder suitable for holding the object; a main optical assembly, arranged to focus rays of the light field of the object, at a distance z0, referred to as the object distance, from the sample holder, which distance is smaller than an object focal distance f1 from the main optical assembly so as to form an intermediate optical image (Iv) of the object in an intermediate image plane at a distance z1 from the optical assembly; an assembly for sampling the light field, which assembly is suitable for acquiring spatiodirectional information on the rays forming the virtual image and for forming the image of the light field.
Claims9
A plenoptic imaging device for forming an image of the light field of an object (O), comprising:
- a sample holder (SH) configured to hold said object,
- a main optical assembly (LP), arranged to focus rays of the light field of said object, at a distance zo called the object distance from the sample holder less than an object focal distance f1 of said main optical assembly, so as to form an intermediate virtual image (Iv) of said object in an intermediate image plane at a distance z1 from said optical assembly,
- a light-field-sampling assembly (LFS) configured to acquire spatio-directional information of the rays forming the virtual image and to form said image of the light field, said light-field-sampling assembly comprising:
- a matrix-array photodetector (Det)
- a microlens array (ML) arranged at a distance a from the intermediate image plane, the photodetector being arranged at a distance b from the microlens array, each microlens being of diameter d2 and having a focal length f2 and being configured to form a micro-image (μl) of a respective portion of the virtual image of the object on a respective segment of the photodetector, each said segment comprising a plurality of pixels, the micro-images forming said image of the light field,
- wherein an image numerical aperture NAim,Lp of the main optical assembly is less than or equal to an image numerical aperture NAim,ML of each microlens.
Dependencies are inferred from the claim text.