Method and system for object reconstruction
A system and method are presented for use in the object reconstruction. The system comprises an illuminating unit, and an imaging unit (see FIG. 1 ). The illuminating unit comprises a coherent light source and a generator of a random speckle pattern accommodated in the optical path of illuminating light propagating from the light source towards an object, thereby projecting onto the object a coherent random speckle pattern. The imaging unit is configured for detecting a light response of an illuminated region and generating image data. The image data is indicative of the object with the projected speckles pattern and thus indicative of a shift of the pattern in the image of the object relative to a reference image of said pattern. This enables real-time reconstruction of a three-dimensional map of the object.
1. A system for object reconstruction, comprising:
an illuminating unit, comprising a coherent light source and a generator of a non-periodic pattern comprising a diffractive optical element (DOE) in an optical path of illuminating light propagating from the light source toward an object, thereby projecting the non-periodic pattern onto an object;
an imaging unit configured to detect a light response of an illuminated region and generating image data indicative of the object within the projected pattern; and
a processor, configured to reconstruct a three-dimensional (3D) map of the object responsively to a shift of the pattern in the image data relative to a reference image of the pattern.
2. The system according to claim 1 , wherein the reference image is acquired at a reference plane oriented normally to the optical path of the illuminating light.
3. The system according to claim 2 , wherein the reference plane is at the same distance from the generator of the non-periodic pattern and from the imaging unit.
4. The system according to claim 1 , wherein the processor is configured to reconstruct the 3D map by determining a correlation between the image data and the reference image.
5. The system according to claim 1 , wherein the DOE is configured to adjust a brightness variation of the projected pattern between different regions in a field of view of the imaging unit.
6. The system according to claim 1 , wherein the projected pattern comprises a Fourier transform of the DOE.
7. The system according to claim 1 , wherein the imaging unit comprises a single light detector having a stationary field of view.
8. A method for object reconstruction, comprising:
projecting onto an object a non-periodic pattern formed by a coherent light source and a generator of the non-periodic pattern comprising a diffractive optical element (DOE) in an optical path of illuminating light propagating from the light source toward the object;
detecting a light response of an illuminated region and generating image data indicative of the object within the projected pattern; and
processing the image data so as to reconstruct a three-dimensional (3D) map of the object responsively to a shift of the pattern in the image data relative to a reference image of the pattern.
9. The method according to claim 8 , wherein the reference image is acquired at a reference plane oriented normally to the optical path of the illuminating light.
10. The method according to claim 9 , wherein the reference plane is at the same distance from the generator of the non-periodic pattern and from an imaging unit that detects the light response.
11. The method according to claim 8 , wherein processing the image data comprises reconstructing the 3D map by determining a correlation between the image data and the reference image.
12. The method according to claim 8 , wherein the DOE is configured to adjust a brightness variation of the projected pattern between different regions in a field of view of the imaging unit.
13. The method according to claim 8 , wherein the projected pattern comprises a Fourier transform of the DOE.
14. The method according to claim 8 , wherein detecting the light response comprises capturing an image using a single light detector having a stationary field of view.