Digital holography three-dimensional imaging apparatus and digital holography three-dimensional imaging method

An imaging apparatus comprising:

• an image sensor;
• an optical system configured to divide a light from a light source by a dividing element into an object beam and a reference beam and configured to cause, through a combining element, the object beam via an object and the reference beam from a reference beam path to interfere with each other to form interference fringes on the image sensor;
• and
• a processor,
• wherein the processer is configured to perform:
• multiple imaging processes to perform imaging of the interference fringes with different incident angles of the object beam to the object;
• a first process to acquire a transmitted wavefront for each of the incident angles, from each of the multiple interference fringes acquired by the multiple imaging processes;
• and
• a second process to calculate a three-dimensional refractive index distribution, from the transmitted wavefronts for the respective incident angles, and
• the apparatus further comprises an aberration modulator configured to be capable of changing aberration of the optical system,
• wherein the apparatus causes the aberration modulator to change the aberration in at least one of the multiple imaging processes and performs calculation for correcting the aberration in one of the first and second processes.

An imaging apparatus comprising:

• an image sensor;
• an optical system configured to divide a light from a light source by a dividing element into an object beam and a reference beam and configured to cause, through a combining element, the object beam via an object and the reference beam from a reference beam path to interfere with each other to form interference fringes on the image sensor;
• and
• a processor,
• wherein the processer is configured to perform:
• multiple imaging processes to perform imaging of the interference fringes with different incident angles of the object beam to the object;
• a first process to acquire a transmitted wavefront for each of the incident angles, from each of the multiple interference fringes acquired by the multiple imaging processes;
• and
• a second process to calculate a three-dimensional refractive index distribution, from the transmitted wavefronts for the respective incident angles, and
• wherein the apparatus performs calculation for correcting a known aberration of the optical system in one of the first and second processes.

An imaging method using an optical system configured to divide a light from a light source by a dividing element into an object beam and a reference beam and configured to cause, through a combining element, the object beam via an object and the reference beam from a reference beam path to interfere with each other to form interference fringes on an image sensor, the method comprising:

• performing multiple imaging processes to perform imaging of the interference fringes with different incident angles of the object beam to the object;
• performing a first process to acquire a transmitted wavefront for each of the incident angles, from each of the multiple interference fringes acquired by the multiple imaging processes;
• and
• performing a second process to calculate a three-dimensional refractive index distribution, from the transmitted wavefronts for the respective incident angles,
• wherein a phase distribution of light in any one of an optical path from the light source to the dividing element, the reference beam path and an optical path from the combining element to the image sensor is changed in at least one of the multiple imaging processes.

An imaging method using an optical system configured to divide a light from a light source by a dividing element into an object beam and a reference beam and configured to cause, through a combining element, the object beam via an object and the reference beam from a reference beam path to interfere with each other to form interference fringes on an image sensor, the method comprising:

• performing multiple imaging processes to perform imaging of the interference fringes with different incident angles of the object beam to the object;
• performing a first process to acquire a transmitted wavefront for each of the incident angles, from each of the multiple interference fringes acquired by the multiple imaging processes;
• and
• performing a second process to calculate a three-dimensional refractive index distribution, from the transmitted wavefronts for the respective incident angles,
• wherein aberration of the optical system is changed in at least one of the multiple imaging processes, and
• calculation for correcting the aberration is performed in one of the first and second processes.

An imaging method using an optical system configured to divide a light from a light source by a dividing element into an object beam and a reference beam and configured to cause, through a combining element, the object beam via an object and the reference beam from a reference beam path to interfere with each other to form interference fringes on an image sensor, the method comprising:

• performing multiple imaging processes to perform imaging of the interference fringes with different incident angles of the object beam to the object;
• performing a first process to acquire a transmitted wavefront for each of the incident angles, from each of the multiple interference fringes acquired by the multiple imaging processes;
• and
• performing a second process to calculate a three-dimensional refractive index distribution, from the transmitted wavefronts for the respective incident angles,
• wherein calculation for correcting a known aberration of the optical system is performed in one of the first and second processes.