Imaging device and imaging method

An imaging apparatus comprising:

• a light source configured to output coherent light;
• a spatial light modulator having a modulation plane to which output light from the light source is input, and configured to perform light phase modulation on input light in each of a plurality of pixel regions on the modulation plane based on a set light phase modulation pattern and output modulated light;
• a Fourier transform optical system configured to form a Fourier transform image of an object irradiated with output light from the spatial light modulator;
• a photodetector configured to selectively receive zero-order light in the Fourier transform image to detect a light intensity and output a light intensity value;
• and
• a control unit for configured to control setting of the light phase modulation pattern on the modulation plane of the spatial light modulator and acquire a phase image of the object based on the light phase modulation pattern and the light intensity value,
• wherein
• the control unit is configured to:
• set a first region and a second region on the modulation plane of the spatial light modulator,
• in a phase image acquisition of the first region, sequentially set a plurality of light phase modulation patterns in the first region, sequentially set a plurality of uniform phase shifts in a region other than the first region when setting each light phase modulation pattern in the first region to acquire the light intensity value, and acquire a phase image of a region of the object corresponding to the first region using a phase shift method, and
• in a phase image acquisition of the second region, sequentially set a plurality of light phase modulation patterns in the second region, sequentially set a plurality of uniform phase shifts in a region other than the second region when setting each light phase modulation pattern in the second region to acquire the light intensity value, and acquire a phase image of a region of the object corresponding to the second region using the phase shift method.

An imaging method for imaging an object using:

• a light source configured to output coherent light;
• a spatial light modulator having a modulation plane on which an image of the object irradiated with output light from the light source is formed, and configured to perform light phase modulation on input light in each of a plurality of pixel regions on the modulation plane based on a set light phase modulation pattern and output modulated light;
• a Fourier transform optical system configured to form a Fourier transform image of output light from the spatial light modulator;
• and
• a photodetector configured to selectively receiving receive zero-order light in the Fourier transform image to detect a light intensity and output a light intensity value,
• the method comprising:
• a region setting step of setting a first region and a second region on the modulation plane of the spatial light modulator;
• a first region phase image acquisition step of sequentially setting a plurality of light phase modulation patterns in the first region, sequentially setting a plurality of uniform phase shifts in a region other than the first region when setting each light phase modulation pattern in the first region to acquire the light intensity value, and acquiring a phase image of a region of the object corresponding to the first region using a phase shift method;
• and
• a second region phase image acquisition step of sequentially setting a plurality of light phase modulation patterns in the second region, sequentially setting a plurality of uniform phase shifts in a region other than the second region when setting each light phase modulation pattern in the second region to acquire the light intensity value, and acquiring a phase image of a region of the object corresponding to the second region using the phase shift method.

An imaging method for imaging an object using:

• a light source configured to output coherent light;
• a spatial light modulator having a modulation plane to which output light from the light source is input, and configured to perform light phase modulation on input light in each of a plurality of pixel regions on the modulation plane based on a set light phase modulation pattern and output modulated light;
• a Fourier transform optical system configured to form a Fourier transform image of the object irradiated with output light from the spatial light modulator;
• and
• a photodetector configured to selectively receive zero-order light in the Fourier transform image to detect a light intensity and output a light intensity value,
• the method comprising:
• a region setting step of setting a first region and a second region on the modulation plane of the spatial light modulator;
• a first region phase image acquisition step of sequentially setting a plurality of light phase modulation patterns in the first region, sequentially setting a plurality of uniform phase shifts in a region other than the first region when setting each light phase modulation pattern in the first region to acquire the light intensity value, and acquiring a phase image of a region of the object corresponding to the first region using a phase shift method;
• and
• a second region phase image acquisition step of sequentially setting a plurality of light phase modulation patterns in the second region, sequentially setting a plurality of uniform phase shifts in a region other than the second region when setting each light phase modulation pattern in the second region to acquire the light intensity value, and acquiring a phase image of a region of the object corresponding to the second region using the phase shift method.