Optical system and method for active image acquisition

An optical method for active image acquisition, adapted to capture light field information about an object for creating an object model, and employing an active image acquisition optical system comprising a processing unit, a light-emitting unit, and a capturing unit, the active image acquisition method comprising the steps of:

• generating a plurality of modulating signals and a plurality of synchronous signals in sequence by the processing unit;
• sending the modulating signals to the light-emitting unit and the synchronous signals to the capturing unit;
• modulating a first light beam generated from the light-emitting unit according to each of the modulating signals, and changing at least one of an intensity of the first light beam, a wavelength of the first light beam, a spectral distribution of the first light beam, and a pattern projected by the first light beam according to the modulating signals;
• allowing the first light beams to fall on the object under test and a second light beam to be reflected off the object under test as a result of each of the first light beams incident on the object under test, wherein the second light beam carries light field information pertaining to the object under test;
• driving the capturing unit by the synchronous signals to enable the capturing unit to capture the second light beam for forming images while the modulating signals are each modulating the first light beam;
• executing a first algorithm by the processing unit to compute the images and the modulating signals so as to generate an algorithmic result;
• and
• creating the object model by the processing unit according to the algorithmic result.