1. A method of generating an object image by optical coherence tomography with natural color representation, the method comprising the steps of: performing optical coherence tomography imaging on the object illuminated with a red LED resulting in a first image; performing optical coherence tomography imaging on the object illuminated with a blue LED resulting in a second image; performing optical coherence tomography imaging on the object illuminated with a green LED resulting in a third image; and combining the first, second and third images to generate a fourth image having full natural color representation.