The Research Of The Refocus' Performance Based On The Lytro Camera

With the development of the light field imaging technology,light field constantly use in various field,more and more applications appear in our field of vision in the form of three-dimensional images progressively,then we can perceive the diversity of the real world better.It's more convenient for consumers to use and it has solved many problem for the photographer,when the advent of the Lytro camera in 2012.This paper carries on the thorough research aim at the performance of refocus bases on light filed cameras,the main contents include: codes,calibrates and color correction to the original image,completes refocus of light field image accords to light filed of imaging technology,gets all-focus images by image sequence fusion,use stereo matching method of split to analysis the parallax figure,the specific process of this paper is as follows:First,this paper's research equipment is Lytro camera,considering that Lytro camera as a closed box,this paper analysis the performance of light filed camera from working principle,file structure and algorithm analysis,completed the coding,calibration,color correction and contents of the digital transformation.Then,this paper study the imaging principle of light field camera and double planar parametric of light filed,on this basis,analysis the energy function of light filed,deduces the imaging expressions that imaging system of light field,and according to the propagation path of light filed inside the camera,distribution map of light path and lens' refraction principle,simulates the optical imaging system and complete the refocus.Finally,carries on further research of light filed image based on the refocus technology,first of all constructs image sequence,get the refocus image of sub-image,then use the sharpness evaluation operator to ensure the highest focal point of sub image,in the end completes the full focus image after image fusion.In this paper,shows some study of parallax figure of light image,as subsequent depth measurement and 3D reconstruction laid a solidfoundation.