Over the last 25 years, we have been involved in 3D image processing research field. We started our researches related to 3D image processing with “Data Compression of an Autostereoscopic 3-D Image” and presented our work in SPIE SD&A session in 1994. We first proposed the ray space representation of 3D images which is a common data format for various 3D capturing and displaying devices. Based on the ray space representation, we have conducted various researches on 3D image processing, which include: ray space coding and data compression, view interpolation, ray space acquisition, display, and a full system from capture to display of ray space. In this paper, we introduce some of our 25-year researches in terms of 3D image processing – from capture to display –.