Electronic HDR Image Processing: Analog and Digital
John J. McCann, Alessandro Rizzi · 2011
Electronic High-Dynamic-Range (HDR) image capture and display began in the 1960s. At first, it used cumbersome analog processing, but quickly moved to digital image processing. The earliest ideas applied the same principles found in human spatial vision to picture making. This chapter reviews research on spatial vision at that time. This paper suggested that lightness correlated with spatial ratios and expanded it beyond the restraints of uniform illumination. Electronic image processing, fi rst with analog, then with digital image processing and digital photography addressed the rendition of HDR scenes. Early systems set out to mimic human vision ' s example of capturing HDR information and rendering it in LDR media. These systems use HDR spatial information from the entire scene to calculate appearances and write them on prints and displays. Controlled Vocabulary Terms analog processing circuits; digital images; digital photography; image processing; lighting