| 摘要 |
A new design of digitally generated graphic is presented which is intended to help maintain the frame of reference when viewing digitally processed images. The intention is that the Digital Frame of Reference (DFOR) be included with all digitally processed images and processed using the same factors as were used on the image. An unprocessed DFOR can then be displayed adjacent to the processed DFOR in order to reintroduce a frame of reference and clearly illustrate 'what has happened to the image'. This would allow the viewer to perceive any artefacts that may have been introduced into the image by the processing. This is particularly important where the image requires interpretation by the viewer as in, for example, forensics and medical diagnosis. This paper presents a grey scale version of the DFOR that is suitable for applications such as medical imaging. The DFOR includes grey scale from 0 to the max bit depth in 0,30,70 90% steps on a 50% background, the full frequency range from 0 to the Nyquist frequency, high, medium and low contrast boundaries and linear/curvilinear features. The same method could be extended to any other digital image system and could be easily modified to include colour. |
