Colour displays and lookup tables : real time modifications of digital images

Article Article scientifique Article Colour displays and lookup tables : real time modifications of digital images eng 1991 author Lutz René William 35530 author Pun Thierry 22776 author Pellegrini Christian 24713 73-84 10.1016/0895-6111(91)90029-U 0895-6111 http://www.sciencedirect.com/science/article/pii/089561119190029U Image processing in biomedical research has become customary, along with use of colour displays to run image processing packages. The performance of softwares is highly dependent on the device they run on: architecture of colour display, depth of frame buffer, existence of look-up table, etc. Knowledge of such basic features is therefore becoming very important, especially because results can differ from device to device. This introductory paper discusses hardware features and software applications. A general architecture of colour displays is exposed, comparing the features of the most commonly used devices. Basic organisation of memory, electron gun and screen are analysed for each type of display, concluding with a more detailed study of raster scan devices. Frame buffer and look-up table organisation are then analysed in relation with overhead expenses such as time and memory. Relation between image data and displayed images is discussed. By means of examples, the manipulation of colour tables is examined in detail, showing how to improve display of images without altering image data. Finally, the basic operations performed by the look-up table editor developed at University of Geneva are presented. Look-up table Colour map Frame buffer Grey scale Pixel Histogram Pseudo colour Dewey 025.063 13 Centre universitaire d'informatique 0D3 32 Département d'informatique 18 false 895 Computer Vision and Multimedia Laboratory 730 Geneva Artificial Intelligence Laboratory 725 Multimodal Interaction Group Computerized medical imaging and graphics 15 2 f76c5ee8-0fac-4ec5-a8a5-0cc5d68c0b51 Article (Published version) Public 1991Lutz_colour_displays.pdf 1078262 application/pdf openAccess Centres et instituts / Centre universitaire d'informatique Faculté des sciences / Département d'informatique

Title	Published in	Year	Views	Downloads

Colour displays and lookup tables : real time modifications of digital images	Computerized medical imaging and graphics	1991	615	547
Segmentation de régions par une méthode récursive		1990	420	0

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Lutz, René William