Object-oriented coding for efficient transmission of space-acquired image data

✍ Scribed by J.R. Brückner; W. Lu; M.P. Gough

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 743 KB
• Volume: 9
• Category: Article
• ISSN: 0923-5965
• DOI: 10.1016/s0923-5965(96)00017-3

✦ Synopsis

Object-oriented coding is introduced and compared with cosine transform coding for the transmission of spaceacquired image data. The new coding scheme improves the compression ratio by incorporating knowledge about the image contents and its source. Utilising a priori knowledge enables on-board spacecraft data analysis to only select useful information for transmission.

Initially, the cosine transform compression technique is reviewed and its merits illustrated. It is shown in a qualitative way by image examples that this form of compression is very limited. Next, an image analysis and coding method that utilises a priori information is introduced. This technique segments objects from the background, detects the segmented objects and evaluates a set of feature vectors for all objects. The vector set can then be transmitted as an object-oriented image representation with a comparatively high compression ratio. 0 1997 Elsevier Science B.V.