Shape coding
Encyclopedia
Shape coding is a method of design
of a control that allows the control's function to be signified by the shape of the control. It was used successfully by Alphonse Chapanis
on airplane controls to improve aviation safety.
MPEG-4
The shape information is referred to as alpha planes. The techniques to be adopted by the standard will provide lossless coding of alpha planes and lossy coding of shapes and transparency information since the shape size scalable, thus allowing a tradeoffs between bit rate and accuracy of shape representation. Furthermore, intra and inter shape prediction is envisioned so as to allow both efficient random access operations as well as efficient compression of shape and transparency information.
Alpha planes
Binary (each pixel is either 0 or 255). Grey scale (each pixel is 8 bit).
Design
Design as a noun informally refers to a plan or convention for the construction of an object or a system while “to design” refers to making this plan...
of a control that allows the control's function to be signified by the shape of the control. It was used successfully by Alphonse Chapanis
Alphonse Chapanis
Alphonse Chapanis was a pioneer in the field of industrial design, and is widely considered one of the fathers of ergonomics or human factors - the science of ensuring that design takes account of human characteristics...
on airplane controls to improve aviation safety.
External links
MPEG-4MPEG-4MPEG-4 is a method of defining compression of audio and visual digital data. It was introduced in late 1998 and designated a standard for a group of audio and video coding formats and related technology agreed upon by the ISO/IEC Moving Picture Experts Group under the formal standard ISO/IEC...
Video Object Plane Decoder and the functionality
The shape information is referred to as alpha planes. The techniques to be adopted by the standard will provide lossless coding of alpha planes and lossy coding of shapes and transparency information since the shape size scalable, thus allowing a tradeoffs between bit rate and accuracy of shape representation. Furthermore, intra and inter shape prediction is envisioned so as to allow both efficient random access operations as well as efficient compression of shape and transparency information.Alpha planes
Binary (each pixel is either 0 or 255). Grey scale (each pixel is 8 bit).