- Bit plane
A

**bit plane**of adigital discrete signal (such as image or sound) is a set ofbit s having the same position in the respectivebinary number s [*cite web*] .

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title =Bit Plane

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publisher =PC Magazine

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url =http://www.pcmag.com/encyclopedia_term/0,2542,t=bit+plane&i=38689,00.asp

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accessdate =2007-05-02For example, for

16-bit data representation there are 16 bit-planes: the first bit-plane contains the set of the most significant bit and the 16th contains the least significant bit.It is possible to see that the first bit-plane gives the roughest but the most critical approximation of values of a medium, and the higher the number of the bit plane, the less is its contribution to the final stage. Thus, adding bit-plane gives a better approximation.

Incrementing a bit plane by 1 gives the final result half of a value of a previous bit-plane. If a bit is set to 1, the half value of a previous bit-plane is added, otherwise it does not, defining the final value.

As an example, in

PCM sound encoding the first bit in sample denotes the sign of the function, or in the other words defines the half of the wholeamplitude values range, and the last bit defines the precise value. Replacement of more significant bits result in more distortion than replacement of less significant bits. In lossy media compression that uses bit-planes it gives more freedom to encode less significant bit-planes and it is more critical to preserve the more significant ones [*cite journal*] .

last =Cho

first =Chuan-Yu

authorlink =

coauthors =Chen, Hong-Sheng; Wang, Jia-Shung

title =Smooth Quality Streaming With Bit-Plane Labelling

journal =Visual Communications and Image Processing

volume =5690

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pages =2184–2195

publisher =The International Society for Optical Engineering

date =2005-07

url =http://adsabs.harvard.edu/abs/2005SPIE.5960.2184C

doi =10.1117/12.633501

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accessdate =2007-05-02

format =abstractBitplane is sometimes used as synonymous to

Bitmap ; however, technically the former refers to the location of the data in memory and the latter to the data itself [*cite web*]

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publisher =FOLDOC

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url =http://foldoc.org/foldoc.cgi?bit+plane

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accessdate =2007-05-02One aspect of using bit-planes is determining whether a bit-plane is random noise or contains significant information.

One method for calculating this is compare each pixel (X,Y) to three adjacent pixels (X-1,Y),(X,Y-1) and (X-1,Y-1). If the pixel is the same as at least two of the three adjacent pixels, it is not noise. A noisy bit-plane will have 49% to 51% pixels that are noise. [

*cite journal*]

last =Strutz

first =Tilo

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coauthors =

title =Fast Noise Suppression for Lossless Image Coding

journal =Proceedings of Picture Coding Symposium (PCS'2001), Seoul, Korea

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date =2001

url =http://citeseer.ist.psu.edu/strutz01fast.html

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accessdate =2008-01-15Many image processing packages can split an image into bit-planes. Open source tools such as Pamarith from

NetPbm and Convert fromImageMagick can be used to generate bit-planes.**See also***

Color depth

*Planar

*Binary image **References**

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2010.*