EECE253_10_PixelizationQuantization

EECE253_10_PixelizationQuantization - EECE\CS 253 Image...

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Unformatted text preview: EECE\CS 253 Image Processing Richard Alan Peters II Department of Electrical Engineering and Computer Science Fall Semester 2007 Lecture Notes Lecture Notes: Pixelization and Quantization This work is licensed under the Creative Commons Attribution-Noncommercial 2.5 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/2.5/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA. December 6, 2011 2 December 6, 2011 2 1999-2007 by Richard Alan Peters Pixelization is a special effect often used to hide identities December 6, 2011 3 December 6, 2011 3 1999-2007 by Richard Alan Peters Pixelization or to clean up an image. December 6, 2011 4 December 6, 2011 4 1999-2007 by Richard Alan Peters Pixelization and Quantization pixelated high-res image quantized pixelated & quantized December 6, 2011 5 December 6, 2011 5 1999-2007 by Richard Alan Peters Pixelization and Quantization pixel grid column index column index row index row index pixelated high-res image quantized pixelated & quantized December 6, 2011 6 December 6, 2011 6 1999-2007 by Richard Alan Peters Pixelization ) , ( I c r P ( 29 , I high-res image pixelated image Take the average within each square. Take the average within each square. ( upsampled ) December 6, 2011 7 December 6, 2011 7 1999-2007 by Richard Alan Peters Take the average within each square. Take the average within each square. ) , ( I c r P ( 29 , I high-res image pixelated image Pixelization ( upsampled ) December 6, 2011 8 December 6, 2011 8 1999-2007 by Richard Alan Peters Take the average within each square. Take the average within each square. ) , ( I c r P ( 29 , I high-res image pixelated image Pixelization ( upsampled ) December 6, 2011 9 December 6, 2011 9 1999-2007 by Richard Alan Peters Take the average within each square. Take the average within each square. ) , ( I c r P ( 29 , I high-res image pixelated image Pixelization ( upsampled ) December 6, 2011 10 December 6, 2011 10 1999-2007 by Richard Alan Peters Pixelization Procedure (Part 1) ( 29 ( 29 ( 29 ( 29 { } , , , I mean , , I , , DS b b c r c r N = ( 29 ( 29 ( 29 { } ( 29 { } . 1 1 , , 1 , , 1 1 , , 1 , , , - + + - + + = s c cs cs s r rs rs c r N To pixelize an R C B image I by a factor, s : Let I DS be an R / s C / s B image. Let the value of I DS at location ( r , c , b ) be the average value of I in the s-square neighborhood starting at ( rs , cs , b ). where December 6, 2011 11 December 6, 2011 11 1999-2007 by Richard Alan Peters Pixelization Procedure (Part 2) ( 29 ( 29 ( 29 ( 29 . , , for , , I , , I DS P c r b c r b N = ( 29 ( 29 ( 29 { } ( 29 { } ....
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This note was uploaded on 12/06/2011 for the course EECE 253 taught by Professor Alanpeters during the Summer '07 term at Vanderbilt.

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EECE253_10_PixelizationQuantization - EECE\CS 253 Image...

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