EECE253_12_Resampling

EECE253_12_Resampling - EECE\CS 253 Image Processing...

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EECE\CS 253 Image Processing Richard Alan Peters II Department of Electrical Engineering and Computer Science Fall Semester 2007 Lecture Notes Lecture Notes: Resizing Images 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.
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27 April 2008 2 27 April 2008 2 1999-2007 by Richard Alan Peters II Three Methods for Resizing Images
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27 April 2008 3 27 April 2008 3 1999-2007 by Richard Alan Peters II Enlarging Images Through Pixel Replication Example: zoom this image 4x to get this image. Example: zoom this image 4x to get this image. Start with a blank image 4 times the linear dimensions of the original. Start with a blank image 4 times the linear dimensions of the original. Fill in every 4th pixel in every 4th row with the original pixel values. Fill in every 4th pixel in every 4th row with the original pixel values.
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27 April 2008 4 27 April 2008 4 1999-2007 by Richard Alan Peters II Enlarging Images Through Pixel Replication Detail showing every 4th pixel in every 4th row with the original pixel values. Detail showing every 4th pixel in every 4th row with the original pixel values.
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27 April 2008 5 27 April 2008 5 1999-2007 by Richard Alan Peters II For each original value: replicate it 15 times to create a new, larger “pixel”. For each original value: replicate it 15 times to create a new, larger “pixel”. Enlarging Images Through Pixel Replication
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27 April 2008 6 27 April 2008 6 1999-2007 by Richard Alan Peters II Reducing Images Through Pixel Decimation Example: decimate this image 4x to get this image. Example: decimate this image 4x to get this image. Decimation by a factor of n : take every n th pixel in every n th row
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27 April 2008 7 27 April 2008 7 1999-2007 by Richard Alan Peters II Reducing Images Through Pixel Decimation Example: decimate this image 4x to get this image. Example: decimate this image 4x to get this image. Zoom in on a section for a closer look at the process Zoom in on a section for a closer look at the process
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27 April 2008 8 27 April 2008 8 1999-2007 by Richard Alan Peters II Reducing Images Through Pixel Decimation Example: decimate this image 4x to get this image. Example: decimate this image 4x to get this image. Keep every 4th pixel in every 4th row Keep every 4th pixel in every 4th row
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27 April 2008 9 27 April 2008 9 1999-2007 by Richard Alan Peters II Reducing Images Through Pixel Decimation Example: decimate this image 4x to get this image. Example: decimate this image 4x to get this image. ignore all the others ignore all the others
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27 April 2008 10 27 April 2008 10 1999-2007 by Richard Alan Peters II Reducing Images Through Pixel Decimation Example: decimate this image 4x to get this image.
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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_12_Resampling - EECE\CS 253 Image Processing...

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