EECE253_12_Resampling

EECE253_12_Resampling - EECE\CS 253 Image Processing...

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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: 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. December 6, 2011 2 December 6, 2011 2 1999-2007 by Richard Alan Peters Three Methods for Resizing Images December 6, 2011 3 December 6, 2011 3 1999-2007 by Richard Alan Peters 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. December 6, 2011 4 December 6, 2011 4 1999-2007 by Richard Alan Peters 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. December 6, 2011 5 December 6, 2011 5 1999-2007 by Richard Alan Peters 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 December 6, 2011 6 December 6, 2011 6 1999-2007 by Richard Alan Peters 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 December 6, 2011 7 December 6, 2011 7 1999-2007 by Richard Alan Peters 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 December 6, 2011 8 December 6, 2011 8 1999-2007 by Richard Alan Peters 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 December 6, 2011 9 December 6, 2011 9 1999-2007 by Richard Alan Peters Reducing Images Through Pixel Decimation Example: decimate this image 4x to get this image....
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EECE253_12_Resampling - EECE\CS 253 Image Processing...

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