4.3 | 6 ratings Rate this file 195 downloads (last 30 days) File Size: 125.44 KB File ID: #9485

Quadtree decomposition (Encoding) and Decoding of RGB Image

02 Jan 2006 (Updated 18 Jul 2009)

Quadtree decomposition (Encoding) and Decoding of RGB Image of size M-by-N-by-3 (No toolbox required

File Information
Description	Quadtree decomposition of RGB image of size M-by-N-by-3. Three thresholds for red,green and blue components are used. For any R or G or B block if the maximum value of the block elements minus the minimum value of the block elements is greater than its respective threshold then the RGB block is split into 4 blocks. For lossy encoding (individual) mean value R,G,B are assign to RGB block. Image is padded if its size is not power of 2, so that image can be divided until block of size 1. Thresholds are specified as a value between 0 and 1 (0 for lossless encoding). If Image is of type uint8 then threshold value is multiplied by 255, if Image is of type uint16 then threshold value is multiplied by 65535, to determine the actual threshold. main.m --------- Test program for Quadtree decomposition (Encoding) and Decoding of RGB image (No toolbox required)
MATLAB release	MATLAB 6.5 (R13)
Zip File Content
Other Files	license.txt, rgbquadtree/avgofmatblks.m, rgbquadtree/converttoclass.m, rgbquadtree/delsparsekeybyxANDy.m, rgbquadtree/drawquadblocks.m, rgbquadtree/fillrect_ulwh.m, rgbquadtree/ispowerof2.m, rgbquadtree/main.m, rgbquadtree/padrgbtomakepowof2.m, rgbquadtree/padtomakepowof2.m, rgbquadtree/qt3ddecom.m, rgbquadtree/qtreedecode.m, rgbquadtree/qtreergbdecode.m, rgbquadtree/qtrgbsplit.m, rgbquadtree/rafting.png, rgbquadtree/readme_rgbquadtree.txt, rgbquadtree/splitinto4.m, rgbquadtree/trimsparse.m

Tags for This File
Everyone's Tags	compression, decoding, encoding, image, image analysis, quadtree, rgb, true color
Tags I've Applied
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Comments and Ratings (13)
03 Jan 2006	Eugene Konoplin
04 Jan 2006	J. Tai	Neat, works very well.
26 Feb 2007	vidya krishnamurthi	its very useful to me thank u
02 Jul 2007	Taner Ince
22 Sep 2007	selma salem	can I have a mfile qt3ddecomp to better understand a method.
24 Oct 2008	Saksono Setiardi	may i have the mfile from qt3ddecomp.p please...???
24 Nov 2008	Basheer	great work would you send me the mfile from qt3ddecomp.p please...???
02 Apr 2009	yxlvvv i	great work would you send me the mfile from qt3ddecomp.p please...,my e_mail:yxlvvv@qq.com thank you
15 Apr 2009	Pierrick Gérenton	good work !!! would you please send me the qt3ddecomp mfile ? thank you
24 Apr 2009	Robin	Really good work !!! would you please send me the qt3ddecomp m-file ? thank you so much Robin
30 May 2009	hbu	excellent
18 Jul 2009	Dr. Murtaza Khan	I updated the new version on 18-July, which includes two missing files delsparsekeybyxANDy.m and trimsparse.m. Please wait few days so that Matlab can approve and upload the new version in few days. thanks Author
20 Jul 2009	Dr. Murtaza Khan	New version has been uploaded. Fee free to use and comment on this program. Thanks Author

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Updates
05 Jan 2006	punctuaton correction and better description. No change in files.
03 May 2006	updated
09 Jul 2009	BSD License
18 Jul 2009	Missing files are included

Tag Activity for this File
Tag	Applied By	Date/Time
image analysis	Dr. Murtaza Khan	22 Oct 2008 08:11:05
quadtree	Dr. Murtaza Khan	22 Oct 2008 08:11:05
image	Dr. Murtaza Khan	22 Oct 2008 08:11:05
true color	Dr. Murtaza Khan	22 Oct 2008 08:11:05
rgb	Dr. Murtaza Khan	22 Oct 2008 08:11:05
encoding	Dr. Murtaza Khan	22 Oct 2008 08:11:05
decoding	Dr. Murtaza Khan	22 Oct 2008 08:11:05
compression	Dr. Murtaza Khan	22 Oct 2008 08:11:05

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