pca
| Line 24: | Line 24: | ||
data: 600x600x3 array of double, bip format [8,640,000 bytes] | data: 600x600x3 array of double, bip format [8,640,000 bytes] | ||
| | | | ||
| − | Original Image | + | Original 3-band Image: |
[[Image:unfiltered.png|250px]] | [[Image:unfiltered.png|250px]] | ||
| − | Three principal components | + | Three principal components: |
[[Image:comp1.png|250px]] [[Image:comp2.png|250px]] [[Image:comp3.png|250px]] | [[Image:comp1.png|250px]] [[Image:comp2.png|250px]] [[Image:comp3.png|250px]] | ||
| + | |||
| + | Original 6-band Image: | ||
| + | |||
| + | [[Image:NYC-Band_Comparison.PNG|300px]] | ||
| + | |||
| + | Six principal components: | ||
| + | |||
| + | [[Image:NYC-PCA-C1.PNG|300px]] [[Image:NYC-PCA-C2.PNG|300px]] [[Image:NYC-PCA-C3.PNG|300px]] [[Image:NYC-PCA-C4.PNG|300px]] [[Image:NYC-PCA-C5.PNG|300px]] [[Image:NYC-PCA-C6.PNG|300px]] | ||
| + | |||
| | | | ||
*[[mxm]] | *[[mxm]] | ||
| Line 36: | Line 45: | ||
*[[covar]] | *[[covar]] | ||
| | | | ||
| + | *[[eigen2]] | ||
| + | *[[kt1]] | ||
| + | *[[kt2]] | ||
| + | *[[kt3]] | ||
| + | *[[kt4]] | ||
| + | *[[kt5]] | ||
| + | *[[kt6]] | ||
*[[pca2]] | *[[pca2]] | ||
*[[pca_byte]] | *[[pca_byte]] | ||
| − | |||
| | | | ||
*general_science.dvrc | *general_science.dvrc | ||
Latest revision as of 17:36, 15 July 2012
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Contents: Description, Arguments, Usage, Examples, Images, Sub-Functions, Related Functions, Source Supported Under Version: > 1.02
Description Principal Component Analysis Compute the principal components of an N band real data image NOTE: for the old 3 band pca version see pca_byte(). This version replaced the old byte version on 2-9-2011
Arguments and Return Values Arguments: A numeric array and ignore value Return Value: The rotated data
Usage Syntax: pca(image [, ignore=FLOAT][, struct=BOOL]) 'image' - A N-band image or data array 'ignore' - the ignore value for the black space of an image 'struct' - return the eigen vectors/values and covariance matrix
Examples dv> a 600x600x3 array of byte, bip format [1,080,000 bytes] dv> b=pca(a) data: 600x600x3 array of double, bip format [8,640,000 bytes]
Images Original 3-band Image:
Three principal components:
Original 6-band Image:
Six principal components:
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Recent Library Changes Created On: 02-15-2006 |
