Tool Universal Image Quality Index

The Universal Image Quality Index compares two grids (greyscale images) using the three parameters luminance, contrast and structure. This is done for each pixel using a moving window as specified by the kernel radius.

References

Lasaponara, R. & Masini, N. (2012): Image Enhancement, Feature Extraction and Geospatial Analysis in an Archaeological Perspective. In: Lasaponara, R. & Masini, N. [Eds.]: Satellite Remote Sensing - A New Tool for Archaeology, S. 17-64. Springer Link.
Wang, Z. & Bovik, A.C. (2002): A universal image quality index. IEEE Signal Processing Letters, vol.9, no.3, pp.81-84. IEEE-Xplore.

Author: M.Ambrosi (c) 2017
Menu: Imagery|Analysis

Parameters

	Name	Type	Identifier	Description	Constraints
Input	First Grid	Grid (input)	`GRID_A`	-	-
Input	Second Grid	Grid (input)	`GRID_B`	-	-
Output	Universal Image Quality Index	Grid (output)	`QUALITY`	The product of correlation, luminance and contrast similarity.	-
	Correlation (*)	Grid (optional output)	`CORRELATION`	The correlation coefficient.	-
	Luminance (*)	Grid (optional output)	`LUMINANCE`	The similarity of mean luminance.	-
	Contrast (*)	Grid (optional output)	`CONTRAST`	The similarity of contrast.	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	k1	Floating point	`K1`	-	Minimum: 0.000000 Maximum: 1.000000 Default: 0.010000
	k2	Floating point	`K2`	-	Minimum: 0.000000 Maximum: 1.000000 Default: 0.030000
	L	Integer	`L`	The dynamic range for the image pixel, i.e. the number of different grey values.	Minimum: 1 Default: 255
	Kernel Type	Choice	`KERNEL_TYPE`	The kernel's shape.	Available Choices: [0] Square [1] Circle Default: 1
	Radius	Integer	`KERNEL_RADIUS`	cells	Minimum: 0 Default: 2
(*) optional

Command-line

Usage: saga_cmd imagery_tools 13 [-GRID_A <str>] [-GRID_B <str>] [-QUALITY <str>] [-CORRELATION <str>] [-LUMINANCE <str>] [-CONTRAST <str>] [-K1 <double>] [-K2 <double>] [-L <num>] [-KERNEL_TYPE <str>] [-KERNEL_RADIUS <num>]
  -GRID_A:<str>       	First Grid
	Grid (input)
  -GRID_B:<str>       	Second Grid
	Grid (input)
  -QUALITY:<str>      	Universal Image Quality Index
	Grid (output)
  -CORRELATION:<str>  	Correlation
	Grid (optional output)
  -LUMINANCE:<str>    	Luminance
	Grid (optional output)
  -CONTRAST:<str>     	Contrast
	Grid (optional output)
  -K1:<double>        	k1
	Floating point
	Minimum: 0.000000
	Maximum: 1.000000
	Default: 0.010000
  -K2:<double>        	k2
	Floating point
	Minimum: 0.000000
	Maximum: 1.000000
	Default: 0.030000
  -L:<num>            	L
	Integer
	Minimum: 1
	Default: 255
  -KERNEL_TYPE:<str>  	Kernel Type
	Choice
	Available Choices:
	[0] Square
	[1] Circle
	Default: 1
  -KERNEL_RADIUS:<num>	Radius
	Integer
	Minimum: 0
	Default: 2