Universal Image Quality Index

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

Description

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.

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, output, optional	`CORRELATION`	The correlation coefficient.	-
	Luminance	grid, output, optional	`LUMINANCE`	The similarity of mean luminance.	-
	Contrast	grid, output, optional	`CONTRAST`	The similarity of contrast.	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	k1	floating point number	`K1`	-	Minimum: 0.000000 Maximum: 1.000000 Default: 0.010000
	k2	floating point number	`K2`	-	Minimum: 0.000000 Maximum: 1.000000 Default: 0.030000
	L	integer number	`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 number	`KERNEL_RADIUS`	cells	Minimum: 0 Default: 2

Command Line

Usage: saga_cmd imagery_tools 13 [-GRID_A ] [-GRID_B ] [-QUALITY ] [-CORRELATION ] [-LUMINANCE ] [-CONTRAST ] [-K1 ] [-K2 ] [-L ] [-KERNEL_TYPE ] [-KERNEL_RADIUS ]
  -GRID_A:       	First Grid
	grid, input
  -GRID_B:       	Second Grid
	grid, input
  -QUALITY:      	Universal Image Quality Index
	grid, output
  -CORRELATION:  	Correlation
	grid, output, optional
  -LUMINANCE:    	Luminance
	grid, output, optional
  -CONTRAST:     	Contrast
	grid, output, optional
  -K1:        	k1
	floating point number
	Minimum: 0.000000
	Maximum: 1.000000
	Default: 0.010000
  -K2:        	k2
	floating point number
	Minimum: 0.000000
	Maximum: 1.000000
	Default: 0.030000
  -L:            	L
	integer number
	Minimum: 1
	Default: 255
  -KERNEL_TYPE:  	Kernel Type
	choice
	Available Choices:
	[0] Square
	[1] Circle
	Default: 1
  -KERNEL_RADIUS:	Radius
	integer number
	Minimum: 0
	Default: 2