Gamma LAT: Reference Manual

ave2pwr

ANSI-C program: ave2pwr.c

NAME
ave2pwr - Averages two registered backscatter intensity images.

SYNOPSIS
ave2pwr <pwr1> <pwr2> <pwr_out> <width> [scale_factor]

<pwr1>	intensity image 1 (float values)
<pwr2>	intensity image 2 (float values)
<pwr_out>	output file (float): (pwr1+scale_factor*pwr2)/2
<width>	number of samples/row
[scale_factor]	scale factor for image 2 (absolute value, not dB)(default: 1.0)

EXAMPLE
ave2pwr 1352_1610.pwr1 1352_1610.pwr2 1352_1610.pwr 2500

INSTALLATION
Source code ave2pwr.c in ./src. For compilation adjust and use Makefile: Executable version ave2pwr in ../bin

AVAILABILITY
Uses ISP type definition file typedef_ISP.h.

DESCRIPTION
ave2pwr reads the two backscatter intensity images (or other files of type float) and calculates for each pixel the average of the two images. Image 2 may be scaled with a userdefined factor. result= (pwr1+scale_factor*pwr2)/2. The program assumes that the two input images are registered to the same geometry (as it is the case for example for the two backscatter images of an interferometric pair. Averaging two backscatter intensity images allows to reduce the speckle noise and therby improve the spatial/radiometric resolution. The averaged data are written as the output file <pow_out> of type float.Format and size of the output file corresponds to the input files. The display and generation of hard copies of the resulting averaged image and the image intensities is supported by special programs allowing the generation of SUN raster or BMP format image files, a format accepted by most image processing software packages.

OPTIONS
Image 2 may be scaled using the user defined scale factor (linear scale, not dB values are used).

SEE ALSO
typedef_ISP.h, lin_comb .

DIAGNOSTICS
All messages are generally self-explanatory.

NOTES
None.