linearize Documentation

LINEARIZE - Linearize Mariner 9 images
PROGRAMMER:  MARS1::KEH (Ken Herkenhoff, Caltech)
Linearizes Mariner 9 images, using dark current frame from
PIC$MAR9 and calibration parameters described in
Herkenhoff et al. (1988).  Output image is 16-bit, input file must
be 8-bit.  DN values in output image are proportional to observed
brightness, calculated as follows for each pixel:
	OUTPUT = DNT + A*(DNT**3 - 128 DNT**2) where
	DNT = SCALE*(INPUT - 128*B*INPUT/(INPUT + D)) and A depends upon
the line L and sample S location in the frame:
	A = C(1)*L*L + C(2)*L + C(3)*S + C(4)*L*S + C(5)
The constants A, B, D and SCALE are different for each camera, and the
five C coefficients were found using preflight calibrations data.  An
estimate of the uncertainty in linearization is given in the reference.

Reference:
Herkenhoff, K. E., Soderblom, L. A., Murray, B. C. and Danielson, G. E.,
"Mariner 9 Television Calibration--Revisited" (submitted to Icarus, 1987)

Input image file name
(default extension is .cub)

NONE

Output image file name
(default extension is .cub)

NONE

ADDITIONAL NOTES:

Parm	Description
FROM	The input Mariner 9 image must be 8-bit, and should have had noise and reseaux removed. If the file extension is omitted, then ".cub" will be assumed.
TO	The output image will be 16-bit, ranging from 0 to about 350 DN maximum. DN values in the output image are proportional to the observed brightness only at the center of the image. If the file extension is omitted, then ".cub" will be assumed.