modPT.c File Reference

functions to manipulate lens correction coefficients and create stitcher scripts More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <ctype.h>
#include <math.h>
#include <limits.h>
#include "../include/jhead.h"
#include "../include/clens.h"

Classes
struct	Data1
	Measurement of 35mm film format diagonal. More...
Functions
double	getHfov (double foc)
	Calculate the Horizontal Field Of View (HFOV) for a given focal length, width, height, and multiplier.
void	coefD ()
	Calculate coefficient "d". Result put into the global variable coef1.d.
int	getCoefs ()
	Calculate the lens correction coefficients (a,b,c) for a particular focal length of a particular lens by linear interpolation of known coefficients for the lens. The global variable "thisLens" must be pointing to the lens of interest.
double	rad (double x)
	Convert degrees to radians.
double	deg (double x)
	Convert radians to degrees.
int	prepareScript (char *inFile)
	Write the script the stitching program will use to warp the image (ie remove the lens distortion).
Variables
const double	diag35 = 43.266615
	Measurement of 35mm film format diagonal.
Data1	coef1
	Holds hfov and correction coefficients for current image.
ExifInfo	exif
	Data structure to hold EXIF information.
CamNode	pCurCam
	Current camera being read in from profiles.
prefType	pref
	Data structure to hold program preferences.
CoefType	coef []
	Array of lens correction coefficient data types.
LnsNode *	thisLens
	Pointer to lens for current correction.
CamNode *	thisCamera
	Pointer to camera for current correction.

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Detailed Description

functions to manipulate lens correction coefficients and create stitcher scripts

Author:

Tim Jacobs (ported from Thomas Niemann's PTLens code)

Date:

2004.11.13

Full Description here.

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Function Documentation

double deg (  double  x  )

Convert radians to degrees. Returns: The value in degrees Parameters: x  The input in radians

int getCoefs (   )

Calculate the lens correction coefficients (a,b,c) for a particular focal length of a particular lens by linear interpolation of known coefficients for the lens. The global variable "thisLens" must be pointing to the lens of interest. Returns: 1 if unsuccessful, 0 otherwise. If successful, coef1.a, coef1.b, coef1.c, and coef.d are populated.

double getHfov (  double  foc  )

Calculate the Horizontal Field Of View (HFOV) for a given focal length, width, height, and multiplier. Returns: The HFOV. Parameters: foc  The focal length of the lens when the picture was taken. Read from EXIF data.

int prepareScript (  char *  inFile  )

Write the script the stitching program will use to warp the image (ie remove the lens distortion). Returns: 0 if successful, 3 if there is a problem getting the coefficients, 5 if all coefficients are 0, 4 if unable to open the script file. Parameters: inFile  The file name for the input image

double rad (  double  x  )

Convert degrees to radians. Returns: The value in radians Parameters: x  The input in degrees

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Variable Documentation

const double diag35 = 43.266615

Measurement of 35mm film format diagonal. if assuming 23.3 x 35 (phil's web site) then diag35 = 42.046284 if assuming 36 x 24 diag35 = 43.266615

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