#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include "img.h"
#include "imgmax.h"
#include "include/imgproc.h"
#include "include/imgthrs.h"

Include dependency graph for imgthrs.c:

Functions
int	imgThresholding (IMG img, float threshold_level, int thr_nr)
int	imgThresholdingLowHigh (IMG img, float lower_threshold_level, float upper_threshold_level, IMG timg, int lower_thr_nr, int upper_thr_nr)
int	imgThresholdTemplateCount (IMG img, float minValue, float maxValue, IMG timg, int *count)
int	imgThresholdTemplate (IMG img, float minValue, float maxValue, IMG timg)
int	imgThresholdByTemplate (IMG img, IMG templt, float thrValue)
void	imgCutoff (IMG *image, float cutoff, int mode)
int	imgOutlierFilter (IMG *img, float limit)

Function Documentation

void imgCutoff	(	IMG *	image,
		float	cutoff,
		int	mode
	)

Pixel values that exceed or go under a user-defined limit are set to that limit value.

Parameters:

image	Pointer to IMG struct which will be filtered here
cutoff	Cutoff value
mode	Mode of operation: 0=pixels exceeding the limit are cut off, 1=pixels which go under the limit are cut off

Definition at line 349 of file imgthrs.c.

int imgOutlierFilter	(	IMG *	img,
		float	limit
	)

Filter out pixels that are over limit x higher than their closest 8 neighbour pixels.

Returns:: Returns the nr of filtered pixels, and negative value in case of an error.

Definition at line 383 of file imgthrs.c.

int imgThresholdByTemplate	(	IMG *	img,
		IMG *	templt,
		float	thrValue
	)

Threshold IMG by a template. Sets pixel values in img to thrValue, if corresponding pixel value in template is == 0. Only first plane of template is used.

Returns:: Returns 0, if ok.

Parameters:

img	Image to threshold
templt	Threshold template (1 frame) where 0=cut off
thrValue	Value which is written in cut off pixels

Definition at line 324 of file imgthrs.c.

int imgThresholding	(	IMG *	img,
		float	threshold_level,
		int *	thr_nr
	)

Threshold dynamic or static IMG data: pixel time-activity curves (TACs) which have AUC less than Threshold*Max_AUC will be set to zero.

Returns:: Returns 0, if ok.

Parameters:

img	IMG data
threshold_level	Threshold level, e.g. 0.50 will set to zero all pixels that are less than 50% of maximum pixel
thr_nr	Number of pixels that will fall below the threshold level; give NULL pointer, if not needed.

Definition at line 63 of file imgthrs.c.

References imgFrameIntegral().

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int imgThresholdingLowHigh	(	IMG *	img,
		float	lower_threshold_level,
		float	upper_threshold_level,
		IMG *	timg,
		int *	lower_thr_nr,
		int *	upper_thr_nr
	)

Threshold dynamic or static IMG data: Checks whether pixel AUCs are lower or higher than the specified threshold levels * Max_AUC. Those pixel TACs are set to zero, or alternatively, if template IMG is given, corresponding template pixel is set to 0.

Returns:: Returns 0, if ok.

Parameters:

img	(Dynamic) IMG data
lower_threshold_level	Lower threshold level, e.g. 0.10 will set to zero all pixels that are less than 10% of maximum pixel
upper_threshold_level	Upper threshold level, e.g. 0.90 will set to zero all pixels that are over 90% of maximum pixel
timg	Template image; if empty, then it will be allocated here; if pre-allocated, then template value changed to 0 when necessary, but 0 is never changed to 1; enter NULL, if original TACs are to be thresholded to zeroes
lower_thr_nr	Number of pixels that will fall below the lower threshold level; give NULL pointer, if not needed.
upper_thr_nr	Number of pixels that will fall below the lower threshold level; give NULL pointer, if not needed.

Definition at line 124 of file imgthrs.c.

References imgFrameIntegral().

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int imgThresholdTemplate	(	IMG *	img,
		float	minValue,
		float	maxValue,
		IMG *	timg
	)

Creates a template image based on lower and upper threshold values. This function allocates memory for the template. If pixel value in original image is >=minValue and <=maxValue, the corresponding template pixel is set to 1, otherwise to 0. Only the first frame of images are used.

Returns:: Returns 0 if ok.

Parameters:

img	Original image; only first frame is used here
minValue	Lower threshold
maxValue	Upper threshold
timg	Template image; if empty, then it will be allocated here; if pre-allocated, then template value changed to 0 when necessary, but 0 is never changed to 1

Definition at line 302 of file imgthrs.c.

References imgThresholdTemplateCount().

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int imgThresholdTemplateCount	(	IMG *	img,
		float	minValue,
		float	maxValue,
		IMG *	timg,
		int *	count
	)

Creates a template image based on lower and upper threshold values. This function allocates memory for the template. If pixel value in original image is >=minValue and <=maxValue, the corresponding template pixel is set to 1, otherwise to 0. Only the first frame of images are used.

Returns:: Returns 0 if ok.

Parameters:

img	Original image; only first frame is used here
minValue	Lower threshold
maxValue	Upper threshold
timg	Template image; if empty, then it will be allocated here; if pre-allocated, then template value changed to 0 when necessary, but 0 is never changed to 1
count	The number of pixels that pass the threshold limits is written here; set to NULL if not needed

Definition at line 241 of file imgthrs.c.

Referenced by imgThresholdTemplate().

Functions

Function Documentation