/usr/include/tesseract/measure.h is in libtesseract-dev 3.02.01-2.
This file is owned by root:root, with mode 0o644.
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********************************************************************************
*
* File: measure.h (Formerly measure.h)
* Description: Statistics for a group of single measurements
* Author: Mark Seaman, SW Productivity
* Created: Fri Oct 16 14:37:00 1987
* Modified: Mon Apr 8 09:42:28 1991 (Mark Seaman) marks@hpgrlt
* Language: C
* Package: N/A
* Status: Reusable Software Component
*
* (c) Copyright 1987, Hewlett-Packard Company.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
********************************************************************************
*/
#ifndef MEASURE_H
#define MEASURE_H
/*
----------------------------------------------------------------------
I n c l u d e s
----------------------------------------------------------------------
*/
#include <math.h>
/*
----------------------------------------------------------------------
T y p e s
----------------------------------------------------------------------
*/
typedef struct
{
long num_samples;
float sum_of_samples;
float sum_of_squares;
} MEASUREMENT;
/*
----------------------------------------------------------------------
M a c r o s
----------------------------------------------------------------------
*/
/**********************************************************************
* add_sample
*
* Add one more sample to a measurement.
**********************************************************************/
#define ADD_SAMPLE(m,s) \
(m.sum_of_samples += (float) (s), \
m.sum_of_squares += (float) (s) * (float) (s), \
++m.num_samples)
/**********************************************************************
* mean
*
* Return the mean value of the measurement.
**********************************************************************/
#define MEAN(m) \
((m).num_samples ? \
((float) ((m).sum_of_samples / (m).num_samples)) : \
0)
/**********************************************************************
* new_measurement
*
* Initalize a record to hold a measurement of a group of individual
* samples.
**********************************************************************/
#define new_measurement(m) \
((m).num_samples = 0, \
(m).sum_of_samples = 0, \
(m).sum_of_squares = 0)
/**********************************************************************
* number_of_samples
*
* Return the number of samples in a measurement.
**********************************************************************/
#define number_of_samples(m) \
((m).num_samples)
/**********************************************************************
* standard_deviation
*
* Return the standard deviation of the measurement.
**********************************************************************/
#define standard_deviation(m) \
((float) sqrt (VARIANCE (m)))
/**********************************************************************
* variance
*
* Return the variance of the measurement.
**********************************************************************/
#define VARIANCE(m) \
(((m).num_samples > 1) ? \
((float) \
(((m).num_samples * (m).sum_of_squares - \
(m).sum_of_samples * (m).sum_of_samples) / \
(((m).num_samples - 1) * (m).num_samples))) : \
0)
/**********************************************************************
* print_summary
*
* Summarize a MEASUREMENT record.
**********************************************************************/
#define print_summary(string,measure) \
cprintf ("\t%-20s \tn = %d, \tm = %4.2f, \ts = %4.2f\n ", \
string, \
number_of_samples (measure), \
MEAN (measure), \
standard_deviation (measure))
#endif
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