//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
double STDEV(std::vector<double> DIAM) {
double temp = 0;
double mean = MEAN(DIAM);
for (unsigned int i = 0; i < DIAM.size(); i++) {
temp += (mean - DIAM[i])*(mean - DIAM[i]);
}
return sqrt( temp / (1.0 * DIAM.size()) );
}
// Computes the variance of char positioning (width + spacing) wrt norm_height
FLOAT32 get_gap_variance(WIDTH_RECORD *wrec, float norm_height) {
MEASUREMENT ws;
new_measurement(ws);
for (int x = 0; x < wrec->num_chars - 1; x++) {
FLOAT32 gap_ratio = (wrec->widths[2 * x] + wrec->widths[ 2*x + 1])
* 1.0 / norm_height;
ADD_SAMPLE(ws, gap_ratio);
}
if (segment_adjust_debug > 2)
tprintf("Gap Mean=%g Var=%g\n", MEAN(ws), VARIANCE(ws));
return VARIANCE(ws);
}
// Computes the variance of the char widths normalized to the given height
// TODO(dsl): Do this in a later stage and use char choice info to skip
// punctuations.
FLOAT32 get_width_variance(WIDTH_RECORD *wrec, float norm_height) {
MEASUREMENT ws;
new_measurement(ws);
for (int x = 0; x < wrec->num_chars; x++) {
FLOAT32 wh_ratio = wrec->widths[2 * x] * 1.0f / norm_height;
if (x == wrec->num_chars - 1 && wh_ratio > 0.3)
continue; // exclude trailing punctuation from stats
ADD_SAMPLE(ws, wh_ratio);
}
if (segment_adjust_debug > 2)
tprintf("Width Mean=%g Var=%g\n", MEAN(ws), VARIANCE(ws));
return VARIANCE(ws);
}
