5.3.4.39. Function features_compute_magnitude

Defined in File features_compute.h

5.3.4.39.1. Function Documentation

void features_compute_magnitude(const uint8_t **img, const int i0, const int i1, const int j0, const int j1, const uint32_t **labels, const RoI_basic_t *RoIs_basic, RoI_magn_t *RoIs_magn, const size_t n_RoIs)

Compute magnitude features. The magnitude represents the brightness of a RoI. In a first time, the sum of the pixels intensities is performed. In a second time, the noise level around the connected-component is subtracted to give a better estimation of the real brightness. The magnitude can be defined as follow: \( M = \displaystyle\sum_{p=0} ^{P} i_p - \big((\displaystyle\sum_{n=0} ^{N} i_n) / N\big) \times P\), where \(P\) is the the number of pixels in the current CC, \(i_x\) is the brightness of the pixel \(x\) and \(N\) is the number of noisy pixels considered. In addition, this function can also compute the saturation counter for each RoI (e. g. the number of pixels that have an intensity \(i_x = 255\)).