Noises and background produced by the absorption of water in spectra signal are the main interference for prediction accuracy of quantitative calibration in blood glucose noninvasive measurement.By utilizing wavelet transform,the spectra signal can be split into multi-scale approximation and detail component.According to uninformative variable elimination(UVE) criterion,it is possible to distinguish the high-scale approximation component which presents background and low-scale detail coefficients which pres...