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The reflectance spectra from the hyperspectral images of apples were used to find the optimal wavelengths to discriminate the defect region from the normal region. The optimal wavelength was selected from the correlation analysis between the band ratio or wavelength difference and target regions. The spectral images of selected wavelength were used to validate the correlation analysis. The correlation coefficient value using the band ratio at correlation analysis was 0.91 and the using the difference was 0.79. Thus, the correlation analysis method is feasible to select the wavelength to discriminate defects from normal regions.