[1] [1] J. B. Li et al., "A comparative study for the quantitative determination of soluble solids content, pH and firmness of pears by Vis/NIR spectroscopy," J. Food Eng. 116(2), 324–332 (2013).

[2] [2] B. B. Wedding et al., "Effects of seasonal variability on FT-NIR prediction of dry matter content for whole Hass avocado fruit," Postharvest Biol. Technol. 75, 9–16 (2013).

[3] [3] A. Morales-Sillero et al., "Feasibility of NIR spectroscopy for non-destructive characterization of table olive traits," J. Food Eng. 107(1), 99–106 (2011).

[4] [4] Y. Palapol et al., "Colour development and quality of mangosteen (Garcinia mangostana L.) fruit during ripening and after harvest," Postharvest Biol. Technol. 51(3), 349–353 (2009).

[5] [5] T. Sun, K. Huang, H. R. Xu, Y. B. Ying, "Research advances in nondestructive determination of internal quality in watermelon/melon: A review," J. Food Eng. 100, 569–577 (2010).

[6] [6] D. F. Jie et al., "Variable selection for partial least squares analysis of soluble solids content in watermelon using near-infrared diffuse transmission technique," J. Food Eng. 118, 387–392 (2013).

[7] [7] K. S. Chia, H. A. Rahim, R. A. Rahim, "Evaluation of common pre-processing approaches for visible (VIS) and shortwave negar infrared (SWNIR) spectroscopy in soluble solids content (SSC) assessment," Biosyst. Eng. 115, 82–88 (2013).

[8] [8] S. Bureau et al., "Rapid and non-destructive analysis of apricot fruit quality using FT-near-infrared spectroscopy," Food Chem. 113, 1323–1328 (2009).

[9] [9] E. D. Louw, K. I. Theron, "Robust prediction models for quality parameters in Japanese plums (Prunus salicina L.) using NIR spectroscopy," Postharvest Biol. Technol. 58, 176–184 (2010).

[10] [10] D. Dimitrovski et al., "The concentration of translycopene in postharvest watermelon: An evaluation of analytical data obtained by direct methods," Postharvest Biol. Technol. 58, 21–28 (2010).

[11] [11] H. W. Zhao, D. H. Han, S. H. Song, D. Chang, "Screening of maturity characterization factors for mini watermelon fruit," Trans. CSAE 28(17), 281– 286 (2012).

[12] [12] Y. Y. Li, H. W. Zhao, D. Chang, D. H. Han, "Maturity qualitative discrimination of small watermelon fruit," Spectrosc. Spect. Anal. 32(6), 1526–1530 (2012).

[13] [13] G. P. Moreda et al., "Non-destructive technologies for fruit and vegetable size determination — a review," J. Food Eng. 92, 119–136 (2009).

[14] [14] X. D. Sun et al., "Afast online method to measure and calculate the apple's cubage based on X-ray image," Acta Optica Sini-ca 27(11), 2096–2100 (2007).

[15] [15] D. H. Han et al., "Information collection of mini watermelon quality using near-infrared non-destructive detection," Trans. CSAE 44(7), 174–1788 (2013).

[16] [16] T. Ignat et al., "Nonlinear methods for estimation of maturity stage, total chlorophyll, and carotenoid content in intact bell peppers," Biosyst. Eng. 114, 414–425 (2013).

[17] [17] L. Jarquin-Enriquez et al., "Lycopene content and color index of tomatoes are affected by the greenhouse cover," Sci. Hortic. 155, 43–48 (2013).

[18] [18] R. Choudhary et al., "Rapid estimation of lycopene concentration in watermelon and tomato puree by fiber optic visible reflectance spectroscopy," Postharvest Biol. Technol. 52, 103–109 (2009).

[19] [19] Y. K. Peng, R. F. Lu, "Analysis of spatially resolved hyperspectral scattering images for assessing apple fruit firmness and soluble solids content," Postharvest Biol. Technol. 48, 52–62 (2008).

[20] [20] B. M. Nicolai et al., "Nondestructive measurement of fruit and vegetable quality by means of NIR spectroscopy: A review," Postharvest Biol. Technol. 46(2), 99–118 (2007).

[21] [21] R. Giangiacomo, "Study of water-sugar interactions at increasing sugar concentration by NIR spectroscopy," Food Chem. 96, 371–379 (2006).