Algorithms have been developed for controlling the calibration and the measurement cycles of hyperspectral equipment. Special calibration and preprocessing methods were necessary to obtain suitable signal level and acceptable repeatability of the measurements. Therefore, the effect of the noise of NIR sensor was decreased, the signal level was enhanced and stability was ensured simultaneously. In order to investigate the properties of the number of objects suitable for statistical analysis, the enormous size of acquired hypercube (gigabytes per object) should be reduced by vector-to-scalar mathematical operators in real-time to extract the desired features. The algorithm developed was able to calculate the score of operators during scanning and the matrices were displayed as pseudo-images to show the distribution of the properties on the surface. The operators had to be determined by analysis of a sample set in preliminary experiments. Stored carrot was chosen as a model sample for investigation of the detection of moisture loss by hyperspectral properties. Determination of the proper operator on different tissues could help to analyze and model drying process and to control storage. Hyperspectral data of different carrot cultivars were tested under different storage conditions. Using improved measurement method the spectral parameter of the suitable operator described quite well the moisture loss of the different carrot tissues.
Abu-Khalaf, N., Bennedsen, B. S. & Bjørn, G. K. (2004) Distinguishing carrot’s characteristics by near infrared (NIR) reflectance and multivariate data analysis. Agricultural Engineering International: the CIGR Journal of Scientific Research and Development . Manuscript FP 03 012 6:1–17.
Champagne, C.M., Staenz, K., Bannari, A., McNairn, H. & Deguise, J-C. (2003) Validation of a hyperspectral curve-fitting model for the estimation of plant water content of agricultural canopies. Remote Sensing of Environment , Volume 87, Issues 2–3, 148–160.
Deguise J.-C. , 'Validation of a hyperspectral curve-fitting model for the estimation of plant water content of agricultural canopies ' (2003 ) 87 Remote Sensing of Environment : 148 -160 .
Chan, R. H., Ho, Ch-W. & Nikolova, M. (2005) Salt-and-Pepper Noise Removal by Median-type Noise Detectors and Edge-preserving Regularization. IEEE Transactions on Image Processing , 14 (2005), 1479–1485.
Nikolova M. , 'Salt-and-Pepper Noise Removal by Median-type Noise Detectors and Edge-preserving Regularization ' (2005 ) 14 IEEE Transactions on Image Processing : 1479 -1485 .
Cho, B.-K., Chen, Y.-R., Kim, M.S. (2007) Multispectral detection of organic residues on poultry processing plant equipment based on hyperspectral reflectance imaging technique. Computers and Electronics in Agriculture , Volume 57, Issue 2, 177–189.
Kim M.S. , 'Multispectral detection of organic residues on poultry processing plant equipment based on hyperspectral reflectance imaging technique ' (2007 ) 57 Computers and Electronics in Agriculture : 177 -189 .
De Belie, N., Pedersen, D. K., Martens, M., Bro R., Munck, L. & Baerdemaeker, J. D. (2003) The Use of Visible and Near-Infrared Reflectance Measurements to assess Sensory Changes in Carrot Texture and Sweetness during Heat Treatment. Biosystems Engineering , Volume 85, Issue 2, 213–225.
Baerdemaeker J. D. , 'The Use of Visible and Near-Infrared Reflectance Measurements to assess Sensory Changes in Carrot Texture and Sweetness during Heat Treatment ' (2003 ) 85 Biosystems Engineering : 213 -225 .
Firtha, F., Fekete, A., Kaszab, T., Takács, P., Herold, B., Herppich, W., Borsa, B. Kovács, L. (2006) Analysis of Carrot Drying by Hyperspectral Imaging. EurAgEng 2006, Bonn: Agricultural Engineering for a Better World , poster no 926, fulltext no. 440119580699 (ISBN 3-18-091958-2)
Herppich, W. B., Mempel, H., Geyer, M., (1999) Effects of postharvest mechanical and climatic stress on carrot tissue water relations. Postharvest Biology and Technology , Volume 16, Issue 1, 43–49.
Geyer M. , 'Effects of postharvest mechanical and climatic stress on carrot tissue water relations ' (1999 ) 16 Postharvest Biology and Technology : 43 -49 .
Hruschka, W. R. (1987) Data analysis: Wavelength selection methods. In Near-Infrared Technology in the Agricultural and Food Industries. 35–55. P. C. Williams and K. H. Norris, eds. St. Paul, Minn.: American Association of Cereal Chemists.
Hruschka W. R. , '', in Near-Infrared Technology in the Agricultural and Food Industries , (1987 ) -.
Jung, A., Kardeván, P. & Tőkei, L. (2006) Hyperspectral technology in vegetation analysis. Progress in Agricultural Engineering Sciences 2, 95–117.
Tőkei L. , 'Hyperspectral technology in vegetation analysis ' (2006 ) 2 Progress in Agricultural Engineering Sciences : 95 -117 .
Lawrence, K. C., Park, B., Windham, W. R. & Mao, C. (2003) Calibration of a Pushbroom Hyperspectral Imaging System for Agricultural Inspection. Transactions of the ASAE . Vol. 46(2): 513–521.
Mao C. , 'Calibration of a Pushbroom Hyperspectral Imaging System for Agricultural Inspection ' (2003 ) 46 Transactions of the ASAE : 513 -521 .
Lefcout, A. M., Kim, M. S., Chen, Y.-R., Kang, S. (2006) Systematic approach for using hyperspectral imaging data to develop multispectral imagining systems: Detection of feces on apples. Computers and Electronics in Agriculture , Volume 54, Issue 1, 22–35.
Kang S. , 'Systematic approach for using hyperspectral imaging data to develop multispectral imagining systems: Detection of feces on apples ' (2006 ) 54 Computers and Electronics in Agriculture : 22 -35 .
MathSoft (1994) Mathcad Reference Guide. MathSoft Engineering and Education Inc., Cambridge, MA, USA.
'', in Mathcad Reference Guide , (1994 ) -.
Meer, F. & Jong, S. M. (2001) Imaging Spectrometry: Basic Principles and Prospective Application. Remote Sensing and Digital Image Processing , Kluwer Academic Publishers, 2001, Netherlands
Jong S. M. , '', in Remote Sensing and Digital Image Processing , (2001 ) -.
Meer, F. (2004) Analysis of spectral absorption features in hyperspectral imagery. International Journal of Applied Earth Observation and Geoinformation , Volume 5, Issue 1, 55–68.
Meer F. , 'Analysis of spectral absorption features in hyperspectral imagery ' (2004 ) 5 International Journal of Applied Earth Observation and Geoinformation : 55 -68 .
Meer, F. (2006) The effectiveness of spectral similarity measures for the analysis of hyperspectral imagery. International Journal of Applied Earth Observation and Geoinformation , Volume 8, Issue 1, 3–17.
Meer F. , 'The effectiveness of spectral similarity measures for the analysis of hyperspectral imagery ' (2006 ) 8 International Journal of Applied Earth Observation and Geoinformation : 3 -17 .
Némethy, H. & Fehér M. (2002) Changes in the dry matter and sugar content of nantes type carrots during storage. International Journal of Horticultural Science . Vol. 8. 67–71.
Fehér M. , 'Changes in the dry matter and sugar content of nantes type carrots during storage ' (2002 ) 8 International Journal of Horticultural Science : 67 -71 .
Nicolai, B. M., Lötze, E., Peirs, A., Scheerlinck, N., Theron, K. I. (2006) Non-destructive measurement of bitter pit in apple fruit using NIR hyperspectral imaging. Postharvest Biology and Technology , Volume 40, Issue 1, 1–6.
Theron K. I. , 'Non-destructive measurement of bitter pit in apple fruit using NIR hyperspectral imaging ' (2006 ) 40 Postharvest Biology and Technology : 1 -6 .
Ruiz-Lopez, I. I., Cordova, A. V., Rodrıguez-Jimenes, G. C. & Garcıa-Alvarado, M. A. (2004) Moisture and temperature evolution during food drying: effect of variable properties. Journal of Food Engineering 63. 117–124.
Garcıa-Alvarado M. A. , 'Moisture and temperature evolution during food drying: effect of variable properties ' (2004 ) 63 Journal of Food Engineering : 117 -124 .
Ryan, M. J. & Arnold, J. A. (1997) Lossy compression of hyperspectral data using vector quantization. Remote Sensing of Environment , Volume 61, Issue 3, 419–436.
Arnold J. A. , 'Lossy compression of hyperspectral data using vector quantization ' (1997 ) 61 Remote Sensing of Environment : 419 -436 .
Tsai, F. & Philpot, W. (1998) Derivative analysis of hyperspectral data. Remote Sensing of Environment , Volume 66, Issue 1, 41–51.
Philpot W. , 'Derivative analysis of hyperspectral data ' (1998 ) 66 Remote Sensing of Environment : 41 -51 .
Vranic, M., Knezevic, M., Seregély, Zs., Bosnjak, K., Leto, J. & Perculija G. (2005) Prediction of dry matter and crude protein content in fresh grass silage by near infrared spectroscopy. Progress in Agriculture Engineering Sciences 1, 57–75.
Perculija G. , 'Prediction of dry matter and crude protein content in fresh grass silage by near infrared spectroscopy ' (2005 ) 1 Progress in Agriculture Engineering Sciences : 57 -75 .
Warner, T. A. & Shank, M. C. (1997). Spatial autocorrelation analysis of hyperspectral imagery for feature selection. Remote Sensing of Environment , Volume 60, Issue 1, 58–70.
Shank M. C. , 'Spatial autocorrelation analysis of hyperspectral imagery for feature selection ' (1997 ) 60 Remote Sensing of Environment : 58 -70 .
Xing, J., Saeys, W., Baerdemaeker J. D. (2007). Combination of chemometric tools and image processing for bruise detection on apples. Computers and Electronics in Agriculture , Volume 56, Issue 1, 1–13.
Baerdemaeker J. D. , 'Combination of chemometric tools and image processing for bruise detection on apples ' (2007 ) 56 Computers and Electronics in Agriculture : 1 -13 .
Zude, M., Birlouez-Aragon, I., Paschold P.-J., Rutledge, D. N. (2007) Non-invasive spectrophotometric sensing of carrot quality from harvest to consumption. Postharvest Biology and Technology , Volume 45, Issue 1, 30–37.
Rutledge D. N. , 'Non-invasive spectrophotometric sensing of carrot quality from harvest to consumption ' (2007 ) 45 Postharvest Biology and Technology : 30 -37 .