| 1. |
- Egelberg, Peter, et al.
(författare)
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Assessing cereal grain quality with a fully automated instrument using artificial neural network processing of digitized color video images
- 1995
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - 0819416789 ; 2345, s. 146-158
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Konferensbidrag (refereegranskat)abstract
- A fully integrated instrument for cereal grain quality assessment is presented. Color video images of grains fed onto a belt are digitized. These images are then segmented into kernel entities, which are subject to the analysis. The number of degrees of freedom for each such object is decreased to a suitable level for Artificial Neural Network (ANN) processing. Feed- forward ANN's with one hidden layer are trained with respect to desired features such as purity and flour yield. The resulting performance is compatible with that of manual human ocular inspection and alternative measuring methods. A statistical analysis of training and test set population densities is used to estimate the prediction reliabilities and to set appropriate alarm levels. The instrument containing feeder belts, balance and CCD video camera is physically separated from the 90 MHz Pentium PC computer which is used to perform the segmentation, ANN analysis and for controlling the instrument under the Unix operating system. A user-friendly graphical user interface is used to operate the instrument. The processing time for a 50 g grain sample is approximately 2 - 3 minutes.
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| 2. |
- Gustafsson, Mats, et al.
(författare)
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High-resolution digital transmission microscopy: a Fourier holography approach
- 2004
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Ingår i: Optics and Lasers in Engineering. - 0143-8166. ; 41:3, s. 553-563
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Tidskriftsartikel (refereegranskat)abstract
- A spherical reference field is used to construct a digital holographic system with a demonstrated resolution up to 228 line pairs per mm. The reference field originates from a GRIN lens placed 1 mm from the illuminated object. This allows the use of a standard sensor to record the hologram with the required numerical aperture. The image is determined by evaluation of the Rayleigh–Sommerfeld diffraction integral that relates the object field in the image plane to the object field in the sensor plane. Experimental results are given for two charge coupled device sensors and one complementary metal-oxide-semiconductor active pixel sensor.
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| 3. |
- Gustafsson, Mats, et al.
(författare)
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High resolution digital transmission microscopy : a Fourier holography approach
- 2002
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- A spherical reference field is used to construct a digital holography system with a demonstrated resolution down to 228 line pairs per mm. The reference field origin from a GRIN lens placed 1mm from the illuminated object. This allows the use of a standard sensor to record the hologram with the required numerical aperture. The image is determined by evaluation of the Rayleigh-Sommerfeld diffraction integral that relates the object field in the image plane to the object field in the sensor plane. Experimental results are given for two charge couple device sensors and one complementary metaloxide- semiconductor active pixel sensor.
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| 4. |
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| 5. |
- Öwall, Viktor, et al.
(författare)
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A custom image convolution DSP with a sustained calculation capacity of >1 GMAC/s and low I/O bandwidth
- 1999
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Ingår i: Journal of VLSI Signal Processing. - 0922-5773. ; 23:2-3, s. 335-349
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Tidskriftsartikel (refereegranskat)abstract
- A customized processor for real time image convolution has been designed to increase the performance of an instrument for automated cereal grain quality assessment. Image convolution requires an extensive amount of calculation capacity and a corresponding amount of data transfers, hard to achieve with standard processors in real time. Therefore, a tailored architecture with a streamlined dataflow has been developed with emphasis on a system design perspective. The designed processor has a sustained calculation capacity of >1 GMAC/s and on-chip line buffers reduce the amount of external data transfers. Hence, the complexity of the designed processor has been increased to gain a lower complexity of the complete system. To achieve powerful and versatile filtering the size of the programmable kernel functions have been maximized to 15 × 15.
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| 6. |
- Öwall, Viktor, et al.
(författare)
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A parallel 2Gops/s image convolution processor with low I/O bandwidth
- 1995
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Ingår i: [Host publication title missing]. - 1063-0988. - 0780327071 ; , s. 87-90
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Konferensbidrag (refereegranskat)abstract
- A customized image processor for real time convolution of an image has been developed. Image convolution requires an extensive amount of calculation capacity and I/O communication which is hard to sustain with standard processors in real time. Therefore, a customized processor has been designed with a tailored architecture. The processors have a total sustained calculation capacity of >2G arithmetic operations/s at 20 MHz clock frequency, surpassing that of TMS320C80 for this application due to the tailored architecture.
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