Download Computer Vision Technology for Food Quality Evaluation, by Da-Wen Sun PDF

By Da-Wen Sun

Computer imaginative and prescient expertise for nutrition caliber evaluate, moment Edition is still a important source to engineers, researchers, and technologists in learn and improvement, in addition to an entire connection with scholars drawn to this quickly increasing box. This new version highlights the newest advancements in imaging processing and research thoughts and technique, captures state of the art advancements in laptop imaginative and prescient know-how, and pinpoints destiny traits in examine and improvement for meals caliber and safeguard overview and keep watch over. it's a specific reference that gives a deep knowing of the problems of information acquisition and photograph research and gives options to resolve difficulties and additional strengthen effective tools for foodstuff caliber assessment.

  • Thoroughly explains what machine imaginative and prescient know-how is, what it will possibly do, and the way to use it for meals caliber evaluation
  • Includes a wide selection of machine imaginative and prescient options and purposes to judge a wide selection of foods
  • Describes the professionals and cons of other suggestions for caliber evaluation

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Extra info for Computer Vision Technology for Food Quality Evaluation, Second Edition

Sample text

1 Nuclear Tomography As the name implies, nuclear tomography involves the use of nuclear energy for imaging the two-dimensional spatial distribution of physical characteristics of the object, from a series of one-dimensional projections. All nuclear imaging modalities rely upon acquisition hardware featuring a ring detector, which measures the strength of radiation produced by the system. There are two general classes of sources of the radiations, typified by the degree of control exerted over them by the experimenter.

In principle, MRI is based on the association of each spatial region in a sample with a characteristic nuclear magnetic resonance frequency by imposing an external magnetic field. Without the external magnetic field, the magnetic moment will point at random in all directions. There will be no net magnetization. However, with the presence of a large magnetic field, the hydrogen nuclei will preferentially align their spin in the direction along the magnetic field. This is Lamour effect, and the frequency in which the nucleus precesses around the axis is termed as Lamour frequency (McCarthy, 1994).

When the light is not as intense as it should be, three possible damaging effects occur. Firstly, there may not be sufficient signal-to-noise ratio at the camera. Secondly, the electrical noise tends to increase as the light gets dimmer and less intense. Thirdly and most importantly, a less intense light will cause a significant loss in the camera depth-of-field. Additionally, effects from the ambient are more likely to occur under poor lighting conditions. Referring to Fig. 3 again, it can be seen that the incandescent source has a fairly normal distribution over the visible spectrum while the fluorescent has sharp peaks in some regions.

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