Method for detecting creak of eggs of poultry
A detection method and poultry egg technology, which is applied in the field of poultry egg crack detection, can solve the problems of difficult and inaccurate judgment, insufficiently intuitive judgment means, and not suitable for automatic processing of poultry eggs, etc., and achieve good sensitivity and stability.
Inactive Publication Date: 2009-02-04
ZHEJIANG UNIV
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Problems solved by technology
However, the various signal processing methods currently used by people still have certain defects, which lead to the intuition of the judgment method is not intuitive enough, the judgment is difficult and inaccurate, and it is not suitable for the requirements of automatic processing of poultry eggs.
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[0014] refer to figure 1 , reference numeral 1 is the egg to be tested, and the hardware adopted in this embodiment includes
[0015] 1), small hammer 2, it can be made of harder wooden material or polymer material;
[0016] 2), sound sensor 3, it can adopt general electret microphone;
[0017] 3), preamplifier 4 and A / D converter 5, also can adopt commonly used corresponding device;
[0018] 4), computer 6.
[0019] In this embodiment, the signal sampling frequency used is 200kHz. After the sound signal is converted into a digital signal, it is transmitted to a computer, and then the computer performs a short-time Fourier transform and draws a corresponding two-dimensional frequency distribution map to realize detection. The length of the short-time Fourier transform can be determined according to the duration of the egg sound signal and the sampling frequency used by the A / D converter. In general, the length of the short-time Fourier transform can be selected as 256 poi...
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The present invention provides a poultry egg crack detection method. The method comprises the following steps in sequence: firstly, the poultry egg is beaten; secondly, the sound response after the poultry egg is beaten is collected, amplified and then transformed into digital signals by an A / D converter; thirdly, according to the selected short-time Fourier transformation length, each section of sound signals are processed through short-time Fourier transformation in the time sequence, and the sound signals in the original time domain are transformed onto the frequency domain to acquire the frequency information of the sound signals at each time point; fourthly, the time and the frequency are respectively used as coordinate axes to build a two-dimensional coordinate system, and the amplitude information of each frequency component at each time point is mapped to acquire a two-dimensional distribution map of frequency signals; fifthly, the two-dimensional graphic mode of the two-dimensional distribution map of the frequency signals is applied to judge whether the poultry egg has a crack. The technical proposal of the method can directly, rapidly and conveniently detect the poultry crack, and has better sensitivity and stability.
Description
technical field [0001] The invention relates to the field of automatic poultry egg production and processing, in particular to a crack detection method for poultry eggs. Background technique [0002] Poultry eggs such as eggs and duck eggs are a kind of main food for people due to their rich nutritional value. With the development of modern poultry farms, after poultry eggs are laid, the degree of automation required for follow-up processing is getting higher and higher. People have developed a series of automated machinery to clean, grade, and remove bad eggs from poultry eggs. Function. Thereby greatly improving labor productivity. Among them, automatic detection of poultry egg cracks is a very important task. [0003] Several studies have been carried out on the automatic detection of cracks in poultry eggs. The most important method now is to use acoustic methods for detection. The main principle is to first hit the eggshell with a small hammer, then use a microphone...
Claims
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Inventor 吴坚平建峰应义斌
Owner ZHEJIANG UNIV