A Comparison Framework for Spectrogram Track Detection Algorithms

This paper presents a method to facilitate performance comparisons between different spectrogram track detection algorithms tested upon different data sets. There is no standard test database which is carefully tailored to test the different aspects of such algorithms and real data is often proprietary in nature. This naturally hinders the ability to perform comparisons between a developing algorithm and those which exist in the literature using the same test database. The method presented in this paper will allow researchers to present, in a graphical way, information regarding the data on which they test their algorithm while not disclosing proprietary information

Line Detection Methods for Spectrogram Images

Accurate feature detection is key to higher level decisions regarding image content. Within the domain of spectrogram track detection and classification, the detection problem is compounded by low signal to noise ratios and high track appearance variation. Evaluation of standard feature detection methods present in the literature is essential to determine their strengths and weaknesses in this domain. With this knowledge, improved detection strategies can be developed. This paper presents a comparison of line detectors and a novel linear feature detector able to detect tracks of varying gradients. It is shown that the Equal Error Rates of existing methods are high, highlighting the need for research into novel detectors. Preliminary results obtained with a limited implementation of the novel method are presented which demonstrate an improvement over those evaluated

Vitamina E no desempenho, características de carcaça e qualidade do presunto cozido de suínos Vitamin E on performance, carcass characteristics and quality of pig's cooked ham

O objetivo deste trabalho foi avaliar o efeito da vitamina E sobre o desempenho, características de carcaça e qualidade do presunto. Noventa e seis suínos foram submetidos aos seguintes tratamentos: controle, 100, 200 e 400 mg de vitamina E por kg de ração, fornecidas a partir de 116 dias antes do abate. Após o abate, as carcaças foram avaliadas, resfriadas, desossadas e o pernil foi removido para fabricação de presunto cozido. Análises dos teores de vitamina E e ácido tiobarbitúrico (TBARS) foram realizadas em amostras de pernil e de presunto. A média do ganho de peso foi 789,81 g por dia, do consumo 2.418 g por dia e da conversão alimentar 3,06. Os animais apresentaram 113,57 kg de peso vivo; 85,90 kg de peso de carcaça; 75,62% de rendimento de carcaça; 61,28 mm de profundidade de lombo; 23,16 mm de espessura de toucinho e 49,28% de carne magra. Amostras de presunto com suplementação de vitamina E apresentaram de 0,61 a 1,19 mg kg-1 de TBARS, contra 1,77 a 3,91 mg kg-1 de TBARS do controle. Dietas com 200 mg vitamina E por kg de ração reduziram os níveis de oxidação em 70% no presunto cozido e diminuíram a espessura de toucinho.<br>The objective of this work was to evaluate the effect of vitamin E on performance, carcass characteristics and cooked ham quality. Ninety-six pigs were submitted to the following treatments: control; 100, 200 and 400 mg of vitamin E per kg of diet; during 116 days before slaughter. After slaughter, pig carcasses were measured, chilled, deboned and ham sections were removed to produce the cooked ham. Samples of frozen and cooked ham were analysed in relation to vitamin E and thiobarbituric acid (TBARS) contents. Growth rate mean was 789.81 g per day, feed intake mean was 2,418 g per day and feed:gain ratio was 3.06. The carcass showed the following mean: 113.57 kg alive weight; 85.90 kg carcass weight; 75.62% carcass yield; 61.28 mm ham depth; 23.16 mm backfat thickness and 49.28% lean meat. The cooked ham samples with the best levels of vitamin E showed 0.61 to 1.19 mg kg-1 TBARS, against 1.77 to 3.91 mg kg-1 TBARS for the control. Levels of supplementation of 200 mg vitamin E per kg of diet reduce the oxidation levels up to 70% in cooked ham and decrease backfat thickness