Classification of areas using pixel-by-pixel and sample classifiers

There are no author-identified significant results in this report

NON-LINEAR CAMERA CALIBRATION FOR 3D RECONSTRUCTION USING STRAIGHT LINE PLANE OBJECT

One critical aspect to 3D reconstruction of human motion using videogrammetry is related to the need for an accurate calibration of large volumes. Most of calibration methods used in biomechanics requires the construction, transportation and measurement of rigid structures and this is more difficult when larger volumes are involved. Recently, alternative approaches have been proposed to overcome this critical aspect (Cerveri et al., 1998; Zhang, 2000). This work presents preliminary results of the proposition and evaluation of a non-linear camera calibration method for 3D reconstruction using a plane object containing straight lines

The effect of feed supplementation with inulin on boar taint levels and meat quality of entire male pigs

Received: March 19th, 2022 ; Accepted: May 3rd, 2022 ; Published: July 5th, 2022 ; Correspondence: [email protected] and androstenone are the two main compounds responsible for the foul odour in entire male pigs’ meat, known as boar taint. This study evaluated the effect of feed supplementation with inulin on the boar taint levels of 30 entire male pigs. Two months before slaughter, the animals were allocated into three groups (n = 10). The control group received a standard commercial diet. The other groups were fed the same commercial diet with 3% and 6% added inulin, respectively. Results showed that inulin addition to the feed significantly reduced skatole levels in the pigs’ adipose tissue compared with the control group. The levels of androstenone were not affected by the dietary approach. Although there were differences in some parameters, the supplementation with inulin did not promote extensive changes in the meat quality parameters between the tested groups. When raising entire males, supplementation with inulin in finishing diets could be considered to reduce the boar taint perception by the consumer

Ocorrência de Magulacra nigripennata Dognin (Lepidoptera: Cossidae) em Cupuaçuzeiro no Estado do Amapá.

O Cupuaçuzeiro [Theobroma grandiflorum (Willd. Ex Spreng.) K. Schum. (Malvaceae)] é uma das espécies frutíferas nativas de maior importância econômica para a região Amazônica. Seu fruto é muito apreciado pela população local em virtude da polpa ser utilizada para elaboração de sucos, sorvetes, picolés, geleias, iogurtes, doces e compotas. Apesar de sua importância, a expansão dos cultivos de cupuaçu na região tem sido limitada por problemas fitossanitários. No mês de julho de 2014, em visita a um pomar de cupuaçuzeiro (1.300 plantas com 6 anos de idade) na Colônia Agrícola do Matapi (00º37?N e 51º25?W), município de Porto Grande, Amapá, foram detectadas plantas com sintomas de secamento de ramos terminais, geralmente tombam sobre a copa do cupuaçuzeiro. Aproximadamente 30% das plantas apresentavam esse sintoma. Os danos são decorrentes do ataque de uma lepidobroca Magulacra nigripennata Dognin (Lepidoptera: Cossidae), conhecida como broca-dos-ramos ou broca-doramo- terminal. A lagarta é de coloração avermelhada nas regiões ventral e cefálica, apresentando listras transversais de coloração marrom escuro e amarelado na região dorsal. O ataque inicia com a construção de galerias no interior do ramo terminal. Antes de pupar na galeria, provoca o anelamento basal do ramo, causando o seu secamento e abrindo uma galeria no sentido perpendicular à galeria, para saída do adulto. Geralmente ocorre uma lagarta por ramo atacado.Os danos estão associados ao secamento dos ramos terminais e posterior morte da planta. Este é o primeiro registro dessa espécie no estado do Amapá. Previamente a espécie foi reportada em cupuaçuzeiro no estado do Amazonas e em cacaueiro (Theobroma cacao L.) em Rondônia e Pará. Na Amazônia, as informações sobre a biologia e ecologia de M. nigripennata são inexistentes. Portanto, estudos relacionados à duração do ciclo de vida e flutuação populacional são prioritários para o desenvolvimento de estratégias de manejo adequadas.Resumo 1612

UNDERWATER NON-LINEAR CAMERA CALIBRATION: AN ACCURACY ANALYSIS

One of the most challenging problems associated with underwater 3D movement analysis is the accurate calibration of the cameras. Additional sources of errors are present in underwater acquisitions such as the nonlinear distortion caused by water interface, camera lenses (ex. wide angle) and housing’s glasses. Despite this, in the literature, systems based on a linear calibration model (DLT) were proposed (Yanai et al., 1996; Machtsiras & Sanders, 2009; Gourgoulis, et al. 2008). However, the results of underwater accuracy were not similar to those obtained out of the water. In Kwon, et al. 1999, the use of a modified DLT algorithm to model the distortion was proposed but the results of accuracy were not substantially improved, with Root Mean Square (RMS) values ranging from 5.6 to 7.2mm. Recently, alternative approaches were proposed to non-linear camera calibration and submillimeter accuracy was reached (Cerveri et al., 1998; Zhang, 2000; Pribanić, Sturm & Cifrek, 2008). However, these approaches were not applied underwater. In previous work, a new non-linear calibration method using a straight line plane object was proposed and tested out of the water (Silvatti et al., 2009 available in http://calib.googlecode.com). In this work, this novel method was tested in underwater conditions and its accuracy evaluated