AA7075 ve kompozitlerin sertlik değerleri

Autores Oliveira Junior & Thomaz, 2006. País do grupo de pesquisa Brasil.

Acesso ao banco Acesso através do site, com livre download: http://fei.edu.br/~cet/facedatabase.html Imagens 2.800 imagens (14 imagens por indivíduo).

400 imagens frontais [Subgrupo imagens frontais]. Tamanho e cor; Pano de fundo 640x480 coloridas; Pano de fundo branco.

360 x 260 [Subgrupo imagens frontais].

Tipo Tipo 3x4: cabeça com cabelo, pescoço, parte dos ombros e tronco. Subgrupo imagens frontais: cabeça com cabelo e parte do pescoço. Condições/Ângulos 4 versões frontais e 10 versões laterais.

2 versões frontais [Subgrupo imagens frontais].

Padronização Alinhamento das faces apenas do subgrupo imagens frontais. Qualidade geral Boa qualidade e boa iluminação.

Indivíduos 200 adultos (100♀; 100♂). Faixa de idade indivíduos 18-70 anos.

Etnia/cor indivíduos Caucasianos, pardos e negros. Expressão facial Expressão facial neutra e alegre.

Análise geral dos bancos

É possível afirmar que cada banco de faces apresentado neste trabalho tem características diferentes que devem ser observadas pelos pesquisadores a depender do tipo de imagens que necessitam.

Para os pesquisadores interessados em analisar diferentes expressões faciais, sugere-se escolher bancos que contaram com avaliação de juízes leigos e/ou especialistas para validar as emoções, havendo bancos em que os indivíduos posaram as expressões faciais e outros em que expressaram naturalmente. Nas pesquisas em que almeja-se controlar a emoção do estímulo, podem ser utilizadas as imagens com expressão neutra que são disponibilizadas em todos os bancos aqui apresentados. Entretanto, os bancos que tiveram análise de juízes conferem uma segurança de que as imagens de fato apresentam expressão neutra.

Se o objetivo é testar a idade do estímulo, cabe analisar as faixas de idade de cada banco. Entre os bancos de crianças, a maior parte inclui indivíduos de idades muito diferentes e, considerando a variação de traços ao longo da infância, é interessante verificar a quantidade de estímulos da idade que se pretende utilizar. No caso dos bancos de adultos, alguns não possuem informações de idade, mas muitos englobam sujeitos jovens e idosos.

A respeito da padronização das imagens, seis bancos de adultos e apenas três bancos de crianças entre os aqui descritos apresentam algum tipo de padronização. Este aspecto é particularmente importante em pesquisas que demandam mais controle dos estímulos.

De modo geral, cabe destacar alguns bancos pela qualidade das imagens, quantidade de estímulos, por terem avaliação de juízes e algum tipo de padronização das imagens. Entre os bancos de crianças, ressaltamos o Child Affective Facial Expression – CAFE e o Child Neutral Expression Picture Set – CNEPS. Entre os bancos de adultos, destacam-se:

Cabe notar que o presente trabalho, pela própria natureza da proposta, foi desenvolvido a partir dos bancos existentes até a data de sua publicação e por isso, ao longo do tempo, a tendência é que muitas destas informações tenham de ser atualizadas. Por fim, esperamos que estes dados sejam úteis aos pesquisadores interessados e que motive mais investigações neste fascinante campo do estudo das faces.

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