Correção no apontamento de imagens da sonda cassini

• Autor(a) principal: Figueira, Rodrigo Teixeira [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/157008; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-08-28/000906417.pdf
• topic: Análise de imagem; Planetas; Algoritmos; Image analysis

In this work we present an IDL algorithm that calculates the parameters for the pointing correntions applied to images of the rings of Saturn taken by the Cassini spacecraft. SPICE routines are used to calculate the pixels where some ring structure is located in the image, but they are not precise enough. The algorithm presented in this work verifies the difference between the SPICE data and the actual position of some known structure in the image. Once the structure is calibrated, all the other pixels will be shifted when subjected to the same correction factor. Through an IDL code we were able to identify the exact position of the Keeler gap center in the images after applying the Canny filter. The SPICE data were then shifted to the center of the Keeler gap and the camera pointing could be calibrated according to the correction factor. The method was efficient in the radial calibration of the Cassini images and it did not present a significant offset when compared with an alternative method of point position correction