Portal de Periódicos da CAPES

Digital imaging colposcopy: corrected area measurements using shape-from-shading

1998; Institute of Electrical and Electronics Engineers; Volume: 17; Issue: 6 Linguagem: Inglês

10.1109/42.746633

1558-254X

Brian L. Craine, E. R. Craine, Cynthia J. O’Toole, Qiang Ji,

Breast Implant and Reconstruction

The quantitative measurement of areas on the cervix is of interest to researchers studying the natural history of human papilloma viral lesions. Measurement of areas from images obtained through a colposcope are, however, inherently in error due to the image being a two-dimensional projection of a three-dimensional object. The ability to correct for these errors through use of digital imaging colposcopy and a practical application of a shape from shading algorithm was developed in this study. The shape from shading technique requires empirical measurement of the relationship between observed light intensity and the viewing angle (referred to as a reflection map). It was found that a population mean reflection map provided a correction that was about as accurate as using an individual's own reflection map (making it unnecessary to measure a map for each exam). Digital red filtering of the images increased accuracy and precision of measurement.