کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4635459 1340711 2007 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spherical harmonic based linear face de-lighting and compensation
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات ریاضیات کاربردی
پیش نمایش صفحه اول مقاله
Spherical harmonic based linear face de-lighting and compensation
چکیده انگلیسی
Lighting causes great variance for the objects. That makes the robust face detection a challenging problem. Although the spherical harmonic method provides a good framework for object rendering and inverse rendering, the requirement for the surface normal makes its application in face detection not practical. We propose a planar lighting model for the face images and give out a linear method to estimate the incident or reflected light field of the image based on the spherical harmonic bases. Given the ratio of new light field to the original one, the image can be converted to any new lighting conditions according to the reflection theory. We propose a linear de-lighting and compensation (LDC) method to adjust images. First, we convert the illumination of the image to its inverse condition and then compensate it with the original image, where the weight of compensation is determined by the normalized light field of the image. In the face detection experiment, the LDC method shows its ability to facilitate the performance of face detector.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Mathematics and Computation - Volume 185, Issue 2, 15 February 2007, Pages 857-868
نویسندگان
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