دانلود مقاله ISI انگلیسی شماره 58035
عنوان فارسی مقاله

یک وسیله عملی برای اندازه گیری و کالیبراسیون سیستم های استریو فتومتریک مبتنی بر LED

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
58035 2015 9 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
A practical means for calibrating an LED-based photometric stereo system
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Optics and Lasers in Engineering, Volume 64, January 2015, Pages 42–50

کلمات کلیدی
استریو فوتومتریک؛ روشنایی میدان نزدیک؛ کالیبراسیون نورپردازی؛ بازسازی 3D
پیش نمایش مقاله
پیش نمایش مقاله یک وسیله عملی برای اندازه گیری و کالیبراسیون سیستم های استریو فتومتریک مبتنی بر LED

چکیده انگلیسی

Conventional Photometric Stereo (PS) techniques are usually based on the assumption that the light sources are assumed sufficiently far from the object that all incoming light can be modeled using parallel rays. Meanwhile, for near-field lighting conditions the light sources are close to the object so the parallel ray model cannot be used. To determine the surface normal for each point on the object more accurately, the incoming light direction should be calculated individually for each point. In this work, based on a simple PS setup consisting of LED lamps and one camera, we present a practical method for calibrating lighting directions. First, an optical model of an LED was introduced in the calibration procedure to represent the surface irradiance and image irradiance more accurately. A reference sphere was used for the calibration so that the LED optical axis could be estimated by extracting the specular points from the reference sphere. By introducing the LED emitting model, distance between the LED and the specular point along the optical axis can be calculated. Thus, the incident lighting directions for various image points can be estimated individually. To improve the estimation robustness, a non-linear fitting approach was also applied. Experiments were conducted using objects and the results are compared with traditional methods to demonstrate its feasibility and improvement.

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