Turning a Digital Camera into an Absolute 2D Tele‐Colorimeter

Guarnera G. C.; Bianco S.; Schettini R.

摘要

Abstract > We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra. We validate the approach by comparing our estimated absolute tristimulus values (XYZ data in <mat:math display="inline" altimg="urn:x-wiley:01677055:media:cgf13393:cgf13393-math-0001" wiley:location="equation/cgf13393-math-0001.png"> <mat:mrow> <mat:mi>c</mat:mi> <mat:mi>d</mat:mi> <mat:mspace width="-0.16em"/> <mat:mo>/</mat:mo> <mat:mspace width="-0.16em"/> <mat:msup> <mat:mi>m</mat:mi> <mat:mn>2</mat:mn> </mat:msup> </mat:mrow> </mat:math> ) with the measurements of a professional 2D tele‐colorimeter, for a set of scenes with complex geometry, spatially varying reflectance and light sources with very different spectral power distribution. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”XML：lang =“en”> <title类型=“main”>抽象</ title> >我们呈现了一个简单有效的绝对比色相机表征技术，不变于曝光的变化/光圈和场景辐照度，适用于包括基于图像的图像的反射测量，光谱预滤波和频谱上采样，用于提高高动态范围成像中的颜色精度。我们的方法需要有限数量的采集，一个现成的目标和常用的投影仪，其用作可控制的光源，除了已知的反射光线之外。所表征的相机可以有效地用作2D Tele-Colorifeter，提供用户在场景中的亮度和色度分布的准确估计，而不需要明确了解入射照明功率谱。我们通过比较我们的估计绝对三刺激值（<mat：math display =“内联的”altimg =“urn：x-wiley：01677055：媒体：CGF13393：CGF13393-Math-0001”Wiley：Location =“等式/ CGF13393-Math-0001.PNG“> <MAT：MROW> <MAT：MI> C </ MAT：MI> <MAT：MI> D </ MAT：MI> <MAT：MSPACE WINDED =” - 0.16EM “/> <mat：mo> / </ mat：mo> <mat：mspace宽度=” - 0.16em“/> <may：msup> <mat：mi> m </ mat：mi> <mat：mn> 2 </ mat：mn> </ mat：msup> </ mat：mrow> </ mat：math>）随着专业的2d tele-coloriceter的测量，用于一组具有复杂几何形状的场景，空间不同的反射率和光源具有非常不同的光谱配电。 </ p> </ abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-16902/'>《Computer Graphics Forum: Journal of the European Association for Computer Graphics》</a> <b style="margin: 0 2px;">|</b><span>2019年第1期</span><b style="margin: 0 2px;">|</b><span>共14页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Guarnera G. C.&option=202" target="_blank" rel="nofollow">Guarnera G. C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bianco S.&option=202" target="_blank" rel="nofollow">Bianco S.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Schettini R.&option=202" target="_blank" rel="nofollow">Schettini R.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>NTNU ‐ Norwegian University of Science and TechnologyGj?vik Norway;</p> <p>University of Milano‐BicoccaMilano Italy;</p> <p>University of Milano‐BicoccaMilano Italy;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/7754.html" title="计算机的应用">计算机的应用;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=colour&option=203" rel="nofollow">colour;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=image and video processing&option=203" rel="nofollow">image and video processing;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=appearance modelling&option=203" rel="nofollow">appearance modelling;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=modelling&option=203" rel="nofollow">modelling;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=image‐based rendering&option=203" rel="nofollow">image‐based rendering;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rendering&option=203" rel="nofollow">rendering;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=I.3.3 Computer Graphics: Picture/Image Generation&option=203" rel="nofollow">I.3.3 Computer Graphics: Picture/Image Generation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=I.4.1 Image Processing and Computer Vision: Digitization and Image Capture&option=203" rel="nofollow">I.4.1 Image Processing and Computer Vision: Digitization and Image Capture;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=I.4.8 Image Processing and Computer Vision: Scene Analysis&option=203" rel="nofollow">I.4.8 Image Processing and Computer Vision: Scene Analysis;</a> </p> <div class="translation"> 机译：颜色;图像和视频处理;外观建模;建模;基于图像的渲染;渲染;I.3.3 [计算机图形]：图片/图像生成;I.4.1 [图像处理和计算机视觉]：数字化和图像捕获;一世。 4.8 [图像处理和计算机愿景]：场景分析; </div> </li> </ul> </div> </div> <div class="literature cardcommon" id="literaturereference" style="display:none"> <div class="similarity "> <h3 class="all_title" id="enpatent111">引文网络</h3> <div class="referencetab clearfix"> <ul id="referencedaohang"> <li dataid="referenceul">参考文献</li> <li dataid="citationul">引证文献</li> <li dataid="commonreferenceul">共引文献</li> <li dataid="commoncitationul">同被引文献</li> <li dataid="tworeferenceul">二级参考文献</li> <li dataid="twocitationul">二级引证文献</li> </ul> </div> <div class="reference_details" id="referenceList"> <ul id="referenceul"></ul> <ul id="citationul"></ul> <ul id="commonreferenceul"></ul> <ul id="commoncitationul"></ul> <ul id="tworeferenceul"></ul> <ul id="twocitationul"></ul> </div> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704022260683.html">Turning a Digital Camera into an Absolute 2D Tele‐Colorimeter</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Guarnera G. 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