Fang Shaobo, Liu Chang, Zhu Fengqing, Boushey Carol, Delp Edward
School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA.
Cancer Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI, USA.
New Trends Image Anal Process ICIAP 2015 Workshops (2015). 2015 Sep;9281:358-365. doi: 10.1007/978-3-319-23222-5_44. Epub 2015 Aug 21.
In image based dietary assessment, color is a very important feature in food identification. One issue with using color in image analysis in the calibration of the color imaging capture system. In this paper we propose an indexing system for color camera calibration using printed color checkerboards also known as fiducial markers (FMs). To use the FM for color calibration one must know which printer was used to print the FM so that the correct color calibration matrix can be used for calibration. We have designed a printer indexing scheme that allows one to determine which printer was used to print the FM based on a unique arrangement of color squares and binarized marks (used for error control) printed on the FM. Using normalized cross correlation and pattern detection, the index corresponding to the printer for a particular FM can be determined. Our experimental results show this scheme is robust against most types of lighting conditions.
在基于图像的膳食评估中，颜色是食物识别的一个非常重要的特征。在颜色成像捕获系统的校准中，在图像分析中使用颜色存在一个问题。在本文中，我们提出了一种使用打印的颜色棋盘（也称为基准标记，FMs）进行彩色相机校准的索引系统。为了使用FM进行颜色校准，必须知道使用了哪台打印机来打印FM，以便可以使用正确的颜色校准矩阵进行校准。我们设计了一种打印机索引方案，该方案允许人们根据打印在FM上的颜色方块和二值化标记（用于错误控制）的独特排列来确定使用哪台打印机来打印FM。使用归一化互相关和模式检测，可以确定特定FM对应的打印机索引。我们的实验结果表明，该方案对大多数类型的光照条件具有鲁棒性。
