PLOS ONE2014-01-12 10:26 PM

Identifiable Images of Bystanders Extracted from Corneal Reflections 通过角膜反射识别照片中的第三者

Abstract
Criminal investigations often use photographic evidence to identify suspects. Here we combined robust face perception and high-resolution photography to mine face photographs for hidden information. By zooming in on high-resolution face photographs, we were able to recover images of unseen bystanders from reflections in the subjects' eyes. To establish whether these bystanders could be identified from the reflection images, we presented them as stimuli in a face matching task (Experiment 1). Accuracy in the face matching task was well above chance (50%), despite the unpromising source of the stimuli. Participants who were unfamiliar with the bystanders' faces (n = 16) performed at 71% accuracy [t(15) = 7.64, p<.0001, d = 1.91], and participants who were familiar with the faces (n = 16) performed at 84% accuracy [t(15) = 11.15, p<.0001, d = 2.79]. In a test of spontaneous recognition (Experiment 2), observers could reliably name a familiar face from an eye reflection image. For crimes in which the victims are photographed (e.g., hostage taking, child sex abuse), reflections in the eyes of the photographic subject could help to identify perpetrators. 论文摘要 犯罪调查通常使用的是图片证据来鉴别嫌疑人。现在我们通过结合强大的人脸识别和高分辨率图像,来挖掘脸部图片中不易被察觉的信息。通过对高分辨率人脸图片的放大,我们可以从照片中人物的眼球的部分还原图片信息来找到图片中不存在的第三者。为了建立通过还原图片而来的第三者是否可以被识别,我们建立了一个人脸匹配识别的实验(实验1)除去完全没有希望通过测试来识别的匹配,事实上人脸匹配的准确性上大约是超过50%。如果参与者并不熟悉第三者的样子(n = 16)大约是为71%的准确性[t(15) = 7.64, p<.0001, d = 1.91],但如果当参与者熟悉第三者的脸型的时候(n = 16) 其准确性高达84%[t(15) = 11.15, p<.0001, d = 2.79]。在自发性识别指认的测试中(实验2),观察者可以从通过眼球反射还原的图片中很确定地指出熟悉的人的脸。在一些通常受害者会被拍摄下来的罪犯行为中(如人质劫持,儿童性虐待),可以通过被受害人照片中眼球的反射来识别犯罪人的面部特征。

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