Face Detection Data Set and Benchmark文章系列1 FDDB technical report review

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reference :FDDB: A Benchmark for Face Detection in Unconstrained Settings

最近对人脸检测方法进行调研，FDDB是由CMU与MIT共同维护的一个评价各种人脸检测算法的数据基准集。

先看官方介绍：

Welcome to the Face Detection Data Set and Benchmark (FDDB), a data set of face regions designed for studying the problem of unconstrained face detection. This data set contains the annotations for 5171 faces in a set of 2845 images taken from the Faces in the Wild data set. More details can be found in the technical report below.
关键词：unconstrained face detection, annotations for faces

标注方法：用椭圆ellipse代替矩形rectangle

详细看下数据标注的格式：

下载：http://vis-www.cs.umass.edu/fddb/FDDB-folds.tgz，可以看到：

FDDB-fold-01.txt:

2002/08/11/big/img_591
2002/08/26/big/img_265
2002/07/19/big/img_423
2002/08/24/big/img_490
2002/08/31/big/img_17676
2002/07/31/big/img_228
2002/07/24/big/img_402
2002/08/04/big/img_769
2002/07/19/big/img_581
2002/08/13/big/img_723
2002/08/12/big/img_821
2003/01/17/big/img_610
2002/08/13/big/img_1116
2002/08/28/big/img_19238

FDDB-fold-01-ellipseList.txt:

2002/08/11/big/img_591
1
123.583300 85.549500 1.265839 269.693400 161.781200 1
2002/08/26/big/img_265
3
67.363819 44.511485 -1.476417 105.249970 87.209036 1
41.936870 27.064477 1.471906 184.070915 129.345601 1
70.993052 43.355200 1.370217 340.894300 117.498951 1
2002/07/19/big/img_423
1
87.080955 59.379319 1.550861 255.383099 133.767857 1
2002/08/24/big/img_490
1
54.692105 35.056825 -1.384924 145.665694 78.101005 1
2002/08/31/big/img_17676
2
37.099961 29.000000 1.433107 28.453831 37.664572 1
79.589662 49.835046 -1.457361 112.514300 92.364284 1
2002/07/31/big/img_228
2
55.012198 33.056167 -1.540952 103.432230 107.856136 1
59.442926 36.625328 1.530747 295.300230 69.635719 1
2002/07/24/big/img_402
3
25.823639 19.002657 1.518290 347.991319 56.781250 1
79.154700 42.000000 -1.466077 120.500000 118.000000 1
16.065568 11.983094 1.520238 430.541176 58.189915 1
2002/08/04/big/img_769
2
102.467504 64.881072 -1.283213 86.723130 109.447408 1
88.826935 51.725088 -1.530065 244.468219 156.608952 1
2002/07/19/big/img_581
1
103.018162 70.017467 1.570796 155.093404 189.450662 1
2002/08/13/big/img_723

第一个文件名包含图像路径，第二个文件名包含图像路径，人脸位置信息，这是一种椭圆的标准格式。待续

下面重点介绍一下FDDB对人脸检测评价方法，根据官方PDF文档，人脸检测评价有几个方面的难度：

1.如何计算算法输出的人脸区域与标注区域的SCORE;

2.评价指标：这点倒无异议：ROC curves for TRUE POSITIVE RATE 待续

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