Add bib reference for overall hitrate and false alarm rate for the train cascade…

Add bib reference for overall hitrate and false alarm rate for the train cascade user guide (OpenCV 2.4).

doc/opencv.bib

@@ -316,6 +316,7 @@
 # '''[Teh89]''' C.H. Teh, R.T. Chin. On the Detection of Dominant Points on Digital Curves. - IEEE Tr. PAMI, 1989, v.11, No.8, p. 859-872.
 # '''[Trucco98]''' Emanuele Trucco, Alessandro Verri. Introductory Techniques for 3-D Computer Vision. Prentice Hall, Inc., 1998.
 # '''[Viola01]''' Paul Viola and Michael J. Jones. Rapid Object Detection using a Boosted Cascade of Simple Features. IEEE CVPR, 2001.<<BR>> The paper is available online at http://www.ai.mit.edu/people/viola/
+# '''[Viola04]''' Paul Viola and Michael J. Jones. Robust real-time face detection. International Journal of Computer Vision, 57(2):137–154, 2004.<<BR>> The paper is available online at http://www.vision.caltech.edu/html-files/EE148-2005-Spring/pprs/viola04ijcv.pdf
 # '''[Welch95]''' Greg Welch, Gary Bishop. An Introduction To the Kalman Filter. Technical Report TR95-041, University of North Carolina at Chapel Hill, 1995.<<BR>> Online version is available at http://www.cs.unc.edu/~welch/kalman/kalmanIntro.html
 # '''[Williams92]''' D. J. Williams and M. Shah. A Fast Algorithm for Active Contours and Curvature Estimation. CVGIP: Image Understanding, Vol. 55, No. 1, pp. 14-26, Jan., 1992. http://www.cs.ucf.edu/~vision/papers/shah/92/WIS92A.pdf.
 # '''[Yuen03]''' H.K. Yuen, J. Princen, J. Illingworth and J. Kittler. Comparative study of Hough Transform methods for circle finding.<<BR>>http://www.sciencedirect.com/science/article/B6V09-48TCV4N-5Y/2/91f551d124777f7a4cf7b18325235673

doc/user_guide/ug_traincascade.rst

@@ -326,11 +326,11 @@ Command line arguments of ``opencv_traincascade`` application grouped by purpose
 
     * ``-minHitRate <min_hit_rate>``
 
-        Minimal desired hit rate for each stage of the classifier. Overall hit rate may be estimated as (min_hit_rate^number_of_stages).
+        Minimal desired hit rate for each stage of the classifier. Overall hit rate may be estimated as (min_hit_rate ^ number_of_stages) [Viola2004]_.
 
     * ``-maxFalseAlarmRate <max_false_alarm_rate>``
 
-      Maximal desired false alarm rate for each stage of the classifier. Overall false alarm rate may be estimated as (max_false_alarm_rate^number_of_stages).
+      Maximal desired false alarm rate for each stage of the classifier. Overall false alarm rate may be estimated as (max_false_alarm_rate ^ number_of_stages) [Viola2004]_.
 
     * ``-weightTrimRate <weight_trim_rate>``
 
@@ -362,7 +362,9 @@ After the ``opencv_traincascade`` application has finished its work, the trained
 
 Training is finished and you can test you cascade classifier!
 
-.. [Viola2001] Paul Viola, Michael Jones. *Rapid Object Detection using a Boosted Cascade of Simple Features*. Conference on Computer Vision and Pattern Recognition (CVPR), 2001, pp. 511-518.
+.. [Viola2001] Paul Viola, Michael J. Jones. *Rapid Object Detection using a Boosted Cascade of Simple Features*. Conference on Computer Vision and Pattern Recognition (CVPR), 2001, pp. 511-518.
+
+.. [Viola2004] Paul Viola, Michael J. Jones. *Robust real-time face detection*. International Journal of Computer Vision, 57(2):137–154, 2004.
 
 .. [Rainer2002] Rainer Lienhart and Jochen Maydt. *An Extended Set of Haar-like Features for Rapid Object Detection*. Submitted to ICIP2002.