speed up 2x to 3x & parallelization is disabled

The algorithm has been speeded up 2x to 3x. Multi-core parallelization
is disabled.

ChangeLog

@@ -1,4 +1,10 @@
+2016-10-6
+---------------------
+* The algorithm has been speeded up greatly (2x to 3x). 
+* Multi-core parallelization has been disabled. The detection time is still the same.
+
 2016-9-16
+---------------------
 * Speedup again.
 * Change function name facedetect_frontal_tmp() to facedetect_frontal_surveillance(). This function now uses a new trained classifier which can achieve a higher detection speed.
 

README.md

@@ -1,51 +1,35 @@
-libfacedetection
-====================
+# libfacedetection
 
 This is a binary library for face detection in images. 
 The 32-bit and 64-bit dll files are provided.
-
+To achieve better performance, the 64-bit dll is recommended.
 
 examples/libfacedetect-example.cpp shows how to use the library.
 
 Comparison on Windows
 -------------
 
-| Method | Time   | FPS  | Misc   |
-|--------|--------|------|--------|
-|OpenCV  | 21.2ms | 47.2 | Yaw angle: -40 to 40 degrees. Classifier: haarcascade_frontalface_alt.xml |
-|frontal |  2.7ms | 370.4 | Yaw angle: -60 to 60 degrees|
-|frontal-surveillance|  3.8ms | 263.2 | Yaw angle: -70 to 70 degrees |
-|multiview|  6.6ms | 151.5 | Yaw angle: -90 to 90 degrees |
-|multiview_reinforce|  9.5ms | 105.3 | Yaw angle: -90 to 90 degrees |
+| Method             | Time(Win32) | FPS(Win32) |Time(X64)   | FPS(X64)  | Misc   |
+|--------------------|-------------|------------|------------|-----------|--------|
+|frontal             |  2.92ms     | 342.5      | 2.41ms     | 414.9     | Yaw angle: -60 to 60 degrees|
+|frontal-surveillance|  3.83ms     | 261.1      | 3.37ms     | 269.7     | Yaw angle: -70 to 70 degrees |
+|multiview           |  7.12ms     | 140.4      | 5.81ms     | 172.1     | Yaw angle: -90 to 90 degrees |
+|multiview_reinforce | 10.95ms     |  91.3      | 9.15ms     | 109.3     | Yaw angle: -90 to 90 degrees |
 
 * 640x480 image size (VGA), scale=1.2, minimal window size = 48
 * Intel(R) Core(TM) i7-4770 CPU @ 3.4GHz
-* Multi-core parallelization is enabled for these five methods.
-
-Comparison on iPhone(+)
--------------
-
-| Method | Time (iPhoneSE)   | FPS (iPhoneSE) | Time (iPhone5S) | FPS (iPhone5S) | Misc   |
-|--------|--------|------|--------|------|--------|
-|frontal |  14.9ms | 67.1 | 23.8 | 42.0 | Yaw angle: -60 to 60 degrees|
-|multiview|  47.3ms | 21.1 | 75.1 | 13.3 |Yaw angle: -90 to 90 degrees |
-|multiview_reinforce|  83.2ms | 12.0 | 132.4 | 7.6 | Yaw angle: -90 to 90 degrees |
-
-* 640x480 image size (VGA), scale=1.2, minimal window size = 48
-* Multi-core parallelization is disabled.
-* C programming language, and no SIMD instruction is used.
-* (+) The performance data on iPhone was obtained using a previous version. Currrent version can gain ~40% speed improvement.
+* Only one CPU core is utilized. Multi-core parallelization is *disabled* for these four methods.
 
 
 Comparison on ARM
 -------------
 
-| Method | Time   | FPS  | Misc   |
-|--------|--------|------|--------|
-|frontal |  21.5ms | 46.5 | Yaw angle: -60 to 60 degrees|
-|frontal-surveillance|  36.5ms | 27.4 | Yaw angle: -70 to 70 degrees |
-|multiview|  67.1ms | 14.9 | Yaw angle: -90 to 90 degrees |
-|multiview_reinforce|  112.6ms | 8.9 | Yaw angle: -90 to 90 degrees |
+| Method             | Time   | FPS  | Misc   |
+|--------------------|--------|------|--------|
+|frontal             |  12.5ms| 46.5 | Yaw angle: -60 to 60 degrees|
+|frontal-surveillance|  15.7ms| 27.4 | Yaw angle: -70 to 70 degrees |
+|multiview           |  27.8ms| 14.9 | Yaw angle: -90 to 90 degrees |
+|multiview_reinforce |  38.4ms|  8.9 | Yaw angle: -90 to 90 degrees |
 
 * 640x480 image size (VGA), scale=1.2, minimal window size = 48
 * NVIDIA TK1 "4-Plus-1" 2.32GHz ARM quad-core Cortex-A15 CPU
@@ -58,7 +42,7 @@ Evaluation
 -------------
 FDDB: http://vis-www.cs.umass.edu/fddb/index.html
 
-![Evaluation on FDDB](https://github.com/ShiqiYu/libfacedetection/blob/master/FDDB-results-of-3functions.png "Evaluation on FDDB")
+![Evaluation on FDDB](https://github.com/ShiqiYu/libfacedetection/blob/master/FDDB-results-of-4functions.png "Evaluation on FDDB")
 
 * scale=1.08
 * minimal window size = 16

example/libfacedetect-example.cpp

@@ -26,8 +26,8 @@ SOFTWARE.
 #include <opencv.hpp>
 
 #include "facedetect-dll.h"
-#pragma comment(lib,"libfacedetect.lib")
-//#pragma comment(lib,"libfacedetect-x64.lib")
+//#pragma comment(lib,"libfacedetect.lib")
+#pragma comment(lib,"libfacedetect-x64.lib")
 
 using namespace cv;