added headers

example_02-01.cpp

@@ -1,7 +1,24 @@
-//Include file for every supported OpenCV function
+//Example 2-1. A simple OpenCV program that loads an image from disk and displays it
+//on the screen
 #include <opencv2/opencv.hpp>
 
+void help(char** argv ) {
+	std::cout << "\n"
+	<< "A simple OpenCV program that loads and displays an image from disk\n"
+	<< argv[0] <<" <path/filename>\n"
+	<< "For example:\n"
+	<< argv[0] << " ../fruits.jpg\n"
+	<< std::endl;
+}
+
+
 int main( int argc, char** argv ) {
+
+	if (argc != 2) {
+		help(argv);
+		return 0;
+	}
+
 
   cv::Mat img = cv::imread( argv[1], -1 );
 

example_02-11.cpp

@@ -1,7 +1,27 @@
+// Example 2-11. A complete program to read in a color video and write out the log-polar-
+// transformed video
+
 #include <opencv2/opencv.hpp>
 #include <iostream>
 
-int main( int argc, char* argv[] ) {
+
+void help(char** argv ) {
+	std::cout << "\n"
+	<< "Read in a video, write out a log polar of it\n"
+	<< argv[0] <<" <path/video> <paht/video_output>\n"
+	<< "For example:\n"
+	<< argv[0] << " ../tree.avi ../vout.avi\n"
+	<< std::endl;
+}
+
+
+int main( int argc, char** argv ) {
+
+	if (argc != 3) {
+		help(argv);
+		return 0;
+	}
+
 
   cv::namedWindow( "Example 2-11", cv::WINDOW_AUTOSIZE );
   cv::namedWindow( "Log_Polar", cv::WINDOW_AUTOSIZE );