From 31d5af7b92f9306b37ecb0dda0674bfb02fdb3e9 Mon Sep 17 00:00:00 2001
From: Gary Bradski <garybradski@gmail.com>
Date: Sat, 1 Jul 2017 04:36:43 +0000
Subject: [PATCH] finished adding headers and output to the program examples in
 ch2

---
 example_02-07.cpp | 16 ++++++++++++++++
 example_02-08.cpp | 20 +++++++++++++++++++-
 example_02-09.cpp | 19 +++++++++++++++++++
 example_02-10.cpp | 17 +++++++++++++++++
 example_02-11.cpp |  1 +
 example_08-02.cpp |  2 +-
 6 files changed, 73 insertions(+), 2 deletions(-)

diff --git a/example_02-07.cpp b/example_02-07.cpp
index 1000af5..e7f3a28 100644
--- a/example_02-07.cpp
+++ b/example_02-07.cpp
@@ -2,7 +2,23 @@
 // 2
 #include <opencv2/opencv.hpp>
 
+void help(char** argv ) {
+	std::cout << "\n"
+	<< "\nExample 2-7. The Canny edge detector writes its output to a single-channel (grayscale) image"
+    << "\nCall:\n"  
+	<< argv[0] <<" <path/image>\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_rgb, img_gry, img_cny;
 
diff --git a/example_02-08.cpp b/example_02-08.cpp
index 616cec3..a8fc46f 100644
--- a/example_02-08.cpp
+++ b/example_02-08.cpp
@@ -1,8 +1,26 @@
-// In Example 2-9, we show a simple way to read and write pixel values from Example 2-8.
+// Example 2-8. Combining the pyramid down operator (twice) and the Canny
+// subroutine in a simple image pipeline
 //2
 #include <opencv2/opencv.hpp>
 
+void help(char** argv ) {
+	std::cout << "\n"
+	<< "\nExample 2-8. Combining the pyramid down operator (twice) and the Canny"
+    << "\n             subroutine in a simple image pipeline"
+    << "\nCall:\n"  
+	<< argv[0] <<" <path/image>\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_rgb, img_gry, img_cny, img_pyr, img_pyr2;
 
diff --git a/example_02-09.cpp b/example_02-09.cpp
index d1d0e9d..0405754 100644
--- a/example_02-09.cpp
+++ b/example_02-09.cpp
@@ -1,6 +1,25 @@
+// Example 2-9. Getting and setting pixels in Example 2-8
+
 #include <opencv2/opencv.hpp>
 
+void help(char** argv ) {
+	std::cout << "\n"
+	<< "\nExample 2-9. Getting and setting pixels in Example 2-8"
+    << "\nCall:\n"  
+	<< argv[0] <<" <path/image>\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_rgb, img_gry, img_cny, img_pyr, img_pyr2;
 
diff --git a/example_02-10.cpp b/example_02-10.cpp
index 2fe8aea..77fc2b1 100644
--- a/example_02-10.cpp
+++ b/example_02-10.cpp
@@ -3,7 +3,24 @@
 #include <opencv2/opencv.hpp>
 #include <iostream>
 
+void help(char** argv ) {
+	std::cout << "\n"
+	<< "\nxample 2-10. The same object can load videos from a camera or a file"
+    << "\nCall:\n"  
+	<< argv[0] <<" [path/image]\n"
+	<< "\nor, read from camera:\n"
+	<< argv[0]
+	<< "\nFor example:\n"
+	<< argv[0] << " ../tree.avi\n"
+	<< std::endl;
+}
+	
+
 int main( int argc, char** argv ) {
+	
+	help(argv);
+
+
 
   cv::namedWindow( "Example 2-10", cv::WINDOW_AUTOSIZE );
   cv::VideoCapture cap;
diff --git a/example_02-11.cpp b/example_02-11.cpp
index dc7df2f..14416b7 100644
--- a/example_02-11.cpp
+++ b/example_02-11.cpp
@@ -11,6 +11,7 @@ void help(char** argv ) {
 	<< argv[0] <<" <path/video> <paht/video_output>\n"
 	<< "For example:\n"
 	<< argv[0] << " ../tree.avi ../vout.avi\n"
+	<< "\nThen read it with:\n ./example_02-10 ../vout.avi\n"
 	<< std::endl;
 }
 	
diff --git a/example_08-02.cpp b/example_08-02.cpp
index de51b9e..b7ce3bc 100644
--- a/example_08-02.cpp
+++ b/example_08-02.cpp
@@ -9,7 +9,7 @@ using namespace std;
 int main(int argc, char** argv) {
   
   cout << "\nExample 8-2. Using cv::FileStorage to create a .yml data file\n"
-      << argv[0] << endl 
+      << argv[0] << endl;
   
   cv::FileStorage fs("test.yml", cv::FileStorage::WRITE);