diff --git a/doc/tutorials/videoio/intelperc.markdown b/doc/tutorials/videoio/intelperc.markdown
index 932d78bd10..4822c4146f 100644
--- a/doc/tutorials/videoio/intelperc.markdown
+++ b/doc/tutorials/videoio/intelperc.markdown
@@ -78,5 +78,5 @@ there are two flags that should be used to set/get property of the needed genera
     flag value is assumed by default if neither of the two possible values of the property is set.
 
 For more information please refer to the example of usage
-[intelperc_capture.cpp](https://github.com/opencv/opencv/tree/3.4/samples/cpp/intelperc_capture.cpp)
+[videocapture_intelperc.cpp](https://github.com/opencv/opencv/tree/3.4/samples/cpp/videocapture_intelperc.cpp)
 in opencv/samples/cpp folder.
diff --git a/doc/tutorials/videoio/kinect_openni.markdown b/doc/tutorials/videoio/kinect_openni.markdown
index e8b7ad5b08..32cc99533b 100644
--- a/doc/tutorials/videoio/kinect_openni.markdown
+++ b/doc/tutorials/videoio/kinect_openni.markdown
@@ -134,5 +134,5 @@ property. The following properties of cameras available through OpenNI interface
     -   CAP_OPENNI_DEPTH_GENERATOR_REGISTRATION = CAP_OPENNI_DEPTH_GENERATOR + CAP_PROP_OPENNI_REGISTRATION
 
 For more information please refer to the example of usage
-[openni_capture.cpp](https://github.com/opencv/opencv/tree/3.4/samples/cpp/openni_capture.cpp) in
+[videocapture_openni.cpp](https://github.com/opencv/opencv/tree/3.4/samples/cpp/videocapture_openni.cpp) in
 opencv/samples/cpp folder.
diff --git a/samples/cpp/starter_imagelist.cpp b/samples/cpp/imagelist_reader.cpp
similarity index 87%
rename from samples/cpp/starter_imagelist.cpp
rename to samples/cpp/imagelist_reader.cpp
index 6f4f71466c..1d209b93a7 100644
--- a/samples/cpp/starter_imagelist.cpp
+++ b/samples/cpp/imagelist_reader.cpp
@@ -1,6 +1,4 @@
 /*
- * starter_imagelist.cpp
- *
  *  Created on: Nov 23, 2010
  *      Author: Ethan Rublee
  *
@@ -16,10 +14,7 @@
 using namespace cv;
 using namespace std;
 
-//hide the local functions in an unnamed namespace
-namespace
-{
-void help(char** av)
+static void help(char** av)
 {
   cout << "\nThis program gets you started being able to read images from a list in a file\n"
           "Usage:\n./" << av[0] << " image_list.yaml\n"
@@ -30,7 +25,7 @@ void help(char** av)
         "Using OpenCV version %s\n" << CV_VERSION << "\n" << endl;
 }
 
-bool readStringList(const string& filename, vector<string>& l)
+static bool readStringList(const string& filename, vector<string>& l)
 {
   l.resize(0);
   FileStorage fs(filename, FileStorage::READ);
@@ -45,7 +40,7 @@ bool readStringList(const string& filename, vector<string>& l)
   return true;
 }
 
-int process(vector<string> images)
+static int process(const vector<string>& images)
 {
     namedWindow("image", WINDOW_KEEPRATIO); //resizable window;
     for (size_t i = 0; i < images.size(); i++)
@@ -53,13 +48,11 @@ int process(vector<string> images)
         Mat image = imread(images[i], IMREAD_GRAYSCALE); // do grayscale processing?
         imshow("image",image);
         cout << "Press a key to see the next image in the list." << endl;
-        waitKey(); // wait indefinitely for a key to be pressed
+        waitKey(); // wait infinitely for a key to be pressed
     }
     return 0;
 }
 
-}
-
 int main(int ac, char** av)
 {
   cv::CommandLineParser parser(ac, av, "{help h||}{@input||}");
diff --git a/samples/cpp/live_detect_qrcode.cpp b/samples/cpp/qrcode.cpp
similarity index 100%
rename from samples/cpp/live_detect_qrcode.cpp
rename to samples/cpp/qrcode.cpp
diff --git a/samples/cpp/autofocus.cpp b/samples/cpp/videocapture_gphoto2_autofocus.cpp
similarity index 100%
rename from samples/cpp/autofocus.cpp
rename to samples/cpp/videocapture_gphoto2_autofocus.cpp
diff --git a/samples/cpp/gstreamer_pipeline.cpp b/samples/cpp/videocapture_gstreamer_pipeline.cpp
similarity index 100%
rename from samples/cpp/gstreamer_pipeline.cpp
rename to samples/cpp/videocapture_gstreamer_pipeline.cpp
diff --git a/samples/cpp/image_sequence.cpp b/samples/cpp/videocapture_image_sequence.cpp
similarity index 100%
rename from samples/cpp/image_sequence.cpp
rename to samples/cpp/videocapture_image_sequence.cpp
diff --git a/samples/cpp/intelperc_capture.cpp b/samples/cpp/videocapture_intelperc.cpp
similarity index 99%
rename from samples/cpp/intelperc_capture.cpp
rename to samples/cpp/videocapture_intelperc.cpp
index b6e66745c4..7ac3a7c184 100644
--- a/samples/cpp/intelperc_capture.cpp
+++ b/samples/cpp/videocapture_intelperc.cpp
@@ -1,6 +1,3 @@
-// testOpenCVCam.cpp : Defines the entry point for the console application.
-//
-
 #include "opencv2/videoio.hpp"
 #include "opencv2/highgui.hpp"
 
diff --git a/samples/cpp/openni_capture.cpp b/samples/cpp/videocapture_openni.cpp
similarity index 100%
rename from samples/cpp/openni_capture.cpp
rename to samples/cpp/videocapture_openni.cpp