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Add Java and Python code for trackbar tutorial.

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This commit is contained in:
catree
2018-05-17 14:19:08 +02:00
parent ba6b9fd261
commit 9fc0cabdf5
7 changed files with 258 additions and 25 deletions
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samples/cpp/tutorial_code/HighGUI/AddingImagesTrackbar.cpp
+4 -6
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@@ -6,9 +6,10 @@
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include <stdio.h>
#include <iostream>
using namespace cv;
using std::cout;
/** Global Variables */
const int alpha_slider_max = 100;
@@ -29,11 +30,8 @@ Mat dst;
static void on_trackbar( int, void* )
{
alpha = (double) alpha_slider/alpha_slider_max ;
beta = ( 1.0 - alpha );
addWeighted( src1, alpha, src2, beta, 0.0, dst);
imshow( "Linear Blend", dst );
}
//![on_trackbar]
@@ -50,8 +48,8 @@ int main( void )
src2 = imread("../data/WindowsLogo.jpg");
//![load]
if( src1.empty() ) { printf("Error loading src1 \n"); return -1; }
if( src2.empty() ) { printf("Error loading src2 \n"); return -1; }
if( src1.empty() ) { cout << "Error loading src1 \n"; return -1; }
if( src2.empty() ) { cout << "Error loading src2 \n"; return -1; }
/// Initialize values
alpha_slider = 0;
samples/java/tutorial_code/ImgProc/erosion_dilatation/MorphologyDemo1.java
+6 -2
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@@ -25,7 +25,7 @@ import org.opencv.imgproc.Imgproc;
public class MorphologyDemo1 {
private static final String[] ELEMENT_TYPE = { "Rectangle", "Cross", "Ellipse" };
private static final String[] MORPH_OP = { "Erosion", "Dilatation" };
private static int maxKernelSize = 21;
private static final int MAX_KERNEL_SIZE = 21;
private Mat matImgSrc;
private Mat matImgDst = new Mat();
private int elementType = Imgproc.CV_SHAPE_RECT;
@@ -83,7 +83,11 @@ public class MorphologyDemo1 {
sliderPanel.add(elementTypeBox);
sliderPanel.add(new JLabel("Kernel size: 2n + 1"));
JSlider slider = new JSlider(0, maxKernelSize, 0);
JSlider slider = new JSlider(0, MAX_KERNEL_SIZE, 0);
slider.setMajorTickSpacing(5);
slider.setMinorTickSpacing(5);
slider.setPaintTicks(true);
slider.setPaintLabels(true);
slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
samples/java/tutorial_code/ImgProc/opening_closing_hats/MorphologyDemo2.java
+6 -2
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@@ -27,7 +27,7 @@ public class MorphologyDemo2 {
private static final int[] MORPH_OP_TYPE = { Imgproc.MORPH_OPEN, Imgproc.MORPH_CLOSE,
Imgproc.MORPH_GRADIENT, Imgproc.MORPH_TOPHAT, Imgproc.MORPH_BLACKHAT };
private static final String[] ELEMENT_TYPE = { "Rectangle", "Cross", "Ellipse" };
private static int maxKernelSize = 21;
private static final int MAX_KERNEL_SIZE = 21;
private Mat matImgSrc;
private Mat matImgDst = new Mat();
private int morphOpType = Imgproc.MORPH_OPEN;
@@ -97,7 +97,11 @@ public class MorphologyDemo2 {
sliderPanel.add(elementTypeBox);
sliderPanel.add(new JLabel("Kernel size: 2n + 1"));
JSlider slider = new JSlider(0, maxKernelSize, 0);
JSlider slider = new JSlider(0, MAX_KERNEL_SIZE, 0);
slider.setMajorTickSpacing(5);
slider.setMinorTickSpacing(5);
slider.setPaintTicks(true);
slider.setPaintLabels(true);
slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
samples/java/tutorial_code/highgui/trackbar/AddingImagesTrackbar.java
+119
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@@ -0,0 +1,119 @@
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Image;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
public class AddingImagesTrackbar {
private static final int ALPHA_SLIDER_MAX = 100;
private int alphaVal = 0;
private Mat matImgSrc1;
private Mat matImgSrc2;
private Mat matImgDst = new Mat();
private JFrame frame;
private JLabel imgLabel;
public AddingImagesTrackbar(String[] args) {
//! [load]
String imagePath1 = "../data/LinuxLogo.jpg";
String imagePath2 = "../data/WindowsLogo.jpg";
if (args.length > 1) {
imagePath1 = args[0];
imagePath2 = args[1];
}
matImgSrc1 = Imgcodecs.imread(imagePath1);
matImgSrc2 = Imgcodecs.imread(imagePath2);
//! [load]
if (matImgSrc1.empty()) {
System.out.println("Empty image: " + imagePath1);
System.exit(0);
}
if (matImgSrc2.empty()) {
System.out.println("Empty image: " + imagePath2);
System.exit(0);
}
//! [window]
// Create and set up the window.
frame = new JFrame("Linear Blend");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Set up the content pane.
Image img = HighGui.toBufferedImage(matImgSrc2);
addComponentsToPane(frame.getContentPane(), img);
// Use the content pane's default BorderLayout. No need for
// setLayout(new BorderLayout());
// Display the window.
frame.pack();
frame.setVisible(true);
//! [window]
}
private void addComponentsToPane(Container pane, Image img) {
if (!(pane.getLayout() instanceof BorderLayout)) {
pane.add(new JLabel("Container doesn't use BorderLayout!"));
return;
}
JPanel sliderPanel = new JPanel();
sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.PAGE_AXIS));
//! [create_trackbar]
sliderPanel.add(new JLabel(String.format("Alpha x %d", ALPHA_SLIDER_MAX)));
JSlider slider = new JSlider(0, ALPHA_SLIDER_MAX, 0);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
slider.setPaintTicks(true);
slider.setPaintLabels(true);
//! [create_trackbar]
//! [on_trackbar]
slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
JSlider source = (JSlider) e.getSource();
alphaVal = source.getValue();
update();
}
});
//! [on_trackbar]
sliderPanel.add(slider);
pane.add(sliderPanel, BorderLayout.PAGE_START);
imgLabel = new JLabel(new ImageIcon(img));
pane.add(imgLabel, BorderLayout.CENTER);
}
private void update() {
double alpha = alphaVal / (double) ALPHA_SLIDER_MAX;
double beta = 1.0 - alpha;
Core.addWeighted(matImgSrc1, alpha, matImgSrc2, beta, 0, matImgDst);
Image img = HighGui.toBufferedImage(matImgDst);
imgLabel.setIcon(new ImageIcon(img));
frame.repaint();
}
public static void main(String[] args) {
// Load the native OpenCV library
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
// Schedule a job for the event dispatch thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new AddingImagesTrackbar(args);
}
});
}
}
samples/python/tutorial_code/highgui/trackbar/AddingImagesTrackbar.py
+48
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@@ -0,0 +1,48 @@
from __future__ import print_function
from __future__ import division
import cv2 as cv
import argparse
alpha_slider_max = 100
title_window = 'Linear Blend'
## [on_trackbar]
def on_trackbar(val):
alpha = val / alpha_slider_max
beta = ( 1.0 - alpha )
dst = cv.addWeighted(src1, alpha, src2, beta, 0.0)
cv.imshow(title_window, dst)
## [on_trackbar]
parser = argparse.ArgumentParser(description='Code for Adding a Trackbar to our applications tutorial.')
parser.add_argument('--input1', help='Path to the first input image.', default='../data/LinuxLogo.jpg')
parser.add_argument('--input2', help='Path to the second input image.', default='../data/WindowsLogo.jpg')
args = parser.parse_args()
## [load]
# Read images ( both have to be of the same size and type )
src1 = cv.imread(args.input1)
src2 = cv.imread(args.input2)
## [load]
if src1 is None:
print('Could not open or find the image: ', args.input1)
exit(0)
if src2 is None:
print('Could not open or find the image: ', args.input2)
exit(0)
## [window]
cv.namedWindow(title_window)
## [window]
## [create_trackbar]
trackbar_name = 'Alpha x %d' % alpha_slider_max
cv.createTrackbar(trackbar_name, title_window , 0, alpha_slider_max, on_trackbar)
## [create_trackbar]
# Show some stuff
on_trackbar(0)
# Wait until user press some key
cv.waitKey()