4.28 How to transform an image by a dynamic color filter in OpenCV?
In the latest SOL9 libary, we have implmented OpenCVColorFilter class, and the following ImageTransformationByDynamicColorFilter
is an example to apply the filter to a cv::Mat image. In this example, the color filter can be controlled by three instance of ColorPositioner.
View
|
+-- Composite
|
+-- RowColumnT
| |
| +-- OpenCVColorFilter
|
+-- Positioner
|
+-- ColorPositioner
/*
* ImageTransformationByDynamicColorFilter.cpp
* Copyright (c) 2017 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED.
*/
//2017/10/01
// Simple image color transformer based on cv::transform API and ColorMatrix.
//
// See: http://docs.opencv.org/3.0-beta/modules/imgproc/doc/filtering.html
#define _CONSOLE_
#include <sol/ModuleFileName.h>
#include <sol/DropFiles.h>
#include <sol/ColorPositioner.h>
#include <sol/LabeledTrackBar.h>
#include <sol/FileDialog.h>
#include <sol/opencv/OpenCVApplicationView.h>
#include <sol/opencv/OpenCVScaleComboBox.h>
#include <sol/opencv/OpenCVScrolledImageView.h>
#include <sol/opencv/OpenCVColorFilter.h>
namespace SOL {
class MainView :public OpenCVApplicationView {
private:
////////////////////////////////////////////////////////////////////////////////////////
//Inner classes start.
class OriginalImageView :public OpenCVScrolledImageView {
private:
cv::Mat originalImage;
public:
OriginalImageView(View* parent, const char* name, Args& args)
:OpenCVScrolledImageView(parent, name, args)
{
try {
const char* filename = (const char*)args.get(XmNimageFileName);
int imageLoadingFlag = args.get(XmNimageLoadingFlag);
int scalingRatio = args.get(XmNimageScalingRatio);
loadImage(filename, imageLoadingFlag, scalingRatio);
} catch (SOL::Exception ex) {
caught(ex);
}
}
~OriginalImageView()
{
}
void loadImage(const char* filename, int imageLoadingFlag= CV_LOAD_IMAGE_COLOR, int scalingRatio=100)
{
try {
originalImage = readImage(filename, imageLoadingFlag);
setScaledImage(originalImage, scalingRatio);
} catch (Exception& ex) {
caught(ex);
}
}
void rescale(int scalingRatio)
{
setScaledImage(originalImage, scalingRatio);
}
};
class TransformedImageView :public OpenCVScrolledImageView {
private:
cv::Mat originalImage;
cv::Mat filteredImage;
public:
TransformedImageView(View* parent, const char* name, Args& args)
:OpenCVScrolledImageView(parent, name, args)
{
try {
const char* filename = (const char*)args.get(XmNimageFileName);
int imageLoadingFlag = args.get(XmNimageLoadingFlag);
int scalingRatio = args.get(XmNimageScalingRatio);
loadImage(filename, imageLoadingFlag, scalingRatio);
} catch (SOL::Exception ex) {
caught(ex);
}
}
~TransformedImageView()
{
}
void loadImage(const char* filename, int imageLoadingFlag= CV_LOAD_IMAGE_COLOR, int scalingRatio=100)
{
try {
originalImage = readImage(filename, imageLoadingFlag);
filteredImage = originalImage;
setScaledImage(filteredImage, scalingRatio);
} catch (Exception& ex) {
caught(ex);
}
}
void transform(cv::Mat& filter, int scalingRatio)
{
try {
cv::Mat newImage = originalImage.clone();
//Transform the original image using the color matrix(filter).
cv::transform(originalImage, newImage, filter);
filteredImage = newImage;
setScaledImage(filteredImage, scalingRatio);
refresh();
} catch (SOL::Exception& ex) {
caught(ex);
}
}
void rescale(int scalingRatio)
{
setScaledImage(filteredImage, scalingRatio);
}
};
//Inner classes end.
////////////////////////////////////////////////////////////////////////////////////////
StringT<char> imageFile;
SmartPtr<OriginalImageView> originalImage;
SmartPtr<TransformedImageView> filteredImage;
int imageScalingRatio;
SmartPtr<OpenCVScaleComboBox> scaleComboBox;
static const int COLORS = 3;
SmartPtr<OpenCVColorFilter> colorFilter;
static const int COLOR_CONTROLS = 3;
SmartPtr<ColorPositioner> colorPositioner[COLOR_CONTROLS];
FileDialog filedlg;
void updateCaption()
{
char caption[MAX_PATH];
sprintf_s(caption, CountOf(caption), "%s - %s",
(const char*)imageFile,
getAppName());
setText(caption);
}
void scaleChanged(Action& action)
{
imageScalingRatio = scaleComboBox->getScale();
originalImage -> rescale(imageScalingRatio);
filteredImage -> rescale(imageScalingRatio);
}
//Common colorPosition changed event handler for three colorPositioners.
virtual long colorPositionChanged(Event& event)
{
//Get an index for ColorPositioners array from the event parameter.
int index = event.getWParam();
ColorPositioner* positioner = (ColorPositioner*)event.getLParam();
if (index >= 0 && index <COLOR_CONTROLS && positioner) {
int r, g, b;
positioner -> getRGBColor(r, g, b);
colorFilter-> setValue(index, r, g, b);
}
cv::Mat& filter = colorFilter->getFilter();
filteredImage -> transform(filter, imageScalingRatio);
return 0;
}
void resize(int w, int h)
{
const int CPW = ColorPositioner::getDefaultWidth();
const int PH = ColorPositioner::getDefaultHeight();
if (originalImage && filteredImage && scaleComboBox) {
originalImage -> reshape(2, 2, (w-CPW)/2-1, h-4);
filteredImage -> reshape((w-CPW)/2+1, 2, (w-CPW)/2-1, h-4);
scaleComboBox -> reshape(w-CPW +10, 2, CPW-20, 40);
colorFilter -> reshape(w-CPW +10, 45, CPW-20, 110);
int y = 165;
for (int i = 0; i<COLOR_CONTROLS; i++) {
colorPositioner[i] -> reshape(w-CPW + 1, y+(PH+2)*i, CPW-2, PH);
}
}
}
void openFile(const char* filename)
{
try {
originalImage -> loadImage(filename);
filteredImage -> loadImage(filename);
const char* fname = strrchr(filename, '\\');
if (fname) {
fname++;
}
imageFile = fname;
originalImage -> rescale(imageScalingRatio);
cv::Mat& filter = colorFilter->getFilter();
filteredImage -> transform(filter, imageScalingRatio);
updateCaption();
} catch (Exception& ex) {
caught(ex);
}
}
void dropFiles(Action& action)
{
char fileName[MAX_PATH] = { 0 };
DropFiles drop((HDROP)action.getWParam());
int num = drop.queryFile(0, fileName, CountOf(fileName));
if(num > 0) {
if (filedlg.isImageFileName(fileName)) {
openFile(fileName);
bringUp();
} else {
bringUp(); //Activate and raise this view
showErrorDialog("Invalid image filename", fileName, MB_OK);
}
}
}
void confirm(Action& action)
{
int rc = MessageBox(NULL, "Are you sure to close this window?", "Confirmation",
MB_OKCANCEL|MB_ICONEXCLAMATION);
if (rc == IDOK) {
exit(action);
}
}
public:
MainView(OpenCVApplication& applet, const char* name, Args& args)
:OpenCVApplicationView(applet, name, args)
{
try {
imageScalingRatio = 60;
imageFile = "..\\images\\flower.png";
int imageLoadingFlag = CV_LOAD_IMAGE_COLOR;
Args ar;
ar.set(XmNimageFileName, imageFile);
ar.set(XmNimageLoadingFlag, imageLoadingFlag);
ar.set(XmNimageScalingRatio, imageScalingRatio);
originalImage = new OriginalImageView(this, "", ar);
originalImage -> addCallback(XmNdropCallback, this,
(Callback)&MainView::dropFiles, NULL);
ar.reset();
ar.set(XmNimageFileName, imageFile);
ar.set(XmNimageLoadingFlag, imageLoadingFlag);
ar.set(XmNimageScalingRatio, imageScalingRatio);
filteredImage = new TransformedImageView(this, "", ar);
const char* defaultScale = "60%";
imageScalingRatio = atoi(defaultScale);
ar.reset();
ar.set(XmNdefaultScale, defaultScale);
scaleComboBox = new OpenCVScaleComboBox(this, "Scale", ar);
scaleComboBox -> addCallback(XmNselChangeCallback, this,
(Callback)&MainView::scaleChanged, NULL);
ar.reset();
ar.set(XmNitemWidth, 60);
ar.set(XmNitemHeight, 28);
colorFilter = new OpenCVColorFilter(this, "ColorFilter", ar);
colorFilter->disable();
float r = 0.4 * 255.0f;
float g = 0.4 * 255.0f;
float b = 0.2 * 255.0f;
for (int i = 0; i<COLOR_CONTROLS; i++) {
ar.reset();
colorPositioner[i] = new ColorPositioner(this, "Color", ar);
colorPositioner[i]->setThumbPosition((int)r, (int)g, (int)b);
colorPositioner[i]->setId(i);
addEventHandler(colorPositioner[i]->getPositionChangedMessage(), this,
(Handler)&MainView::colorPositionChanged, NULL);
colorFilter -> setValue(i, (int)r, (int)g, (int)b);
}
addCallback(XmNmenuCallback, IDM_EXIT, this,
(Callback)&MainView::confirm, NULL);
cv::Mat& filter = colorFilter->getFilter();
filteredImage -> transform(filter, imageScalingRatio);
updateCaption();
ar.reset();
ar.set(XmNfilter, FileDialog::getImageFilesFilter());
filedlg.create(this, "OpenFile", ar);
} catch (Exception& ex) {
caught(ex);
}
}
~MainView()
{
}
void open(Action& action)
{
Args ar;
char dir[MAX_PATH] = { 0 };
if (restoreFileFolder(dir, CountOf(dir))) {
ar.set(XmNdirectory, dir);
filedlg.setValues(ar);
}
try {
if(filedlg.open()) {
const char* filename = filedlg.getFileName();
saveFileFolder(filename);
openFile(filename);
}
} catch (Exception& ex) {
caught(ex);
}
}
};
}
//
void main(int argc, char** argv)
{
try {
ModuleFileName module(argv[0]);
const char* name = module.getAppName();
OpenCVApplication applet(name, argc, argv);
Args args;
args.set(XmNwidth, 1000);
args.set(XmNheight, 600);
MainView view(applet, name, args);
view.realize();
applet.run();
} catch (SOL::Exception& ex) {
caught(ex);
}
}
Last modified: 8 Oct. 2017
Copyright (c) 2017 Antillia.com ALL RIGHTS RESERVED.