roiSelector.cpp
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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#include "precomp.hpp"
#include <opencv2/imgproc.hpp>
#include <algorithm>
using namespace cv;
namespace
{
class ROISelector
{
public:
Rect select(const String &windowName, Mat img, bool showCrossair = true, bool fromCenter = true)
{
// show notice to user
printf("Select a ROI and then press SPACE or ENTER button!\n");
printf("Cancel the selection process by pressing c button!\n");
key = 0;
imageSize = img.size();
// set the drawing mode
selectorParams.drawFromCenter = fromCenter;
// show the image and give feedback to user
imshow(windowName, img);
// copy the data, rectangle should be drawn in the fresh image
selectorParams.image = img.clone();
// select the object
setMouseCallback(windowName, mouseHandler, (void*)this);
// end selection process on SPACE (32) ESC (27) or ENTER (13)
while (!(key == 32 || key == 27 || key == 13))
{
// draw the selected object
rectangle(selectorParams.image, selectorParams.box, Scalar(255, 0, 0), 2, 1);
// draw cross air in the middle of bounding box
if (showCrossair)
{
// horizontal line
line(selectorParams.image,
Point((int)selectorParams.box.x,
(int)(selectorParams.box.y + selectorParams.box.height / 2)),
Point((int)(selectorParams.box.x + selectorParams.box.width),
(int)(selectorParams.box.y + selectorParams.box.height / 2)),
Scalar(255, 0, 0), 2, 1);
// vertical line
line(selectorParams.image,
Point((int)(selectorParams.box.x + selectorParams.box.width / 2),
(int)selectorParams.box.y),
Point((int)(selectorParams.box.x + selectorParams.box.width / 2),
(int)(selectorParams.box.y + selectorParams.box.height)),
Scalar(255, 0, 0), 2, 1);
}
// show the image bounding box
imshow(windowName, selectorParams.image);
// reset the image
selectorParams.image = img.clone();
// get keyboard event
key = waitKey(30);
if (key == 'c' || key == 'C')//cancel selection
{
selectorParams.box = Rect();
break;
}
}
//cleanup callback
setMouseCallback(windowName, emptyMouseHandler, NULL);
return selectorParams.box;
}
void select(const String &windowName, Mat img, std::vector<Rect> &boundingBoxes,
bool showCrosshair = true, bool fromCenter = true)
{
printf("Finish the selection process by pressing ESC button!\n");
boundingBoxes.clear();
key = 0;
// while key is not ESC (27)
for (;;)
{
Rect temp = select(windowName, img, showCrosshair, fromCenter);
if (key == 27)
break;
if (temp.width > 0 && temp.height > 0)
boundingBoxes.push_back(temp);
}
}
struct handlerT
{
// basic parameters
bool isDrawing;
Rect2d box;
Mat image;
Point2f startPos;
// parameters for drawing from the center
bool drawFromCenter;
// initializer list
handlerT() : isDrawing(false), drawFromCenter(true){};
} selectorParams;
private:
static void emptyMouseHandler(int, int, int, int, void*)
{
}
static void mouseHandler(int event, int x, int y, int flags, void *param)
{
ROISelector *self = static_cast<ROISelector *>(param);
self->opencv_mouse_callback(event, x, y, flags);
}
void opencv_mouse_callback(int event, int x, int y, int)
{
switch (event)
{
// update the selected bounding box
case EVENT_MOUSEMOVE:
if (selectorParams.isDrawing)
{
if (selectorParams.drawFromCenter)
{
// limit half extends to imageSize
float halfWidth = std::min(std::min(
std::abs(x - selectorParams.startPos.x),
selectorParams.startPos.x),
imageSize.width - selectorParams.startPos.x);
float halfHeight = std::min(std::min(
std::abs(y - selectorParams.startPos.y),
selectorParams.startPos.y),
imageSize.height - selectorParams.startPos.y);
selectorParams.box.width = halfWidth * 2;
selectorParams.box.height = halfHeight * 2;
selectorParams.box.x = selectorParams.startPos.x - halfWidth;
selectorParams.box.y = selectorParams.startPos.y - halfHeight;
}
else
{
// limit x and y to imageSize
int lx = std::min(std::max(x, 0), imageSize.width);
int by = std::min(std::max(y, 0), imageSize.height);
selectorParams.box.width = std::abs(lx - selectorParams.startPos.x);
selectorParams.box.height = std::abs(by - selectorParams.startPos.y);
selectorParams.box.x = std::min((float)lx, selectorParams.startPos.x);
selectorParams.box.y = std::min((float)by, selectorParams.startPos.y);
}
}
break;
// start to select the bounding box
case EVENT_LBUTTONDOWN:
selectorParams.isDrawing = true;
selectorParams.box = Rect2d(x, y, 0, 0);
selectorParams.startPos = Point2f((float)x, (float)y);
break;
// cleaning up the selected bounding box
case EVENT_LBUTTONUP:
selectorParams.isDrawing = false;
if (selectorParams.box.width < 0)
{
selectorParams.box.x += selectorParams.box.width;
selectorParams.box.width *= -1;
}
if (selectorParams.box.height < 0)
{
selectorParams.box.y += selectorParams.box.height;
selectorParams.box.height *= -1;
}
break;
}
}
// save the keypressed character
int key;
Size imageSize;
};
}
Rect cv::selectROI(InputArray img, bool showCrosshair, bool fromCenter)
{
ROISelector selector;
return selector.select("ROI selector", img.getMat(), showCrosshair, fromCenter);
}
Rect cv::selectROI(const String& windowName, InputArray img, bool showCrosshair, bool fromCenter)
{
ROISelector selector;
return selector.select(windowName, img.getMat(), showCrosshair, fromCenter);
}
void cv::selectROIs(const String& windowName, InputArray img,
std::vector<Rect>& boundingBox, bool showCrosshair, bool fromCenter)
{
ROISelector selector;
selector.select(windowName, img.getMat(), boundingBox, showCrosshair, fromCenter);
}