tenkeason's profile - activity

May i know is that posible if i want change the minimum size at line 279 in main.cpp, if posible what should i use here? can i use if(width>100 && height>150) replace with this code

if(area>MIN_OBJECT_AREA)

ok its works, thanks for help!

OK thanks.

if (minRect.width() > 100 && minRect.height() > 150) {rectangle( frame, minRect, Scalar( 0, 0, 255 ),2 );}

it got error there :expression preceding parentheses of apparent call must have (point-to-) function type

May i know if my minimum size is 100*150, how to change in the desiredValue?

May i know is that possible if we draw a rectangle at the front object show as below picture?

This is the Real Situation

This is what the robot will get from webcam when tracking the color

This what was i get now (draw a rectangles at biggest object)

This is what i want to do

int largestIndex = 0;
int largestContour = 0;
int secondLargestIndex = 0;
int secondLargestContour = 0;

vector<vector<Point> > contours;
vector<Vec4i> hierarchy;

//find contours
findContours(thresh, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE);

/// Find the convex hull object for each contour
vector<vector<Point> >hull(contours.size());
vector<vector<int> >inthull(contours.size());
vector<vector<Vec4i> >defects(contours.size());

for (int i = 0; i < contours.size(); i++)
{
    convexHull(Mat(contours[i]), hull[i], false);
    convexHull(Mat(contours[i]),inthull[i], false);
    if (inthull[i].size()>3)
    convexityDefects(contours[i], inthull[i], defects[i]);
}

//find 2 largest contour
for( int i = 0; i< contours.size(); i++ )
{
    if(contours[i].size() > largestContour)
    {
        secondLargestContour = largestContour;
        secondLargestIndex = largestIndex;
        largestContour = contours[i].size();
        largestIndex = i;
    }
    else if(contours[i].size() > secondLargestContour)
    {
        secondLargestContour = contours[i].size();
        secondLargestIndex = i;
    }
}
    //show contours of 2 biggest and hull as well
if(contours.size()>0)
    {
    //check for contouraea function if error occur
    //draw the 2 largest contour using previously stored index.
    //drawContours(frame, contours, largestIndex, CV_RGB(0,255,0), 2, 8, hierarchy);
    //drawContours(frame, contours, secondLargestIndex, CV_RGB(0,255,0), 2, 8, hierarchy);

    //draw rectangle at specified obstacle
    Rect minRect = boundingRect( Mat(contours[ largestIndex ]) );
    rectangle( frame, minRect, Scalar( 0, 0, 255 ),2 );
    minRect = boundingRect( Mat(contours[ secondLargestIndex ]) );
    rectangle( frame, minRect, Scalar( 0, 0, 255 ),2 );}

This code link : http://paste.ofcode.org/33beiUcpvTuPd...

ok now at "original image" window (right picture), it will only draw rectangles on 2 largest object(black color) was been detect. now i need add some function that is it will draw rectangle on object if only the object was largest than the minimum size (eg, 100*300)

May i know how to draw the rectangle at the object when the object is largest than the minimum size(left window picture), i already got to draw the rectangle when it was largest than the minimum size(right window picture) but i confused about this "Original Image" window(left window picture)

main.cpp : http://paste.ofcode.org/33beiUcpvTuPd...

Color.cpp : http://paste.ofcode.org/xbRhjeB3fnR2i...

Color.h : http://paste.ofcode.org/zeu4brWENxvtZ...

oh i see, thanks for reminding.

May i know what means the width and height aren't the same numbers used here?

this is my code, is that true?

http://paste.ofcode.org/w3cZgTE7kkyM9...

Sorry, i'm just start learn opencv few month and i still confuse about the code below. Would you help me explain about the below code please?

Rect minRect = boundingRect( Mat(contours[ largestIndex ]) );

This is i get just now, it will detect and draw rectangle at the 2 largest object, the problem now is it will draw a rectangle when the object is small than the size i want but is the first/second largest in the camera.

Requirement : It will draw rectangles at the 1st & 2nd largest object only if when the object largest than 200 * 300 (frame size : 640*480). If the 1st & 2nd object is small than the minimum size so it will not be draw.

may i know what should i write in condition if?

if ( what should i type here )

{

112 ... 132 line

}

The codes are in below link

main,cpp : http://paste.ofcode.org/36TG5U8WTViFN...

Color.h : http://paste.ofcode.org/WDy2xPwYnaZxL...

Color.cpp : http://paste.ofcode.org/c4yeiyC2tv2t8...

may i know what should i write in condition if?

if ( what should i type here )

{

112 ... 132

}