Friday, April 3rd, 2009, 1513 days ago
Color recognition using openCV 2
Related Post: Color recognition using openCV
Recognising colors in computer vision using openCV is not so complicated as it is expected. Actually, getting the capture image from webcam or some other advanced cameras, converting the color from RGB to HSV or HSI( not sure it is right ), and extracting the specific color(s) from the converted image, that is done. After that, some filters like CVSMOOTH, CANNY and CVTHRESHOLD can be applied to take off the noises in the previous image.
Give some codes here :
IplImage* src = cvCreateImage( sz, 8, 3 );
IplImage* hsv_image = cvCreateImage( sz, 8, 3);
IplImage* hsv_mask = cvCreateImage( sz, 8, 1);
IplImage* hsv_edge = cvCreateImage( sz, 8, 1);
CvScalar hsv_min = cvScalar(0, 80, 80, 0);
CvScalar hsv_max = cvScalar(20, 150, 255, 0);
/*——————————————*/src = cvQueryFrame( capture);
cvCvtColor(src, hsv_image, CV_BGR2HSV);
cvInRangeS (hsv_image, hsv_min, hsv_max, hsv_mask);
cvSmooth( hsv_mask, hsv_mask, CV_MEDIAN, 13, 0, 0, 0 );
cvCanny(hsv_mask, hsv_edge, 1, 3, 5);
POSTS MAY BE OF INTEREST
Doing openCV in pandaboard 3 – s...- Doing openCV in Pandaboard
- Hand gesture recognition for HCI
- Hand detection and image recognition
Coming soon: A review of openCV detect...- Pattern recognition and applications
Object tracking using AS3- Interactive table
- Touchable holography
- About the codes sharing
- Usability of comsumer electronic produ...
- Rules of memory management of openCV
Hi
I have a problem with recognize color. Please send me all code. Thanks for HELP.
you can refer here: http://img.andol.info/2009/02/colorrecg.pdf
hi,i am so happy to find your blog,there are so many code and method which are just what i want.Thank you for your sharing ! One problem is i conld not download the source code ,could you solve it or tell me why!Waiting for your reply!
hi,ur code was very useful for me ,i need to know the position of this object
for(int i = 1;i < sz.height; i++)
{
for(int j = 1;j <sz.width; j++)
{
if (cvGet2D(hsv_mask,i-1,j).val==s.val &&cvGet2D(hsv_mask,i,j).val==s.val&&cvGet2D(hsv_mask,i+1,j).val&&cvGet2D(hsv_mask,i,j-1).val==s.val&&cvGet2D(hsv_mask,i,j).val==s.val&&cvGet2D(hsv_mask,i,j+1).val)
{
select_object=1;
selection.width=30;
selection.height=30;
selection.x=i;
selection.y=j;
}
i trying this code but it fails
hi Andol, i find that this program is very useful for the people who want to start with opencv, but i wonder that if the code in pdf file is full, i debug it, but there is nothing happen, would you mind if i ask you to tell me the way to run this program. I’m a new comer with opencv. For example: which lib we have to add to input to the input (linker) in the project properties… I’ve added the lib from Opencv to C++.(include, Lib already)
thanks a lot for your help!!!
It is the full code, but, some parameters such like the source image and target colour detection need to be adjusted due to different application environments. Have another try, might work with different parameters.
oh, i use Opencv 1.1 with VS C++ 2008.
thank you for your time^^.
Thank you bvoang.
thank you so much Andol, it was my honour when you replied to me when i’ve just asked, actually, i’m taking a thesis with opencv, but i don’t really know much about iit, i am trying to recognise the basic color as you told, but i don’t really know what to do at first in the code, could you help me with the way to solve the problem. i mean the algorithms.
thank you for your time.
newby : Thanks a lot for this site (and codes/ideas)
thank you very much
it very useful
[...] numerous other monster beats by dr. dre pro studio price methods already issue they're also . hi – d beats by dre oscar de la renta mementos towel beats by dre in soho high tech a person monster beats soho always remember obligation [...]
Hi,
Can you upload the code again? It seems that it has been deleted from the previous server.
Thanks in advanced
@Pamela
thank you for your interests
the source code can be found in http://www.andol.info/hci/774.htm
Hi Mr Andol.
Thx for your opencv tutorial. I want to ask your permission to use your code for my school project.
And I want to ask you, i want to tracking white line. In this site http://www.aishack.in/2010/07/tracking-colored-objects-in-opencv/ the author can detect the yellow color..
How can i track the white color for the line?
@Ardy
yes the codes are open for in-commercial use – you can use it freely in your project
generally tracking a white line is similar like tracking a yellow ball, you need to filter, threshold and split the images to highlight the position of your target. You can get the range of colour you want, and using this range to filter out the white line you want.
By detecting the line, you may/ or not / need the function houghline.
cheers
Trims Mr Andol for fast reply.
Actually i am new with opencv. My plan to combine your code for detect rect and estimation angle with white color. For estimation angle, can you tellme how it works. For example, rect object on wall. By use the webcam, i can detect how degre / the gradient from my webcam to that object..
Hope you can answer sir,.