Berani

How can I extract the values of cv.jit.features?

I need to output the locations of the features marked with the red crosses in my display window.

How can I extract the values of cv.jit.features?
I need to output the locations of the features marked with the red crosses in my display window.


cv-jit-features-getting-the-values-of-the-feature-coordinates

I'm not at my computer right now, but I believe I use a combination of

jit.unpack and jit.iter. Again, going it blind with that, but that should

> How can I extract the values of cv.jit.features?

> I need to output the locations of the features marked with the red crosses

I'm not at my computer right now, but I believe I use a combination of
jit.unpack and jit.iter.  Again, going it blind with that, but that should
work.

On 10/18/06, Bart  wrote:
>
>
> How can I extract the values of cv.jit.features?
> I need to output the locations of the features marked with the red crosses
> in my display window.
>

this extract bounds and centroid, sorted. anything else can be added

make sure to apply forth !funky! ball after compiling the js as it responds

//the first memeber of the cvBlobsCentroids array is

//only so you see that it is sorted, you should delete it, same for bounds

cvBlobsCentroids[cvSort[a[0]]]=[a[0],a[1],a[2],a[3]];

cvBlobsBounds[cvSort[z[0]]]=[z[0],z[1],z[2],z[3],z[4]];

//recive packed and swaped sort to label matrix iteration

{//only sort on jit.change or cvSort.length change,

//copy cv.blob.Sort array and numricly sort it.

> I'm not at my computer right now, but I believe I use a combination of

> jit.unpack and jit.iter. Again, going it blind with that, but that should

> > How can I extract the values of cv.jit.features?

> > I need to output the locations of the features marked with the red

my days work..
this extract bounds and centroid, sorted. anything else can be added
make sure to apply forth !funky! ball after compiling the js as it responds
to change.

\save as router7.js\
autowatch=1;
outlets=3;
post("n__compiled__nnnnnnnnnnnn");
//store sorted labels and output
var cvBlobsCentroids=new Array();
var cvBlobsBounds=new Array();
var cvSort=new Array();
var outOrder=new Array();
var changed=1;
var blobNum=0;
//
function centroid(){
    var a = arrayfromargs(arguments);
    //the first memeber of the cvBlobsCentroids array is
//only so you see that it is sorted, you should delete it, same for bounds
    cvBlobsCentroids[cvSort[a[0]]]=[a[0],a[1],a[2],a[3]];
}
//
function bounds(){
    var z = arrayfromargs(arguments);
    cvBlobsBounds[cvSort[z[0]]]=[z[0],z[1],z[2],z[3],z[4]];
}
//recive packed and swaped sort to label matrix iteration
function sort()
{    //create an funbuff array
    var v = arrayfromargs(arguments);
    cvSort.length=blobNum;
    outOrder.length=blobNum;
    cvSort[v[0]]=v[1];
}

function bang(){
    outlet(2,blobNum);
    if(changed)
    {//only sort on jit.change or cvSort.length change,
//copy cv.blob.Sort array and numricly sort it.
    outOrder=cvSort.join();
    outOrder=outOrder.split(",");
    outOrder.sort()
    changed=0;
    }
    for(i=0;i
        outlet(0,cvBlobsCentroids[outOrder[i]]);
        outlet(1,cvBlobsBounds[outOrder[i]]);
    }
}

2006/10/18, keith manlove :
>
> I'm not at my computer right now, but I believe I use a combination of
> jit.unpack and jit.iter.  Again, going it blind with that, but that should
> work.
>
> Keith
>
>
> On 10/18/06, Bart  wrote:
> >
> >
> > How can I extract the values of cv.jit.features?
> > I need to output the locations of the features marked with the red
> > crosses in my display window.
> >
>
>
>
>
>

Thanks for your replies. I'm just a noob here. Your patch will take me days to understand Yair :)

I am able to extract the coordinates of jit.features now thanks to you Keith.

Let's say I want to save the coordinates of all the feature points of one object once (feature point 1 to the last one taken from a still image?) Later I want to compare the feature points of a new object in my camera view to the saved ones.

What do I need to do this? Do I need to save them in a matrix or something like jit.cellblocks?

What I would like is a match when for instance 80% of the points match the saved ones (with a margin because they never will be exact due to the live input).

far from being my patch, this is a modded cv.blobs.sort help file. it will

take me a few more years to make something this useful ;)

as for detecting a change in a matrix... a simple way is to run jit.3m and

watch the mean value of the matrix, i guess (and could be wrong) it could

work but i am not sure. a matrix is a matrix.

remember that comparing 2 pictures is a very complicated things, a tiny

change in the angle, lighting,optics,etc gives totally different results.

check other cv objects. like moments or recon

> Thanks for your replies. I'm just a noob here. Your patch will take me

> I am able to extract the coordinates of jit.features now thanks to you

> Let's say I want to save the coordinates of all the feature points of one

> object once (feature point 1 to the last one taken from a still image?)

> Later I want to compare the feature points of a new object in my camera view

> What do I need to do this? Do I need to save them in a matrix or something

> What I would like is a match when for instance 80% of the points match the

> saved ones (with a margin because they never will be exact due to the live

far from being my patch, this is a modded cv.blobs.sort help file. it will
take me a few more years to make something this useful ;)

as for detecting a change in a matrix... a simple way is to run jit.3m and
watch the mean value of the matrix, i guess (and could be wrong) it could
work but i am not sure. a matrix is a matrix.
remember that comparing 2 pictures is a very complicated things, a tiny
change in the angle, lighting,optics,etc gives totally different results.
check other cv objects. like moments or recon
2006/10/18, Bart :
>
>
> Thanks for your replies. I'm just a noob here. Your patch will take me
> days to understand Yair :)
>
> I am able to extract the coordinates of jit.features now thanks to you
> Keith.
>
> Let's say I want to save the coordinates of all the feature points of one
> object once (feature point 1 to the last one taken from a still image?)
> Later I want to compare the feature points of a new object in my camera view
> to the saved ones.
>
> What do I need to do this? Do I need to save them in a matrix or something
> like jit.cellblocks?
>
> What I would like is a match when for instance 80% of the points match the
> saved ones (with a margin because they never will be exact due to the live
> input).
>

Are there any demo or example patches that use cv.jit.blobs.recon besids the one in the tutorial?

The tutorial example uses character recognition which makes it hard for me to understand how to use this object in a different way..for instance just recognizing a particular pattern on a single blob.

i havnt tried the recon objects. you my have better luck with outside

(opensourced) solutions like arttoolkit or reactables.

the first offer full 6dof output of its trackers, the second offer udp

http://mtd.fh-hagenberg.at/depot/graphics/artoolkit/index.html

http://ichim05.ichim.org/jahia/Jahia/lang/de/pid/547

> Are there any demo or example patches that use cv.jit.blobs.recon besids

> The tutorial example uses character recognition which makes it hard for me

> to understand how to use this object in a different way..for instance just

> recognizing a particular pattern on a single blob.

i havnt tried the recon objects. you my have better luck with outside
(opensourced) solutions like arttoolkit or reactables.
the first offer full 6dof output of its trackers, the second offer udp
output for integration into max.

http://mtd.fh-hagenberg.at/depot/graphics/artoolkit/index.html
http://ichim05.ichim.org/jahia/Jahia/lang/de/pid/547

On 11/7/06, Bart  wrote:
>
>
> Are there any demo or example patches that use cv.jit.blobs.recon besids
> the one in the tutorial?
>
> The tutorial example uses character recognition which makes it hard for me
> to understand how to use this object in a different way..for instance just
> recognizing a particular pattern on a single blob.
>

cv.jit.features getting the values of the feature coordinates