RoboRealm Forum

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Tue, 30 Nov 1999 00:11:00 EST

Dawson,

Ok, I think we found the issue. Try 2.44.23 and see if that works better. Keep the [] variable usage though.

STeven.

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Tue, 30 Nov 1999 00:11:00 EST

STeven,

Yes i tried that. It still did not work. The wrong blob keeps getting removed. Pls see the attached file. for p1=475 q1=47 the wrong blob gets removed.

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Tue, 30 Nov 1999 00:11:00 EST

Try

[p1] [q1]

instead. I.e. add the [] to tell RR you are using a variable.

STeven.

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Tue, 30 Nov 1999 00:11:00 EST

Hi STeven,

The invert feature works with absolute values (cogX and cogY). But when i use values from a variable it does not seem to work correctly i.e. you get a different result from using absolute values.

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Tue, 30 Nov 1999 00:11:00 EST

Steven,
I need to compare suitable size of blob, and distance blob from camera for image processing. can i use blob filter for this job?

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Tue, 30 Nov 1999 00:11:00 EST

Fantastic. Thanks.

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Tue, 30 Nov 1999 00:11:00 EST

Dawson,

Yes, the invert was a little confusing in that it only applied to the threshold. I.e. if invert is selected then it would filter out all blobs that are below the specified threshold. This was not what you needed and to clarify things we added a second invert that will now operate on the count. Thus if you select a count of 1 which would normally give you back the one blob with the highest weight, inverting that will now give you back all other blobs that would have been eliminated minus the highest weight. Ie. it returns all blobs EXCEPT for the blob with the highest weight.

So in the new interface use

count = 1 [x] invert
weight = 0 [ ] invert

and you should get what you need.

v. 2.44.20 has this update.

STeven.

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Tue, 30 Nov 1999 00:11:00 EST

I have attached a simple test here. I am trying to remove the blob with COG_X=363 and COG_Y=35. When i use the nearest blob filter with the following settings:

count =0
weight=0.99
invert on

Two (or more) blobs get removed instead of one. Setting weight=1 doesn't help either.

I initially assumed that in the invert mode the count specifies how many blobs are removed. However this is not the case.

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Tue, 30 Nov 1999 00:11:00 EST

I tried using the invert feature (blob filter module) to remove the unwanted blobs one by one until only the wanted blobs remained but it did not work. Possible bug?

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Tue, 30 Nov 1999 00:11:00 EST

What if i have isolated 3 blobs (instead of one)? How would i show just the 3 blobs?

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Tue, 30 Nov 1999 00:11:00 EST

Excellent. Thanks

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Tue, 30 Nov 1999 00:11:00 EST

Dawson,

Use the blob filter again after your VBScript and use the Proximity->Nearest and then specify the COG of the blob you selected using

[my_cog_x]
[my_cog_y]

in the X and Y fields. That means select the blob nearest to the provided X and Y coordinates.

STeven.

Showing a specific blob

Tue, 30 Nov 1999 00:11:00 EST

Hi STeven

If i used the blob filter to narrow down the blobs to say 4 blobs and used VBScript to choose only one, how do i get the display to show that particular blob that i want?