A bug in VLIB?

Jogging Song

Hi, all
I am using connected component functions from VLIB library.
For VLIB_createConnectedComponentsList, I get all regions with
different label numbers if I set minBlobArea to 1. The result is
correct. But I set minBlobArea to a number such as 50, the result
is incorrect. some Regions whose areas are smaller to 50 should be
labeled with 0, now still labelled with non-zero.
The version I am using is ver 2.0. Is there some new version?

Best Regards
Jogging

over 16 years ago

0 Mariana over 16 years ago

TI__Mastermind 24340 points

Hi Jogging,

EDIT: Some problems were corrected in VLIB 2.1 for VLIB_createConnectedComponentsList, but I'm not sure if what you mentioned was corrected. I asked for the VLIB responsible to jump in.

VLIB 2.1 should be ready soon.

0 Jogging Song over 16 years ago in reply to Mariana

Intellectual 685 points

Thanks, Mariana
How can I get it if the new version is ready? Do I need to submit a new request?
Last time it takes me about one month to get approval.

Best Regards
Jogging

0 Mariana over 16 years ago in reply to Jogging Song

TI__Mastermind 24340 points

I would guess that you do not have to request again, but let me confirm and get back to you.

0 Mariana over 16 years ago in reply to Mariana

TI__Mastermind 24340 points

Just confirmed that you do not need to request again. VLIB 2.1 should be there in a little more than a week.

I talked to the VLIB team, and some problems on the VLIB_createConnectedComponentsList were corrected for VLIB 2.1, but what you described might be a problem that they did not detect before. They are investigating and will get back to you here.

0 Senthil Kumar Yogamani over 16 years ago in reply to Mariana

TI__Intellectual 1450 points

Jogging,

I tried with different blob sizes now and it prunes out the smaller blobs.

Please note that the area parameter actually denotes the number of pixels in the component.

Can you provide your test case where it failed ?

Before that, can you set the minBlobArea parameter to very large value (slightly less than width*height) and see if you still see the components ?

Regards

Senthil

0 Jogging Song over 16 years ago in reply to Senthil Kumar Yogamani

Intellectual 685 points

Thanks, Mariana and Senthil
I use connected component labeling to remove small blobs in binary image.
In my case there are several large blobs and many small blobs. The smallest
blobs have only one pixel. I tried to set minBlobAreap parameter to a large
value so that only largest blob remains in the resultant image. The number
of connected component is correct. But I call VLIB_createCCMap8Bit to
get the label image, but the label image still have small blobs which seems
be labeled as 0xff(255).
If possible, I can send you my test image and test project.
By the way, I test it using the PC library. I usually run it successfully in PC, and
then run it on DSP.

Best Regards
Jogging