Distortion around Bounding Boxes

Bhargav Dave

Hi,

I'm experimenting with the semantic segmentation use case on the TDA2X EVM board. As a test, I want to draw bouding boxes around detected objects (etc. cars).

I've placed the BB drawing APIs in Alg_tidlpostproc_cpy after the dma copy.

I'm using Draw2D_drawRect to draw BBs on the output. I also do Cache_wb on the output buffers after the draw API.

What I'm observing is some distortion around the Bouding box region in the image. Is there something else I need to take care of?

Attaching a video which shows the effect.

over 6 years ago

0 Yordan Kamenov over 6 years ago

TI__Mastermind 42515 points

Hi Bhragav,

I have forwarded your question to an expert for comment.

Regards,
Yordan

0 Bhargav Dave over 6 years ago in reply to Yordan Kamenov

Intellectual 820 points

Any update on the issue, Yordan?

0 Sujith over 6 years ago in reply to Bhargav Dave

TI__Genius 12455 points

Hi Bhargav Dave,

Can you please ensure that the width/height being passed this function (Draw2D_drawRect ()) is correct. A simple test would be assert/check on the width & height provided to this function.

Determine the minimum height / width expected and and ensure that this function is not called with anything less than that.

Regards, Sujith

0 Bhargav Dave over 6 years ago in reply to Sujith

Intellectual 820 points

What do you mean by correct width and height?

I was under the assumption that any width and height you pass to Draw2D_drawRect(), it should draw bouding box of that size.

0 Sujith over 6 years ago in reply to Bhargav Dave

TI__Genius 12455 points

Hi Bhargav Dave,

The Draw2D_drawRect () is a simple API, it draws box of any dimention. If very small width & height is provided it draws that too (for e.g. if the width was 5 and height was 5) and this would seem like an artifact.

We had faced an similar issue, normally algorithm detected objects could be enclosed in 50x50 (width and height) and maximum was 300x300 but at times our algorithm would perform a FALSE detect and provide the bounding box to be 10x10. This looked like an artifact on the screen.

Our fix was a simple fliter based on the minimum/maximum, width/height.

Please check if you are facing the same issue

Regards,

Sujith

0 Bhargav Dave over 6 years ago in reply to Sujith

Intellectual 820 points

Hi Sujith,

Thanks for the clarification. I have verified that the bounding boxes aren't abnormally small or large.

Even for normal sized bounding boxes I'm seeing this distortion (you can actually see that yourself in the video in my original post).

Looks like this a different issue.

Bhargav

0 Suzana Komarcevski over 6 years ago in reply to Bhargav Dave

Prodigy 145 points

Hi Bhargav Dave,

I am also interested in drawing bounding boxes around detected objects, so please if you could share more information about what you did.

Suzana Komarcevski

0 Sujith over 6 years ago in reply to Bhargav Dave

TI__Genius 12455 points

Hi Bhargav,

Referring the attached picture picture (taken from the video that you had attached) please look at the horizontal line. Is this expected?

Also, are you using DSS WB link in your chain by any chance?

Regards,

Sujith

0 Bhargav Dave over 6 years ago in reply to Sujith

Intellectual 820 points

It's not expected (it is also part of the distortion issue I'm wresting with).

Im not using a DSS WB link.

0 Sujith over 6 years ago in reply to Bhargav Dave

TI__Genius 12455 points

Hi Bhargav,

Why don't you put in an assert when height is < 30 lines and check. Let's first ensure this horizontal line is removed, probably that might provides some debug pointers.

Regards,
Sujith

0 Sujith over 6 years ago in reply to Sujith

TI__Genius 12455 points

Hi Bhargav,

I hope this issue is resolved. If there are any additional questions, please raise another request.

Regards,
Sujith

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Distortion around Bounding Boxes