Compiler/TDA4VM: In YUV format, if the number of cameras is set to 4, why no screen come out?

yoonseong kim

Intellectual 400 points

Part Number: TDA4VM

Tool/software: TI C/C++ Compiler

Hello Expert,

I use YUV format camera.

If I input 4 cameras in Multicam, no screen comes out.

However, if i input 1 camera, the data from four cameras are stored in one buffer and screen come out.

captureObj->image_arr[q] = vxCreateObjectArray(context, (vx_reference)yuv_image, sensorObj->num_cameras_enabled);

I tried changing the code as below.

captureObj->image_arr[q] = vxCreateObjectArray(context, (vx_reference)yuv_image, 4);

But The same is true even if the index is fixed to 4 in the code.

What is the reason?
I want to have each buffer for each camera.

I would appreciate if you can tell me how.

Thanks.

Regards,

Kim

over 5 years ago

0 Shyam Jagannathan over 5 years ago

TI__Genius 10355 points

Hi Kim,

What you see on the screen is different from what is captured. The images from 4 cameras will always be captured in 4 separate buffers. But while displaying on the screen we combine the 4 images by resizing and show one stitched image on the screen. Can you please send a snapshot of what you are seeing?

Regards,
Shyam

0 Brijesh Jadav over 5 years ago in reply to Shyam Jagannathan

TI__Guru**** 479035 points

Hi Kim,

Also please refer to for changing multi-cam example for YUV camera.

Rgds,

Brijesh

0 yoonseong kim over 5 years ago in reply to Shyam Jagannathan

Intellectual 400 points

Hello, Expert

Thank you for your advice.

I've tried a lot in until now.

Now I can input camera 4 at start multicam, and images from 4 cameras can be captured in 4 separate buffers.

But, when displayed, only the 0 channel camera is displayed.
Even if i put the another(CH 1,2,3) channels, only 0 is displayed.

Currently I am trying to combine 4 images using Mosaic, but it doesn't work.

My camera is passing YUV422 data.

According to

It is said that YUV 422 data needs to be converted from LDC node to 420, and then put in Mosaic node.

Is what I understood right?

Could you tell me some advice?

Thanks,
Regards

0 yoonseong kim over 5 years ago in reply to Brijesh Jadav

Intellectual 400 points

Hello Brijesh,

I have already checked the forum, but it does not seem to work properly in my environment.

But that code helped me a lot.

Thanks,

Regards,

0 Brijesh Jadav over 5 years ago in reply to yoonseong kim

TI__Guru**** 479035 points

Hi Kim,

But what is the issue you are seeing? Is it not working, still not capturing?

Rgds,

Brijesh

0 yoonseong kim over 5 years ago in reply to Brijesh Jadav

Intellectual 400 points

Hello Expert,

Sorry for not sharing my situation.
I solved issue.

Thank you for your advice.

Regards,

Kim

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Compiler/TDA4VM: In YUV format, if the number of cameras is set to 4, why no screen come out?