Linux/TDA2PXEVM: Subframe capture using OV2775 sensor on TDA2Px EVM

Vishal Badole27

Part Number: TDA2PXEVM

Tool/software: Linux

Hi,

I want to capture a full image in 4 subframes using OV2775 sensor, so that I can process these sub frame one by one for encoder. Can anyone suggest me how to do that?

over 5 years ago

0 Brijesh Jadav over 5 years ago

TI__Guru**** 410935 points

How many subframes per frame??

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

Hi Brijesh,

We need to capture 1 frame into 4 subframes. The whole idea is to capture a full image into slices by slice (4 slice per frame).

Regards,

Vishal

0 Vishal Badole27 over 5 years ago in reply to Vishal Badole27

Intellectual 260 points

Hi Brijesh,

Is there any option in vision SDK to capture the images slice by slice? And if it is there can you please guide help me to do the same with OV2775 camera sensor on TDA2PX EVM?

Regards,

Vishal

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

Vishal,

Subframe capture is not supported..

Rgds,
Brijesh

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

Hi Brijesh,
Thank you for this information.My task is like that
ISS_Capture + Encode + Null

here I have to capture full frame(Image) but I have to send divide this frame (image) into four subframes (Slice) and then these subframes will be passed one by one to encoder. Encoder output will be stored into a file. The idea fof dividing full image into slices is used to reduce the latency. Can please guide me how to do this.
Regards,
Vishal

0 Vishal Badole27 over 5 years ago in reply to Vishal Badole27

Intellectual 260 points

Hi Brijesh,
Any update?

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

Hi Vishal,

As i said, the module does not support this feature. At max, you could divide the into two slices.. But again, i am not sure if encoder supports..

Rgds,
brijesh

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

Hi Brijesh,

I went through the CAL in TRM. I see there is one register CAL_CSI2_VC_IRQENABLE_I. It has 4 FrameStart, FrameEnd, LineStart, LineEnd IRQs. Can we configure each one of these for slice boundary and get 4 interrupts for 4 slices ?

If above is not possible may be since it is special packet detection(like Start frame, Start Line etc) and (Sensor)CSI2 may not provide at slice boundary these special packets, as another approach, is it worth counting the lines and proceeding with submitting buffers to encoder at the slice boundary. i.e. we would count the LineStart(End) interrupts and if it matches the slice boundary, submit the buffer to encoder unit. I see you mention encoder may not support slice. But it looks like there is support for slice in VIP port. If so would encoder be any different for VIP port and CSI2 port ?

Regards,

Vishal

0 Vishal Badole27 over 5 years ago in reply to Vishal Badole27

Intellectual 260 points

Hi Brijesh,

Any update for the same?

Regards,

Vishal

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

Hi Vishal,

By the time you see this interrupt, DMA would already have started for the next line..

Also buffer could be changed only at frame boundary..

Rgds,

Brijesh

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

Hi Brijesh,

Do you think, is it possible to change DMA to slice boundary and also changing of buffer at slice boundary, since the configuration of the same would be at the software ?

Regards,

Vishal

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

Hi Vishal,

DMA cannot be changed, DMA works at the frame boundary.

But i think there is a interrupt that we can get at configured number of lines. But this is not every X lines, only after first X lines are captured..

Rgds,

Brijesh

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

HI Brijesh,

Now I got know that its not possible to get slice from ISS capture driver with existing pipe line. So that now I want use timer interrupt to notify my main application when certain number of line will be captured in system buffer that we have allocated to driver without dequeueing the buffer and as I will get notification, I will read only those number of line and will send to another link for processing. But I am not able to get to know in which file, driver is writing into the system buffer and how it is counting the number of lines captured, to notify to the application for end of frame. I am using TIDA-01130 (ov2775 + UB953 ) camera system. Can you please guide me in which files I need to see for the same.

Regards,

Vishal

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

Hi Vishal,

It is not currently support in the driver, to know which buffer is being written. You would require to add this feature, and then start the timer in the capture callback to get n-line interrupt..

Rgds,

Brijesh

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

Hi Brijesh,

I want to count the number of lines being captured and once the required number of lines will be captured then I will generate a timer interrupt. can you please guide me how can I do this?

Regards,

Vishal

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

May be you could start a timer on every interrupt, then set the timer counter to line interval and then count the interrupt and send the notification once number of interrupts are received.

Rgds,

Brijesh

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

Hi Brijesh,

Now I am able to send slices from ISS Capture link to ISSM2MISP link but now I am getting an assertion because of

GT_assert(VpsIssCoreTrace, (FALSE ==
VpsHal_issh3aIsAewbBusy(
hIspObj->halHandles[
VPS_ISS_ISP_MODULE_H3A])))

Now width and height of each slice to be processed are 1920 and 270 respectively. I have configured ISSM2M driver for each slice using output channel information of ISS Capture link with respect to each slice's size. Can you please tell me why I am getting this assertion?

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

Vishal,

ISP does not support sliced based mode. You need to run it at full frame mode..

Rgds,

Brijesh

0 Vishal Badole27 over 5 years ago in reply to Brijesh Jadav

Intellectual 260 points

Brijesh,

Thank u for your response, but ISP should treat each slice, sent by ISS, as a full frame only. And if it is not possible then can you please suggest me how to tell ISP that it should consider each slice as a frame only?

And one more thing If I disable h3aIsAewb then I am not getting any assertion but Slices received at ISP output are not proper.

Regards,

Vishal

0 Brijesh Jadav over 5 years ago in reply to Vishal Badole27

TI__Guru**** 410935 points

Vishal,

It is not possible to run ISP in sliced mode. There are lot of modules in ISP, which runs multi-tap filters, because of which if you divide frame into slices, there could be artifacts at the border..

Also AEWB algorithm cannot run on sliced frame, it requires full frame..

Rgds,

Brijesh

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Linux/TDA2PXEVM: Subframe capture using OV2775 sensor on TDA2Px EVM