Img Capture without display

Discussion related to "under the hood" OpenMV topics.
zamolxes
Posts: 2
Joined: Tue Nov 19, 2019 5:15 pm

Img Capture without display

Postby zamolxes » Tue Nov 19, 2019 5:25 pm

Hi

I need to capture some images of VGA size and process them. I noticed FPS it's not great.
There are any options to disable "the display of the image on PC" ??? will this increase FPS ??
I only need the output result on PWM

Thank you

Andrei
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iabdalkader
Posts: 1142
Joined: Sun May 24, 2015 3:53 pm

Re: Img Capture without display

Postby iabdalkader » Tue Nov 19, 2019 7:20 pm

zamolxes wrote:
Tue Nov 19, 2019 5:25 pm
Hi

I need to capture some images of VGA size and process them. I noticed FPS it's not great.
There are any options to disable "the display of the image on PC" ??? will this increase FPS ??
I only need the output result on PWM

Thank you

Andrei
You can disable the framebuffer, but it won't increase the FPS by much, and you can't process color VGA images.
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zamolxes
Posts: 2
Joined: Tue Nov 19, 2019 5:15 pm

Re: Img Capture without display

Postby zamolxes » Thu Nov 21, 2019 7:14 am

Hi iabdalkader

I was not aware that it is possible. Anyway, I see no improvement.

My setup uses very short exposure time,

Do you know what is the transfer time from sensor to MCU buffer??

Can we trigger img acquisition through a timer .. it would be helpful for my application to have rigorous time period between frames...

I was under the impression that the slow fps is caused by MCU to PC connection...

Thank you

Andrei
User avatar
iabdalkader
Posts: 1142
Joined: Sun May 24, 2015 3:53 pm

Re: Img Capture without display

Postby iabdalkader » Thu Nov 21, 2019 10:45 am

zamolxes wrote:
Thu Nov 21, 2019 7:14 am
I was not aware that it is possible. Anyway, I see no improvement.
I see the FPS goes up from 10FPS to 30FPS when FB is disable (OV7725, VGA mode, default exposure, running helloworld.py).
zamolxes wrote:
Thu Nov 21, 2019 7:14 am
Do you know what is the transfer time from sensor to MCU buffer??
You can find the exact numbers in the sensor's datasheet.
zamolxes wrote:
Thu Nov 21, 2019 7:14 am
Can we trigger img acquisition through a timer .. it would be helpful for my application to have rigorous time period between frames...
No it's not possible to sync the frame capture.

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