store 400hz images on sd card with QQQVGA

OpenMV related project discussion.
Yifei
Posts: 1
Joined: Thu Dec 05, 2019 10:53 am

store 400hz images on sd card with QQQVGA

Postby Yifei » Thu Dec 05, 2019 11:03 am

Hi,

I am working on a project which we would like to record QQQVGA images (60 by 80) on SD card with OpenMV4 H7 Cam. However, when I use the image.ImageWriter, the function seems to cost some time and I couldn't get 400 frame rate in the end. Is there anyway that can make it faster to record images on sd card?

Thanks a lot!
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iabdalkader
Posts: 1228
Joined: Sun May 24, 2015 3:53 pm

Re: store 400hz images on sd card with QQQVGA

Postby iabdalkader » Thu Dec 05, 2019 12:35 pm

Hi, currently it's not possible to get higher speeds, the images are not buffered in memory they get written to the SD card one by one, which is much slower than writing multiple sectors to the SD (with buffering on I can write up to 4MB/s).

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