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by sanjaya
Sat Jul 21, 2018 1:21 am
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 67
Views: 150411

Re: Multiple cameras on a single raspberry pi board

@JayG: https://lb.raspberrypi.org/forums/viewtopic.php?f=43&t=218576 easy yet brutal way. - 4 pi + ov5647 camera with the frex pads exposed - a centralized pwm wired to the cameras frex - run the cameras with the same settings (they don't have to start simultaneously) - set pwm frequency according t...
by sanjaya
Sat Jul 21, 2018 12:58 am
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 19
Views: 2643

Re: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

ov5647 sensor can handle global shutter (if the hardware is available) despite the lack of hardware support (nor a software to utilize them) arducam exposes the frex and strobe pads in its board http://www.arducam.com/raspberry-pi-camera-rev-c-improves-optical-performance/ Minor correction here. Th...
by sanjaya
Fri Jul 20, 2018 1:55 pm
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 19
Views: 2643

utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

reposting as a new thread jic it would increase exposure level. i hope someone would be interested to pick this up do further explorations. ov5647 sensor can handle global shutter (if the hardware is available) despite the lack of hardware support (nor a software to utilize them) arducam exposes the...
by sanjaya
Fri Jul 20, 2018 11:42 am
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

Re: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

just for the record.
sanjaya wrote:
Thu Jul 19, 2018 10:59 am
last frame of raspiyuv would always shift
https://www.dropbox.com/s/u956j2zs5s1e7 ... t.avi?dl=0

Code: Select all

raspiyuv -rgb -o /dev/shm/gone 
by sanjaya
Fri Jul 20, 2018 10:18 am
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

Re: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

@6by9: great. thanks.

@KnarfB uploaded 3 more test patterns; as per your suspicion, the doc is wrong -- 92 is what we want.
by sanjaya
Fri Jul 20, 2018 7:30 am
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

Re: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

some test pattern samples have been uploaded @https://www.dropbox.com/sh/rxvdd360765tjso/AADYXYjioBTlYDe4GyN4Z2pYa?dl=0 ./raspiraw -hd -md 2 -r "503D,80" -o 503D_80.raw ./raspiraw -hd -md 2 -r "503D,81" -o 503D_81.raw ./raspiraw -hd -md 2 -r "503D,C0" -o 503D_C0.raw ./raspiraw -hd -md 2 -r "503D,C1"...
by sanjaya
Fri Jul 20, 2018 2:55 am
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

Re: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

@ethanol100: thank you very much for participating. my working environment vibrates too much for doing these kinds of precision tests. raspiraw would reset all registers. perhaps raspividyuv & raspiyuv don't try to do the same -- and combinations of mismatched registers causing the oddities observed...
by sanjaya
Thu Jul 19, 2018 3:25 pm
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

Re: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

PLEASE stop editing old posts. Do it too much and I'll drop off the thread. noted. different forum has different rules. apologize for not familiarizing with the rules here. 1. Did you forget to add the -md 2 parameter to raspividyuv? Without it it would be using the cropped 1080P mode. (Hmm, suppor...
by sanjaya
Thu Jul 19, 2018 10:59 am
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

Re: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

@6by9: thanks for your suggestion. sadly, encountered the same problem mentioned in this thread: https://www.raspberrypi.org/forums/viewtopic.php?t=189757 will try to download the source and compile -------------- edit 19-jul 2018 19:15 (gmt+7) ---------------------- same problem with the latest sou...
by sanjaya
Mon Jul 16, 2018 3:29 am
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

Re: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

@KnarfB: thanks for your analysis to summarize: - pi camera uses yuv420 (ref: https://picamera.readthedocs.io/en/release-1.3/recipes2.html#unencoded-image-capture-yuv-format) - with this chroma subsampling the block would be 16*16 (ref: https://en.wikipedia.org/wiki/JPEG#Block_splitting) - the heigh...
by sanjaya
Fri Jul 13, 2018 12:48 pm
Forum: Camera board
Topic: Wide angle camera pictures needed
Replies: 1
Views: 357

Re: Wide angle camera pictures needed

this one is 160° https://i.imgur.com/ttU4ksF.png this one is 175° https://i.imgur.com/k2ZhpQF.jpg close up (forgot whether it was 160 or 175 https://i.imgur.com/YgGMNrf.gifv pretty sure the fov stated is the diagonal fov. bear in mind that the board is meant for this https://www.amazon.com/dp/B0759G...
by sanjaya
Thu Jul 12, 2018 1:23 pm
Forum: Camera board
Topic: either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)
Replies: 17
Views: 1396

either raspistill or raspivid is not in native resolution at 2592*1944 (ov5647)

result : https://i.imgur.com/YgGMNrf.gifv https://i.imgur.com/YgGMNrf.gif to reproduce: raspivid -w 2592 -h 1944 -t 500 -md 2 -ISO 100 -br 60 -cd MJPEG -o vid_02.mjpg raspistill -o still_02.png what i've observed thus far: - raspiraw, raspistill and v4l all share similar field of view - raspivid out...
by sanjaya
Wed Jul 11, 2018 10:25 am
Forum: Camera board
Topic: Very bright light (for high framerate videos) safety considerations
Replies: 5
Views: 903

Re: Very bright light (for high framerate videos) safety considerations

hi, i've read your other threads so i reckon you "need" the bright light to minimize rolling shutter effect? might i suggest going with strobe? we've proven it works in both modes for ov5647 - frex-pad --> frex pin/pad acting as input (from an external global shutter) - frex-i2c --> frex pin/pad act...
by sanjaya
Wed Jul 11, 2018 3:37 am
Forum: Camera board
Topic: Raw pixel data from camera?
Replies: 1
Views: 395

Re: Raw pixel data from camera?

the expectation i got from reading the title was "betrayed" after reading the content. reckon that you'd have faster and better respond by replying on the thread you mentioned. anyway, this is a minimalist implementation that might serve your need import cv2 import numpy as np # lo_h might be bigger...

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