Even if not related to an IP camera, misinformation is misinformation. The link he posted has good information in it, how he interpreted it as what he initially said is beyond me.
CCTVCam
Known around here
- Sep 25, 2017
- 2,815
- 3,683
This is absolutely my last post on the subject.
It is not my intention to inflame Fenderman, it's his forum, his rules.
CCTV Camera Settings: Here's How to get the Best Picture Possible
Ok, so you have enough ‘pixels on target’ for identification, but what if your target is moving? People often walk. Using one of the UK Home Office CCTV test faces we can see how sufficient detail can still get destroyed (see below right).
The left-hand image has a camera shutter of 1/30s, which is probably true of every camera that’s fitted and left on factory default camera settings. The right-hand image has the shutter deliberately shortened to 1/125s. See the advantage?
The factory default CCTV camera settings give us motion blur at walking speed which destroys the identification details that all those pixels were meant to give us. You need to set a sufficiently fast shutter to freeze the motion.
Now when dealing with cars, which travel at more than walking pace (!), the average distance travelled during the exposure period is higher, so this requires a higher shutter speed to freeze the motion and ensure the text of the number plate is readable. Blur is the result of the object moving during exposure and the faster the shutter speed, the less movement in the exposure period and the less blur.
From the same page:
Training: Frame Rates for IP Cameras
Walking Examples
As our subject walks through the FOV, we view how far he moves from one frame to the next. In 30 and 10 fps streams, he does not complete a full stride. However, in the 1fps example, he has progressed ~4' between frames, which falls in line with our measured walking speed of ~4' a second.
You can see here despite this being 2 steps only, how the subject at 1fps jumps position almost from 1 window to the next. This occurs because the movement between the 2 positions falls during the period when the shutter is closed. At 1fps, the shutter is closed for the majority of the time - 29/30ths of the second at 1/30th second shutter speed.
Increase the frame rate to 10 fps, then the image is captured 10 times during 1 second at 1/30th second each time = 10 x 1/30th frames = 10/30ths = shutter is now only closed for 20/30ths of a second and not 29/30ths. Further more, because the captures are divided between the 1 second period, at 1fps there's a solid block of 29/30ths of a second of no capture, whereas at 10fps the frame is divided into 10 equal periods of 1/30th of capture and 2/30ths of non capture. This means at 1fps, the object can travel 29/30ths of a second without being captured, whereas at 10fps it can travel only 2/30ths of a second without being captured. Thus the chances of it travelling a discernable distances between frames is higher at 1fps, than 10fps. That said, as I said above, the object speed also plays a part as the faster an object is travelling, the greater the distance it can travel in any given time period and thus the greater the distance it can travel during the non captured period, and the higher the risk this travel will be noticeable as a jump.
The jumps are even more pronounced in the capturing faces example below the above one on the linked page.
As I said, now out. Hope that helps you understand was what I was saying.
fenderman
Staff member
- Mar 9, 2014
- 36,892
- 21,407
its a bunch of nonsense and not applicable...it amazes me that someone will comment on this subject without owning an ip camera...
Stupid question time:
Anyone know how to export the settings from the web-ui on these cameras? Using my modest intelligence I found this, but damned if that export button doesn't do anything at least on firefox or IE.
Is there some secret hand signal?
Anyone know how to export the settings from the web-ui on these cameras? Using my modest intelligence I found this, but damned if that export button doesn't do anything at least on firefox or IE.
Is there some secret hand signal?
Wanted to share my feedback on this "highly rated" camera. I bought couple of these cams, but for the $$$ I am not impressed. One has bad focus in the corner and no way to adjust, the second one is fine, but image quality (especially at night) is not very impressive. At the same time I also bought no brand camera with the same IMX290 and 5x AF varifocal for half the price to compare and I liked image better. My guess Dahua is using lower quality lens on these cameras. The software is better on Dahua though. I might find some use for these cameras or sell them, haven't decided, but it's disappointing.
I would like to see some night video of the IMX290 no name brand. Can you post some videos in the camera capture topic?
fenderman
Staff member
- Mar 9, 2014
- 36,892
- 21,407
bad focus is a defective camera...happens..bad night image is user error...you will soon see what happens why you buy a no name camera for "half price"
Q™
IPCT Contributor
Your previous post was supposed to be your last post to this topic.
Just stop. Please. You've done a superb job demonstrating how clever and intelligent you are; you can't possibly do a better job on that account. So just stop now.
It's 5231R-Z, I just realized that no brand cams have IMX290 while 5231R-Z is using IMX291 which explains why my Dahua is worse, IMX290 is actually an improvement over IMX291. I have a bunch of other Chinese cams with IMX322 which been running fine for over two years now and thought it was time to upgrade to cams with newer tech.
This is the other cam i have Sony Starvis IMX290+Hi3516C 1080P IP Camera 5X Motorized Zoom Auto Focus 2.8 12mm Outdoor IP Dome Camera IR cut Onvif 2.4 RTSP-in Surveillance Cameras from Security & Protection on Aliexpress.com | Alibaba Group
Philip Gonzales
Getting comfortable
- Sep 20, 2017
- 697
- 554
Whichdawg
n3wb
- Oct 21, 2017
- 5
- 4
yay we just ordered our first Dahua Starlight! I'll be reading these pages for days! 
giomania
IPCT Contributor
- Jun 1, 2017
- 784
- 540
yay we just ordered our first Dahua Starlight! I'll be reading these pages for days!
Just visit the link in my signature for my cliff notes on this thread; it may save you some time.
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giomania
IPCT Contributor
- Jun 1, 2017
- 784
- 540
It worked for me on the "2017-03-24" firmware a couple of months ago. I may have used Chrome.
Mark
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Superdon
Young grasshopper
- Oct 21, 2017
- 39
- 2
Following my earlier request for a pic. Here is where I would plan to install this, on the vertical wall using PFA137 junction box. Aim is to cover as much of the driveway as possible and up to the front door. I also dont want the camera to be too in your face. I have marked the pic with a (approx to scale) circle where I would install. Thoughts on this?
looney2ns
IPCT Contributor
Following my earlier request for a pic. Here is where I would plan to install this, on the vertical wall using PFA137 junction box. Aim is to cover as much of the driveway as possible and up to the front door. I also dont want the camera to be too in your face. I have marked the pic with a (approx to scale) circle where I would install. Thoughts on this?
Paint it the same color as the brick and hardly anyone will notice.