We tested IP cameras to see which camera worked the best in low light situations. We did some other tests as well for
resolution, and
wide dynamic range.
In this test we compared the low light performance of
the Samsung SNV-6084R IP and Sony SNC-VM630 cameras. We compared them to each other
and to an older Axis P3367 camera which has a reputation for good low
light performance.
Camera Specifications
All the camera specifications indicated about the same low light level when in color. The
Samsung camera had the best B/W low light sensitivity specification.
The test would determine if the cameras met their specifications.
| Samsung SNV-6084R |
Color: 0.1 Lux (F1.2, 50IRE)
B/W: 0.01 Lux (F1.2, 50IRE)
Image sensor: 1/2.8" PS Exmor 2.38M CMOS |
| Sony SNC-VM630 |
Color: 0.1 lx (F1.2, 50IRE, View-DR OFF, VE OFF, AGC ON, 1/30 s, 30 fps)
B/W: 0.07 lx (F1.2, 50IRE, View-DR OFF, VE OFF, AGC ON, 1/30 s, 30 fps)
Image sensor: 1/2.9-type progressive scan Exmor CMOS sensor |
| Axis P3384 |
Color: 0.15 lux, F1.2,
B/W: 0.03 lux, F1.2 with Lightfinder
Image sensor: Progressive scan RGB CMOS 1/3” |
The low light specifications also include frame rate (shutter speed) and IRE. The frame rate
relates to the shutter speed, so anytime you see a camera with frame
rate of less than 1/30 the second or if the IRE is at 30 IRE instead of
50 IRE, the lux value will be much different. Take a look at our article
about
IP Camera Low Light Sensitivity for more details about how low light sensitivity is measured.
The Test
We
compared these cameras to the 1 megapixel Axis P3384 because it has good low light performance (this is their specialty
low-light camera). Please note that a 1 megapixel camera is expected to
have better low light performance than a 2 megapixel resolution
camera. In spite of this, the 2 megapixel Sony and Samsung cameras
outperformed the 1 megapixel Axis camera.
We started out test at relatively low light and all the cameras provided decent images. We gradually decreased the lighting until all
the cameras could not see anything. All the cameras tested did not have
an IR illuminator or had them turned off.
In the setup of each camera we made adjustments to assure that all the cameras maximized their low light sensitivity. This included turning off WDR, turning on the
light enhancers (which is called different things depending on the
camera), keeping the cameras at 30 fps, and keeping amplification at 50
IRE.
We found that it was difficult to measure the actual light level (lux)
because most light meters do not go below 0.1 lux, so we did comparison testing. We took snapshots
from each camera at four light levels. The goal was to capture images
at each level of darkness and to compare all the cameras at the same
relative lighting level. We observed which camera displayed the clearest
image with the least noise level.
Test at approximately 0.5 lux
At this light level all of the cameras displayed little to no amplifier
noise with good visibility and brightness. For reference the light from
a full moon is about 0.3 lux to 1.0 lux depending how close to the
equator you are. The moon is brighter as you get closer to the equator.
The Sony and Axis cameras had the least amount of amplifier noise and
the highest brightness. Additionally it is important to note that
because the Axis camera has a 1 megapixel sensor, it displayed the image
in color while the 2 megapixel Samsung and Sony cameras had switched to
black and white mode. In this regard the Sony and Samsung camera did
not meet their published low light specifications in color.
Sony SNC-VM630: The image is very bright and clear. We can see the details of the scale. (Note this is a 2 megapixel camera).
Axis P3384: The image is in color. We can see the colors of the pen and
the details of the scale are visible. (This is a 1 megapixel camera)
Test at approximately 0.2 lux
With the light level reduced, all three cameras displayed high quality
images. The Axis camera stayed in color. All the cameras showed
detailed clarity and only a small drop-off in brightness with low noise.
The Samsung and Sony compared well with the Axis camera. The Sony
displayed slightly better image quality at this light level.
Sony SNC-VM630: Display is bright and clear with low noise
Samsung SNV-6084R: Noticeably darker image, but is still displaying a fairly clear image with little to no amplifier noise.
Lower Light Level (approximately 0.05 lux)
With the lighting reduced the Axis switched to B / W and showed the
darkest image with noticeable amplifier noise. The Sony displayed the
brightest image with the most amplifier noise. The Samsung displayed
average brightness with the least amount of amplifier noise. Overall the
Samsung displayed the image with the best combination of brightness and
low amplifier noise.
Sony Camera at very Low Light
Axis P3367: Noise level increased and it was difficult to make out the details of the scale.
Sony SNC-VM630: Increased noise but can make out more details than the Axis camera
Samsung 6084: The image is dark, but the least amount of noise with the clearest image.
The Lowest light level (approximately 0.01 lux)
Samsung at very low light level
This test was done at extremely low light level. It was below the
light sensitivity of the Axis camera. Under these conditions the Samsung
tested best. Despite showing a dark image there was very little
amplifier noise and the objects are visible. With the Samsung you can
clearly see the markers and the scale. The Axis camera displayed very
little and it was nearly impossible to identify our objects, the scale
and the markers. The Sony showed the outline of our objects to some
degree. The image is hard to see because of the lack of brightness, but
the extreme level of amplifier noise is the main factor causing our
inability to view the image on the Sony.
Conclusion
The Samsung 6084 won the low light sensitivity test, though the Sony was very close. It was interesting to
note that Sony provides conservative specifications for its IP cameras.
The tested performance was better than their published specifications.
Even though the camera has a published specification of 0.07 lux, it
was almost as good as the Samsung camera, with published specification
of 0.01 lux.
All the cameras displayed good images at light levels as low as 0.5
lux. The Axis camera stayed in color longer as the light was reduced,
but didn't perform well when it switched to B / W mode. At light levels
down to about 0.05 lux, the Sony camera provided a bright image, and
low noise, but at the lowest light level of about 0.01 lux, the Samsung
camera displayed the lowest amplifier noise and best image.
For assistance in selecting your IP camera, please
contact us for help.
