Analog vs HD Night Shootout

By: Benros Emata, Published on Mar 26, 2011

The whole point of megapixel is better image quality but what if megapixel was actually worse than analog at night? In the consumer world, maybe this is acceptable but in surveillance, most cameras need to 'see' 24 / 7.

[WARNING: This report is OUT OF DATE and should only be used for historical review. Megapixel / HD camera low light performance has improved significantly since 2011. See: Ranking IP Camera Low Light Performance]

In this report, we share our test results of head to head comparisons between analog, SD IP and Megapixel cameras. We asked a number of analog centric integrators, including the folks at CCTVForum.com, for their recommendations on their favorite analog cameras for use in low light scenes. Based on their recommendations, we bought a Bosch Dinion and CNB Mona Lisa and set them up side by side with megapixel cameras from our previous tests. We then tested them in a series of real world scenes.

Here is a preview of our test :

Inside the Pro section, we dig through the tradeoffs and key findings revealed in the tests. For background, make sure you understand the issues in exposure setting adjustments that we explained in detail in our 'How Exposure Impacts Low Light Surveillance.'

Key Findings

We note 3 key findings:

  • In a parking lot lit with street lamps (3 to 5 lux), megapixel cameras provided only minimal improvements in image detail over analog - far less than the number of pixels would expect to provide.
  • In a field with no direct street lamps and only ambient light (~0.5 lux), analog cameras provided far more detail than the megapixel ones. The analog cameras provided outlines of human subjects at a 32 ft width FoV while the megapixel cameras were so dark that it was almost impossible to make out the human subjects.
  • In under 1 lux scenes, the only way the megapixel cameras could provide similar image detail as the analog cameras was to significantly lengthen the exposure setting. However, of course, this increase motion blur - a major negative tradeoff.

In the video below, we show the key findings by analyzing the recorded test samples:

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Recommendations

With these key findings recognized, here are our recommendations:

  • Using megapixel in an outdoor scene with street lighting is likely still superior to analog (or SD IP). At night, minimal benefits are gained and during the day, significant benefits can be achieved. However, at night, megapixel cameras essentially waste bandwidth. If possible with one's VMS system, consider dropping the resolution level during the night.
  • Using megapixel in a scene with no direct lighting at night is problematic. If the scene must be surveilled in these conditions, either (1) lengthen the shutter, (2) add IR illumination or (3) use SD instead of megapixel. All of these have important drawbacks. Do not lengthen the shutter beyond 1/8s if you need to capture clear details of moving subjects (i.e., if you are not confident that an intruder will stop in the scene). Use integrated IR only if the subject is close to the camera (less than 40 feet). Otherwise, use add on IR (though expect to pay an additional $300+). [Note: for more, see our IR comparison report.] Finally, use SD only if you can accept less detail or the use of more cameras during the day.

Video Clips Download (ZIP File)

Review our Analog vs Megapixel Sample videos zip file (~230 MB) containing all the video clips and images generated during our testing. The clips are embedded inside an ExacqVision player and simply needs to be double clicked to view. In the Exacq player's Options menu we recommend enabling 'Show Camera Names' to show the names of the cameras on-screen.

The clips and images are from our Outdoor test (presented in this report) and Indoor (preliminary) tests as well as alternative setting tests.

Methodology

Three (3) Standard Definition, and two (2) Megapixel cameras are included in our low-light performance testing.

Standard Definition Cameras:

  • CNB BBM-24F - 1/3" CCD; F1.0 Computar; 600TVL (650TVL B/W); 0.005 Lux (B/W); online $120
  • Bosch LTC0498 - 1/3" CCD; F1.0 Computar; 540TVL; 0.98 Lux (100 IRE, B/W); online $400
  • Bosch NBN-498-21P - 1/3" CCD; F1.3 Bosch, 4CIF (704x480); 0.98 Lux (100 IRE, B/W); online $700

Megapixel Cameras (IP):

  • Sanyo HD4000 - 1/2.5" CMOS; F1.8 integrated lens; 1920x1080; 0.1 Lux (F1.8, b/w, gain: High); online $950
  • Pelco Sarix IXE20DN - 1/3" CMOS; F1.2 Pelco; 1280x720; 0.25 Lux (Mono, 33 ms); online $1,300

All SD cameras were analog, except for the Bosch NBN-498. A Sony SNTEP104 encoder was used to stream the analog cameras to our ExacqVision VMS. During testing default settings were used on the Sony encoder including a 720x480 resolution. The two MP cameras were configured for 720p resolution during all tests.

 

Here are the key default settings relevant to low light performance for each camera:

  • CNB BBM-24F - 1/60s shutter; AGC on '15'
  • Bosch LTC0498 - 1/60s shutter; SensUp 4x; AGC on '15'
  • Bosch NBN-498-21P -  1/60s shutter; SensUp 4x; AGC on '15'
  • Sanyo HD4000 - 1/30s shutter; AGC on 'normal'
  • Pelco Sarix IXE20DN - 1/8s shutter; (no gain setting in interface)

In the video below we examine each camera's admin interface focusing on exposure and gain settings, showing the defaults and available ranges for these low-light optimizations.

Scenarios/Applications

Two (2) nighttime/low-light test scenarios were devised that correspond to 'real-world' video surveillance applications:

  • Artificially Lit Area (Parking Lot); 3 to 5 Lux
  • No Light (Open Field) Area; ~0.5 Lux

In both primary scenarios two human subjects provide various examples of motion. The human subjects are positioned at a location within scene corresponding to a 32 foot wide FoV. As such the SD cameras provided roughly 20 pixels/ft. and the MP cameras provided roughly double the SD or 40 pix/ft. at the human subjects.

Tests

In the first Parking Lot scenario two (2) key tests were performed:

  • All 5 test cameras at default shutter and gain settings. This meant that the SD cameras had either 1/30s or 1/60s shutter speeds, the MP Sanyo had 1/30s and the MP Pelco had 1/8s shutter speeds.
  • MP Pelco camera configured for 1/30s shutter speed to normalize with the default 1/30s or 1/60s shutter speeds of the SD cameras.

The Open Field scenario featured four (4) key tests:

  • All 5 test cameras at default shutter and gain settings. This meant that the SD cameras had either 1/30s or 1/60s shutter speeds, the MP Sanyo had 1/30s and the MP Pelco had 1/8s shutter speeds.
  • MP Pelco camera configured for 1/30s shutter speed to normalize with the default 1/30s or 1/60s shutter speeds of the SD cameras.
  • MP Pelco camera configured for 1/250s shutter speed
  • MP Pelco camera configured for 1/500s shutter speed

We considered other MP cameras as well. For example, we considered the Axis 5MP P1347, and the Sony HD CH140. Due to various technical issues we decided to exclude them from our main study. However, it is key to note that their low-light performance levels were similar to the Sanyo and Pelco MP cameras included in the 'main' study.

Testing Issues

The Sanyo HD4000 featured in this report presented several issues during our testing and analysis. The first issue involved an inability to set the correct time on the camera. This became an issue when searching its archived video on our Exacqvision VMS. According to Exacq this is a potential problem when cameras and VMSes are not synced up, since the VMS will try to 'honor' the camera's time setting.  Because of this issue we could not export clips from Sanyo along with the other cameras in synchronous mode.

Another issue we faced with the Sanyo HD4000 was the inability to configure a slow shutter setting. Sanyo calls this a 'long' shutter, and it is a feature of the HD4000. However, we had difficulty in configuring the 'long' shutter setting reliably and excluded it from the study. Thus, the default setting of 1/30s was used throughout all tests.

If cameras shipped with lenses we used them in testing as it represents what users are likely to use in real world scenarios. The three IP cameras shipped with lenses, while the two analog cameras not coming with lenses were fitted with separately purchased Computar (F1.0, AI, varifocal) lenses.

5 reports cite this report:

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CNB Network Camera Review on Sep 08, 2011
Korean surveillance manufacturer CNB has historically been one of the more popular analog brands for budget / low cost appliations, viewed as a...
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Over the past year, Taiwanese megapixel manufacturer ACTi released a line of four-megapixel cameras, while discontinuing most of the standard...
Color Versus Day/Night Shootout on Apr 16, 2011
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