700tvl Vs 720p Hd Camera [PORTABLE]
Starting with 450 TVL vs. 700 TVL, we can see that performance is close, with no real gains in the higher TVL camera. Some letters on the eye chart are more legible in the 700 TVL camera, though it begins to wash out earlier than the 450 TVL camera, negating this benefit.
700tvl vs 720p hd camera
Moving up, we tested the 700 TVL camera against a 960H model, both captured at D1 resolution. The gains in the 960H camera are noticeable, with letters more legible, as far as line 5 vs. only line 3-4 in the 700 TVL model. Our subject's face is moderately clearer, as well, with slightly more detail of his features.
We compared a 600 TVL analog camera (the Q-See QM6006B) to the 700 TVL and 960H analog cameras, seen in the comparison below. The 600 TVL analog camera is able to produce more detail in both our subjects face and test chart than the 700 TVL camera, looking sharper overall. Performance relative to the 960H camera is close, though line 5 of the test chart is partly legible in the 960H model, while some characters in line 4 in the 600 TVL cameras are difficult to discern.
Next, we shot out the 960H camera, the top analog performer, against 720p and 1080p HD IP cameras in order to show the differences between these two technologies. The IP cameras easily deliver more details than 960H, with more lines legible on the test chart, and much better details of our subject's face.
In order to see if 960H could compete with HD at any field of view, we widened the 1080p camera's field of view to double that of the 960H camera. This comparison shows the relative field of view of each, as well as a zoom view of our subject. Even at a FOV this wide, 1080p still beats out the analog camera, with better details of subject and chart.
Manufacturers regularly claim 960H cameras have wider fields of view than D1. However, we found that 960H simply stretched 4:3 video to widescreen (using a 2:1 aspect ratio, not 16:9 as some claim). This resulted in substantial distortion, as with objects appearing squat and wide, as seen in this image:
Though the increase in pixel count with 960H offers no benefit, we found a visible increase in detail when connecting the QM9702B to a 960H-rated DVR, instead of D1 DVRs/encoders. This comparison shows the same camera, the 960H QM9702B, first connected to the 960H DVR, the QC524, then the D1 QT534. Notably, lines 5/6 are legible in the 960H DVR vs. 4/5 using the D1 model.
John, I wanted to see if there was possibility of using some other brands in distribution as comparison cameras. Example the Digital Watchdog, Speco, Clinton, or other cameras. Avigilon camera and Dahua cameras have been shown on various reports but few other cameras.
Luis, FOV was approximately this for all cameras. We had to stagger cameras about 1-2' in a couple of cases to account for differences in lenses, but the width of the FOV was standardized. I've inserted this in the report as well.
Good morning John, and thanks for the shootout. We do them here with some frequency. My question to you and to the industry is this. Why do IP or 1080p cameras "appear" to perform so poorly at night or low light? Is it just a matter of product maturation or is there something inherent in the devices, in your opinion?
1080p generally does perform worse in low light than lower resolution cameras, which you can see in a lot of our shootouts. Though the gap is narrowing somewhat, based on some recent cameras we're working with.
However, if you're looking at the comparisons above, it's because that specific camera adjusted exposure (not IR power in this case) differently than the others to compensate for the reflective objects (subject + chart) in the scene. The others simply did not adjust exposure as much.
That's because stated resolutions of greater than around 550TVL for analog cameras are doo doo. Most manufacturers "fudge" the numbers. One way they get away with it is by using a non-standard way of measuring TV lines. The proper way is to measure the number of vertical black and white bars that can be discerned in a square area of the screen whose width is equal to the total screen height. That was designed to eliminate differences caused by varying aspect ratios of monitors.
My guess is that the 450TVL camera spec is rated using generally accepted measurements while the 700TVL camera uses the "inflated" method. That would explain the extremely minor resolution difference.
The 720P and 1080P have increased vertical resolution ( more vertical pixels). In traditional analog we never discussed vertical resolution, only horizointal as most all cameras had 480 ( Theoretically 525) vertical lines.
A third of the 'pixels' in a 960H camera are essentially faked. There's no additional information, the pixels are just spread out horizontally wider. In actually, it's far more than a 2x pixel increase.
I consider them both to be value based manufacturers. Not a lot of innovation, but affordable. I will say that in all my years in security, I've never seen a Clinton camera in use at an actual end user.
Members, we added a section at the end of the report comparing 600 TVL to 700 TVL and 960H. As it turns out, the 600 TVL camera produces a sharper, clearer image than the 700TVL camera, while not appearing as washed out as the 960H.
That jibes with my findings. It confirms that cameras should not be purchased on specs alone - there's just too much fudging by manufacturers. We prefer to test samples of each camera under consideration in real-life situations and judge by what performance a camera actually delivers, rather than its specs. Far too often, lower-spec'd cameras outperform those with higher specs.
Another source of annoyance: many analog camera manufacturers are discontinuing their SD cameras in favor of 960H. What they choose to conveniently ignore is that 960H requires compatible DVRs or encoders to deliver any benefit at all; and even then, the benefits are marginal, at best. Our favorite analog box camera, the inMotion 11S4N2D was replaced by them with the far-pricier 960H 11S9N2D, which would offer no benefits to us. Thankfully, inMotion agreed to continue importing the 11S4S2D if we placed large (100 camera) orders, though how long they will continue to offer that is anyone's guess.
Measurements in TVL refer to the horizontal pixels of the image, while HD resolutions measure the vertical pixels on the image. This means that 720p, which is 720 pixels tall by 1280 pixels wide, is actually a better image than 1000TVL.
Security camera systems that use Cat5 or Cat6 ethernet cable are always going to have the best resolution. If you are setting up a new system, you should be looking at IP cameras that use Cat5 cable and Power Over Ethernet. This is another way to be sure that your cameras will record in HD.
If you are looking to upgrade an old Analog CCTV System to HD and use the same cables, you should look at a true HD over Coax technology like HD-TVI. Keep in mind that an HD-TVI camera will only get you HD resolution if you have an HD-TVI DVR as well, meaning that you cannot connect an HD-TVI camera to an Analog DVR.
As you may be able to tell at this point, the biggest difference within these different resolution cameras is the image quality as the image gets bigger. In other words, the preservation of image quality in different zoom settings is the difference in the different resolutions.
Soltech Security is our security product division of Soltech US Corp. Being that this is our main line of sales, we try our best to bring knowledge to our customers as well as our product users. There just isn't a lot out there that allows people to purchase with understanding of these cameras or camera systems. Being a smaller company, we can relate to the general end user and try to explain the products as clearly as possible. We gladly welcome questions and hope that you will find this little corner of information useful!
Add one of our Analog / HD-CVI switchable cameras to your surveillance system today! While in Analog mode, the cameras are compatible with analog DVRs. When time or budget allows, upgrade to a 720P or 1080P high definition DVR, switch the cameras to HD-CVI and instantly start recording in 720P or 1080P.
For conventional video surveillance cameras, they are analog cameras which output analog TV signals. Accordingly, TV line is used to refer the image resolution that the camera can capture. The resolution of image mainly depend on equipped CCD/CMOS image sensor. Based on different CCD/CMOS image sensor, analog camera can deliver standard resolution video with 700TVL, 650TVL, 480TVL, 420TVL etc. Higher TV line means higher resolution. Now, network camera becomes the mainstream, network camera outputs digital signal, manufacturers use pixel to refer the image resolution, such as 0.3 megapixel, 1 megapixel, 1.3 megapixel, 2 megapixel, 3MP, 5MP, even 8MP ultra high definition. Higher pixel means better image quality and higher resolution.
A television line is a distinct vertical line, alternately black and white, which can theoretically be displayed on a video image from a camera or on a screen. So, 400 TVL would mean that 200 alternating dark and 200 light vertical lines can be captured/displayed by the camera/monitor. This explanation is complicated however, by the fact that the horizontal resolution is expressed in relation to vertical resolution, in effect showing what the horizontal resolution would have been if the TV were square. But TVs are not square, and nor are camera images, indeed they tend to be 4:3.
Respectively, as the video recording and storage devices, Digital video recorder also has different resolution to define its video compression capability such as QCIF, CIF, HD1, D1 (FCIF), 960H (WD1) etc. A typical analog video surveillance system mainly composes of several cameras and DVRs. To achieve required video surveillance quality, both cameras and DVRs should have the same resolution specification, or DVRs may support higher resolution recording capability.
Analog camera and digital cameras both co-exist in current market. With rapid development of new technologies, both cameras become affordable. 960H, 720P and 1080P are different resolutions for security cameras. Today, we are going to provide some simple information about these different resolutions.