Showing posts with label active-x. Show all posts
Showing posts with label active-x. Show all posts
Wednesday, March 21, 2012
What is a SWIR camera?
Government and military technology eventually seems to find it way to consumer markets- GPS and night-vision being two great examples.
There is a new technology in early development called SWIR, or Short Wave Infrared camera technology.
Users want to use camera to see in darkness, and the ubiquitous technology uses IR sensors (often arrayed in a ring surrounding the lens) to detect Infrared waves. Being outside the spectrum of visible light, these waves can be detected in darkness, but often with very limited range. A typical IR range might be 10-30 meters for a home camera, and IR detection tends to consume a lot of power.
Along comes SWIR which actually still uses IR, but at the fringe of visible light. Instead of detecting classical IR wavelengths (aka, HEAT), these detect reflected IR energies. They offer advantages in power consumption and perhaps even camera range. The technology is new, using GaAs detectors (which few semiconductor companies can produce).
Watch for SWIR technology to start finding it's way into consumer camera in the next few years!
Labels:
active-x,
aperture,
budget,
camera,
CAT-V,
clip,
ddns,
ddns router,
depth-of-field,
focus,
ip camera,
ip camera analog,
swir
Wednesday, February 22, 2012
Can I FOCUS an IP Camera?
..not really. Like point-and-shoot cameras, most IP cameras do not have a manual focus. This is generally not a problem however, since the objects in view are distant enough to not require focusing.
And also like point-and-shoots, you cannot vary the depth-of-field, aperture or F-Stop settings, so a shot like this would not be easy!
You can, in some cases, find alternate lenses for your camera. I've seen wide-angle, fish-eye and other options. Note that since these lenses tend to distort the photo geometry, they may not be useful for details like facial recognition, license-plate legibility, etc.
You can also sometimes find interchangeable lenses which offer other lens diameters.
What WOULD be nice, but I haven't seen, are UV or other filters.
I have noticed that some IP Camera controls do offer focus- so I tend to think that some manufacturers probably offer it. I haven't seen one yet, however.
I have noticed that some IP Camera controls do offer focus- so I tend to think that some manufacturers probably offer it. I haven't seen one yet, however.
Tuesday, February 21, 2012
What software do I need for my IP Camera?
Starting with a question- what software do you (probably) already have? Correct- some flavour of Microsoft Windows, and Internet Explorer. That means that for like 90% of IP Camera, you already have MOST of what you'll need.
Unfortunately for linux or BSD or other OS-users (AIX?), it's gonna tough for you to use an IP Camera unless you're particularly handy and clever. Even in Windows, its not always easy.
The main challenge is the video content, and how to display it. I see ACTIVE-X as the most common transport, which is both good and bad. The bad news- you probably don't already have a compatible copy of Active-X on your system, which means you have to load it. Luckily you'll probably get prompted to load it (if not you may have to fiddle with IE Security settings).
The other problem is, many suppliers offer unsigned-copies of Active-X, which likely means even MORE fiddling with security settings to get it loaded. In IE these settings are found in the CUSTOM ZONE menus. Look for the radio buttons that allow prompting for download of Active-X in various states (ie, unsigned).
Life can be a bit simpler if you need less functionality, and you elect another transport like server push, or VLC. Those may also need plug-in installs, but they can be less-daunting than Active-X.
If you're actually INSTALLING the camera, you may also need the software from the camera seller, provided on CD, DVD, or downloaded from their site. It seems that unlike modern routers, you can't just plug the camera into a CAT-V cable, type 192.168.1.N into a browser, and voila there it is! Loftek and others provide *discovery software* that sort of locates the camera, and leads you through some steps to do preliminary configuration. I believe much of this will soon vanish- early routers had this same issue, but quickly evolved past it. But for now you may need to install and run this from the Camera's CD or website.
There are various other utilities and software you might need such as DDNS-disable, net-config, etc. These should be described on the camera webpage, or in the manual.
Once you're set up and stable, you won't need to worry about all of this again unless your settings go haywire. Pray that doesn't happen!
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