Digital or Optical zoom for Security Cameras
When shopping for security dome cameras with zoom
capabilities, the question I ask myself is which is more important; digital or
optical zoom? When speaking of surveillance cameras you want to get
“close” to a subject from a fixed camera position. The zoom control on your
digital camera will let you get “close” enough to capture that bigger image. It
will also let you zoom out to include a wide angle of view.
What
is optical zoom?
Optical zoom is a true zoom lens, which is physically extend to magnify your
subject. A motor controls the lens movement.
What
is digital zoom?
Digital zoom is simply some in-camera image processing, basically decreasing
the apparent angle of view of a digital photographic or video image. To make the cropped area
bigger, digital zoom makes up, or interpolates, pixels to add to the image,
which may give less than satisfactory results.
Zoom meaning the ability to make something distant appear closer.
Basically it’s a ratio of the longest and shortest focal length.
A 17mm (Wide) to 50mm (Tele) lens would be roughly 3x zoom. (50/17 = 2.94)
However a 70mm (Wide) - 200mm (Tele) lens would also be a roughly 3x zoom. (200/70 = 2.86)
A 17mm (Wide) to 50mm (Tele) lens would be roughly 3x zoom. (50/17 = 2.94)
However a 70mm (Wide) - 200mm (Tele) lens would also be a roughly 3x zoom. (200/70 = 2.86)
Summary:
1. Optical zoom uses lenses to zoom in on the image before the sensor captures it.
2. Digital zoom uses the processor to magnify the image after the sensor captures it.
3. Optical zoom preserves the crispness and detail of the image while digital zoom tends to interpolate a lot of the data.
4. Cameras with optical zoom are generally more expensive and bigger than cameras that only have digital zoom.
5. Constant adjusting of the zoom level in a camera with optical zoom might drain the battery a little bit faster.
good post. Sir What about optical zoom vs. resolution ?
ReplyDeleteRealizing that digital zoom is not really a good thing because it negatively affects image quality, camera manufacturers have introduced a new type of digital zoom variously called “Smart Zoom” (Sony), “Safe Zoom” (Canon) and “Intelligent Zoom” (Panasonic and others). Smart/Safe/Intelligent Zoom (let’s collectively called them Intelligent Zoom, or iZoom for short) can be viewed as an “ethical” digital zoom which avoids interpolating the image and so avoid degrading image quality. iZoom works only if you select an image size smaller than the full available image size. So, for example, if your digital camera is capable of producing a 12MP image, Smart Zoom is available only if you select to save your images as 7MP or less. In other words, with this particular type of digital zoom, the MP resolution decreases as you ‘zoom’ — in other words you are just cropping the center of the image (without enlarging and interpolating back to the original resolution).
ReplyDeleteI call iZoom “ethical digital zoom” because it is not made available at full image size — this would cause image degradation. The smaller you elect to save your image, the more iZoom power you have available (folks, you’re basically just cropping the image without re-enlarging, which you can also do at any time in post-processing).
ReplyDeleteSo, our recommendation still holds. If you want zoom power, only optical zoom matters! iZoom is the better form of digital zoom, but what you gain in simulated zoom power (again, you’re just cropping), you lose in image size. There’s no free lunch.
Another advantage of digital zoom:
ReplyDeleteI take pictures of birds and I have found that autofocus fails in a lot of situations especially when the subject is small in the frame. (I use autofocus because I often only have 2 or 3 seconds to get the shot before the bird flies away.) But if I increase the zoom into the digital range, so that the subject fills more of the frame, the autofocus works better. The net result is that I now almost always zoom out to the max optical + digital and end up with better pictures of birds, because a grainy in-focus shot is better than an out-of-focus hi-res shot.
So if your subject is small in the frame, I would strongly recommend using max digital zoom to increase your chances of getting an in-focus shot.
Perhaps the focusing technology will someday improve where I can select a pinpoint and it will get lock on to it. But for right now its not there.
Hey Guys !
ReplyDeleteUSA Fresh & Verified SSN Leads along with DL Number, AVAILABLE with 99.9% connectivity
All Leads have genuine & valid information.
**HEADERS IN LEADS**
First Name | Last Name | SSN | Dob | DL Number | Address | City | State | Zip | Phone Number | Account Number | Bank Name | Employee Details | IP Address
*Price for SSN lead $2
*You can ask for sample before any deal
*If anyone buy in bulk, we can negotiate
*Sampling is just for serious buyers
==>ACTIVE, FRESH CC & CVV FULLZ AVAILABLE<==
->$5 PER EACH
->Hope for the long term deal
->Interested buyers will be welcome
**Contact 24/7**
Whatsapp > +923172721122
Email > leads.sellers1212@gmail.com
Telegram > @leadsupplier
ICQ > 752822040
Airtight Windows Systems offers our clients a personal service and attention to detail, while ensuring a top quality product and installation service. We have over 13 years’ experience working with homeowners in the Dublin area.
ReplyDeleteAn Apartment Entry Systems is an easy, affordable way to enhance both the security and convenience of your apartment complex, allowing residents and visitors to easily communicate with each other. Integrated with a convenient access control system, an apartment entry system will allow visitors, deliveries and other personnel into the building painless.
ReplyDeleteWe offer professional installation services so that your security is complete. Having proper
ReplyDeleteCCTV camera installation in Karachi is just as important as buying the right camera settings.
UnikCCTV offer best Security and Surveillance system which are offer in market right now. These systems can range from wireless home security cameras to sophisticated alarm systems that notify law enforcement at the first sign of trouble. This will ensures safety of your good and services. Our online store packed with different kind of security systems like contactless door lock, intercom with inbuild video camera, microphone & screen, and many more.
ReplyDeleteIf you want to learn more about work from home monitoring software, then this is the right site for you. here you get such a piece of informative information.
ReplyDeleteVisit: Work From Home monitoring software
Top 10 Casino Apps - Casinoworld
ReplyDeleteIn this section we'll walk you deccasino through our selection of top casino apps, and hopefully you'll 온라인카지노 find plenty of useful information on https://tricktactoe.com/ the top How https://shootercasino.com/emperor-casino/ do you use PayPal?Are wooricasinos.info there any deposit bonuses at your casino?