Tag: HDTV

With so many choices of surveillance cameras in the market, it is easy for a consumer to get overwhelmed in choosing the best security camera for their system needs. No matter what type of surveillance application you are installing, there are some basic things that all consumers should consider in order to make a good choice. This will be the first of a series of articles to help guide a non-technical person that is researching the purchase of a surveillance system. The main topic for this first article of the series is security camera resolution.

It is important to know what resolution means when shopping for a surveillance camera. CCTV cameras have a resolution range from 330 TVL (television lines) to 600 TVL. For color resolution, CCTV cameras max out at 560 lines, however you can get black and white CCTV surveillance cameras in 600 TVL. IP security cameras are now available in much higher resolution, up to 5 megapixels. What does this mean?

In the United States, regular TV transmission (not high definition) displays 480 lines of resolution. So it is possible to purchase CCTV cameras that can record equal to or greater resolution than TV. Obviously the higher the resolution of the camera that you choose, the more detail you will see in your surveillance video. High definition television (HDTV) displays either 1080 or 720 lines of resolution depending on the channel and the type of HDTV that you have. In order to get higher resolution from surveillance cameras, the only choice is IP based megapixel cameras, which connect over an IP network instead of a closed circuit. Generally, IP mega-pixel cameras are much more expensive than CCTV cameras. For high end applications that demand ultra-high resolution, megapixel cameras can capture surveillance video at more than twice the resolution of high definition television.

Some people that are shopping for a security camera are unrealistic (because of their lack of experience) about what a surveillance camera can capture (especially CCTV cameras). I will go into more detail about lens types and sizes in the next article in this series. I must touch on it briefly now as it is so closely related to resolution. For this example, we will use a 3.6mm lens which gives you about a 90 degree field of view outward from the lens. Some people think that if you take a 480 lines of resolution camera with a 3.6mm lens that you will be able to get a clear picture both of an object that is 20 feet away and an object that is 80 feet away. This is not true. While the 3.6mm lens will easily pick up the object in detail at 20 feet away, it cannot pick it up at 80 feet away also with the same 3.6mm lens. In order to pick up the object at the further distance, you have to either use a larger lens that would make the image appear more close up or use a high end megapixel camera that would allow the operator to zoom in digitally without distorting the picture. Digital zoom is possible with high end megapixel cameras, but not with normal resolution CCTV cameras. Because of the huge price difference between CCTV and IP mega-pixel cameras, a lot of times it makes sense to add additional CCTV cameras instead of upgrading to megapixel cameras. This will lead us into the next article which will be about understanding and choosing the right camera lens.

Pocket camcorder Kodak’s Z18 is new updated version to the Z16, smaller and maintains the original color designThere is also an added feature of a 2.5 inch display along with microphone jacks for sound checks and more listening pleasure.Kodak’s Z18 camera comes with an SD/SDHC socket and will accommodate some larger SD cards up to 32-GB

Description:

The Kodak Z18 is small enough for a pocket fit and can capture your shoot in stunning HD video 1080p and state of the art integrated image stabilization.. You can then relax and replay all the action on HDTV and also upload to YouTube.

Product Features
” Convenient to take everywhere and take full HD videos.Create sharper videos with little or no blur due to enhanced image stability.
” You can also take great widescreen HD still pictures.
” Kodak Z18 can be used with any PC and MAC operating systems (with Apple iLife Suite of products.)
” Compatible with iTunes for syncing with Apple TV, iPhone and iPod Devices
” Capture your most cherished experience with smart tracking technology.

Download from (c) Dreamstime.com
” View more details and accurate colors with low lightingRecord audio in stereo from the external microphone jacks
” View in big screen right out of the gate using included HDMI cable.
” Record from a distance or play back on your TV with ease with available remote control
” Beautiful architecture, ultra compact and a range of colors
* View in big screen right out of the gate using included HDMI cable. * Stunning architecture, very compact and comes in 3 colors.

Click Here to View the Kodak Z18 Camcorder.

Video Source: Youtube

Digital tv (DTV) will be the transmission associated with audio and video by electronic digital signs, within contrast towards the analogue indicators utilized by analog Tv set. Many countries tend to be exchanging broadcast analogue tv set along with electronic digital television to permit some other makes use of of the television stereo range.

Digital television supports a variety of picture formats defined by the broadcast television methods which are a mix of size, aspect proportion (thickness in order to peak ratio).

With digital terrestrial tv set (DTV) transmitting, the range of types may be broadly split up into two classes: high definition tv set (HDTV) for that transmission of high-definition video clip and standard-definition tv set (SDTV). These phrases alone aren’t very specific, and many delicate intermediate circumstances can be found.

One associated with several various HDTV platforms which can be transmitted more than DTV will be: 1280 ? 720 pixels within intensifying check function (shortened 720p) or even 1920 ? 1080 pixels in interlaced video clip setting (1080i). Each one of these utilizes a Sixteen:Being unfaithful factor proportion. (A few tvs are capable of obtaining a great HD decision regarding 1920 ? 1080 in a 60 Hertz modern check out frame fee – known as 1080p.) HDTV cannot be sent over current analog television channels as a result of funnel ability concerns.

Standard definition Tv set (SDTV), in comparison, may use one of several various types taking the type of different aspect percentages depending on the engineering utilized in the nation regarding transmit. Regarding 4:Three aspect-ratio broadcasts, the particular 640 ? 480 format is found in NTSC nations around the world, although 720 ? 576 is utilized inside PAL nations. For 16:9 shows, the 704 ? 480 structure is utilized in NTSC countries, although 720 ? 576 is actually used within PAL nations. Nonetheless, broadcasters may choose to decrease these kinds of resolutions to save lots of bandwith (e.grams., several DVB-T channels in the United Kingdom use a side to side decision regarding 544 or even 704 pixels per line).[1]

Each commercial transmission terrestrial television DTV funnel within The united states is actually allowed to end up being broadcast with a bit price as much as 20 megabits per second. Nevertheless, the particular broadcaster does not need to make use of this whole bandwidth first transmit channel. As an alternative the send out can use the channel to include PSIP and may furthermore subdivide throughout several video clip subchannels (aka feeds) of various quality and also data compresion charges, including non-video datacasting providers that allow one-way high-bandwidth streaming of information in order to computers like Nationwide Datacast.

A broadcaster may opt to make use of a standard-definition (SDTV) digital signal rather of an High definition tv signal, simply because existing convention permits the actual data transfer of a DTV funnel (or “multiplex”) to be subdivided directly into numerous digital subchannels, (just like what the majority of Radio channels provide along with High definition Stereo), supplying multiple nourishes regarding entirely various tv programming for a passing fancy channel. This ability to offer whether solitary HDTV give food to or perhaps multiple lower-resolution nourishes is frequently referred to as disbursing a person’s “tad budget” or even multicasting. This may be organized automatically, using the record multiplexer (or perhaps “stat-mux”). With a few implementations, resolution could be less immediately limited by data transfer; for illustration within DVB-T, broadcasters can decide on several different modulation schemes, providing them with the option to reduce the transmitting bitrate to make reception less difficult for more remote or even cell visitors.

Changes in signal wedding party from aspects such as degrading antenna cable connections or perhaps transforming weather conditions might gradually reduce the top quality associated with analog TV. The character of digital TV results in a flawlessly decodable video clip at first, before the receiving products begins collecting interference that overpowers the required signal or if the particular transmission is simply too fragile in order to decode. A few gear will demonstrate a garbled image along with significant damage, whilst other products might go directly from flawlessly decodable video clip to be able to absolutely no video in any way or even lock up. This trend is called the electronic digital cliff impact.

For distant places, remote channels that, as analogue indicators, had been earlier workable in a snowy and also changed express may possibly, because digital indicators, end up being flawlessly decodable or may become completely unavailable. In areas where sending antennas are located about mountain tops, visitors who’re as well close to the transmitter could find reception hard or impossible because the strongest area of the send out signal goes by above all of them. Using higher frequencies will add to these problems, specifically in times when an obvious line-of-sight in the obtaining antenna to the transmitter isn’t available.

Electronic tv set (DTV) could be the transmission regarding video and audio simply by digital signals, in contrast to the analogue signals made use of by analog TV. Many nations tend to be updating broadcast analogue television set along with a digital telly permitting some other utilizes from the television stereo array with assistance of digital tv antennas.