DIGITAL CCTV A Security Professional’s Guide phần 3 docx

... Netherlands ● SAI—Standards Australia International ● SANZ—Standards Association of New Zealand, New Zealand ● NSF—Norges Standardiseringsforbund, Norway ● DS—Dansk Standard, Denmark The ... have changed are compressed and transmitted. 62 Digital CCTV 1. Vector quantization is a lossy compression that looks at an array of data and generalizes what it sees. Redundant data is comp...

Ngày tải lên: 12/08/2014, 16:21

... increase the amount of data that can be transferred over analog cellular systems. TDMA is also the access technique used in the European digital standard (GSM) and the Japanese digital standard, ... twisted-pair wire) ● 100BASE-FX (a two-strand optical fi ber cable) There is a vast scope of applications, and the various methods are mutating and evolving at a rapid pace. 132 Dig...

Ngày tải lên: 12/08/2014, 16:21

... 225 Index 233 v a tape or a record. With all of the advancements available in digital technology, it is not as “perfect” as analog video and does present a variety of new problems in transmission and ... TOKYO Butterworth-Heinemann is an imprint of Elsevier A Security Professional’s Guide 4 Digital CCTV are created when electrically charged particles, such as electrons,...

Ngày tải lên: 12/08/2014, 16:21

... what they all mean. This brings us around to the question “How digital is it?” It is possible to have analog cameras and monitors, use coaxial cable, and have a DVR, and call that a digital ... advantage here is that a trade off can be made between fi le size and output image quality. This capability allows the image quality to be adjusted to an acceptable condition as the appli...

Ngày tải lên: 12/08/2014, 16:21

... video data captured. A networked digital video management system is a perfect example of how to add camera “eyes” to an airport, or any facility, and automate the alarm triggers on the data captured ... footage from inside and outside, store operational data, and generally improve the quality and safety of public transportation. The Santa Clara Valley Transportation Authority (VTA) o...

Ngày tải lên: 12/08/2014, 16:21

... the alarm location, assess the information, and take appropriate actions to alleviate the situation. Unnecessary calls to law enforcement are virtually eliminated. Another distinct advantage ... false alarm dilemma. False alarm fi nes can range from $20 to $250 or more. If false alarm fi nes are affecting a company’s profi tability, remote video alarm verifi cation can help dramatically r...

Ngày tải lên: 12/08/2014, 16:21

... Monterey, California can now access real-time pictures and data 212 Digital CCTV years, manufacturing plants have been automating their produc- tion facilities at an increasing rate, augmenting ... or general broadcast. Chroma Level: relating to the amount of saturation and hue at a particular point of an image. Chrominance: color information contained in a video signal sepa- rate...

Ngày tải lên: 12/08/2014, 16:21

... important to understand that you can convert an analog signal to representative numbers and then convert it back again to an analog signal that is an accu- rate representation of the original ... por- tions of an image (white areas). There are many levels of gray within the overall grayscale, ranging from slightly gray and almost white to very dark charcoal colors that are nearly black. T...

Ngày tải lên: 27/06/2014, 11:20

... use byte accesses. int readint_little(char *data) { int a0 ,a1 ,a2 ,a3 ; a0 = *(data++); a1 = *(data++); a2 = *(data++); a3 = *(data++); return a0 | (a1 << 8) | (a2 << 16) | (a3 << ... S (A) S (A) S (A) B (A) STRB 8 X X X B (A) LDRH 16 0 0 B (A) B (A+ 1) LDRSH 16 S (A) S (A) B (A) B (A+ 1) STRH 16 X X B (A) B (A+ 1) LDR/STR 32 B (A) B (A+ 1) B (A+ 2) B (A+ 3) Note...

Ngày tải lên: 09/08/2014, 12:22

... modem may actu- ally be placing a call to as far away as Chad, Madagascar, or other countries, and the computer user may be billed for an international call. Some Web sites may be advertised as ... types of impact that a malicious code attack has on an organization. But understanding the costs associated with malicious code attacks and the impact that attacks can have on their organiza-...

Ngày tải lên: 04/06/2014, 13:21