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P: Which is the compression algorithm and that advantages it has? R: We use Motion JPEG like international standard. First of all, it uses a codification of frames fixed instead of frames adjacent like MPEG1,2,4 and H.263. Therefore, it offers a clear image of video without disfigurements in the low bandwidth. Secondly, JPEG has a good flexibility with other software of applications. Thanks to their nature of international standard, many software programmers use JPEG in their applications. And finally, but not less important, JPEG requires a rate of low decoding. In this way, manifolds video channels can be decoded and be visionar of efficient way with a little powerful PC. However, other algorithms have demanding requirements of the system of the PC to secure a yield similar to the one of JPEG.
P: Why it is the Java way so important Applet? R: Java Applet is designed to work with any operating system like MS Windows, Unix, Linux and OS/2. Nevertheless, it works with JVM (Java Virtual Machine) that admits the majority of the navigators of Internet and the majority to it of the operating systems. However, in some cases the version of the JVM is different based on the operating system. As long as the user has the suitable version of JVM in the PC where he is going to visionar the images, he will be able to receive and to visualize the images in direct coming from the FlexWATCH servants in any operating system. If its camera or servant of video does not admit the Java way Applet, will have to verify the JVM version and to consult with its local distributer so that the JVM version is correct and the compatible one with the PC of the user. In this way of it will be able to load the suitable version of JVM in the visualization PC. If the image of in time real video is going to be visionada by usuary manifolds or by users without determining, it is difficult to guarantee a constant access to the video servant. This is the reason for which the Java way Applet is a factor so important to consider.
P: Which are the most remarkable characteristics of the servants of FlexWATCH video? R: The main characteristics could be summarized of the following way:
- Java way applet:
This is a very important characteristic since any device type palm or wireless equipment admits the function of navigation by Internet. If it admits ActiveX or a software plug-in, in the PC of visualization or device type palm (PDA) it is necessary to use some propietary application program to review and to visionar the images of video in direct.
- Software FW-Voyager:
The users can see a remote location through any navigator of Internet and without needing installing no additional software. Nevertheless, we offer our software FW-Voyager like a useful and simple personal tool of recording of digital video DVR). FW-Voyager is a tool to record realtime images. The recording is activated by the detection of certain events like time intervals of recording, detection of movement, by sensor of alarm, besides recording additional manual of photographies and other options. Considering all the previous one, it is not necessary that it is 24 hours in front of the screen of his computer, but will only have to visionar the recordings of events or those intervals specified by the user to record and to visionar next.
- Motion JPEG:
FlexWATCH uses a hardware Motion JPEG (Method of compression of international image) of 30 fps in real time.
- Yield:
All the FlexWATCH systems are able to provide 25 fps in real time (PAL).
P: In what of one is different the servants from FlexWATCH video webcam? R: The majority of webcams is cameras of sensor CMOS through port USB and whose price oscillates between 35-70 Euros. It receives the name of camera Web or webcam and requires of a computer and some type of propietary application program to be able to visualize the remote location through her. Nevertheless, the FlexWATCH systems have a servant of Web of video integrated with their own direction IP and to which can be acceded through any navigator of standard Internet like MS Internet Explorer or Netscape Navigator.
P: A servant of video based on network HTTP in front of a servant of video based on a networking. R: Normally, when is spoken of a video Web server, distinction between the systems based on HTTP and the systems based on socket is not made. The reason is that remote clients PC use the same navigator of Internet for the remote access and the visualization. Nevertheless, a great difference in its application exists. Protocol HTTP reunites the hardware and protocol stacks TCP/IP. Therefore, if a client accedes to a system based on HTTP, the response time is slower than the one of a system based on socket that only deals with TCP/IP batteries. The majority of the Web servers of video in network who use software ActiveX or plug-in is based on systems type socket. Thus, the response time (for example, the rate of decoding of frames) is enough more express than with the systems based on HTTP. Nevertheless, the systems type socket require a concrete program so that it works with any operating system. The servants of video based on HTTP allow the developers of application programs to use an interface cgi, which is very simple to create with a publishing program of Web. However, with a program based on socket, the developer must use a file library (p.ej., archives DLL in Windows) to create the application program. The series of FlexWATCH servants admits so much the protocols HTTP (way Applet, FW-Voyager way) and the Socket protocol (FW-manager).
P: Which is the main difference between the JPEG and other systems of compression of images H.263/MPEG? R: First of all, MJPEG is much more simple and small that other systems for their computation in the PC. For this reason, if a propietary software of management in the point of central visualization is used, MJPEG provides a yield better than other systems to administer to more Web servers of video from a unique PC of control. Secondly, FlexWATCH follows system HTTP, although the majority of the other systems uses systems socket that only can work in operating systems Windows. FlexWATCH is directly it jeopardize with the compatibility with equipment of other existing systems like the devices type palm and other operating systems like Unix, MacOS, etc. In addition, MJPEG are international a standard file that offers many advantages when the user uses for example the flow of images to publish the images and conversion of format.
P: Which is the real rate of visualization? R: FlexWATCH provides a rate of visualization of 30 fps in real time. The speed of visualization that is translated in a real rate of decoding in a PC having used a navigator of Internet or any other software. Nevertheless, factors exist that affect of global way the yield of the system. First of all, if a navigator of Internet like MS Explorer or Netscape Navigator uses, he can obtain 30fps (itself a video channel is activated). Secondly, although FlexWATCH even can transmit 30 fps, the real rate of visualization will depend on the bandwidth of the network and the yield on the PC client.
P: What types of resolutions of image admits the FlexWATCH R: FlexWATCH admits 4 different resolutions of image such as 704 xs 576, 704 xs 288, 352 xs 288 and 176 xs 144 (in the PAL). These resolutions are the used most frequent resolutions in the video visualization. Nevertheless, it can fit the resolution of the image if it needs to extend or to reduce the image.
P: Which is the habitual rate of the bit stream of each frame? R: If 320x240 uses the way, the size of the bit stream of each frame oscillates between 4Kbytes to 8Kbytes. If it uses the highest resolution (720x480), the size of the bit stream will oscillate between 15Kbytes and 25Kbytes. On the other hand, for the resolution of lower image, the 3 size is of 2 and Kbytes. Therefore, based on his application, it can anticipate the real yield and it fits to the resolution and quality of the image.
P: If I connect 4 entrances of cameras CCD for a video servant, I will be able to obtain a rate of 15 frames per second (fps) of each port of video? R: No, 25fps or 30fps is the speed for a single port of video in the local network. If there are other two entrances of video connected the servant, rate 25 fps would have to be divided enters the number of active ports of video. In theory, the total rate of frames that can receive a PC client is of 12 fps when there are two connected entrances of video, although the maximum rate of frames is 25fps~30fps through a unique port of video. If the video servant is connected via Internet, the real rate of frames will be inferior to the rate of frames in the local network and will depend on the bandwidth of the network.
P: How many simultaneous access can take place at the most? R: In a local network (LAN) of high speed, FlexWATCH can admit up to 30 clients. Nevertheless, through a network for Internet like dedicated ADSL/cable/línea/etc., the real number of clients increases (p.ej. 100 clients), at the same time as the speed of answer falls. It is evident that there is a degradation of the yield of the equipment based on the number of clients.
P: My Supplier on watch of Internet (ISP) has blocked port HTTP 80. Exists some possibility of using this port? If it is thus, how it is possible to be done? R: FlexWATCH admits the option of port HTTP. For this reason, it can change port HTTP from port 80 to another number of port that wishes to use. Simply it will have to connect servant Dr video and to change the number of the port. It does not need to change to the page Web of the video servant to use port HTTP 80 blocked by the supplier of services of Internet (ISP).
P: If I use a connection ADSL or a modem by cable with a dynamic direction IP, I can have access to the servant of FlexWATCH video from Internet? R: Yes. We offer a special service for the users with dynamic directions IP. This service acts as door of connection for the FlexWATCH servant. Of this form the unique thing that it must do is to register itself in service AOIP and it already can connect with his servant from any part just by to enter the page of service AOIP and to look for his Flexwatch servant. It visits our page of service AOIP in the connection
P: If desire to use a Static IP, what I must do? R: In order to use a FlexWATCH with a Static IP the unique thing that there is to do it is to introduce the value of this IP in the bar of directions of his navigator of Internet. If in addition it wants to use two or but Flexwatch either or has an installed Web server, it must use function NAT of router of ADSL and cable modem to redirigir requests from the different ports from deprived direction IP of the corresponding equipment. It consults with his supplier like doing this.
P: I can use my servant of video with fire-guards (firewall) in some location? R: Yes, it can install his Web server of video and FlexWATCH camera behind fire-guards (firewall). Nevertheless, it will be necessary to form his NAT (Address translation of network) and abrir port HTTP.
P: Admits FlexWATCH a modem interface? If it is thus, how can be installed and be used it? R: Yes. FlexWATCH provides an interface RS-232 for the connection by modem. In fact, in some cases it is very difficult to identify all the types of modem. However, FlexWATCH does not make distinction between the modems. The clients can use any type of modem to settle down the call. Simply will have to connect the external modem to port RS-232 of the FlexWATCH servant and to establish the call through the function of marking of the PC. Next it will have abrir its navigator of Internet and to write direction IP by defect so that the modem connects her to see in direct the video images. If the way is used Dial out through a flat tariff of Internet, can cause that its FlexWATCH calls to its supplier of services of Internet (ISP) by time intervals. If his Web server of FlexWATCH video is registered in a servant AOIP, will be able to visionar the images through this servant. If he wishes more information, he póngase in contact with his local distributer or our service of support.
P: Can be personalized the page Web or be done a direct connection of images in our Web site? R: Yes. We provide a flash memory space to enclose some customized pages HTML and also in its own page can create a connection with the images of its Web server of FlexWATCH video Web. Póngase in contact with its local distributer or unloads the technical document in the pages of technical support.
P: I use a dynamic IP and my FlexWATCH is registered in a service AOIP. I can add to a connection of transmission of video to our page Web? R: Yes, it can connect and create a direct connection in of video from the Web server FlexWATCH connected to a dynamic and registered direction IP in service AOIP. It unloads the technical document to obtain data exceeds how to create this connection. It consults the page of technical support.
P: I can record the images received in direct from the FlexWATCH and visionar them later? R: It can record the images of video in real time using the software FW-Voyager that can unload of totally gratuitous way. Software FW-Voyager provides several options to him outposts to record the images captured in direct through time intervals, detection of movement, activation by alarm as well as recording of firings of images and recording of forced image. FlexWATCH provides the program of visualization of FlexWATCH that allows him to reproduce the images recorded at the moment that wishes. It uses plug-in and an equipment DVR (Recorder of digital video).
P: Can be controlled cameras with connected movement and zoom lens to the FlexWATCH from Internet? R: Yes, FlexWATCH admits the port of communication RS232/485 with another device PTZ. At the moment, they are the majority of the protocols but known and extended com Pelco- “P”, SONY, Panasonic, Kalatel Cyber tames, Vicon, Samsung, and other marks. Other marks can be added when they are necessary.
P: I directly have a device PTZ of a noncompatible manufacturer with FlexWATCH . There is some possibility of installing and of controlling my device PTZ? R: Yes, we offer a way of creation of commandos for PTZ that allows to send transparent data to their device PTZ through their Web server of FlexWATCH video . In this case, his own Control Panel cgi in the video servant will have to create. consults the corresponding manual of user of its FlexWATCH or technical notes if it wishes to obtain more data on this option.
P: I would like to form my servant of video so that she sends images to a servant FTP or a direction of electronic mail. It is possible? R: Yes, it can form his servant to send images of video in direct to his servant FTP. The FlexWATCH servants allow him to send to site FTP the images of video at intervals programmed or by activation of the alarm entrance. FlexWATCH also can send a message of electronic mail with attached images if some event is detected.
P: Our company of dedicates to the development of software. It has some bookstore SDK? R: Yes. we include a Win socket API and an interface HTTP of cgi for application developer of programs. Their manual and its source codes of test will indicate to him how to manage their Web server of FlexWATCH video .
P: It would be interested in visionar the images through my device type PDA or PC of pocket. It is possible? R: The Java way script that has its FlexWATCH servant is compatible with the majority of devices PDA, therefore it will allow him to visualize in real time the images in direct without needing installing no special software in his PC of pocket. Únicamante will have to immediately add “/pda2” after direction IP of its servant of FlexWATCH video , for example, < 192.168.0.157 /pda2>. If its device PDA has JVM (Virtual Java machine), can visionar the images through Java way Applet when it is connected his servant of video.
P: It is possible to be controlled manifolds simultaneously units of FlexWATCH in a location? R: Yes. It can visualize and record simultaneously the sources of video of up to 36 channels of video through the local network (LAN) or broadband network WAN (DSL/Cable) using the propietary program FlexWATCH to manager. If it wishes to obtain more data on FW-Manager, consults the FW-Manager page or it póngase in contact with if the distributing premises.
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P: Can be connected the FlexWATCH to a wireless modem? R: Yes. The majority of the wireless modems supports the interface of communications RS-232. If there is available a communication protocol, we can provide it in a period of several days. |