Meow technologies provide Biometric Security Products , Systems Biometric Access Control Devices and other Biometric Products. Meow Technologies provides high quality and cost effectiveAttendance Systems, Biometric Readers, Attendance Machine, Biometric Locks, Fingerprint Access, Biometric Attendance, Biometric Computer Security, Fingerprint Readers, Biometric Security Systems, Door Access Control, Fingerprint Scanners, Biometrics Devices, Biometrics System, Fingerprint Recognition System, Biometric Security Products, Biometric Access Control Devices, Biometric Sensors, Face Biometric, Biometric Control, Biometric Scanners, Fingerprint Time Attendance Device, Fire Security Alarm System,CCTV Camera,EPABX,Intercom,GPS navigator, and more on time.We supply Biometric in kerala Meow Technologies provides wide range of services with Fingerprint Recognition System to assist its customers in building custom solutions that tightly fit their business needs. we are an innovative, responsive and entrepreneurial organization. Our business environment is constantly changing with modern Biometric Security Systemsand we have a creative and innovative approach that leads to efficient Biometrics Devices with breakthrough performance.( : MeowTechnologies CCTV, CCTV KERALA, SECURITY SYSTEMS, SECURITY CAMERA, CAMERA KERALA, SECURITY THRISSUR, SECURITY KERALA, , HOME AUTOMATION KERALA, INTRUSION ALARMS KERALA, IP CAMERA KERALA,Essl Kerala,ESSL Channel Partner,CCTV thrissur,CCTV cochin,CCTV ,Web designing, web solution,Search engine optimization,Kuri software,Chitty company software)
Thursday, 28 April 2011
Meow Technologies
Address
Corporate Office
Opp CMI Provincial House
Patturaikkal,
Thrissur - 680 022,
Kerala, India
Ph:+91-0487-6417970,6538141
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www.meowtechnologies.co.in
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Wednesday, 27 April 2011
BDXL
BDXL
The BDXL format supports 100GB and 128GB write-once discs and 100GB rewritable discs for commercial applications. It was defined in June 2010.
Sony launches six new DVRs, all write to BDXL and play back in 3D
Sony launches six new DVRs, all write to BDXL and play back in 3D
Monday, 25 April 2011
Tuesday, 19 April 2011
Infrared Security Camera
An infrared security camera has infrared LED lighting (light from a different region of the electromagnetic spectrum than we normally use to see) installed around the outside of the lens of the camera. This lighting allows the camera to capture a good image in no light at all. With a little bit of light (called low light) the infrared camera can capture a picture that looks just like daytime. People use infrared security cameras for businesses that have the lights out at night (in case of break-ins). Or for outside, nighttime viewing. Keep in mind that even at nightime there is a normally some light from the moon, stars, or street lights.Infrared cameras are often called "Night Vision" cameras because they can 'see' at night. However, do not confuse "Night Vision" with "Day / Night Cameras". Day / Night cameras do not have infrared lights built in. More about those types of cameras below.
Infrared security cameras will provide a color picture while the light is good. When it gets dark, the camera will switch to infrared mode and illuminate it's built-in infrared LEDs. In infrared mode the image is captured in black and white - this is true of all infrared cameras. The level of light required to capture a good picture is referred to as a camera's lux, the lower the lux the better the camera can see in low light. For example a camera with 0.003 lux is better than a camera with 0.2 lux. Infrared cameras are considered to be 0.0 lux in infrared mode - in other words they can 'see' with no light at all.
Infrared cameras are also compared by how far they can see in total darkness. This is generally a result of how many infrared LEDs are built into the camera. Our 600 Line Color Outdoor Infrared Varifocal Bullet Camera can see up to 125ft. with no light at all!
If you are going to use an infrared camera outdoors, its best to use a outdoor weatherproof bullet style camera. This is because if you use an indoor infrared camera and need to put it in an outdoor housing, sometimes the infrared light reflects off the glass of the housing. Some people get acceptable results if the camera is absolutely flush up to the glass thereby reducing the glare. An alternative solution is to use a day / night camera which has an extra sensitive imaging chip that allows it to capture a good picture in low light situations without using infrared lighting. This works well for example if there are street lights outside or an exterior light that can be left on at night. Keep in mind that cameras without infrared lighting will not capture an image with zero light. The other issue to consider is that infrared cameras require more power (more amperage). The power requirements are provided in the specs for each camera.
Saturday, 16 April 2011
Optimization of CCTV camera settings
Optimization of CCTV camera settings
Introduction
When selecting a model of a camera we are usually interested in possibility of adjustments to various operating conditions. Of course, more advanced models have more capabilities, simpler devices keep some parameters fixed.
However, in order to be able to take full advantage of the adjustments, please refer to their technical data and user manuals. We here are discussing a number of typical settings having an impact on the quality of the image, both positive and negative. Such knowledge will help you achieve the best practical results of the camera operation.
The impact of changes in camera settings will be demonstrated for ACTI cameras, but the rules apply to other types of cameras from different manufacturers.
Resolution
The main parameter which describes image quality is its resolution. It says about how many points the whole image consists of. Of course, the larger the resolution, the better the image quality or larger area that can be monitored. In contrast, it creates a greater demand for bandwidth and increases the volume of recorded material. Typical resolutions: CIF (320 x 240), VGA (640 x 480), D1 (720 x 576), SXGA (1280 x 1024), UXGA (1600 x 1200).
Comparison of VGA and SXGA resolutions
Frame rate
The parameter specifies how many frames are generated/transmitted in a unit of time - the more frames the smoother image. PAL television system has adopted 25 frames per second (fps), which is regarded as completely smooth image. However, due to bandwidth restrictions, video surveillance systems often use in practice frame rates 5 to 10 fps, which are quite sufficient. Of course, there are specific cases that require to use high frame rates, even 100 fps, but such solutions are not popular. Lower frame rates are used to control crowds, higher (25 fps) to monitor the behavior of individuals, the highest to record quick processes (e.g. crash tests).
Compression
A very important feature of IP CCTV camera is the kind of video compression. It shows technological level of the camera. The better compression, the lower bandwidth requirements - at the same level of subjective quality. Popular video compression formats are MJPEG (in fact linking consecutive frames compressed as JPEG files) and MPEG-4 (creating complete images one every several frames and refreshing them till the next complete frame only by the changes). The latest and most advanced compression method is H.264 (MPEG-4 Part 10, or MPEG-4 AVC), a block-oriented motion-compensation-based codec standard. It contains a number of new features that allow it to compress video much more effectively than the previous standards, such as multi-picture inter-picture prediction and lossless macro-block coding. In practice, the "gain" of H.264 in comparison with MPEG-4 ASP (bandwidth, file size, or transmission time) is about 30%.
Comparison of popular compression formats at a given quality
Screenshot of video settings menu of ACTi cameras
Back Light Compensation (BLC)
This function is the ability of a camera to compensate the brightness of the subjects with a large amount of background light that would make it practically impossible to see any details of the subjects. Backlight compensation consists in adjusting the gain of the camera to improve exposure of the subjects that are in front of a bright light source. It allows to identify the foreground. Unfortunately, the background also becomes even brighter.
 |  |
BLC off | BLC on |
Wide Dynamic Range (WDR)
This feature of image sensors has been introduced relatively recently. It extends the action of BLC. Due to operation based on the analysis of exposures of single cells, at the same time it can brighten dark elements and darken too bright ones. The image processed this way allows to clearly see details both in the foreground and bright background.
WDR on
White Balance (WB)
This is a function that influences representation by the camera all the colors, in reference to "white" color. In automatic mode, the reference point for white is the brightest point in the image. Because the camera often monitors an area where the brightest point isn't really "white", the colors in the image can be far from those we consider "real". The solution is to preset colors corresponding to natural or artificial lighting, as well as to save camera settings for a "white" pattern.
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Correct white balance | Incorrect white balance |
 |  |
AGC at 10/255 | AGC at 100/255 |
Automatic Electronic Shutter (AES)
The possibility of extending the time of opening the shutter allows to increase the exposure of the image sensor. This is a very useful feature in areas with low light, since a longer exposure time results in a brighter image. However, it is not free from drawbacks. The problem is blurring of moving parts of the image. This is due to the fact that the objects move significantly during the period of opening the shutter, being reproduced all the time. Another important limitation is the frame speed of the camera - the opening time cannot exceed the frame time.
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Short shutter interval | Long shutter interval |
Sharpness
JPEG compression has a disadvantage - it generates blocks with undesirable texture. This causes strange patterns in the picture. The effect is particularly visible in dark scenes. The solution to this problem is to reduce the sharpness of the image. Reducing this parameter, you can smooth out the "noise" caused by the compression. Of course, too big reduction would result in a blurred image.
 |  |
Sharpness at 200/255 | Sharpness at 100/255 |
Screenshot of Camera Setup in ACTi cameras
Summary
Modern IP cameras offer many options for adjusting to operating conditions. The mechanisms used in the devices allow them to work in almost all environments. The image quality obtained depends also on the skills of the installer. Please note that the manufacturer presets the parameters to some default conditions that are typical for a specific model. In actual conditions the installer can improve the picture quality. However, it happens in some cases that inexperienced installer worsens the image from the camera to a degree that he may suspect the device is broken. So, if the default settings are satisfactory, there is no need to "experiment". In any case, the changes of the parameters should be made very carefully.
What is CCD chip?
| A CCD(charge coupled device) consists of several hundred thousand individual picture elements (pixels) on a tiny 1/2", 1/3", or 1/4" chip. Each pixel responds to light falling on it by storing a tiny charge of electricity. The pixels are arranged on a precise grid, with vertical and horizontal transfer registers carrying the signals to the camera's video processing circuitry. This transfer of signals occurs sixty times per second. The 1/3" CCD chip is the most widely used sensor format these days; its size is 5.5mm (diagonal), 4.4mm (horizontal) and 3.3mm (vertical). The 1/4" sensor format, recently being used in color cameras, is 4mm (diagonal), 3.2mm (horizontal) and 2.4mm (vertical). The CCD chip's electronic shutter plays a major role in making a fantastic and reliable picture. * CCD (charge coupled device) and CMOS (complementary metal oxide semiconductor) image sensors are two different technologies for capturing images digitally. Each has unique strengths and weaknesses giving advantages in different applications. www.meowglobal.com |
What is Electronic Shutter?
Electronic Shutter, one of the major features of CCD camera, is not really a moving shutter, but a clever piece of signal processing. Under low light conditions, the CCD is allowed to gather signal at the electronic shutter speed of full 1/60th of a second. Under brighter lighting conditions, the video processing chip automatically responds by reading the CCD and then immediately "early purging" it, resulting in precise control over the video level. Even at a shutter speed of 1/100,000th of a second, the CCD camera is still delivering 60 images per second, but each image is gathered over a much shorter period of time. It doesn't end with the CCD...the image is constantly monitored and optimized by advanced on board signal processing circuitry. The end result is a fantastic picture, with no fiddling, no adjustments, and best of all, unbelievable reliability.
www.meowglobal.com
Advantages Of H.264 Over Other Formats
h.264
Better compression and lower file size than mpeg4, but the iPod's processor can only play videos encoded with h.264 up to 320x240 and 768kbps/sec (I've read that h264 is processing power hungry). And, I've read several threads that say h264 takes longer to encode. So I assume h.264 is good for videos that will only be played back on the iPod itself.
mpeg4
Worse compression and higher file size than h264 but the iPod can play mpeg4's that have been encoded with a larger resolution and higher bitrate...and again, am assuming this has something to do with mpeg4 requiring less processing power than h.264 hence the iPod being able to handle mpeg4's with higher resolution and bitrate than h264
www.meowglobal.com
Better compression and lower file size than mpeg4, but the iPod's processor can only play videos encoded with h.264 up to 320x240 and 768kbps/sec (I've read that h264 is processing power hungry). And, I've read several threads that say h264 takes longer to encode. So I assume h.264 is good for videos that will only be played back on the iPod itself.
mpeg4
Worse compression and higher file size than h264 but the iPod can play mpeg4's that have been encoded with a larger resolution and higher bitrate...and again, am assuming this has something to do with mpeg4 requiring less processing power than h.264 hence the iPod being able to handle mpeg4's with higher resolution and bitrate than h264
www.meowglobal.com
Video Compression and Transmission Terms
Term | Definition |
Bandwidth | Its popular meaning refers to the amount of data that can be transmitted per second over a wire or network. When it comes to video surveillance applications you need a high amount of bandwidth to transmit the large files. For remote viewing, 56K modems will not work well. DHL is OK, and cable modems or T1s (or better) are best. And you also want the best video compression you can afford to make the files as small as possible. |
CIF | Common Intermediate Format - a set of resolutionstandards used in video applications, defined as follows:
|
CODEC (aka "Code-Decode" or "Compression-Decompression") | A term referring to any technology used to compress and decompress large files such as audio and video files for efficient data transfer. |
Compression Standard (or compression algorithm) | A standard approach or 'formula' for compressing (and decompressing) data (in our case, video and audio data). There are many standard image or video compression algorithms available today (many are described below) and new ones come out each year. |
D1 | D1 is a video resolution standard. In NTSC it is 720 x 480 pixels. Its affect on video compression and transmission is due to the fact that the excellent resolution of a D1 image produces larger files to be compressed and transferred. |
The latest MPEG4 compression technology, released in 2003. H.264 provides excellent video compression. You get the same quality image as MPEG4 even at the higher resolutions like full screen D1. | |
ISO is an international organization founded in 1946 that organized and reviews standards worldwide. Their members such as ANSI (American National Standards Institute) and OSI (Open Systems Interconnection) create the standards and they review them for completeness and other criteria. ISO is not an acronym; the name derives from the greek word iso, which means equal. | |
Sometimes a compression algorithm will lose some detail of the original image in its compression of that image. An algorithm that loses some detail of the original image is called a 'lossy compression' algoritm. JPEG, for example, is considered to be a 'lossy' compression. | |
National Television Standards Committee - the analog video representation standard used in the US and South America. Compare to PAL | |
Phase Alternating Line - the analog video representation standard used in Australia, and most of Europe and Asia. Compare to NTSC. | |
A standard format for image compression (defined by the group who gave it its name) It was first introduced around 1986 and is a very common image format used on the web. JPEG is only used for photo (single frame) images (not video). JPEG is a 'lossy' image format - some of the detail of the image may be lost in its compression. | |
An update to the JPEG compression standard. Released in 2000, this standard offers both lossless and lossy compression and provides much better image quality at smaller filesizes than JPG does. File extension is ".jp2". | |
A standard format for video compression first introduced around 1988. MPEG achieves high compression rate by storing only the changes from one frame to another, instead of each entire frame. Although MPEG is lossy compression, the loss of image detail is generally imperceptible to the human eye except at the highest resolutions. MPEG has gone through several revisions as follows:
| |
MPEG4 was standardized in 1998 by the ISO and combines MPEG-2 and Apple's QuickTime technology. This resulted in a nice clear picture but also compressed much better than previous technologies. | |
MPEG4+ compression (aka H.264) | The latest MPEG4 video compression technology. See H.264compression for more information. |
proprietary compression algorithm | This refers to a compression algorithm that does not follow one of the compression standards such as MPEG4. Many times a proprietary algorithm will follow a standard mostlybut then tweak it in some specific way. The result may be a better (more efficient or better quality) compression but the downside is that since it uses a proprietary formula it may not be compatible with other products. Many DVRs and IP systems will use a proprietary algorithm within their product (for example to store the images to the hard drive) but provide interfaces in standard formats to communicate with other systems (for example when backing up a particular video event to a DVD). |
Resolution is a measurement of the quality or level of detail of an image. Usually expressed in terms of pixels, dots, or lines per inch.CIF and D1 are examples of some standard resolutions. The higher the resolution is, the greater the detail and number of pixels in the image will be, and also the larger the resulting video file will be. | |
Run Length Encoding (RLE) | This is a very simple form of data compression in which sequences of the same data value which occurs in many consecutive data elements are stored as a single data value and count, rather than as the original sequence. |
FPS
What is frames per second?
The frames per second (fps) relates to how many pictures the DVR will record in a second. Real time recording is about 30 fps on each camera. To calculate the fps per camera take the total fps in the system and divide it by the number of video inputs. For example, a 60 fps digital video recorder with 4 video inputs would result in about 15 fps per camera. The technology has finally gotten to the point now where real time recording is affordable. If you are recording cash registers or something similar then you should definitely invest in real time recording.
playing videos from dvr in a pc
I had this problem recently with a backup from a CCTV system. I backed up the file but could not play it on my Pc?
You have to convert the file into a format that can be played by our player or install the player coming with the dvr
You have to convert the file into a format that can be played by our player or install the player coming with the dvr
Wednesday, 13 April 2011
Security Camera Lens
Security Camera Lens
Which Security Camera Lens Should I Use?
How far you need to see will determine what security camera lens you should use to best fit your application. A 4mm lens will give about a 70 degree angle of view with 35 feet of facial detail. This works great for residential or small office security camera applications. If you need to see further you would go with a higher powered lens. Keep in mind that the further you want to see will narrow the field of view of your picture.
This tool will help you calculate the field of view you will get with a particular lens. Or you can calculate the required lens size needed to obtain a particular field of view.
A rule of thumb is that a 8mm lens is like a 4mm lens zoomed in 2 times. Similarily, a 16mm lens is like the 4mm lens zoomed in 4 times. For example, a 16mm lens would give you about a 15 degree angle of view focussed at 35 ft.
www.meowglobal.comWhat If I Do Not Know Exactly How Far I Need To See?
Instead of going with a fixed focus lens you can go with a varifocal lens. With a simple adjustment you can manually zoom in or zoom out and focus the camera to the exact distance needed to get a clear picture. Varifocal lenses come in all different sizes: (3.5-8mm; 9-22mm; and 5-50mm) just to name a few. This is the best option for large commercial applications because you can adjust the focal distance to what works just right.
www.meowglobal.com
What is a PTZ camera?
A Pan Tilt Zoom camera (PTZ) allows you to pan (back and forth), tilt (up and down), and zoom (focus in and out) your camera remotely. The PTZ is controlled using a remote PTZ controller or you can control it through most DVRs (look for PTZ support). The disadvantages of a PTZ camera is that they are very expensive . And all the moving parts make it susceptible to wear and breakdown. There are some new digital versions of PTZ cameras just coming on the market that have no mechanical parts. These PTZs are very promising but are still a little too expensive to be practical for most uses. PTZ cameras require a data cable to be run to the camera in addition to the video and power cables. Unless you have a person who is watching the scene and adjusting the field of view of the camera based on whats going on its not as useful. Most times you are better off buying more of the non-PTZ cameras to continuously cover the area rather than a PTZ.
www.meowglobal.com
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