avinash.trivedi

Hi, Thanks for your reply. I am from Delhi NCR. Regards

Hi Kalpesh, Thanks for your prompt reply. The application is highly demanding of higher frame rate/resolution since it involves surveillance of tunnels/tracks in tough weather conditions. However even if it is software based or digital, the camera is still analog in nature when it captures the frame (through CCD or CMOS whichever is the case) so it has to be governed by effective pixels, scanning system and TVL. The actual captured frame quality cannot be enhanced dramatically higher just by use of high quality encoder of NVMS etc. For example if an analog camera of 480TVL is connected to an encoder which is capable of producing 25fps, 4CIF at MPEG4, still will not be able to optimally achieve 4CIF in real time because of poor TVL capabilities of the camera! It requires minimum 530TVL camera to achieve 4CIF resolution. I have gone throuh the axis website and could not find any whitepaper in this regard. I believe this may be some marketing gimmick based on some mathematical calculations which they have used to promote the product. You may like to advise me further on this issue. regards Avinash

Hi, Thanks for enhancing our knowledge base by providing such a meaningful comparison. I would like you to throw some light on a feature of Axis 221 D/N Network camera which claims to have resolution of 45fps at VGA and 60fps at half VGA for MJPEG and 30fps at VGA and 60fps at half VGA for MPEG4. I am not sure whether this is technically possible to achieve such a resolution (in PAL) ! I have heard of best resolutions of 25fps at 4CIF for MPEG4 etc and any thing beyond that or higher fps at lower resolution is beyond my current knowledge. I hope you will be able to enlighten me on this issue. Regards