IDIS
Glossary

Dictionary about IDIS products description.

home Support Glossary

Glossary

Use an index to find information quickly.

total 107 data ( 8/ 16 page )

  • 54
  • [R]Rolling shutter

    A rolling shutter is an electronic shutter used in electronic cameras. The image sensor reads and resets each pixel in a very fast speed in a serial manner. Thus one image is comprised of pixels sampled from ever so slightly different time. There are some artifacts for very fast moving objects.

  • 53
  • [P]Progressive scan

    When the analog cameras were first invented, we did not have enough technologies to handle bandwidth of D1@30ips full frame. So instead, the early engineers use a technique called interlaced video signal, used in NTSC/PAL, to use time and inter line multiplexing. So the story goes to complicate the old analog camera field image vs frame image, and even/odd fields, giving interlacing zig-zag artifacts of moving objects.

    Virtually all IP cameras including DirectIP cameras use progressive scan these days. All images are taken in a progressive way.

    However, in most cases, the image sensors use rolling electronic shutter, not a global electronic shutter. It's not perfect, but it is so much better than the interlaced scanned video.

  • 52
  • [T]Time sync

    There is only one time, which is UTC 0 time at GMT. all the other times are translated time according to their time zones.  

     

    [NVR]
    So when an event or an incident is recorded in NVR, it is very important to make sure that the recorded images are synchronized to the correct time.
    DirectIP NVRs use SNTP(Simple Network Timesync Protocol) to synchronize its time to a master time server or can run as a SNTP server to which the time of other NVRs can be synchronized.

     

    [Camera]

    When the analog cameras were first invented, we did not have enough technologies to handle bandwidth of D1@30ips full frame. So instead, the early engineers use a technique called interlaced video signal, used in NTSC/PAL, to use time and inter line multiplexing. So the story goes to complicate the old analog camera field image vs frame image, and even/odd fields, giving interlacing zig-zag artifacts of moving objects.
    Virtually all IP cameras including DIP cameras use progressive scan these days. all images are taken in a progressive way.
    However, in most cases, the image sensors use rolling electronic shutter, not a global electronic shutter. It's not perfect, but it is so much better than the interlaced scanned video.