DigiOpG2
Digital Video Recorder
Page
29
3040-00052
6.1
System-General
Set general environment of the system.
6.1.1.
Image Size
Select the recording resolution. Resolution is the number of pixels for length and width, which are used to display one image.
Resolution displays the pixel number in (width)×(length), and the user can select one resolution among 352×240, 640×240,
and 720×480. Default is 640×240.
The bigger the resolution number, the better the quality that is displayed. Resolution of 352×240 is VHS quality, and 720×480
with a high-resolution camera is DVD quality. Selecting appropriate resolution is important since higher quality images require
more storage space, and shortens the recording period.
Note
Since the required storage space is proportional to the area of the image (width×length), 640×240 takes up
approximately 1.8 times bigger space than 352×240, and 2.5~3 times bigger for 720×480. Therefore, the recording
period decreases when selecting the high resolution.
Note
Even with the same resolution, total recording period can vary depending on characteristics such as recording
quality, motion detection threshold and average motion of objects in the image, complexity of image, and video
noise of the images. However, EDNS-3000 series controls the average size of images not to exceed the following
maximum limit for each resolution in every occasion.
352×240 : Normally 3~5KB, Max. Average 8KByte/image
640×240 : Normally 5~10KB, Max. Average 13KByte/image
720×480 : Normally 6~16KB, Max. Average 15KByte/image
If the average size exceeds the maximum, the system automatically reduces the recording quality to maintain below
maximum. The issue of reduced total recording time due to increased size caused by nighttime camera noise, is
therefore eliminated.
