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7

Crystal-clear motion

With an IP camera there are no interlacing problems. Using progressive scan, the entire image is captured each time, with superior image quality as a result.

All cameras capture an image one line at a time. Most analog cameras use interlaced scanning. This means that only lines with odd numbers are scanned on the first pass, and the even-numbered lines are scanned on the next. The two subsets are then combined into one image. The problem with this is that any motion happening in between the passes will be blurry in the final image.

1st field:
Odd lines

2nd field: Even lines [17/20 ms (NTSC/PAL) later]

Freeze frame on moving dot using interlaced scan

Freeze frame on moving dot using progressive scan



IP cameras use progressive scan in which the entire image is scanned on every pass.

At left, an image from an analog camera using interlaced scanning. At right, an image from an Axis network camera using progressive scan technology. Both cameras used the same type of lens and the speed of the car was the same at 20 km/h (15 mph). The background is clear in both images. However, the driver is clearly visible only in the image using progressive scan technology.


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