M50 ceiling mount

Ten reasons to switch to IP-based video

Crystal-clear motion

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

All cameras capture an image one line at a time. IP cameras use progressive scan in which the entire image is scanned on every pass.

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 blurred in the final image.

Figure 9: For interlaced scanning (left) the result can be blurred, whereas for progressive scan (right) the image is clear, as the entire image is scanned on every pass.

Interlaced and progressive scanning

Figure 10: To the left, an image from an analog camera using interlaced scan. To the right, an image from an Axis network camera using progressive scan. Both cameras used the same type of lens and the speed of the car was the same at 20 km/h (15 mph). The driver is clearly visible only in the progressive scan image.

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