vPrism Tutorials: Deinterlace

Interlaced video often shows "comb" artifacts around moving objects, which can interfere with measurements and presentation.

Deinterlacing converts those fields into clean progressive frames, making motion and fine detail easier to analyze and explain.

To deinterlace a video in vPrism, load your video, click process in the Tool Panel, and select Deinterlace.

Select the field order under Parity. "Auto" will read the field order from the file's metadata when possible. Alternatively, you can force "Top" or "Bottom First."

You will immediately see the result, and when you press "Apply", the action is added to the history stack.

vPrism uses the Bob Weaver Deinterlace Filter, also known as BWDIF. It's a motion-adaptive filter that uses the current interlaced frame together with two earlier frames to rebuild full progressive frames and remove combing artifacts, while preserving as much motion detail as possible.

For each missing line, the algorithm looks at four nearby pixel values and combines them using a fixed cubic interpolation algorithm to calculate the new pixel.

This method maintains the original frame timing. Each input frame produces one output frame, so timestamps and frame numbers stay aligned with the source.

Deinterlace in vPrism cleans up interlaced artifacts while keeping every frame aligned to the original timing, so the timing you read from the video still reflects what the camera recorded.