Use the Rolling Shutter Repair effect to remove distortion caused by an unstable camera and moving subject.
A common problem for DSLR and other CMOS sensor-based cameras is that they typically have a lag time between scanning lines of video. Since not all parts of the video are recorded at the same time, this can cause Digital cameras with CMOS sensors often have a rolling shutter, which captures a frame of video one scan line at a time. Due to the time lag between scan lines, not all parts of the image are recorded at exactly the same time. If the camera is moving or the subject is moving, the rolling shutter can cause distortions.
The Rolling Shutter Repair effect (available in the Distort effect category) can be used to remove these distortion artifacts.
Properties under the Rolling Shutter Repair effect
Rolling Shutter Rate
Specifies the percentage of the frame rate, which is the scan time. DSLRs seem to be in the 50-70% range, and iPhone is close to 100%. Adjust this value until distorted lines become vertical.
Scan Direction
Specifies the direction that the rolling shutter scan takes place. Most cameras scan top-to-bottom of the sensor, but of course, you can mount a camera upside down or rotate a camera completely in the case of a smartphone.
Advanced section
- Method: Indicates if optical-flow analysis and pixel-motion retiming will be used to generate the unwarped frames (Pixel Motion) or if a sparse point-tracking and warping method should be used (Warp).
- Detailed Analysis: Performs a more detailed point analysis in the warp. Available when using the Warp method.
- Pixel Motion Detail: Specifies how detailed the optical-flow vector field computation should be. Available when using the Pixel Motion method.
Although the Warp Stabilizer effect has a rolling shutter repair effect within it, the standalone version has more controls. There are also times when you want to repair a rolling shutter problem, but you don't need to stabilize the shot.
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