Join Todd Kopriva for an in-depth discussion in this video The Rolling Shutter Repair effect, part of Premiere Pro CS6 New Features Overview.
Premiere Pro CS6 includes a new effect called the Rolling Shutter Repair effect. As the name indicates, this effect repairs rolling shutter artifacts. The term Rolling Shutter refers to the fact that many cameras, such as DSLRs and many mobile phone cameras, don't record an entire frame all at once, when they record a movie. Rather they have a rolling shutter. They record the top of the frame and then they move down a scan line at a time until they get to the bottom of the frame.
This means that the top of the frame is recorded at an earlier time than the bottom of the frame. If there's any motion in the shot, or if the camera itself is moving, then there's going to be some distortion, as you can see in this image here. This line should be vertical, it's the edge of a window. And these lines on the edge of the white board should be vertical. But because of the rolling shutter artifact, they're skewed. These artifacts are even more noticeable in motion. I'll click Play so that we can see.
Notice there's a wobbling that some people refer to as jello cam in this shot. We'll apply the rolling shutter repair effect and fix this. In the Effects panel I'll type rolling and drag the rolling shutter repair effect onto the clip, and immediately just with the default settings things look better. This edge is pretty close to vertical, as is this one. I'll turn the effect on and off and the difference is pretty noticable. Let's look at some other frames.
I'll drag the current time indicator as scrub through and it looks better throughout. I'll go ahead and hit play. Seeing it in motion. It does look quite a bit better and those are just at the default settings. Let's see if we can improve it even more. I'll line the whiteboard up with the edge of the frame here so that we can see what should be a straight line. And I'm going to drag the rolling shutter rate property.
This property is a fraction. It refers to the time it takes for the camera to capture a frame divided by the time between frames. You don't really need to understand that. All that you do need to understand is that if you drag this property left and right while watching in the frame, you should be able to see that the image skews one way or the other. And what you want to do is to make the edge as close to vertical as possible. This number should probably be between about 50 and 70% for many DSLR cameras.
And closer to 100% for mobile phones. This was shot on a mobile phone, so I expect the number I need to be quite high. Putting it at 100%, this line looks pretty close to vertical, as does this one, but we still have a little bit of skew here. So I'll drag it back a little bit. That seems like about as good as we're going to be able to get this. I'll hit Play again. And it takes a little bit of time to process before it plays back in real time.
This is a very processor intensive effect. But that looks pretty good, definitely a lot better than we started. The next property down, Scan Direction, refers to the order in which the lines are scanned in the image. As I mentioned, usually the top line is scanned first followed by the next lines going down until the bottom of the frame is reached. But if for example you rotated your phone or your camera and took the picture then it would be.
Left to right, or right to left. Or if you flip the camera upside down, bottom to top. In the Advanced area, we see that we can choose between the Warp method and the Pixel Motion method. The way that the Rolling Shuttle Repair effect works is that several points are tracked on the screen. And then the effect does a warp to distort the image. To line things back up, so that the vertical lines are vertical. With the warp setting, only a sparse number of points are used. Whereas, with the Pixel Motion setting, every pixel in the image is tracked. As you can imagine, the Pixel Motion setting is much more computationally intensive but, it can also give better results.
I won't demonstrate that right now because it does take quite a while to process. If you choose Detailed analysis, then the more computationally intensive version of the Warp method is used. If I choose Pixel Motion, then Pixel Motion detail is exposed and we can increase this to do an even more computationally intensive version of Pixel Motion. I'll go back to Warp. So, that's the new Rolling Shutter repair effect. As you see, even at the default settings, it does a pretty good job of getting rid of the artifacts in footage shot with a DSLR or mobile phone camera when there is a lot of motion in the shot or when the camera is moving a lot.
- User interface improvements
- Importing and sequence setup improvements
- Editing improvements
- Effect improvements
- Performance improvements
- Audio improvements
- Exporting improvements
- Miscellaneous new and removed features