Hi, I’m Cedric from Rtings.com. This is the first video in a series about
motion. Motion is a complex subject and there is a lot of misconceptions about it. Hopefully
the next few videos are going to help clear it up. Today’s subject is how can we actually
capture motion blur on in a photo. It might seem easy at first, but matching what you
see with your own eyes when following a moving object is not that straightforward.
Motion all depends on your reference point and whether your eyes are moving at the same
speed as the moving object. A good test to illustrate this is from testufo.com. First,
fix with your eyes the top UFO, without moving them. You’re going to see white vertical lines.
Then follow the second UFO with your eyes. You’re going to see a white background with
moving black squares. So what is happening here? In real life, when
your eyes are following a moving object, that object will always appear centered in your
field of view. On a screen though, the moving object is limited by the frame rate. It jumps
from one point to another. At the beginning of the frame, the object appears centered
in your field of view, but when your eyes continue to move, the object will shift slightly
to the left in your field of view. That back and forth won’t actually be perceived by the
eye assuming the frame rate is high enough, instead the eyes are going to perceive a blur
starting from the binning to the end position. We’ve now moved to our test room to actually
show you what it looks like on a real TV. If you were to take a normal picture, it wouldn’t
really represent what we see with our own eyes. Which is why the camera needs to move
at the same speed as the moving object. We are using a camera slider to do so. If we
take a normal picture. It looks like this. Which is far from what we see with our own
eyes. But if we take a picture while the camera is moving. It’s going to look like this. Which is a lot closer to what we see in real life. The difficulty in doing so is the camera needs
to move at exactly the same speed as the moving object. Mark Rejhon from blurbusters.com invented
a temporal pattern to help for this. The pattern is composed of four vertical lines of vertical
lines, each displayed for one frame. The camera shutter speed is set to four frames.
If we go too slow. You can see that lines are tilted to the left. If we go too fast. The lines are tilted to the right. It’s only if you got the exact same speed as the object that the lines are going to be aligned. So that is how we take the motion blur pictures
for our reviews. The next few videos are going to go into more details on how to interpret
these pictures and what varies between TVs. If you want to know more about motion, click
the link in the description below. And if you liked this video, subscribe to our channel,
and see you next time!