You may not know, the resolution of the human eye is 576 megapixels and it has a very good optical stabilization system.
I have a simple yet fun experiment for you: Grab a pen, place it at arm’s length in front of your eyes, and start shaking. Do you see it blurred out? If you can’t find a pen, you can try it with your own hand, spread your fingers, and start shaking.
Remember to keep your pen or hand, as we will do one more experiment with it later in this article.
What about now, the pen will smudge if you shake it, of course, the hand too. This proves that our eyes cannot process fast moving images. FPS (frames per second) in reality that we perceive is limited.
The delay of the human brain when processing images
To explain this, we have to understand the visual processing mechanism of the brain. Let’s recall 8th grade biology for a moment. In your eye there are cones and rods like the sensor dots of a camera.
They are located behind your eyes, which receive light emitted or reflected from all objects outside the world we live in. These cells then convert the wave and light frequency signals into electrical signals. Each photoreceptor cell is connected to a nerve ending that sends signals to the visual cortex for analysis and processing.
The brain then combines these signals and reconstructs the outer world into your inner world. And that regeneration is both objective and personal.
For example, you and another friend sitting next to you both see a car parked in front of you, both know it’s a car but you say it’s beautiful and your friend doesn’t. .
But the important thing here is, if the car is stationary, you will see it clearly, but if it is moving, it is not. That’s because the brain processes the visual signals it receives from the eye with a certain delay.
In 2014, a team of scientists at the Massachusetts Institute of Technology (MIT), USA did an experiment to measure exactly how much this delay is?
They asked volunteers to sit in front of a screen and gave them a sequence of 6-12 images that appeared and disappeared at different speeds. The results showed that volunteers were able to recognize images in a period of 13 milliseconds, or 0.013 seconds. Working out, it equates to 1/0.013 = 75 frames per second.
The brain’s latency in processing images limits the reality we’re perceiving at FPS = 75. This is higher than most small animals from goldfish to dogs or cats. However, it is significantly lower than birds of prey such as eagles, which can see up to 140 frames per second.
Eye-catching optical anti-shake system
Now, let’s go back to the original experiment of the article. Do you still have your pen or hand? Then, hold them up in front of you, lock focus on them, and start shaking your head, up and down and left to right. Do you see the smudged pen or hand?
There is a little, but not much! You can still clearly see the objects you want to lock in focus. That’s because the inside of your head has a superb anti-vibration system called the vestibulo-ocular reflex (VOR) or vestibular-ocular reflex.
The effect of VOR is to stabilize the image present on your retina, which is similar to a camera’s optical image stabilization system.
We all know that inside everyone’s cochlea there is a system called the vestibule. It is only 3x5mm small but plays a very important role for humans.
The vestibule is the place to sense every movement that is happening to your body, helping you to balance when walking, bending or turning. People with vestibular disorders are therefore often dizzy, unsteady on their feet, and easily fall.
This system has a bundle of nerves that connect to the eye, which helps you lock objects in your field of vision. Once you shake your head to the left, the vestibule senses this head movement and sends a signal to the eyes to produce the VOR reflex. The eye will then move in the opposite direction, to the right to stabilize the image on the retina, allowing you to still see the object clearly.
The vestibular-ocular reflex plays an extremely important role. If it is disturbed, you will not be able to walk down the stairs, because every step you take shakes the visual image. You also can’t see the signs clearly while driving, because we all know motorbikes and cars have vibrations while moving.
Resolution of the human eye
In 2005, Dr. Roger Clark, a scientist and photographer, calculated the resolution of the human eye to be about 576 megapixels. You can read his calculations in detail here. But keep in mind that this is only the resolution at your central point of view, in a region called the fovea.
Out of focus of the image, your eyes will blur the field of view to reduce energy consumption and keep the brain from overloading. Out-of-focus images you perceive are only 5-15 megapixels in resolution.
These are all interesting coincidences between your eyes and cameras and electronic screens. Remember to take good care of them. And don’t forget, in contrast to the camera, your eyes need to be kept moist. Blink your eyes at least 15-20 times per minute every time you look at your computer or phone screen.
Synthetic
Source link: What is the FPS of the reality we live in?
– Emergenceingames.com