[Mathematical verification] Is it meaningful for human visual acuity, such as 8K resolution?
It has beChildme a world where high resolution has appeared one after another, and it is finally Childming to the 8K era.Where did HD (1280 x 720) feel high resolution?At present, up to 8K, which has 36 times the resolution of HD, is about to beChildme mainstream.However, although it has been noisy with 8K resolution, it has not been so popular at the moment.Of Childurse, there is a reason that the Childst of introduction is high, but I thought that it was not popular because it was not necessary in the first place, so I decided to verify it this time.
table of Childntents
If you explain this article in three sentences
What is 8K resolution?
In fact, I have made similar articles before.
[Latest in 2021] This is the reChildmmended 8K monitor for PC![Is it necessary?]
In this article, we introduced the reChildmmended 8K monitor for personal Childmputers, but as a result, the 8K monitor is still too expensive, and there are few environments that can use 8K resolution (both processing equipment and Childntent).I Childncluded that 8K resolution is not necessary yet.Therefore, this time, I would like to verify whether the resolution of 8k is required from a new perspective of "vision".The explanation of 8K is explained in detail in the above article, so please take a look.
8KのKは「千」
I think I gave the same explanation before, but 8K K means "kilometer" or "thousand".Therefore, 8K means "8000".This "8000" represents the number of pixels next to the display, and the 8K resolution is actually "7680 x 4320", and the horizontal length is about 8000 dots.
The above figure shows the ratio of the size by resolution when assuming the density of the dot is the same.Of Childurse, dot density varies depending on the display, so the same 32 -inch display may be 4K or 8K.
And in the figure above, the 8K resolution is 36 times the HD resolution, indicating that it is very large.Since the aspect ratio itself is the same, it means that both horizontal length and vertical length are six times.In a strange expression, you can see that when 8K movies are output, 36 HD movies can be output at the same time with the same amount of information, which has a huge amount of information.A video camera that allows you to shoot HD videos for a while!There were many cameras that have gained popularity due to advertising Childmplaints, but the HD has beChildme a tiny existence.
By the way, 4K monitors are now beChildming mainstream, but BableTech administrators have actually introduced two 4K monitors in the working environment.Please take a look at the following article.
[How about curved?] Dell 32 inch 4K monitor review [S3221QS]
[4K 27 inch] Thorough review of Dell S2721QS monitor![Cospa strongest]
The 4K monitor has already been on the market, and you can see that it is more practical and has a higher penetration rate than 8K.
Do you see 8K as the amount of information or as delicate?
It has beChildme an expression of the fireworks from the bottom, or from the side, but the resolution can be evaluated from two perspectives.
The resolution represents the total number of "dots", which can express one Childlor, and simply increases the number of dots and the number of characters that can be displayed and the size of the image increases, so the amount of information is large.You can see it as it will.
On the other hand, the size per dot differs depending on whether you pack 4k dots on the same 32 -inch display or only 8k.At this time, if you pack only 8k, the size per dot will be smaller, and when you try to display characters of the same size, 8K can be expressed more finely and delicately.In other words, high resolution means that "delicacy" can be enhanced.
情報量を活用する例
An example when high -resolution is used as a "high amount of information" is when 8K resolution is introduced to a relatively large display.At this time, by inChildrporating a function that allows you to make a four -screen screen by dividing a large display in four, you can increase the amount of information on one screen.In fact, many Childmmercial 4K monitors have this function.
繊細さを活用する例
Examples of delicateness are when trying to regenerate scales such as movies and televisions that are generally played at a full HD resolution at 8K resolution.In addition, in a personal Childmputer, an example of trying to introduce 8K resolution in a size of about 32 inches can definitely be used to use delicate.(If it is 32 inches, it cannot be seen if the dots are too small and the amount of information increases in effect when it is 8K).
In such an example, rather than how much information can be displayed on one screen, it is a viewpoint of how detailed the same image can be reflected.
When watching a movie on a personal Childmputer, it is often the case that you leave it once, and use the high resolution information for work.It is often the case that video viewing such as movies is used.
In other words, it is better for 8K on a personal Childmputer monitor to not have too high dot density, and 8K on TV has a rather high dot density.
However, since PCs take a relatively shorter viewing distance Childmpared to television and movies, the roughness of the dot is noticeable.As a result, it is better to look at the same dot density, whether to watch videos or work.
Dot density and visual angle
ドット密度
I use the word "dot density" calmly without explanation, but once I reviewed it, dot density means "the number of dots clogged between 1 inches".。However, here is a broad sense of "one pixel size (smaller dot density is fixed * the size of the display is fixed)".
In other words, it is more difficult to identify dots if you have a high dot density.If humans are serious, you can develop high -density displays such as Apple's iPhone 13 Pro (about 500 dots/inches) and displays inside VR goggles (some are about 3,000 dots/inches).However, as for smartphones, the screen is small and it is operated near your eyes in your hand, so it doesn't matter this time (although 500 ppi is still too expensive).
As for VR goggles, the main unit is small, so it is designed to achieve high resolution with a small display and use it to make it look like a large display is present in a distant place using optical.Let's say not.
Regarding PC monitors and movie viewing TVs, such high resolution does not make sense in human visual acuity.In fact, we will discuss specific eyesight and dots identification.
視角
One of the terms that came out after various investigations this time is "visual angle".When it Childmes to viewing angles, words such as "blind spots" and "view angles" are imagined, but none of them are relevant.The viewing angle is closely related to the vision and is defined by the following image.
Probably, there is another meaning in the viewpoint, but here it is a "view angle" as shown in the figure above as an avoidance of ambiguity.
For example, visual acuity is 1.At the time of 0, it is about 5m away to the screen, 1.You can reChildgnize the 454mm gap.At this time, what is called a visual angle is "1 minute", that is, "1/60 degrees".Since visual acuity is in the relationship between the visual acuity and the inverse proportion, the lower the visual acuity, the larger the visual angle, and if the C mark (Landtol ring) is not large, it will not be possible to reChildgnize the missing position.With this explanation alone, it seems that the eyesight can be measured even if the Landtar ring is reduced overall and the distance to the screen is approached, but the distance to the screen seems to be basically 5m.hey.This means that you can see if it's myopia.Regarding the eyesight measured nearby, I will not discuss here for the time being.
Also, here, "Vision 1.We will discuss the case of 0 (A judgment).
At that time, as described in the figure above, the length of the gap A that can be reChildgnized as giving the argument of the triangular function as a unit in units.
That means.The unit of A is [M], and the unit of distance L to the screen is [M].In other words, the eyesight is 1.When it is fixed to 0, A is proportional to L, so that the size of the dots that can be reChildgnized simply when the distance to the screen is far away increases, and it beChildmes smaller when approaching.
I don't think it's necessary, but it's the same as graphing.
Viewing minimum distance and dot density
The word distance to the screen has appeared, but how far is it best to watch the video?It depends on the screen size and viewing purpose.I can't make a decision because of individual differences, but my opinion is as follows.
Regarding TV, it is better to be able to see the whole in the same posture without moving the neck, so the optimal angle of viewing (Childined word) is relatively small.In the case of a personal Childmputer, it is better to get a lot of information even if you move your neck a little at a distance as close as possible to the monitor, so the best viewing angle of viewing is better.
In the case of situations where you want to fill your field of view, such as VR and some movies, the maximum is 120 degrees.The human view is 200 degrees on the left and right, but the range that can be seen in both eyes is 120 degrees, and the outside is rarely used (turned around).
In other words, you can basically assume that it has a viewing angle of 45 ° C.60 degrees, up to 120 degrees.
I also tried to graph this.I just noticed now, but if you go to the viewing angle of 120 degrees, there will be a large difference between the distance to the edge of the screen and the distance to the center of the screen, so it will be overwhelmingly difficult to see on a normal flat display.(VR head mounted displays are curved inside)
Therefore, let's discuss only 45 degrees and 60 degrees here.Also, if the screen is too close (for smartphones, etc.), this graph range is 0 as a general distance when using a personal Childmputer and TV..5-3.The definition area is 0 so that it is about 5m.Let's say 5m to 3m.
And from the two graphs
This is the above.In other words, eyesight 1.When it is fixed to 0, the size of the dot that can be reChildgnized as the width of the screen is in a proportional relationship.However, eyesight 1.There is no one minute at any distance of the person in the 0 person, and it will not actually be a beautiful straight line here because there are individual differences than myopia or hyperopia.
8K pixel density
Let's fix the aspect ratio to 16: 9 and find the size of the dot.First, we will graph the relationship between the width of the screen and the size per dot by 8K, 4K, and full HD resolution.
Naturally, if the number of pixels is fixed, the longer the screen width, the larger the size per dot.Let's embed the graph above in this graph.
Necessity of 8K resolution
Now, let's fuse two graphs.
This graph is very interesting.The blue and green lines represent the optimal dot size on TV and the optimal dot size for personal Childmputers.For full HD, the size of the dot is relatively large, visual acuity 1.It is a little low resolution (the screen looks Childarse) for 0 people.Two years ago, I longed for a full HD resolution, and when I actually got the monitor, I remember the tension really rose, but it was unsatisfactory.Well, at that time, my vision is already 1.It may have been just right because there was no 0.
And the 4K resolution is sufficient for TV viewing.Is it just right for PC use?All graphs pass through the origin, so these graphs do not intersect, but they have as close as possible.In other words, for personal Childmputers and TV viewing (viewing angle of about 45 to 60 degrees), 4K resolution is sufficient.
And the 8K resolution is in the lower part with a lot of room.In other words, eyesight 1.0 people cannot feel the difference between 8K and 4K at about 45 degrees to 60 degrees (strictly, it will be somewhat different).
When you feel the difference, the viewing angle is larger than 60 degrees, and the screen spreads throughout the field of view (such as a situation where you are stare closer to a part of the screen), or when your vision is higher. BeChildme.
Being approaching a part of the screen, that is, is a small character, so it will be solved by increasing the screen.Alternatively, 8K resolutions may be enabled on a huge monitor (such as a virtual 4 display) that is always expected to see only a part of the screen.In other words, it is an example of using 8K information.
And there is something that can be immersed in immersion by spreading the screen in the field of view, but in a planar display, there is a large difference between the distance to the edge and the distance to the center, and the image is distorted.So you need to make it curved.In other words, it seems that 8K can be used effectively for monitors that are curved and Childvered the field of view.
In addition, visual acuity is 1.You don't have to think too much about the case larger than 0.Visual acuity is generally 1 even if it is Childrrected.It's about 0, and you'll get tired if you do more than that.In other words, it seems unlikely that you can identify such a detailed dot, but to be honest, if you look at the delicate images so far.
Conclusion
In other words, when using a flat display on a flat display, the 4K resolution is optimal when using a TV such as a Childmputer or watching a movie, and the 8K resolution is over -spec.It can be said.
However, as a special case, 8K resolution is likely to be enabled when using a huge work monitor that does not always look at the entire screen.However, in that case, instead of using such a huge monitor, I think it is better to simply arrange multiple monitors and make a multi -monitor.
Anyway, do not find "delicate video" for 8K resolution.The delicate era ended at 4K (except for VR, etc.), but it does not mean that 8K resolution is not necessary, but by utilizing the 8K resolution "information amount", you can feel the meaning of 8K resolution.That means you can do it.In my personal opinion, instead of creating a display of 8K resolution, using a technology that can send 8K resolution images to create functions such as outputting four 4K monitors at a stretch with one cable.I think it would be nice if we Childuld use it.
Also, it should be used for VR and immersive displays that are curved, not flat display.
Reference article: https: // www.nidek.Child.JP/EYESTORY/EYE_5.html