how to calculate resolution with pixel count and aspect ratio

[TrainFan475]

I have an old camera with a crappy lcd screen. I want to know the resolution of the display, but the only information I could find on it was that it has 115,000 pixels. The aspect ratio appears to be 4:3, so can I somehow calculate the resolution with this knowledge?

[minibois]

The closest standard resolutions to that would be:

384×288

or

400×300

 

Which are 112.320 pixels and 120.000 pixels respectively.

https://en.wikipedia.org/wiki/List_of_common_resolutions

 

But keep in mind the 4:3 is not always super accurate and the manufacturer could have chosen a slightly different format

[TrainFan475]

I just found this too: https://www.pointsinfocus.com/tools/megapixels-to-image-resolution-calculator/

it came out to 392x294.

[Mira Yurizaki]

Start with the square root of the pixel count (~339 in this case), and play around with the numbers until you get something that's close enough to the pixel count and the aspect ratio. If we started with 340 wide, we get 255 tall which gives us 86,700... so obviously this isn't the resolution, but it's a good enough starting point.

[Glenwing]

2 hours ago, TrainFan2020 said:

I have an old camera with a crappy lcd screen. I want to know the resolution of the display, but the only information I could find on it was that it has 115,000 pixels. The aspect ratio appears to be 4:3, so can I somehow calculate the resolution with this knowledge?

For 4:3 aspect ratio,

H = 4/3 ∙ V

and,

H ∙ V = 115,000

= (4/3 ∙ V) ∙ V = 115,000

= (4/3 ∙ V²) = 115,000

 

(4/3) V² = 115,000

V² = 86,250

V ≈ 294

 

H = 4/3 ∙ V

= 4/3 ∙ 294

≈ 392

 

392 × 294 = 115,248

Closest integer solution.

[SolarNova]

3 hours ago, TrainFan2020 said:

I have an old camera with a crappy lcd screen. I want to know the resolution of the display, but the only information I could find on it was that it has 115,000 pixels. The aspect ratio appears to be 4:3, so can I somehow calculate the resolution with this knowledge?

Bit of mathmatics.

 

If u have the ratio (C:R) and the resolution and want to find the number of columns (C) and rows (R) it goes as follows.

 

Ratio = 4:3 (C:R)

Pixel count = 115,000

 

C² = √ 115,000x4/3

 

C = 391 (or 392)

 

R² = √ 115,000x3/4

 

R = 294

 

391 x 294 = 114,954 (or 115,248)