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Results tagged with pixels
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user 75947
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Resolution on smaller vs larger sensors
Conveniently, for the same pixels count and aspect ratio, when you decrease the sensor size, you mathematically increase the pixel density, so as long as you don't worry about signal/noise ratio, you are … For instance, assuming a full-frame (FF) and micro-four-thirds (MFT) sensors with 7200 pixels on the long dimension, they can theoretically see 3600 lines pairs (a black and a white line in a regularly …
- 22k
1
vote
Calculating the size of an object from a single image, given the distance from the camera
The projected size s on your sensor behind a lens of focal length f of an objects of size S at distance D is:
s = (f × S) ÷ D
If your measure is in pixels then your size in pixels p is in a linear relation … :
K = (D × p) ÷ S
Once you have it, you can reuse it in formula #1 where you don't know the actual size but know the distance and the size in pixels. …
- 22k
5
votes
Accepted
Image File Size Question
PNG and GIF do something close to "run-length-encoding" (RLE): when several contiguous pixels have the same value they are replaced by a single value and a count. …
- 22k
3
votes
How can I measure a height in an image using a person's height as reference?
With Gimp you can define the image definition to about any arbitrary value, and the measure tool can display measure in the corresponding physical units. For instance in this picture the woman is abou …
- 22k
0
votes
Does higher resolution in an image imply more bits per pixel?
The resolution is a measure of the pixels per unit of physical length. So to increase the resolution of the image you mostly have to increase the pixel count. … The number of bits per pixels (a.k.a pixel depth) doesn't change the resolution. …
- 22k