13
votes
Accepted
focal length and sensor width of a phone
The Redmi 6A uses the Sony Exmor IMX486 sensor, which is a 1/2.9" format sensor. Note that "1/2.9 inch" is merely a name, not its diagonal dimension (see: Why is a 1" sensor ...
- 32.3k
12
votes
Accepted
Is it possible to determine from only a photo of a cityscape whether it was taken close with wide angle or from a distance with zoom?
You can often use techniques from piloting. You can find alignments in the picture, for instance the corner of a building that masks off the 2nd vertical line of windows of the building in the back. ...
- 20.6k
8
votes
Is it possible to determine from only a photo of a cityscape whether it was taken close with wide angle or from a distance with zoom?
I am not knowledgeable on the math and programming needed for this, but I can provide you with some insights into information needed for something such.
What you want to look into, is perspective ...
- 2,702
5
votes
What should I consider when buying a camera and lens to take photos of surfaces for 3D textures?
Any interchangeable lens camera will do.
Invest in:
Lighting (for things that are physically textured, side vs head-on lighting makes a world of difference). You want to be as flexible as possible ...
- 7,182
5
votes
Accepted
What is the difference between a 3D camera and a stereo camera?
are 3d cameras same as stereo camera's?
Stereo cameras are a type of 3D camera.
There are other types of 3D cameras.
my understanding of stereo camera is that, there will be two lenses, where one ...
- 8,504
5
votes
Accepted
Convert regular panoramic photo into google cardboard file
OK, after a LOT of googling I finally have an answer:
First of all, I downloaded the facebook template for 360 degree photos, and added the (equirectangular!) spherical photo onto it, and 'saved as' ...
- 221
5
votes
Accepted
I'm a sculptor & need a 3d photosphere of a human head for reference, is that possible?
I believe that what you want is to create a 3D model from a series of photographs of your subjects head. The process of doing this is technically a form of photogrammetry
This can be done reasonably ...
- 1,821
4
votes
How do I take a stereoscopic photo to view with Google Cardboard without buying two DSLRs?
how would you represent an image with a 60° span without just leaving
most of it black?
You can't do it without leaving most of it black. With a 60ºx60º image, you've only covered 1/18th of the ...
- 51.4k
4
votes
Accepted
Is it possible to calculate the distance to an object using two pictures taken a few cm apart?
Is it possible to calculate the distance of an object to the camera with two pictures which are taken a few cm apart?
It depends. You'd need to know something more than just having the two photos. ...
- 31.7k
4
votes
Is it possible to determine from only a photo of a cityscape whether it was taken close with wide angle or from a distance with zoom?
The short answer is yes. It's done everyday.
The subject of Photogrammetry involves answers to your question.
Photogrammetry is measurement from images. Photogrammetry is useful for topographic ...
- 5,511
4
votes
Eerie 3D-effect in century-old portrait
It’s magical when a two-dimensional flat photograph exhibits the illusion of depth. This is especially true when its deliberate based on repeatable skills. Many of the old master portrait ...
- 38.7k
3
votes
What's the name of this style of looping photos?
With just two images (stereoscopy), it's called Wiggle Stereoscopy (stereo meaning two). For the general case (two or more), the general term is just Wiggle 3-D
From that wiki page:
Wiggle ...
- 897
3
votes
Accepted
What's the name of this style of looping photos?
According to Know Your Meme:
Wigglegrams (also known as stereographs) are animated images that simulate 3D effect by looping two or three frames of an object shot from the vantage points of the ...
- 26.9k
3
votes
What should I consider when buying a camera and lens to take photos of surfaces for 3D textures?
One of the main purposes of lightboxes is to minimize texture by placing dispersed light from almost every angle on the subject.
If you want to show textures, you need to use more directional ...
- 175k
3
votes
Old 3d Portrait (circa 1945)
Stereo still photography was popular near the turn of the last century. Two images were taken; one mimics a right eye view and the other a left eye view. The difference in these two views is call “...
- 38.7k
3
votes
How is this weird background / foreground angle shift achieved?
The effect is called wiggle stereoscopy or wiggle 3D. The image produced is wiggle stereogram.
It is produced by taking the two images of the same subject/scene, from a slightly different viewpoint (...
- 32.3k
3
votes
Accepted
Tools to take 3D pictures for a virtual show
If it doesn't have to be a smooth continuous transition from one view to the next, and if you can write HTML and JS, you can do all the work in the web page.
Calibrate the turntable with degree ...
- 385
3
votes
I'm a sculptor & need a 3d photosphere of a human head for reference, is that possible?
I think you're looking for a "bullet time camera array" also called a "timeslice camera array".
It allows you to take a picture of a person or object from many angles at the same ...
- 8,608
2
votes
What is exactly the '3D pop' in photography?
As Matt's answer says, this is something typically associated with Zeiss lenses that gets argued about on fredmiranda's alt-gear forum a lot. The theory goes that lenses that exhibit a high degree of "...
- 51.4k
2
votes
Is it possible to use a single image sensor to capture a stereoscopic image?
There are numerous products available which do this exact thing. They are adapters which often fit over an existing lens to produce 2 images on the sensor.
A quick search on ...
- 9,539
2
votes
How do I take a stereoscopic photo to view with Google Cardboard without buying two DSLRs?
There are a few companies that sell stereographic lenses for SLRs. Limited set of focal lenths but it should do what you want.
One example is the Loreo 3D
- 677
2
votes
When do straight lines become curved when talking about projection?
When do straight lines become curved when talking about projection?
When you decide what type of projection you wish to use.
A rectilinear projection will preserve straight lines (but not correct ...
- 175k
2
votes
Is it possible to determine from only a photo of a cityscape whether it was taken close with wide angle or from a distance with zoom?
If you have the lat/lon/alt locations of features that can be associated with x/y pixel locations on the image, it can be done. I did it myself.
For a hypothetical camera position/orientation/focal ...
- 1,229
2
votes
Is it possible to determine from only a photo of a cityscape whether it was taken close with wide angle or from a distance with zoom?
If the picture has very little perspective, resembling an isometric drawing, it was taken from extremely far away with a telescopic lens. EG: You see two 3-storey buildings, one in front of the other. ...
- 129
2
votes
Accepted
File formats for stereoscopic 3D images
There are multiple ways stereoscopic image data can be stored. The easiest to create are side-by-side JPGs.
Side-by-side JPGs (JPS). According to sView: Stereoscopic Formats, the images are in cross-...
- 26.9k
2
votes
How to make a 360' panorama taking screenshots of a 3D enviroment
To create a panoramic image, all the parts must be shot from the same place, so they can be stitched together. Your snapshots are from different places, and because of that they can't be used to make ...
- 123
2
votes
How can I convert pre-1950 stereocopic photos to cardboard?
Sure. Most any stereo viewer for Cardboard will take .JPS files. Just scan your postcard as a .JPG and change the extension to .JPS (meaning JPG Stereo)
Example viewer app: 3D/VR Stereo Photo Viewer
...
- 897
1
vote
File formats for stereoscopic 3D images
With stereographic images, proper alignment of the left and right images is very important to avoid eye strain. For example, your eyes will not be happy if an object in the left image is a bit higher ...
- 11
Only top scored, non community-wiki answers of a minimum length are eligible