Computer Graphics Stack Exchange
Computer Graphics Stack Exchange

Questions tagged [image-comparison]

10 questions
8
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1 answer

Brightness and contrast VS Gamma, is it possible to identify the gamma "correction amount"?

Trichoplax question aroused my curiosity and the answers in this question also reminded me why I sometimes use different gamma "amounts" to enhance images. Therefore, is it possible to determine the amount of gamma applied to an image by knowing its…
Armfoot
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3
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1 answer

Relationship between spatial frequency of an image and Aliasing

I was looking into measuring the amount of aliasing in an image. After reading through many papers and sites, I came to the conclusion that the best method to measure the amount of aliasing in an image is by utilizing the frequency domain. Is there…
Varun Vijaykumar
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3
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1 answer

Image regeneration with nearest neighbor search

So what I would like to achieve is this: User submits Image 1 - this image is then broken down into X by X sized blocks User submits Image 2 - then the program/algorithm takes all the blocks generated in the above step, and reconstructs Image 2…
Joel Damien
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3
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ImageJ alternative for Ruby on Rails Development

I have an analysis management web system developed using Ruby on Rails and I need to analyse an uploaded image in my system. Using Java I used to have ImageJ included im my projects. Since I'm new in Ruby on Rails I don't know any library/gem to…
Mout
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2
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2 answers

Why isn't PNG preferred over JPG for being lossless art quality yet?

This is something that pops up on my mind once a while when I browse around the web for art and desktop wallpaper, since I tend to see JPG and PNG as the common formats. I just had to ask to get it off my mind, hopefully I've posted in the correct…
Nova
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how to compare two slightly different images rendered by two programs

I rendered similar images using a Vulkan and an OpenGL ES program. Supposedly the two programs should generate the same result, so I want to test it by comparing the two images. However, the camera settings, the size of the images and so on make it…
Lily
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Visualize the variance of an image

Let $h_j$ denote the image reconstruction filter of pixel $j$. I'm estimating the color value $$I_j=\int h_jf\:{\rm d}\mu$$ of the $j$th pixel (see [Veach, Section 8.2]) by an asymptotically consistent estimator whose asymptotic variance is given by…
0xbadf00d
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How to change a picture to fail comparison algorithms?

Is there a way to change a picture so it would fail to match against existing copy of the same picture on the big social networks such as Facebook, Twitter, Instagram, Tinder and others? Desired result should be as close as possible to the original.
Caballero
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0
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Is it possible to get recording device from meta data?

Im not sure if this is the right section to ask this question but i figured its worth a shot. Is it possible to take metadata from a video and use that data to identify what phone model was used to record that video, like iPhone X, iPhone XR, iPhone…
xanttt
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Aligning (matching) colors (white balance, brightness) of two scenes based on reference object

What I am trying to do is to become able to compare with reasonable accuracy two real world fabric/textures (colorwise speaking) at two distinct locations. I can't move them into single place to observe them close to each other and in the same light…
Przemek B
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