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Questions tagged [image-comparison]

Methods, algorithms and techniques for the programmatic comparison of image data.

Methods, algorithms and techniques by which images can be programmatically compared, either to one another or to a database of extracted image features.

Meaningful image comparison will typically involve the extraction of some of features from the images in question, as metadata. Many techniques for feature extraction (and subsequent feature selection) come from the content-based image retrieval field.

Typical image-comparison schemes necessitate some manner of image processing as well.

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Compare images on python and allow pixel shift difference

After implementing a canny edge detector I have to compare the results to the ones detected by a human, and calculate precision and recall (by comparing each pixel). Both images are binary. The thing is, I have to allow a pixel shift of size one…
Inbaral
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Python image comparison while allowing pixels to shift

After implementing a canny edge detector I have to compare the results to the ones detected by a human, and calculate precision and recall (by comparing each pixel). Both images are binary. The thing is, I have to allow a pixel shift of size one…
Inbaral
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pHash cross correlation of two white images is 0

I'm using Shipwreck.Phash for image comparison. I just recognized that two identical white images return a cross correlation of 0, although it should return 1. hash1:…
AndiH
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Image Comparisons for detecting hand gestures

Hey everyone I have been trying to work on a php powered webapp which would help the special persons in communication. So, the plan is 1) There would be a live webcam where user would make gestures 2) On 3 seconds of idle gesture a picture would…
wweverma1
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Image Comparison with a updating comparison image (PIL)

I need to compare the 1st image from a folder, deleting duplicates, until it finds one that doesn't match. Then it compares the new image with the rest of the picture, repeating the first process. I don't know if I'm forgetting something obvious but…
Daniel Ward
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Issue while comparing two images using Java & ImageMagick

I have a simple solution to compare two images (two screenshots of Chrome browser). To get an image I use AShoot library. To compare two images I use ImageMagic tool. public Screenshot takeScreenshot() { Screenshot elementScreenShot = new…
Saganowsky
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A more efficient way of comparing two images in a python

I have a task where i need to specify the upper left coordinate of the smaller image in the larger image. I implemented this code, however it is too slow since I have a time limit of 20 seconds, and in some datasets I have 3000 images. How can this…
Joe
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Similarity Comparison Between Semantic Segmentation

I have implemented a few algorithms for multi-class semantic segmentation and am now at the stage where I will be comparing them against each other and evaluating the results. I was wondering if there are any best practice methods/formulae for…
Gabriel Lacey
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How to include SlideShow and ImageComparison

I´d like to include this script and this script together. Separately it works like a charm. But from some reason both together it´s not working. I suppose the problem would be somewhere here (probably to correct somehow previous/next slide script),…
chudst
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Algorithms to compare images?

My problem: I need to check if the rendered image on the screen is correct compared to the ground truth. There will be tons of ground truth cases,like rendering a triangle, a line, a circle or more complicated cases. And the rendered image may be…
girafferocks
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Magick.NET How to use .ColorFuzz as pixel tolerance for image comparison

I am new to the image comparison area. I am using C# and Magick.NET (Magick.NET-Q16-AnyCPU version: 7.14.5) to compare screenshots. Using .ColorFuzz I want to implement some kind of pixel tolerance, to ignore screenshots differences. Here is my…
feared
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Is there a faster way of comparing images than Image::Compare in Perl?

This is my current method: #Object to compare images my $cmp = Image::Compare->new(); # Resize images my ($image_1_resized_file, $image_2_resized_file) = resize_images($image_1_file, $image_2_file); # Configure comparison …
nck
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What's fastest way to compare image in python with opencv

I have to compare all frames of video with one image, and with the compare_ssim it took a lot of time. What's the fastest way can I use to compare image with a score of how similar images are? #!/usr/bin/env python # -*- coding: utf-8 -*- import…
Jerry Palmiotto
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Selenium Shutter Bug Issue - UnableToCompareImagesException

I am getting this error, please help me to resolve this issue. com.assertthat.selenium_shutterbug.utils.image.UnableToCompareImagesException: Images dimensions mismatch: image1 - 2880x1340; image2 - 2880x1362 at…
K.Kiran Kumar
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ImageMagick dll and Exe returns two different values for RMSE image comparison

I'm using ImageMagick with version 7.0 installed in my machine. For RMSE comparison for the below CLI input i'm getting some values which are different when i use dll in my c# code. CLI code: magick.exe compare -metric RMSE -subimage-search…
Nikhil Dinesh
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