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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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How to get mismatch ratio of two images with imagemagick?

I am looking for faster alternatives to ResembleJS for image comparison. So far I am able to create the similar output image like ResembleJS does: convert fullhd.jpg \ \( -clone 0 fullhd2.jpg -compose difference -composite \ -threshold 1% -fill…
mirza
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aforge image comparison with UWP

I'm using portable.aforge.imaging for image comparison on a UWP project. The method ProcessImage requires Bitmap type as arguments. I'm using System.Drawing to access Bitmap class, but i'm getting errors when i try to instantiate: "Bitmap does not…
Xaren
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Finding difference in an image

I have image as follows: I want to detect 5 dials for processing. Hough circles is detecting all other irrelevant circles. to solve this i created a plain image and generated absolute difference with this one. It gave this image: I drew box around…
Saghir A. Khatri
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Comparing two images, where one is downloaded

I'm comparing two images; the source is in my solution (and saving it to memory stream) and other I am downloading using 'WebClient' converting it to bytes and then saving it in a stream, then comparing the streams. They are exactly the same image.…
marwaha.ks
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Image comparision in python

My objective is to find the difference between two images. The images are black and white engineering diagrams. Input will be a pair of diagrams of same component. One will be old diagram and another will be new diagram of the same component. My…
Gokulram
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opencv 3 python euclidean transformation

After calculating the matches between two images that are rotated and shifted, how do transform one image so that it can be compared to see the difference with the other image?
JoeD
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How can I identify bullet holes by comparing images taken from different angles?

I have two images of a shooting target (4 meters by 4 meters), divided into sections of 0.5 meter by 0.5 meter squares. The images are taken before and after a firing trial. The target has already bullet holes on it before the firing. Moreover,…
niw3
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Image Processing and comparing in java

I need to compare two images of similar kind but both have different size in JAVA, i.e one has low background width and another one has high background width. And size of images are also different. I have attached two files. In which person and…
NIket
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How to detect and clasify materials in an image using data science/computer vision?

If a picture contained plastic, cloth, metal etc. how can one train the computer to segment out materials of the same type. Please add if any other method can be used as a starting point for the problem.
susheel
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What is equivalent of opencv comaparision operator in python

Following are the ways of doing comparison in C++ and java C++ image < 100 Java Core.compare(image, 100, mask, Core.CMP_LE); How this can be done in python?
d32
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Compare similarity of relatively dissimilar images [websites] with one another

I am looking to calculate some sort of '% similarity' between two screenshots of websites. I am specifically looking to calculate how a particular website changes over time (i.e. to determine which websites tend to keep a consistent look), and also…
kyrenia
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compare image similarity using php

I am searching for a way to identify similar png images with same size. The images are not the exact duplicates. For example If one image has a clip art of a bird, and another image has the same clip art but it is rotated, I want to identify both of…
Tharu
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Why does comparison with UIImagePNGRepresentation not work?

I have a button which should represent a Checkbox. When the button is clicked, the imageView.image-Property is set to another UIImage. So, I have two variables for the checked and unchecked image. UIImage *checkedImage = [UIImage…
Nerdine123
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ByteBuffer stores -1 and 0 values from BufferedImage.getRGB() NOT 1 and 0

I'm currently working on a program that stores RGB-info from two images to compare them. I created two example images with paint.net. Both are 16x16 and one is BLUE and the other one is RED. I set the value in paint.net to (255, 0 ,0) in the RGB…
BigPenguin
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Does size of two images being compared matter if md5 comparison is done?

I have two compare two images usinf md5 digest comparison. If the size of the two images is different will it matter?
prosody
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