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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 make robust tests of bitmaps made by NS* Cocoa classes?

I am writing some tests for the Swift code of my Mac application. One of the cases I need to test is: have a NSAttributedString with attachments each attachment is made by a bitmap (1x or 2x), colorised by the code with a custom color draw the…
mbt
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Master report is not generating for all suites with HTML REPORTER (wdio5)

I have setting up a configuration in 'wdio.conf.js' for "rpii html reporter". But its not generating master report for all suites. const { ReportAggregator, HtmlReporter } = require('@rpii/wdio-html-reporter'); exports.config = { reporters:…
vinil narayan
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Using Browserstack, Selenium Webdriver and node.js image comparison library (looks-same) for automated visual regression

Hey I currently using selenium webdriver, mocha, Browserstack and a node.js package called "looks-same" for an automated visual regression. I am just trying to do a simple comparison with a reference image I have stored and a snap shot I get from…
David Ramsdale
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Python libraries failed for detailed image comparison between two shifted images captured using webcam

I want to have detailed image comparison which are captured using webcam. I tried OpenCV and other Python libraries for image comparison which work good when I do any digital change in image that is changes done on image using PC (using Paint). But…
Ujwala Patil
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Comparing two images in android OpenCV usning ORB

I am new to OpenCV and I am trying to write an android code using OpenCV to compare two images for similarities, for my example i loaded two images from Drawable folder as you see in the code, but i am not able to complete the code in order to get a…
wisam
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java code for sift algorithm

Possible Duplicate: Implementing SIFT in Java Hi I need to compare an image with images in database using sift algorithm Can anyone tell where I can get java coding for implementing this concept I am new to java programming and image…
soorya
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How to compare two PIL.Image JPEG photos (same size) using SSIM or a similar algorithm compatible with "pure python" or Pythonista?

I know that similar questions have been asked many times, but still I have not found a satisfactory answer for what I am looking for. I want to be able to compare two versions of the same image, in order to detect the amount of perceptual artifacts…
Victor Domingos
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Compare 2 rotated images that compose a 360 degrees image

I would like to compare 2 images where 2nd image is a 60 degrees rotation of 1st image. Imagine that I have 2 snapshots captured from the same position (both compose a 360 degrees image) - but 2nd image is 60 degrees rotated to the 1st image. I…
Amir
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ImageMagick `compare` precision

Probably a fairly simple question, but I can't seem to find an answer to it anywhere: When using ImageMagick's compare to figure out how different two images are, what degree of precision does the normalized cross correlation metric have? In other…
rpspringuel
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'compareHist' not working for similar images

I have been trying to find matched image from sample image using histogram matching. for most of the cases my code is working fine. The range of used method, Bhattacharyya, is 0 <= method <= 1. normally using Bhattacharyya method the output result…
reza5630
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How to do image analysis in angular js?

I am trying to verify the image which is related to the given title. Once we upload the image, it needs to be verified according to the category selected. eg, if they select a category called 'car', the uploaded image should be a car image or…
sandhiya velayutham
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Efficient way to compare an Image with images in SQL Database

A WebCam captures an image, this image is compared with available the images in a SQL database and a nearest match is displayed in the GUI. The size of each image in database is around 60kb and are stored in varbinary format. Right now, I am…
lerner1225
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Python OpenCV 3: how to use cv2.CV_COMP_HELLINGER

I am trying to compare two histograms using compareHist() function, but I can't manage to insert the right comparing method. In the documentation the options are CV_COMP_CORREL Correlation CV_COMP_CHISQR Chi-Square CV_COMP_CHISQR_ALT Alternative…
Argentina
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How to use SIFT algorithm in php

I am creating WordPress plugin in php so I need to use SIFT algorithm for image comparison from database, but I did not find any SIFT algorithm library in php, only available in c and c++. I have tried to search in google but not get success.…
jay padaliya
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How to determine similarity between two images using Imgproc.compareHist method of opencv in java?

I am using opencv_249 dll in java. Using below code to compare two image matrices. The code is throwing some exception which I am not able to resolve. static double compareImages(Mat main, Mat temp){ main.convertTo(main, CvType.CV_32FC3); …
sharmishtha kulkarni
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