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Simple tips to gauge the similarity between two images?

I’ve two team pictures for pet and dog. And every combined group have 2000 images for pet and dog correspondingly.

My objective is you will need to cluster the pictures making use of k-means.

Assume image1 is x , and image2 is y .Here we have to assess the similarity between any two pictures. what’s the typical solution to measure between two pictures?

1 Response 1

Well, there a couple of therefore. lets go:

A – found in template matching:

Template Matching is linear and it is maybe maybe maybe not invariant to rotation (actually not really robust to it) however it is pretty simple and easy robust to sound for instance the people in photography taken with low lighting.

It is simple to implement these OpenCV Template that is using Matching. Bellow there are mathematical equations determining a number of the similarity measures (adapted for comparing 2 equal sized pictures) employed by cv2.matchTemplate:

1 – Sum Square Distinction

2 – Cross-Correlation

B – Image descriptors/feature detectors:

Numerous descriptors had been developed for pictures, their primary use is always to register images/objects and seek out them in other scenes. But, nevertheless they provide plenty of information regarding the image and had been utilized in student detection (A joint cascaded framework for simultaneous eye detection and attention state estimation) and also seem it useful for lip reading (can not direct you to definitely it since i will be maybe not yes it had been currently posted)

They detect points which can be thought to be features in images (appropriate points) the regional texture of the points as well as their geometrical place to one another may be used as features.

You can easily find out more about any of it in Stanford’s Image Processing Classes (check handouts for classes 12,13 and 14, if you would like keep research on Computer eyesight we recomend you check out the entire program and perhaps Rich Radke classes on Digital Image Processing and Computer Vision for artistic Impacts, there is lots of information there that can be ideal for this hardworking computer eyesight design you are attempting to simply take)

1 – SIFT and SURF:

research paper assistance site

They are Scale Invariant practices, SURF is just a speed-up and version that is open of, SIFT is proprietary.


They are binary descriptors and are usually really quick (primarily on processors by having a pop_count instruction) and certainly will be properly used in a comparable method to SIFT and SURF. Additionally, i have utilized BRIEF features as substitutes on template matching for Facial Landmark Detection with a high gain on rate with no loss on precision for the IPD plus the KIPD classifiers, although i did not publish any one of it yet (and also this is just an incremental observation from the future articles and so I do not think there is certainly harm in sharing).

3 – Histogram of Oriented Gradients (HoG):

That is rotation invariant and it is utilized for face detection.

C – Convolutional Neural Companies:

I’m sure that you do not would you like to utilized NN’s but i believe it really is reasonable to point these are typically REALLY POWERFULL, training a CNN with Triplet Loss could be actually good for learning a representative function room for clustering (and category).

Check always Wesley’s GitHub for a typical example of it is energy in facial recognition Triplet that is using Loss get features after which SVM to classify.

Additionally, if Deep Learning to your problem is computational price, it is possible to find pre-trained levels with dogs and cats around.

D – check into previous work:

This dogs and cats fight happens to be happening for the time that is long. you can examine solutions on Kaggle Competitions (Forum and Kernels), there have been 2 on dogs and cats that one and That One

E – Famous Measures:

  • SSIM Structural similarity Index
  • L2 Norm ( Or distance that is euclidean
  • Mahalanobis Distance

F – check into other types of features

Dogs and cats may be a very easy to determine by their ears and nose. size too but I experienced kitties as large as dogs.

so not really that safe to make use of size.

You could take to segmenting the pictures into pets and back ground and then you will need to do area home analisys.

When you have the full time, this book right here: Feature Extraction & Image Processing for Computer Vision from Mark S. Nixon have much information about this sort of procedure

You can look at Fisher Discriminant research and PCA to generate a mapping additionally the evaluate with Mahalanobis Distance or L2 Norm