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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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calculating image similarity of two "line drawing" images

I am developing an Android app for kids to learning writing letters, one function is to rate their drawing of the letters,I am stuck on how to determine whether the drawing is in good shape. What I am doing now is saving the drawing as a image and…
gherkin
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Image-recognition with opencv on Android app

I'm trying to do an android app. The idea is to make a picture of a road sign, the app compares that picture with a database that contains all the road sign and, if it is matched, it gives me information about that sign. I kwon that OpenCV is great…
user2919607
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Comparing two byte arrays which represent two pictures

I am programming a small application for android and I need to compare between two pictures. The pictures are represented as two byte array. Is there an algorithm to compare between them? I need to check the changes which has been made between them.
Shiran Maor
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Finding Duplicate or Similar Images on a specific directory on a database

I am new on this, and my objection is to build some web application that implement the user to store an image on a database as a storage, and all I want is to reduce if there is a couple or some image that stored twice or more. So, all I need is…
AdityaSetyadi
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Compare two images using OpenCV in Android

I need to develop an app that captures the picture using Camera API and compare that picture with all other pictures in the database. For comparing the images i'm going to use OpenCV. But i'm new to openCV. I have set up the openCV in Eclipse. But i…
mithu
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How can I get the rectangular areas of difference between two images?

I feel like I have a very typical problem with image comparison, and my googles are not revealing answers. I want to transmit still images of a desktop every X amount of seconds. Currently, we send a new image if the old and new differ by even one…
seibelj
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Is my segmentation accurate?

I have segmented liver from CT images using Region Growing. I need to calculate RMS error between the reference image and the segmented region. When I run the code, I get an output of 1.1146. Whwn I rearrange the order of inputs, I get a value of…
Gomathi
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Histogram comparation for Content Based Image Retrieval. Different color spaces (RGB,HSV,etc..)

I'm doing a final degree proyect in Content Based Image Retrieval using OpenCv. I have started comparing histograms. The thing is that I have seen a lot of post saying that RGB is the worst color space to operate, and it's better to use HSV or YCrCb…
mapetilan
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How to pre-process brightness and contrast to find accurate differences between images in Python?

I am making a program that compares and points out the differences between the two images using the skimage library. def get_structural_simlarity(first_image, second_image): print("[Console] Calculating differences") # Pre-process Image …
Anh Phan
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compareHist openCV with multiple dimensions

I am working on image colors comparison and I am struggling with understanding how cv2.compareHist works for multiple dimensions. Here is my issue: if I take every channels in compareHist I find a inverse result in distance than if I take each…
Wolf
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Python PILLOW Can't compare two images correctly

I want to compare two images and then decide whether they are the same or not but the PIL library is not able to tell me the correct result. Even I use both ways to compare them it returns true for two different grayscale images. difference =…
ghostcasper
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what is the best way to upload bulk file on aws s3 using react and nodejs

currently, I am uploading images using the "react-aws-s3" react module but I also want to check duplicate images with previously uploaded images. so I thought to upload images from the backend to overcome load on the frontend and apply images…
Ritesh Panchal
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How to save phash in MySQL 8 and calculate hamming distance?

I am trying to find similar images within a MySQL 8.0 table compared to a given phash. The phashes are generated via python and currently stored within a varchar(255) field. Typically they look like this: ae95916ec1354a9d My query is supposed to…
merlin
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check if two images are equal

def images_the_same(image1, image2): """ :param image1: path of image1 :param image2: path of image2 :return: True if images are the same, False if images are not the same """ im1 = cv.imread(image1) im2 =…
agronom
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Image comparison by pixel neighborhoods

Given two images of the same scene with potential alignment, focus, lighting differences and noise, I am looking for an operation that I can run on these images that produces another image of the difference between them that minimizes these…
DanGoodrick
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