Questions tagged [image-segmentation]

image-segmentation refers to the process of partitioning a digital image into multiple segments, typically to locate objects and boundaries.

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17 views

How can I stitch bottom of some image to topside of another image by erasing as much overlapped image as possible?

I have 2 images of size 1920*1080 and I want to try image-stitching on them. These are images (images are from wind turbine blade.) This is the first image And the second image. I already have ...
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33 views

How to get the area(Pixels count) inside ring-like shape?

I have the following image, and I do like to count the pixels inside the ring to get the area. I did some morphological operations as a kind of post-processing to make the image as much as possible ...
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21 views

How can I implement Guided Random algorithm walker matrices?

My Question is related to the implementation of the paper Segmentation by retrieval with guided random walks: Application to left ventricle segmentation in MRI After careful reading of the code of the ...
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Question regarding the implementation of the guided random walks algorithm

I'm working on the implementation of the paper: Segmentation by retrieval with guided random walks: Application to left ventricle segmentation in MRI. I tried to modify the weights functions mentioned ...
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How do i calculate the accuracy of an algoruthm?

I'm doing research on an machine learning image processing algorithm (segmentation algorihtm)i.e. computer vision performs when an image takes as an input and objects in an image are segmented and ...
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120 views

Image Processing on Raspberry Pi

What are my options for Open Sourced Image Processing functionality on a Raspberry Pi? So, I am referring to the old-school processing, using operators like open/close/erosion/dilation/threshold/...
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Adaptive threshold value transformation based on brightness

This is the homework of my son: My wife gets such images taken with a mobile phone form other mothers, whenever my son misses a lesson. She can not print those images, because they are almost black, ...
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50 views

Is HSV Color Space Sufficient for Rudimentary Color ID and Edge Detection

I want to, as part of a C++ school project (no OpenCV), work with an RGB image taken from a camera filming smarties (round colored pellets) from above and extract the number of candies in each color. ...
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active contour without edges

i am new to image segmentation.i am studying chanvese ACWE paper1.This is level set equation of chan vese paper ACWE. Above, μ,ν,λ1,λ2 are real parameters, c1,c2 are constants determined for ...
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Finding Duplicate Pixel/Objects along Image seams

I have a seam of two photos joined by a seam alignment algorithm that on occasion generates duplicated pixels/objects/artifacts on both sides of the seam in the final, aligned photo. The images are ...
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What does dynamic range values in SSIM image quality technique refers and how to calculate?

http://en.wikipedia.org/wiki/Structural_similarity Below is java implementation of SSIM. ...
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32 views

Create a mask like DAVIS dataset

I am testing the dataset DAVIS from here with one of the papers it has. The codes works fine with DAVIS dataset but it does not work for my data. In particular, the code does not accept the mask I ...
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Detect circle using Hough transform

I am new to image processing and try to learn how to detect circles using the hough transform in Matlab. I have a shortcode that seems to contain no errors but when I run it I get the image but with ...
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65 views

How to sharpen hair strands in an image?

I have an image like this: I am trying to build a semantic segmentation and matting model which currently gives an output like this: One can see that some regions between the hair strands are fuzzy....
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Approaches to Segmentation in images of water surface

this is my first question here. Therefore please help me inform me when I miss any good practice in asking questions here. Given a short video sequence of an water surface, I would like to detect if ...
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unsupervised local texture segmentation

I'm working on a problem where I need to segment a 3d image (unsupervised) based on locally computed texture parameters. So far I've been using a sliding box approach, computing various texture ...
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How to make ground-truth image for document image binarization task?

The two images are from DIBCO (Document Image Binarization Contest). The objective is to find a solution to binarize the top image (original image) to be similar to the bottom one (ground-truth image)....
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Logical Steps to segmenting Lung Fissure Structures

I am given the task to do the Lung Major Fissure Segmentation in a CT image to find it's position in an image. This is what a Major Fissue looks like: https://www.med-ed.virginia.edu/courses/rad/cxr/...
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Thermal image based segmentation [duplicate]

I'm working on a project to do segmentation of thermal images. So far, the methods have produced limited segmentation performance (k-means, Otsu's Method, Sobel, Canny, LoG). I am trying to achieve ...
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Size filtering on binary images

I have noisy images from which I extract the contours using OpencCV's findCountours, which performs binarization internally. This results in innumerable small ...
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Does anyone have any experience with using the David Stutz superpixel benchmark?

I have been trying to compute the statistics of my image segmentation algorithm by using the superpixel benchmark as given on the link https://davidstutz.de/projects/superpixel-benchmark/. I would be ...
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39 views

MATLAB Image-Processing Toolbox: asking for a roadmap!

I plant trees in the north of BC for a living and have next to none sp experience, please be gentle :^] TLDR: The problem is essentially this: tracking and calculating the "height" of three ...
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Camera obstruction detection

I'd like to detect if camera view is obstructed (fully or partially) by some object (paper, hand, some device, etc). Do you know any good methods for this task? I've already experimented with: RGB ...
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How to create 3D signed distance function?

I am trying to segment a 3D shape using levelset. I want to track shape movement in consecutive frames. Now I want to create a signed distance function matrix for ...
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How to segment blood vessels and detect malignant? [closed]

I have a task of segmentation of retinal blood vessels from fundus images an the same time detect malignant. so the output images should contain both segmented image and detected malignant. I am using ...
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53 views

Best colour to detect

I am using emgucv with opencv. I have an object I wish to detect based on colour. I convert the image to Hsl colour space and perform a filter on it. The object I am detecting is perceived as yellow ...
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114 views

How to Remove the Patch Artifacts of Neural Network Denoising Process?

I have written a python script which uses the Noise2Noise: Learning Image Restoration without Clean Data implementation of the Auto Encoder which is useful to remove noise from images. In the original ...
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175 views

How to extract a smooth contour from a set of points in 3D?

I am trying to segment a 3D volume. The outcome of all my volume segmentation algorithms is a set of candidate points in 3D space. Now I need to smooth this point cloud and fit a closed surface it. My ...
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181 views

Microscopy crystal particle object length detection

Hi I try to detect the particle length size from this image and I'd like to get the length size of the particle Like this below. and get the histogram of the size of the particle using centroid and ...
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64 views

Crop all written letters from single image

Above image has handwritten hindi / deavanagari letters all on a single image. Task is to Prepare a dataset from the given assignment.jpg image using image processing tools Idon't have clarity ...
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34 views

Finding Local mean value of pixels of window

I want to solve the equation (2) in the attached picture which tells the local mean value. But i don't have any idea about how to evaluate this equation using matlab code. could only guess w indicates ...
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Extract Rectangle from image

Given this image: How can I extract the 'rectangle' my arm is holding up? I know about closing, dilation and erosion etc but I still manage to get artefacts of my hand included after filtering. ...
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242 views

How to set sigmas and kernels for 3D-Laplacian of Gaussian filters to blob detection in Matlab?

I have written code according to a paper for Lung CT images, but its output wasn't correct. I think it is because of the setting of its parameters. The paper is about a multi-scale method using a ...
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33 views

Can Normalized Cut be used to find connected components in binary images?

I'm unsure whether Normalized Cut can or can't be used to find connected components in binary images. I would argue that it could, but could not validate this argument.
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80 views

LSM level set method vs thresholding

I am trying to understand the LSM algorithm applied to grayscale image segmentation. There are essentially 2 things that are blocking me: 1) From my point of view - the level sets - i.e. ''moving'' ...
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55 views

MatLab-Finding error in hough line transform

Can I calculate the number of error in Hough Line Transform using MatLab? I did Hough Line Transform process from Canny Edge Detection, but it is unable to detect all the lines. Thanks.
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93 views

CIE-Lab changes on Light intensity changes

I am planning to use CIE-Lab color model for an image segmentaion method. If the light intensity of sun, some led source changes on the objectm then does it affects the a and b value of the data ...
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1answer
289 views

Fitting a grid to points in a 2d space

I have this problem where I have multiple points in a 2D space. A subset of these points makes up a rectangular grid. Some points of the grid might be missing. The shape and number of points the grid ...
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64 views

Segmenting an image into columns

I want to segment the image below (click for bigger image) into columns based on the natural gaps that exist in the columns. The columns should be perfectly vertical and need not be the same size, but ...
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1answer
396 views

How to segment multiple overlapping coins (ellipses)

I am doing a program that counts coins (and tells their value by their size) with OpenCV (C++). Let's say we have an image of some coins. If there is an overlap of two coins at the same time, it is ...
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309 views

Red Blood Cell Color Image Segmentation

I want to segment this Red Blood Cell Image on HSI color space.I want to try the Otsu Method but from what I read that method work only on Grayscale image.Do you have any suggestion for suitable image ...
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61 views

What is a basic method to segment “dark blobs”?

I'm new to image processing, but I have good knowledge of general data processing. Could you please suggest an approach which can be used to segment images like this? I suppose it is some kind of ...
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3answers
898 views

How to determine if a pixel is inside a contour?

I have following picture which I extract the contour from. The contour looks like following I am wondering, for any pixel in the image, how do I determine if it is inside the contour or not? Say "...
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25 views

Lighting for computer vision automisation

Currently I am working on a computer vision project where we want to gather data from a composite material production environment. I have an example picture here: What I learned so far that my ...
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1answer
118 views

Circle detection with incomplete edges

I want to detect circles in the image below but this approach, of using cv2.approxPolyDP on contours and counting the sides of the polygon, doesn't work here since some of the circle is missing. Is ...
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67 views

How does reconstruction function relate to watershed segmentation?

I'm trying to understand how watershed work by reading The Morphological Approach to Segmentation: The Watershed Transformation S. Beucher and F. Meyer This document mentions the reconstruction ...
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Fast Calculation of Legendre moments in images using kernel-separability

I am implementing zero order approximation method to calculate Legendre moment of an image. One simple way to calculate moments is directly using loops and calculate the double summation as given in ...
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2answers
276 views

Image processing: How to find center of biggest blob in an image?

Let's say I have an image like this one, and have masked it so all yellow pixels are 1 and all black pixels are 0. I would like to (1) fit the largest possible circles containing solely yellow pixels ...
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1k views

What is the application difference between extent and solidity in image processing?

I've come across the image object properties, "extent" and "solidity." Definitions are pretty straightforward to understand: Extent of an image object is defined as area of the image object divided ...
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Double Threshold Mechanism

I was studying an article about optical music recognition. Somewhere in segmentation section is mentioned that The final step consists of isolating the note heads. This is performed by using a ...

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