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

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How to prove $\int_{\Omega} \sum_{i=1}^{N} f_i(x)dx$ is equivilant with $\sum_{i=1}^{N} \int_{\Omega} f_i(x)u_i(x)dx$

I have a 2D image defined on a region $\Omega$. Assume that the region can be separated into $N$ sub-regions $\Omega_i$ such that $$\forall i,j=1... N:\Omega_i \cap\Omega_j=\emptyset$$ and ...
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10 views

To estimate the uncertainty of Slicing holes from an image?

I am thinking to estimate the uncertainty of holes photographed from the bottom and top side. The difference of the same hole photographed from two sides is distributed as Gaussian. The length of ...
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8 views

Multi-object image segmentation methods

I want to survey the state-of-the-art in image segmentation. Is there a paper on how to segment multiple objects in an image? The segmentation papers I read, normally identify one of the many objects ...
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9 views

Compute the Gibbs energy for second-order neighborhood

I have a question about Gibbs distribution in Stochastic theory. In which, it defined a clique as a a subset $C$ in the whole image $\Omega$ if two different element of $C$ are neighbors. Figure 2 ...
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4 views

SIFT: Finding unstable and stable intervals in interval tree

I try to understand SIFT. I have watched a couple of videos but still cannot catch the point that how we can mark an interval 'unstable'. What is exactly the definition of 'stable'? According to ...
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1answer
33 views

SIFT: why it is invariant to affine tranlsation?

I am studying SIFT. I am a little confused in some of Lowe's algorithm. In order to have a descriptor invariant to translations like scaling, we must get rid of the scaling factor in LoG (Laplacian ...
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21 views

eliminating white areas without sharp boundaries

I have images of following type: and As one can see, in the corners of the images there are white areas which don't have sharp or well defined boundaries; the intensity gradually decreases. ...
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6 views

What is the difference between 2D and 3D brain tumor segmentation in MRI images?

are we using jpeg images for 2D and DICOM images for 3D segmentation? what are the algorithms used efficiently for 3D medical image segmentation
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1answer
25 views

Which anatomical model to use as “ground truth” for validating an MRI segmentation method?

I am research in brain segmentation task that classify a brain in to 3 classes : White Matter, Gray Matter and CSF. To validate my method, I used Dice Coefficient that compare my result and ground ...
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32 views

Image segmentation: Grabcut versus Level-set

Checking the literature about image segmentation, if I am not wrong, there are two main approaches: Variational approach e.g. level-set optimization in Chan-Vese Combinatorial approach e.g. using ...
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12 views

Understand about registration between spatial prior and original image

I am working in level set/active contour method using spatial prior information . The main papers that I am focusing:"Automatic segmentation of neonatal images using convex optimization and coupled ...
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1answer
74 views

denoise image MATLAB/Octave Gaussian noise

I want to remove a noise for an image using MATLAB, when the observed image is $$f=u+v$$ where $u$ is the restored image (is the image i want recovered) and $v$ is the gaussian noise. To restore ...
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23 views

Understand the assumption of the ideal bright line in this paper

hope I ask my question on the right place. I am a student and my favorit subject is computer vision. I try to understand some apects of the paper "Three-dimensional multi-scale line filter for ...
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3answers
47 views

Segmenting and labeling chessboards through computer vision

With almost no experience/knowledge in computer vision, I am currently trying to segment and label the separate squares on a chessboard (i.e. a1 ... h8). My goal is to use the information to ...
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111 views

Bounding box around text given a single point inside text using opencv

I am trying to figure out a way to detect a "best-fit" bounding box around a text, given a single pixel(or a small set of pixels) inside this text area. Consider the following image: Given the ...
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34 views

How to detect spheres in SEM (scanning electron microscope) images?

I want to determine the distribution of micro glass spheres in SEM (scanning electron microscope) images, which can be obtained after finding the contours of the little spheres. I think the ...
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1answer
109 views

K-means for 2D point clustering in python

I have a set of points(2D) whose pixels are set and want to perform k-means on these pixels. Is clustering the 2D coordinates the right way ? If so, can that be done using any libraries in python ?
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1answer
149 views

How to learn image processing / computer vision in a practical way?

I am new to the field of image processing / computer vision and I find it very hard to get my hands on the subject. I read a lot about the basics/theory but I feel in no way able to use this knowledge ...
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15 views

character segmentation

I met a problem in my LPR project. After extract the license plate image I need to segment the character in the license plate image. So first I did some morphological operations and convert the gray ...
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37 views

Sobel Filter Operatios

I have an image which has a vertical line which is 2 pixels wide and 4 pixels long and the remaining image is black. Now I want to find the edges in the vertical direction and for that I use the ...
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22 views

How to implement extended structure tensor

I am implementing an extended structure tensor that defined as where (*) is convolution operator; K_sigma is a Gaussian kernel with standard deviation sigma. The subscripts x and y denote the ...
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1answer
36 views

Image region-based representation

I have a homogeneity image that includes two regions $\Omega_1$ and $\Omega_2$. How to represent the image by decomposition of two regions? For example, the famous way is representing by the mean ...
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19 views

How to represent the relationship of pixels within a cluster

I have a question about image processing that need your help. I have an image I that includes foreground (FG) and background (BG) regions. I want to represent the relationship of pixels within these ...
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2answers
42 views

Good inhomogenity measures in images?

Can you advise me on good inhomogenity measurements in an image? I am trying to find the borders where homogenous zones touch inhomogenous ones in a image. I am going to work with sick lung ct ...
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2answers
93 views

Image segmentation algorithm

I wonder if there are algorithms used to segment images efficiently. The ones I tested by now can not segment hair correctly as on this image: I just want to know if someone can give me some ...
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1answer
100 views

3D intensity map for grayscale image

I've got images of blood drops in grayscale and I want to generate 3D data where the first two dimensions represent the area of interest and the 3rd dimension represents the pixel intensity of that ...
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12 views

How the weight $ω_{i,t}$ is initialized in Background subtraction GMM (Gaussian Mixture Model)?

I read Chris Stauffer paper "Adaptive background mixture models for real-time tracking" about Gaussian Mixture Model for background subtraction, but they're not explained very detail about $ω_{i,t}$ ...
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45 views

How to straighten the edges?

Are there standard efficient ways/algorithms to make edges in an image more straight or axis-parallel (horizontal or vertical) ? I have images that look like this: This is part of a segmentation ...
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17 views

Aligning frames with common elements

I am new to image processing and had the following question: I have take some 512-px grayscale images. The images were take in such a way that all images were of the same spot, but there was some ...
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1answer
152 views

What preprocessing technique can help me to filter the background text noises using matlab…the image is shown below?

Can anyone help me to improve the degradation of the following image....i am working on OCR system in Amharic language and what is the best image filtering technique that can help me to separate ...
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34 views

How to programatically perform image segmentation in real-time

I am currently trying to segment ultrasound images of blood vessels (video frames), such as the one directly below. Using a simple binary filter on the saturation channel (code below), I can get a ...
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21 views

How does Arbib's clustering method work?

Recently in Image Processing I've been studying image clustering (or segmentation) methods and one of them is Arbib's. I understand the main idea behind it from which you start with one cluster with ...
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2answers
273 views

Segmentation of overlapping noisy parallelograms in a binary image

Edited. Previously this question was named "Segmentation of overlapping pulses in a binary spectrogram" and it was stated in slightly different way. I'm apologise to those users, who were affected by ...
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213 views

How can I make the background color white for this Grab-cut algorithm written in Python?

I am new to Image Processing and am using Grab cut algorithm to extract the foreground objects from images as a part of my project. Below is the code written in python to do the same. The problem is ...
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69 views

How to segment object when it has similar histogram with background

I am working in image segmentation and I would like to ask you something about my problem. I have a image such as bellow. I want to segment leopard from background. However, intensity information is ...
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74 views

Small Font Arabic OCR character segmentation

I'm working on an Arabic OCR , it already works on font sizes 20, 30, 40 and 60 pixel height, currently I am trying to make it work on 10 pixel height, as I mentioned here before I tried first to ...
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14 views

CT image segmentation

I have two CT images reconstructed from a Shepp-Logan simulation, but they suffer leakage artifacts. Although they are distorted, the two images contain all the structure information. I was ...
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4answers
106 views

Is this image good enough for OCR?

Hello I'm trying to ocr on a special image. I've done adaptive threshold , polartocartesian transformation. this is my original image this is adaptive threshold this is polartocartesian ...
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48 views

Gap Filling Contours / Lines

I have the following image: and I would like to fill in its contours (i.e. I would like to gap fill the lines in this image). I have tried a morphological closing, but using a rectangular kernel ...
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1answer
64 views

How to choose suitable segmentation process for image processing

Hello I'm new on image processing. I know there are a lot of threshold and region growing algorithms to use. But I would like to know what is the trick for choosing suitable method for an image ? ...
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1answer
40 views

How can Recognize handwriting number [closed]

Which algorithms should use to recognize handwriting numbers from an image?
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126 views

Image Segmentation - Berkeley Dataset

I've been given an image from Berkeley dataset to segmentate. I am an undergrad student and so far I threw everything i know to this thing. But the colors are extremely close. I tried; Clustering ...
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45 views

What is the difference between Harris Corner Detection and SUSAN Corner Detection?

What is the difference between Harris Corner Detection and SUSAN Corner Detection
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41 views

Bit Plane Complexity Segmentation (BPCS)

I am working in digital image steganography. Although I am novice but implemented some of LSB substitution based steganographic methods. Now want to implement Bit Plane Complexity Segmentation ...
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22 views

Need good resources to study 'Speeded up Robust features'

My current project is about Speeded up Robust features(SURF). I am a beginner in Image processing and new to this concept. Even though i found a lot of information on Internet, i am not able to find ...
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123 views

how to get segmented OPTIC DISC from retinal image?

i have been segmented some image of retina. but the result is not good as i hope. for one image i can get good segmentation, like this image my code is from some reference in internet, in below i ...
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28 views

How do I remove the skin reflection from an ultrasound image?

I am trying to segment the fetal part from an ultrasound image. Most of the algorithms I have tried include the uterus skin reflection along with my region of interest. Is there a pre-processing ...
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49 views

Polygon Segmentation technique

I am working on Automated GUI components Segmentation problem. My Images are very simple as it has GUI components such as Buttons, text box and other polygons as you can see in the diagram (a). ...
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31 views

Some questions about the cube map representation

I am reading a text about cube map representation, but it seems I am confused. How the cube map representation can be used to detect lines using $xn_x+yn_y-d=0$? (we can ignore the polarity of lines.) ...
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79 views

Best segmentation method

This is part of my samples ...