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

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fitting curves to contours with OpenCV and Python

The above image is an example of a lightbox, with some vessels on top. Overall goal is: to find the middle points of the vessels to mark the area of the disk, enclosed by each vessel What I ...
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31 views

Is there a way to detect ambiguous edges?

I'm writing a program that can detect veins(the dark lines) on an arm. When looking at the image at full size, you can easily make out where they are. But when zoomed in around a vein I get ...
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78 views

Adjust rectangle

I have pictures like that one below. Here is a car from the back and some background. How can I adjust rect to fit car better, without free space around? It can be very approximate solution, main ...
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1answer
50 views

Calculate sum of absolute difference per pixel

I am trying to implement a research paper just to verify my results. I have shared the code (written by me) and the description of the process given in the research paper. Unfortunately my results are ...
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21 views

Character Segmentation from the Image

I have made some segments of the image and found the area of interest.I used Sobel vertical detector and morphological operations. Now I want to segment all number plate characters from the image ...
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1answer
25 views

Connecting segmented region in image

I am working on segmenting hands from monocular images and I have already come up with a pretty descent segmentation. The only issues I am having are when people have rings on their finger. Then the ...
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18 views

what is the differences between thin structures and edges in image

I want to know what are the differences between the thin structures (filaments, point, segments) and edges of image. How to detect the fine structure. why the Bi-Laplace operator can detect the ...
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15 views

Traditional Active Contour - Negative alpha

Would it be possible to set alpha to negative so the contour would expand instead of shrinking ? I have tried searching on google but it seems like there is no discussion on it. Seems like alpha is ...
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10 views

Traditional active contour

I am reading on up active contours for my assignment and I have some questions regarding the energy formulation of the active contour. $E = \int \frac{\alpha(s)|v_s|^2 \ + \ \beta(s)|v_{ss}|^2 + \ \...
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2answers
76 views

Segmentation of small artifacts - Image Processing

I am working on a task of segmenting small artifacts from a set of images like below: I am looking for a generic approach, but unsure of what to search? I tried looking at density flow analysis, but ...
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44 views

How image masking works?

I am new to image processing and I am interested how image masking can be used to extract a portion of a image. Have a look at this OpenCV tutorial. In the section Application of Mask, they say that ...
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43 views

How to properly detect segments in a LCD segment display

I have been given the task to develop a code which checks if the display of a device is showing information correctly (i.e. any segments are activating when they are not supposed to). To meet this ...
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37 views

How to classify images based on the amount of colors in the image?

I have a problem where all images have the same object; however, these objects can either have number_of_colors<=3 OR number_of_colors>3 and images are not labeled. My attempt starts by ...
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15 views

Automatic landmarks on images of hands

Problem statement I am starting a project soon where I need to create a method to automatically create landmarks on a set of images of human hands. I do not have a sample image but the images are ...
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20 views

Can Inpainting and Texture Synthesis address same types of image-restoration problems?

Are In-painting and Texture Synthesis used to address different types of problems? For instance, can both methods operate on damaged Old photographs and wooden textures? Are these methods ...
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1answer
36 views

What is the difference between MRF and Total variation in noise removal?

I have a general question in image processing. I have a noisy image. I would like to classify the noisy image into some regions. Two famous approaches I can use are: MRF/Gibbs MRF: Model the spatial ...
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1answer
70 views

How to find a noisy line in a picture

Hi I would like to find a line in a noisy image as showed bellow. I tried gabor filter and cany edge detection, but it didn't produce anything usefull. I am looking for lines of specific orientation ...
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1answer
32 views

Add padding to object in 4-channel image

I have a 4-channel image (.png, .tif) like this one: I am using OpenCV, and I would like to add padding of type BORDER_REFLECT around the flower. ...
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41 views

Gibbs energy in MRF

I am stucking in Gibbs energy in MRF. Firstly, let us define some definition Let $S = {(i, j)|1 ≤ i ≤ m, 1 ≤ j ≤ n}$ be the set of sites of a rectangular lattice for a 2D image of $m \times n$ ...
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1answer
53 views

Generate a nonuniform illumination (bias field) 2D image

I am creating a nonuniform illumination in MATLAB R2015. The nonuniform illumination (known as bias field) is defined as Nonuniform Illumination (intensity inhomogeneity) which manifests itself as ...
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2answers
57 views

Seeking segmentation methods for this light microscope image

Although I am not new to math or programming, I am a total newbie to image segmentation. I have the following light microscope image and I would like to segment it into cytoplasm (the magenta ...
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78 views

Deriving the Euler-Lagrange Equations for the Chan-Vese Model

I am reading the Chan-Vese paper "An Active Contour Model without Edges" and IPOL tutorial "Chan-Vese Segmentation" by Pascal Getreuer. The energy for this model is given by: $$ E(\varphi) = {\mu \...
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32 views

Object localization down to the pixel

I am somewhat confused on the terminology used in Computer Vision. Suppose I wanted to detect (localize) an object (say, a human) in an image. However, a box around the human is not sufficient, what I ...
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2answers
52 views

Detecting Central Axis (petiole/rachis) of a Pinnated Palm

I'm new in StackExchange and I'd appreciate some help. I'm working in an algorithm for detecting "aguajes", a particular kind of palm. So far, I got good results using a texture feature extractor and ...
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27 views

image processing: identifying connected regions based on regions' moments

Assume that I have the following grayscale image: and given that I have, for every segment of the different intensities (i.e. 1 black region with intensity 0, 1 gray with intensity 1 and 4 white ...
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1answer
39 views

What is a good way to locate butterfly in an image

I have some images of butterflies. I've downloaded them from here. A sample is below: In each image, the most prominent object is the butterfly (with flowers, leaf etc in background). I usually go ...
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24 views

What techniques exist for segmenting particles given a priori knowledge of the particle size?

I am attempting to segment the following image, which consists of several circular particles that are surrounded by fringes. My goal is to create a mask that is black where a particle is located, and ...
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1answer
40 views

Saliency Map based on itti model

i want to create a Saliency Map based on itti model via OpenCV(Python). what i'm doing is that: 1- first i change image color space from RGB to LAB color space 2- for each color channel, i create a ...
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1answer
48 views

What type of images are required for voxel classification?

In an algorithm, voxel classification approach is used to perform image segmentation. The aim was classifying voxels either as ...
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21 views

Character Recognition

Currently I am working on character recognition in a natural image. I know there are many approaches to implement OCR. But in my case the desired font family and size is fixed which make things a ...
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1answer
44 views

How to quantify area of interest in an image?

How to find the percentage of a certain colour in a image accurately? For example I am actually trying to find the percentage of barnacles in this image over the red part of the hull. http://thumb1....
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24 views

Counting percentage of fouling on a surface

I am completely new to image processing and python. I hope I can find some help here. I am trying out a project on detecting fouling% on a ship hull using raspberry pi. I am trying to learn how this ...
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11 views

How is per-class rate defined?

I've recently read the following For our pixel labeling, consistent with [20], we report the number of pixels correctly classified (per-pixel rate) and the average of per-class rates. The per-...
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20 views

what is this mean?“the input image is centered…the mean image…”

in paper-"DenseNet: Implementing Ecient ConvNet Descriptor Pyramids", I can't understand what does this sentence mean- "As a preprocessing step, the input image is centered by subtracting the mean ...
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1answer
49 views

What is the best approach to classify an image containing either text or image?

I am doing a research about image-based User Interface (UI) Analysis, and while UI image-based analysis is not more complicated than normal image analysis, I was able to do a segmentation process to ...
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137 views

OpenCV's BackgroundSubtractorMOG algorithm parameters

Does anyone know what the history and number of Gaussian mixtures do in the Gaussian Mixture-based Background/Foreground Segmentation Algorithm used in OpenCV? I'm trying to optimise a background ...
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2answers
57 views

The model of noise in Image denoising problem

I am studying the image denoising problem. The paper I studied uses Gaussian Noise to model the noise appearing on the image. E.e., If we say $u_g$ is a clean image, then we model the noisy image $u_0$...
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2answers
73 views

Magnitude of Sobel filter result, vector or scalar?

I have a question about image gradient magnitude, given an image $I$. The horizontal and vertical derivatives resulting from Sobel filters are defined as: $$K_x= \begin{bmatrix} -1 &...
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2answers
56 views

How to represent a given equation more clear, profressional and short form?

I have a image $U_{m \times n}:\Omega \to \mathbb R^2$, the output $P$ can be define as $$P=\mu J_{m \times n} - U$$ where $\mu = \max \{ u_{ij} : 1 \leq i \leq m, 1 \leq j \leq n\}$, $J_{m \times n}$...
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1answer
45 views

what is “description vector” in image processing?

When we want to use classifiers like SVM, we first should extract descriptors using algorithms like SIFT. But I have a question which might call a silly one: Let's assume $$ \begin {equation} D_a=\{...
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2answers
83 views

Segment highly packed nuclei with dotted high intensity signal inside each object

I collected high magnification images on cell nuclei and I need to segment them (red circle in the image). The edges of the nuclei are visible but inside each nuclear object there are bright spots of ...
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3answers
73 views

selecting bricks from image

I have an image of bricks of different sizes. What I want to do is when I click on the corner of the brick it should mark the lines around the brick. Can anyone please help me how can I do that... ...
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14 views

what is near-duplicate detection?

Literately, Near-duplicate detection is for finding very similar image in application where the main goal is finding violated copyright material. but what does this term mean when it comes to image ...
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1answer
50 views

What is “find-grained” image?

What does exactly and precisely the term "fine-grained" mean in image segmentation? For example, undeniably, the picture below is a fine-grained image: But is it correct to call below picture as a ...
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1answer
138 views

How we calculate Precision-Recall Curve?

As far as I know, precision and recall are two single values. How we can plot a curve from these two single values? I think I should calculate a set of values for each of them but how? afterwards, ...
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1answer
36 views

Converting blobs to circles

I have this binary image with some blobs of random sizes. I would like to convert the blobs into circles of uniform diameter. it doesn't really matter what diameter but they need to be circles and ...
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1answer
91 views

Filling hatched areas in image

I'm trying to extract / fill the walls in a floor plan, the walls are filled with a (cross-)hatch pattern at a more or less fixed angle. I've managed to remove most of the "noise" by masking the DFT ...
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28 views

Segmenting simple objects without shadows

I am trying to segment very simple objects like boxes and bottles. I am using GrabCut and it works extremely well when there are no shadows or when the shadows are soft - but as soon as there is a ...
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1answer
22 views

Convergence criteria for Active contour model

Currently, active contour convergence is checked visually. So how can we set a convergence criteria? I looked into some unsupervised segmentation method for image segmentation but couldn't got a ...
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1answer
93 views

Identify large solid color areas of image

This is a simple image classification problem. I want to categorize jigsaw puzzle images to difficulty levels (e.g, easy, medium, hard). I want to develop an simple algorithm for this classification, ...