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 caclulate local gradient of image

I have a question about local gradient. I know that gradient function is support by matlab. But for the local gradient, it does not support. Do you know how to calcualte local gradient of a given ...
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0answers
22 views

Which method overcome false edge problem [on hold]

I have one problem that is false edge problem. Given a image with real edge and false edge. How to detect where is real edge? Which method?
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2answers
72 views

Otsu's method problem?

I have a problem with Otsu's method. I would like to implement histogram to compute how many ones' and zeros'. For Otsu's method, I have a code from a book and it is running without problem. This is ...
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1answer
49 views

Best method to segment a given image

I have one image. I want to segment it by simple approach. Could you suggest to me the best method to segment it? I think one of them is gradient or FCM. But I am not sure. Please see my given image ...
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3answers
71 views

What is benefit when convert signed 16 bit to unsigned 8 bit in medical image?

I have an image with its type is 16 bit signed. I see some paper, the author often convert it to unsigned 8 bit. But they did not explain why they do it. Could you explain what is benefit of this ...
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3answers
69 views

Best way to remove unwanted region from image

I am finding the techniques to remove unwanted regions (small dots) from image. I have an image that includes object and some unwanted region (small dots- see first image). I want to remove it. Hence, ...
3
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0answers
98 views

Malaysia Flight 370 Image Processing

I wish that all those people on that flight were with us, and maybe they still are, as I like to think they are on an island somewhere waiting to us to find them ... however, it does not look good... ...
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0answers
47 views

motion detection within a poor contrast image

I have a C# desktop application. Its purpose is to detect motion changes between consecutive frames. Currently I am using the excellent Emgu wrapper to OpenCV. Now, I know this question may seem ...
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0answers
28 views

Dice Similarity coefficient for 3D image?

I am want to calculate Dice Similarity Coefficient (DSC) for 3D image. I done it for 2D. But I don't know how to apply it or change for 3D. Could you help me to find the way to calculate DSC for 3D ...
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0answers
50 views

GLOBAL THRESHOLDING using histogram

There is a recursive way of finding threshold in the image using histogram that are biomodal, and is as follows: An automated procedure for bimodal histograms : Select an initial estimate of T ...
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1answer
27 views

Active Contours

In the below link: Active Contour http://en.wikipedia.org/wiki/Active_contour_model Internal Energy of the snake is $$E_{internal}=\frac{(\alpha\,\!(s)\left | \mathbf{v}_s(s) \right \vert^2 + ...
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87 views

How do I plot color distribution of HSV image in matlab

I have a dataset of images representing human skin. How do I plot the skin color distribution in HSV color space and YCBCR color space. However, I'd like ignore the "value" or "brightness" in both ...
2
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1answer
31 views

Is there a way to evaluate block size when doing image processing or video processing

I am currently doing foreground segmentation in image sequences. A DCT 8 by 8 feature is extracted for each pixel. Now i want to explore dynamic block size for different scenes. Is there any rules ...
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65 views

Segmentation based on peak values

I have a 2D array/matrix (something like an image, but it's not an actual image) with values from 0 to X (in this case 180). and I have a 1D array/Vector that has the occurrence frequency of these ...
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1answer
45 views

oilspill extraction [closed]

I want to extract the oilspill affected areas in SAR images using thresholding, where the affected area appears as darker than surroundings. Here I am attaching the code, where I am able to extract ...
1
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0answers
24 views

What are the optimal features for text line and table row discrimination in a handwritten document image?

I have a handwritten document which contains graphics, tables, and text paragraphs. I know how to extract graphics from this document. Now I want to know how can I discriminate between text lines and ...
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3answers
112 views

What technique can I use to remove useless information from an image?

Is there any way to remove useless information (unimportant details) from an image? If, for example, we have a specific image, so this contains both useful and useless information. If this image can ...
2
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1answer
133 views

Barcode localization in difficult environments

I'm creating a program for localizing types of barcodes. (I know plenty exist, that's not the question :) ) I'm focusing for the time being on 1D barcodes. The difficulty I have is that the barcodes ...
2
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1answer
77 views

Convolution kernels for image filtering

As I understand it, in image processing, when it is desired to apply a filter of some sort to an 2D image, a kernel is applied to all the pixels of the 2D image in a process called convolution. ...
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39 views

Thresholding for Movement Classification

I have an application which creates a Gaussian model of the background based on consecutive frame difference and auto-generates a threshold for separating no-changes to movements. The application ...
2
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2answers
87 views

Segmenting wood chips in an image

I am trying to recognize the wood chips in the image shown below. The ultimate goal is to try and recognize the width and length of each wood chip. Currently, I am using an approach that involves ...
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2answers
89 views

Simple way to detect continuous lines

I have some images of a background, and of steam that I am subtracting to extract just the steam. Unfortunately, because the camera conditions are not perfect the differenced image is always a few ...
5
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2answers
77 views

detecting “deformed” lines

I have a project in which I have to recognize 2 lines in different "position", the lines are orthogonal but can be projected on different surfaces. I'm using opencv. I'm not asking for code, ...
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1answer
72 views

Segmentation step when using feature descriptors

In my final year project, we are using a SIFT feature descriptor to classify and recognize objects, but I have never come across segmentation in the process of image classification/categorization. ...
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55 views

Image watermarking in wavelet domain (data hiding in images)

I am working and researching on Image watermarking/steganography and I'm stuck at a point and want to know which technique is better in image processing for data hiding. Bit Plane Complexity ...
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1answer
60 views

Find horizontally and vertically aligned sets of points

I have the image below. This image contains sets of points that are aligned horizontally and vertically. How can i find these sets of points? based 1) on their alignment and 2) on the ** ...
2
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0answers
51 views

Segmenting connected hand-written digits

By using Python (numpy/sklearn/opencv) I'm trying to process images with hand-written digits, and after all my main problem turns to be connected digits. For example: If I crop the digits by hand I ...
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2answers
253 views

connected component labeling: equivalence table

I am trying to write a connected component labelling program, I have done the first part to create a label based on the neighbours. For simplicity I am using a 4-connectivity. I am using ...
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2answers
445 views

How to recognize hexagonal tiling in boardgame?

I would like to recognize the boundaries of a hexagonal tiling in a photograph, like in image below: It seems to me, that a standard approach at a square grid is to first detect corners (e.g. ...
6
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1answer
204 views

Jigsaw puzzle: isolating the pieces (separating “stuck” blobs)

I'm new to image processing, and I'm trying to get my feet wet. I have taken a picture of some jigsaw puzzle pieces and I want to isolate the pieces. I am using the Python SimpleCV library to do ...
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0answers
62 views

is there any method to detect the eyelids?

I want to detect the sclera part of the eye in UBIRIS database. For that I need to remove the iris and the remaining eyelids and eyelashes and skin area. I have removed the iris and as my next step I ...
3
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1answer
79 views

Garment Cropping from mannequin

I have two images – mannequin with and without garment. Please refer sample images below. Ignore the jewels, footwear on the mannequin, imagine the second mannequin has only dress. I want to ...
2
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3answers
73 views

segmenting region of interest (ROI) from background

I am dealing with images from biological slides and want to segment out the ROI (cells) from the background. I have tried k-means clustering, otsu thresholding, adaptive thresholding, edge detection ...
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1answer
29 views

Comparison of size of an entity in different images with different resolutions? [closed]

Can we compare the size of two objects appearing in different images with different resolutions?
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2answers
144 views

Detection periodic elements in image

I am working on a university project in which I need to find a periodic net element in an image. The net is a set of diagonal lines in a specific angle ( which I don't know in advance ) on a noisy ...
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64 views

How can I create polygon estimates of each body part/limb that is present in an image which always contains one person?

Background I am working to identify and isolate each human limb of a known person, in pose, in an image which is relatively noisy. It should also be noted that the image is a snapshot extracted from ...
2
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1answer
127 views

Smoothing “font characters” outlines in bitmap image

Adobe Acrobat has this as a feature called ClearScan. While doing OCR it allows image enhancement, by smoothing irregularities on font outlines. For example, this source: turns to this: Are ...
3
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1answer
116 views

How to approximate these fuzzy rectangle shapes in binary maps?

The following binary maps are the results of a measurement I've carried out. I'm looking for a quantifiable measure of the red areas. I could trace rectangles manually (the green rectangle on the ...
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0answers
180 views

State of the art in Cancer tumour detection using Digital image processing algorithms

I am trying to understand how image processing is applied for detection of cancer tumor using image processing. Towards this direction I am trying to get latest information i.e state of the art in ...
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1answer
85 views

Segmentation of microscopic images

This is a classical image segmentation problem: I need to make a visual measurement of particles. I've been using watershed, kmeans and mean shift but it doesn't work well on this image. Could you ...
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1answer
196 views

What are some easy to detect reference mark shapes and corresponding detection methods?

Question Details: There are a variety of image processing algorithms useful for detecting reference marks (contour tracing, FAST, MSER, Haar Feature-based Cascade Classifier, or even just Harris Edge ...
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0answers
38 views

Automatic MRI Segmenation of Heart over Dicom Image [duplicate]

I have a bunch of short axis MRI images of the heart(Left Ventricle), in dicom format. I want to do a Automatic segmentation of various structures in these images. Does anyone know of a program I ...
8
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1answer
481 views

Counting vechicles in an image

I have been trying to implement an algorithm for successfully counting cars in an image. I have tried implementing A Method for Vehicle Count in the Presence of Multiple-Vehicle Occlusions in Traffic ...
1
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1answer
36 views

Extract feature area from image

I have an image like the one above, and what I need to find are the red circled areas. They are caused by how the nerve layer is in the eye, and I have no idea what method to use to extract them. (I ...
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0answers
46 views

How to detection of the boundary of the left ventricle [closed]

How to detection of the boundary of the left ventricle from MR images, the crucial step is to determine the region of interest (ROI) or the center point (CP) of the left ventricle. I just want to ...
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1answer
37 views

Morphology algorithm how it work for left ventricles dicom image [closed]

After so much search on google i find out few things hope so that correct for detecting Left ventricles of hearth and draw the Region of Interest(ROI) on MR Modality . Can you give me please more ...
-1
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1answer
72 views

Multithresholding- OTSU method

I'm trying to segment a specific part in a gray-scale image and I want to achieve this by applying the OSTU algorithm, but after using this function: ...
0
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1answer
103 views

Basic Algorithm for Image Classification

I have been trying to implement image classification by extracting facial features. I tried starting with some already established methods like Multi Kernel Approach, using Independent Component ...
5
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1answer
101 views

Vehicle segmentation and tracking

I've been working on a project for some time, to detect and track vehicles in video captured from UAV's, currently I am using an SVM trained on bag-of-feature representations of local features ...
12
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1answer
253 views

Reconstructing Tree Limbs that are Occluded by Leaves

How would would one approximately reconstruct the branches in a photo of a tree, where portions of the branches are covered by leaves? I can extract the visible portions of the branches by ...