In general, image processing is any form of signal processing for which the input is an image, such as a photograph or video frame.

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How modulation spectrum of zebra finch song is calculated

I read this advanced signal processing technique in Neuroscience Journel. Modulation spectrum is a spectral modulation vs temporal modulation plot. Please tell procedure of plotting it step by step. ...
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12 views

pre-processing to improve feature detector before tracking

I am trying to make tracking for soccer player, I need to detect features from this player and then estimate the distance difference of these pixels over number of frames. first I have to detect the ...
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9 views

How to calculate Coherent Change Detection?

I have two images which I wish to compare the difference between using coherent change detection and I'm having some trouble figuring out how to apply these signal processing equations to my data in a ...
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10 views

Eliminate frames with high reflection

I have online camera stream and want to eliminate frames with high reflection like this for example: The constraints are : Real-time no more than 2-3 mSec on Mobile Non-reference : the process ...
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1answer
29 views

Algorithm for color-balancing an image

I'm working on color-balancing images with as little input from the user of my app as possible, specifically to remove color casts caused by scanning aged paper. Photoshop's Auto Color action works ...
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4 views

what is in intuitive explanation of local derivative pattern (LDP)?

Zhang et al. proposed the LDPs for face recognition . They considered the LBP as the nondirectional first-order local pattern operator and extended it to higher orders ( th-order) called the LDP. is ...
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1answer
16 views

Result of a specfic plot

If we plot for example the relation between the probability of False Alarm (pfa) and the threshold. The threshold is in x-axix, while the $log _{10}(pfa)$ in y-axis. If I get for example the ...
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1answer
29 views

KLT tracker implementation

I'm working on a object tracker based on KLT algorithm using matlab. Can anybody guide me how I can find the features and calculate the distance in the sequence of the frames? Thanks.
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1answer
113 views

What do we espect Likelihood function used for?

In my understanding, I let make a example. For example, you can see in the following picture. Consequently, We want to find ^sigma. and We have already known the observation data(which is random ...
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11 views

classification objects in an static image using zeneric moments [on hold]

I want the details for programming Zeneric moments for classification of objects in an image. So can any one help to start up programing
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46 views

Why do we find the Maximum Likelihood Estimate on denoising?

Question1. To understand Maximum Likelihood concept in the denoising, I'm looking for matlab example. I can't quit a catch the concept. Especially about denoising. So would you please let me know ...
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1answer
20 views

Gaussian kernel - How is made?

How do i make a gaussian kernel.. I think i understand the principle of it weighting the center pixel as the means, and those around it according to the $\sigma$ but how would each value be if should ...
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10 views

What is the difference between harris matrix and the hessian matrix?

What is the difference between the harris detector, and the one used in surf the hessian matrix. They look the same so I am a bit confused at that point?
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DSP and Image Processing Beginner's book

Is there a book for beginner for DSP, signal processing with exercises, that also includes image processing ? It doesn't have to, but it would be nice, as most image processing books I founds assume ...
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18 views

Simple explanation for transform coefficient [closed]

Could anyone give a simple explanation for transform coefficients used in DCT?While studying about Image Processing I couldn't get the term transform coefficients.
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22 views

How to understand the mathematical notion of a image?

An analog image is a 2D function $$ f \in L^2 ([0, 1]^2 )$$ where the unit square $[0, 1]^2$ is the image domain. (Gabriel Peyré Advanced Signal, Image and Surface Processing, chapter 1) How to ...
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22 views

Satellite image quality assessment

I have satellite image and after I processed it, it became better than the original, how can I prove that it is better such that the psnr and mse give me low quality as it is different than the ...
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31 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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1answer
23 views

Embedded Image Processing System that sends photos to Smartphone via Bluetooth

I would like to create an embedded system that takes a Full HD photo by pressing a button,processes and compresses it(for ex. to jpg) and then sends it via Bluetooth to the smartphone - where it's ...
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1answer
95 views

Compare phase and magnitude spectrum results of 2 Images [duplicate]

I have read that from Fourier transform we obtain magnitude and phase spectrum. The magnitude spectrum tells you how strong are the harmonics in a image and the phase spectrum tells where this ...
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16 views

Completing an image edge using MATLAB

I'm trying to complete the right edge of the rectangle in the following image: The approach I've tried involves running a Sobel filter for edge detection on the image rotated by 45 degrees, ...
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1answer
21 views

how to add two images in one, next to each other

I have two splited images from diference matlab files. Now i need to merge them, near to each other. I tried supblot, imadd,cat methods, but nothing works. Please help me. rezult after sublot ...
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19 views

Need Help how to remove unwanted edge detection

Hye everyone. Really need help. How to remove the branch that i circle in the image. What parameters i should use. Really appreciate your help.
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1answer
33 views

Equalization and then Sharpening vs Sharpening and then Equalization

This was a question from an exam of digital image processing: "Working with low contrast images, an elective method to enhance details and improve contrast is to apply in cascade an equalization of ...
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14 views

How to preprocess fmri image with FSL?

I need to preprocess fMRI images with FSL (motion correction etc.). I never used FSL before and never done preprocessing. Is there a good tutorial which describes step by step how I can do the ...
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17 views

deriving chain code from the image

I am trying to learn how to derive chain code for following image as I have never encounter such kinda image before. I have to manually derive the chain code and then derive area out of it. Please ...
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1answer
37 views

Enhance image in matlab - exp operation - imageJ software-LPR

I use imageJ software, imageJ has a EXP command (process >math >exp ). original image: output image processed by EXP command in imageJ software: in this link explain how do that ImageJ: ...
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6 views

what is the drawback of DLBP(Dominant local binary pattern)?

Although the DLBP features encapsulate more textural information than the conventional LBP features, they lack the consideration of distant pixel interactions. The reason is that the binary patterns ...
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16 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
27 views

scanning an image for projected points

I'm projecting a series of points onto a surface and then recording their locations in the corresponding image. However, if one goes pixel by pixel a single point may, at times, take up multiple ...
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17 views

Class projects in Support Vector Machines (Image Processing)

Does anyone have links to a paper off of which a class project can be based? The project should essentially be an introduction to the use of support vector machines in image processing.
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1answer
24 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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49 views

Is MATLAB the best coding tool for Digital Image Processing? [duplicate]

I am a beginner. I do coding in Matlab only for image processing purpose. But my friends say it is very slow and in OpenCv I could get multiple times faster output results compared to Matlab.In basic ...
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18 views

How to get accurate line detection using Hough Transform?

I am currently working on my final year project for lane detection.My biggest problem now is that the Hough Transform method does not accurately detect the line.It just randomly detect line somewhere ...
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1answer
27 views

Balance brightness and contrast between two images

I have two different images for the same object. Each one was taken from different device (scanner, mobile camera, professional camera ..etc). the process of registeration one of them to the other ...
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22 views

maximum a posteriori background subtraction

I am reading Prince Computer Vision Models, Learning and Inference Book. In section 6.6.2, there is background subtraction method. In algorithms book, there is algorithm that is given below: ...
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1answer
10 views

Adaptive Sampling of Videos and Interpolation

I need to sample a video using adaptive sampling using MATLAB, sampling rate dependent upon rate of change of pixel values and then reconstruct the video using interpolation.I need to attach time ...
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19 views

What does visual clue means ?

Given a keypoint p detected in an image I . What does visual clueof the keypoint p mean ? ...
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23 views

Suggested books for Digital Image processing

Ok, I'm trying to get my concepts clear in this subject. Well, as per my course ware at college, the recommended books are "digital image processing- By Rafael gonzalez" and "fundamentals of image ...
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1answer
26 views

How does kernel work in unsharp masking?

I applied the kernel below to the picture for unsharp masking k = [-1 -1 -1; -1 8 -1; -1 -1 -1] I got ! Then I changed 8 to 14. And I got How does kernel work ...
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16 views

get convex hull of isolated shapes with openCV/C++

I have segmented CT images, something like the following one: I would like to get a convex hull that contains all the white regions. Something like this circle, but more fitting, and of course not ...
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47 views

Opinion about this aproach on Machine Learning

I have a question for you that maybe you could give me a clue. I'm trying to make a CBIR (Content-Based Image Retrieval), so I query an image and I get the most similar, not classified within a ...
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7 views

Canny QR code detection on Wood

I have been trying to use Canny to detect the 3 QR code markers on the following picture. But to no avail. (using the countour hierarchy method) I have tried so many different paramters, but I always ...
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1answer
48 views

How to estimate the noise of an image?

I want to know how to estimate the noise of an image? Also is this represent the camera's noise? Does anyone know how to estimate the noise of an image or camera? Update: Especially, I want to ...
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20 views

How to estimate noise level and actual intensity of image from a noisy image?

The image I have is corrupted with random (natural) noise. So I would call it Gaussian noise. I am thinking of the following approaches for denoising: Mean filter Non-local means filter Averaging ...
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15 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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1answer
43 views

How to make a plot of noise standard deviation sigma vs. brightness from a images?

Hi I don't know where to start from. I'm trying to implement a plot of noise with Matlab. I have found a plot of noise standard deviation sigma vs. brightness from a images like this. ...
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19 views

Large scale consecutive matrix multiplication applications

I am running some experiments with matrix multiplication and I am looking for applications (preferably signal processing applications) where multiple input matrices A(i), [i=0,1.....] are multiplied ...
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2answers
43 views

Has this 2D filter for enhancing circular dots in images a name?

I came across this 2D filter for enhancing circular dots in images, for example to enhance a dot with a diameter of 5 pixel, the filter is: $\frac{1}{336}\left( \begin{array}{ccccccc} 0 & 0 ...
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1answer
24 views

differences between 2D and 3D Medical Images

i have two questions: 1)what is the difference between 2D and 3D medical images? 2)assume i have a 2D image and for example it contains 1000 ROIs. each ROI is a matrix and we can convert it to a ...