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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9 views

Sliding Windows, Global Image, Clustering and …?

Imagine that you have an algorithm that must detect some feature in an image. Right now, I know three "families" of search algorithms. Sliding Windows: You take a patch of some size (e.g. 15x15 ...
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1answer
41 views

Explain Shift property of DFT

Please check the link What effect does a delay in the time domain have in the frequency domain? Here it is said that if you delay your input signal by D samples, then each complex value in ...
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2answers
22 views

Implementing image chroma keying with FIR filter in MATLAB

Is there any way I can apply the concept of FIR filters in chroma key composition, where I will remove a green background to focus on a subject and replace a different image on the removed part, sort ...
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1answer
22 views

Stopping Viola Jones Face Detection early

I want to try to improve an image processing technique for finding faces in images. I want to stop the Viola Jones face detector before it finds all faces, and do histogram equalization and other ...
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2answers
26 views

What is a translation property in DFT

Hi someone please explain me the translation property of DFT. I am not able to understand it neither from Gonzalez nor from internet. I have done extensive study on this but not able to get it. Really ...
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2answers
41 views

Would the locations of SIFT features generally agree with features detected by Shi-Tomasi method?

I am having a comparison of different feature detection methods. So if we compare the SIFT (Scale-invariant feature transform) and Shi-Tomasi method, will their feature locations agree and why? Are ...
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2answers
30 views

image processing in matlab

We try to multiplication operation bw(black-white) image with rgb image in same image but it's class is not same(bw-> logical, rgb->uint8) so not complated successfully. How can do convert from ...
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0answers
7 views

Replacing existing coefficients with new coefficients in Wavelet Packet Decomposition [closed]

How can I replace existing coefficients with the new coefficients in Wavelet Packet Analysis in MATLAB?
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15 views

Stationary wavelet transfrom: diagonal detail response

I am using the PyWavelets library to take the stationary wavelet transform of some images. By looking at the documentation for the stationary wavelet transform, I notice that for each scale level it ...
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0answers
29 views

Removal of skull stripe from MR image

How to remove the skull stripe from an MR image and to get the csf part from the image clearly? ...
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1answer
28 views

Image correlation confidence measure

I am trying to calculate the disparity between stereo image pairs. I'm using what appears to be the standard approach of correlating between a window of pixels from one image and a sliding window ...
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1answer
73 views

Bicubic Interpolation

I'm trying to do bicubic interpolation on an 8*8 matrix(image) shown below. ...
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3answers
144 views

Discrete version of pillbox function

This is an image processing question. In 2-D Euclidean space a pillbox function, $f(x)$ is given by: $$f(x,y) = 1\text{ if } x^2 + y^2 < R, 0 \text{ otherwise } $$ $R$ is come constant. If I ...
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17 views

Bhattacharyya distance for image segmentation explanation

I have a question need some your suggestion. I spent 2 months to resolve that problem but the result is not so good. Hence, I would like ask you some thing about my implementation. My goal is that I ...
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0answers
21 views

Gabor filter bank spatial frequency parameters

I've been trying to learn about using Gabor filters to extract features from an image. There are some research papers that list their spatial frequency parameter in the form of x:y cycle per pixels in ...
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0answers
13 views

Using morphological operations for color images processing

Have you ever seen any articles about using morphological-like technique for denoising color images?
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1answer
28 views

Avoid saturated pixels in cross-correlation computation

I am doing template maching using Normalized Cross-Correlation for measuring similarity between template and image. However, some images from my dataset contain saturated pixels (overshoot) which ...
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0answers
27 views

Image Processing - Identifing/locating Random Solid Blocks of Colour

I am not overly familiar with image processing. I know a little about it from University, but I have not really done any for a while and I have found myself with a problem that requires it. What I ...
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0answers
16 views

Detecting inset images/videos from a video

I want to detect multiple rectangles in a video, each of which features a different content, but running simultaneously. This is typically seen during debates on news channels. For example, in the ...
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2answers
39 views

Algorithms for deformable image registration

I need to perform a deformable image registration (DIR) for delineation of the different brain parts on the brain MRI 3D image. I faced with a problem that there are a lot of different approaches for ...
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2answers
70 views

how can i get to know the frequency of a speech signal?

What is the actual meaning of frequency? what if the signal is aperiodic?? In general, we say that frequency means the repeatition of an event in unit time. But what about a speech signal? how can we ...
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21 views

Is pixel with resolution 100mX100m equal to four 50mX50m while covering same area?

I take an image with spatial resolution 100mX100m,I take the same image with spatial resolution 50mX50m then each pixel value in first image equal to some of four images when covering same area with ...
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15 views

Stegnography and cryptography

I am last year student working on the project: Separable reversible data hiding technique In encrypted image. What are the algorithms that we can apply on jpeg/png image for compression which ...
2
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1answer
75 views

O(1) peak segmentation algorithm in matlab?

I have an intensity image, similar to the image below. I would like to very quickly, segment this image, into separate peaks. Where each peak is labelled, and segmented. A notional segmentation of ...
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91 views

Extraction of veins from sclera image

I want to extract sclera blood vein feature: from the sclera image for human identification. Which process should I follow? I already used the Gabor filter with Gabor features and Gabor filter ...
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35 views

Gonzalez question solution

If I have the histogram of an input image as Gaussian probability density function of the form: $$P_r(r)=\dfrac{1}{\sqrt{2\pi}\sigma}e^{-\dfrac{(r-\mu)^2}{2\sigma^2}} $$ where: $\mu$ and $\sigma$ ...
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1answer
34 views

What is difference between Taylor series and Legendre polynomial?

As i know, taylor series is used for analysis f(x). So if i have many orders, i can approximate f(x). In this point of view, what is difference Legendre Polynomials?
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2answers
92 views

Calculation of sampling rate and its effect on an Image?

I know that for a given signal, the sampling frequency $F_s$ must be twice or more than maximum frequency of the signal $F_m$. It is easy to understand the concept for a 1D signal. But I don't know ...
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1answer
58 views

Does anyone know how and when and where used Legendre polynomial?

I'd like approach to Legendre polynomial. But i don't make concept with Legendre polynomial. So if you know where and when does L.P used and how L.P used, would you please let me know about this? To ...
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15 views

Excluding the scatter points from a feature

I have a set of data points which are supposed to settle on a locus and follow a pattern, but there are some scatter points in the main locus which their existence in the data can increase the ...
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1answer
54 views

Histogram Intersection with two different bin sizes?

I have two images: A and B. Image A is a screenshot of image B, the original image. While there is noise in image A, the original features are still distinguishable. Histogram intersection tells us ...
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1answer
38 views

Image Segmentation applications

I wanna experiment k-means clustering method on different kind of images, so I am trying to find different kind of images used in image segmentation such as MRI images.I want to gather some more ...
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2answers
54 views

Pose estimation of colored checkerboard cubes

I want to find the orientation of 2x2 checkerboard cubes, like these: That is to say, I want to recover their positions and rotations within the image relative to the camera. In my particular ...
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1answer
24 views

float image to integer type image

I have a multispectral satellite image and I would like to "transform" each of the image bands into one with integer values. For example to stretch? the image between 0 and 255. Not sure how to ...
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1answer
55 views

map two RGB images in Matlab

I wonder is there any algorithm or method that I can map two RGB images together in Matlab. I mean assume I have following images Is there any way I find what number I should multiply each ...
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42 views

Understanding a mathematical statement in image processing

I am reading a document on Image processing and couldn't analyze a statement in it. For any $k \in \Psi_s$, the family of values $\{u[\varphi(p+l)+k-l]:l \in \Psi_s \}$ is representative of the ...
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26 views

Interpolation methods for radar and acoustic imaging and potential pitfalls

A) What are the most common methods used to remap data for current generation imaging radars and acoustic sensors? B) What are some of the pitfalls in these methods? For example, in the past, at ...
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0answers
22 views

Find maxima in digital image. Aplications?

I see in a lot of software for digital image analysis (such as ImageJ or Fiji) the option to spot the local maxima of an image. I have been searching through the web for aplications of this but I cant ...
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1answer
70 views

Separate sub-figures!

Any idea on separating multi-panel figures? There are 2 different sub-figures connected each other. Thanks!
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2answers
49 views

2D-otsu algorithm in Digital image processing

I'm working on image project using Matlab & I heard about 2D-otsu algorithm as effective segmentation with low SNR and low contrast images, but I can't find enough information about it or how to ...
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1answer
127 views

How to detect whether the object has triangular shape?

The task is to detect arrow from medical images. After segmenting, arrow-like objects can be connected with other connected components (noise). In this context, detecting a part of the object that ...
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0answers
47 views

Ways to find three curves from palm image

I am asked to extract three curves from palm images. original image expected result. The curves has lower intensity than ...
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2answers
75 views

Template matching or object recognition?

Problem: I have a photo of an object (a manufactured part like the attached photo below), using my Andoird phone camera I want to verify if the object in camera preview matches to the template or not. ...
4
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1answer
80 views

The small red peak in the CIE standard observer

The human eye has 3 types of color cones: red, green and blue. Their spectral sensitivity peaks in short (S, 420–440 nm), middle (M, 530–540 nm), and long (L, 560–580 nm) wavelengths. See diagram ...
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23 views

segmentation: how can I improve it?

I have written code which identifies the direction of arrow .I have used split and merge technique for segmentation ,It is sometimes stupid and I know that it is because of my predicate function which ...
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0answers
41 views

Feature selection of Gabor filter

I am working with Gabor filter with level set method here. As you known, gabor filter gave many filter output. Some of them is not necessary. Could you suggest to me some method that can choose best ...
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0answers
19 views

Problem in openCV casade classifier

I am trying to train cascade classifier using "opencv_traincascade" utility. I'm having 100 positive images and 500 negative images. I have created .vec file using following command: ...
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1answer
68 views

What's the state-of-the-art algorithms in image edge detection?

There are several state-of-the-art algorithms in image denoising including Non-Local Means, BM3D and so on. I am wondering whether there is some well-known state-of-the-art algorithms in image edge ...
2
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3answers
71 views

How to filter noise from continuous path in image

Problem statement In the dataset above, you can notice a continuous path and then a noise-band at around 320-400 on the x-axis. I want to be able to apply a filter that amplifies the continuous ...
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0answers
24 views

Best method for texture classfication

I am working in medical and nature images processing . I want to find a popular method to segment texture image. Could you suggest a popular method to do it? For example: Gabor filter, tensor...