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 to match a thumbnail to an area in the original image?

Suppose that you have a thumbnail and the original image from which it was generated. You need to match the thumbnail to an area in the original image that represents the original selection from which ...
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4 views

How can I use a trained model to generate related images?

Suppose I have a data set of a large number of related images and I extract HOG features and train it using SVM Classifier or KNN Classifier. How can I use this model to generate a new image which is ...
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10 views

Image rotation - bilinear interpolation method

I am trying to rotate an image but I am getting unsuccessful results. I realise I can just use rotate functions in packages but I am trying to do this in a particular way so I can understand what is ...
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1answer
18 views

Transform matrix creation in compressed sensing

In Compressed sensing ECG reconstruction I would like to use bi orthogonal wavelet basis as transform/sparsifying domain. I found out that ' wfilters ' command in matlab will give 4 type of filters, ...
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1answer
14 views

difference between wavelet filters

Some may think this question is little primarily,I just want to know the differences between different wavelet filters like decomposition high pass,low pass,reconstruction high pass,low pass ...
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9 views

extraction of image using tikhonov regularization in matlab [on hold]

i have created inverse problem y=Hx where H has toeplitz structure of dimension 2976X2976 and y contains information about image(some raw data for a each pixel). i implement this using Orthogonal ...
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8 views

How can I improvise matlab code from GLCM to CLCM(Color Level Co occurrence Matrix) for feature extraction in texture analysis?

Currently I am doing my project on SKIN DISEASE DIAGNOSIS USING TEXTURE ANALYSIS in IMAGE PROCESSING domain.In this project,the histopathological image of diseased skin image is given as input and the ...
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11 views

Laser Pointer Detection

In my project I want to develop a robust Algorithm to detect laser pointer in the projected screen and my algorithm want to find it's X,Y co-ordinate.Can anyone suggest some algorithms to find laser ...
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13 views

OpenCV Hough Circles Returning Too Many Circles: Access Violation when trying to access members [on hold]

I am trying to detect a circle in an image using OpenCV HoughCircles in C++. I am new to OpenCV, but I managed to get the image to black and white, applied threshold on it and burred it. The problem ...
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17 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
22 views

NORM_HAMMING2 vs NORM_HAMMING

I'm trying to use ORB features with a cv::BFMatcher. ORB is based on binary descriptors so HAMMING must be the choice, but I'm not sure I understand the difference ...
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26 views

How to add single wavelength discrimination to the Kutulakos & O'Toole paper on a generalized Light Transport Matrix system

I wish to add single wavelength discrimination to the excellent paper Transport-Aware Imaging, Proceedings of SPIE Vol 9376, 937606 @ 2015 SPIE ,authored by Professor Kiriakos Kutulakos and Ph.D ...
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16 views

Detect quasi-parallel lines with spurs in a binary image

I'm looking for a way to remove quasi-parallel curves from the net, as depicted in the figure. Not only the original nets (upper row in figure) contain many spurs, but also the curves to be detected ...
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0answers
18 views

Brightness Estimation [closed]

I have tried to detect a laser pointer during presentation using projector.For that I have to capture an image using camera which was placed above the projector.That image may be affected by ...
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0answers
11 views

Approximate message passing coding [closed]

Anybody help me to get the codings for "Compressive imaging via approximate message passing with image denoising"
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30 views

I need to deconvolve the image of a fluorescent bead without the Point Spread Function in MATLAB

I am aware that I could use deconvolution algorithms such as LUCY, Weiner and Blind but I am confused as to how to estimate the PSF (point spread function), which is needed for the LUCY and Weiner ...
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0answers
9 views

What technique should I use to provide image data into LPP algorithm

I am trying to find a way how to input images into LPP. LPP, Locality Preserving Projection is a linear dimensional reduction technique which is capable of solving a variation problem. I need to ...
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1answer
38 views

Extract repeating structure from an image

I want to find repeating structures from the image .But I have no idea how to do it.Please help me.Actually i want to find how many lines and oval shapes look like similar and mark these by separate ...
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2answers
48 views

Which one is good Image processing language? [closed]

For my academic project, I need to process image to get pixel color and also needs to change the pixel color.I need pattern recognition. It is a web application. All I am trying is to capture the ...
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24 views

Gaussian signal / image smoothing at sigma 0.5

I am currently reading up on Lowe's paper [1] on SIFT keypoint detection. On the page labeled 97 he mentions We assume that the original image has a blur of at ...
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29 views

How to fix a defocussed (?) scanner image?

In order to examine printed circuit boards, I'd like to scan them with my flatbed scanner. However, as some components lift the board from the surface, I think the resulting image is not focussed ...
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1answer
15 views

Algorithm to effectively find perspective transform in motion estimation

I've shot a series of photographs in a sort of stop-motion fashion, and although the camera was mounted on a tripod, there are tiny motions between each two successive photos. After some ...
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1answer
36 views

How to ensure anti-aliasing in image resampling at lower resolution?

Suppose I have a 1D image with intensities $f_i$, $i=[0,n-1]$, where $n$ is the number of pixels. I want to downsample it to have $\frac{n}{2}$ pixels (let $n$ be an even number). For each new point I ...
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15 views

How do image recognition algorithms exploit redundancy amongst a set of sample training images?

In the process of training an image recognition software to learn to identify a particular object, we show it a set of images. These images, if they are of similar objects, will have some kind of ...
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22 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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1answer
31 views

Low Pass Filter - pixel correlation

I am trying to understand low pass filters for image processing, I came across an article that stated that low pass filters effect noise more than the real data due to that the image Noise always ...
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1answer
22 views

Algorithm to extract polygones with holes

I have this picture and would like to extract the bones. First I thought of contour-Tracking, but as you can see in some bones there are holes (Like for example at the left finger, in the bone in the ...
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26 views

how to write the mathematical equation for the concatenation of RGB channels into one image

I have the following RGB channels for a given image (x): R=x(:,:,1); G=x(:,:,2); B=x(:,:,3); I concatenated them using the ...
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14 views

SISO model? white noise excitation

I'm now trying to do this problem. I have data set including input and output for both 600 gal and 800 gal, and 3 white noise excitations. But i don't understand the model of this problem. 3 White ...
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2answers
66 views

What is the state-of-the-art of using signal-processing for “cleaning-up” videos?

TWO PART QUESTION - We've all seen the movies/TV shows where the police/feds/spies use computer software to take a grainy photo and do a "clean-up" to see a better picture and more details. I assume ...
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1answer
41 views

Python - Normalized cross-correlation to measure similarites in 2 images

I'm trying to measure per-pixel similarities in two images (same array shape and type) using Python. In many scientific papers (like this one), normalized cross-correlation is used. Here's an image ...
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11 views

what doest “hit or miss” in morphology do?

i searched for hit or miss in internet and gonzalez book but there is just a formula and example, and in that example the hit or miss just finds a pixel and no more ansers. i want to know by concept ...
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25 views

Vein extraction from this image

I have this image: What methods should I use to extract the veins from this image. Thank you.
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26 views

How to convert lut to 3d lut?

I have a lookup texture below which i got from some website(seems to be 8x8 2d LUT). I want to apply this LUT on a video.  Final cut pro/adobe premiere supports 3d LUT but I dont know to recreate ...
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20 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
63 views

Optimized 2D wavelet transform using FFT

I'm currenty aiming to optimize my fast wavelet transform (FWT) algorithm for 2D signals (images). It works as follows: one iteration of 1D FWT does convolution of 1D input data with a selected 1D ...
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1answer
44 views

what is happening when i run this code line? [closed]

I have the following MATLAB code: x=[1 2 3; 4 5 6; 7 8 9;]; u=(0:255)/(255-1).^1.05; x2=u(x+1) when I run this code I get the following as a result in ...
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0answers
17 views

Video stabilizer assessment. Estimate point spread function PSF

My goal is estimate PSF about image quality assessment of a video stabilizer c++ code from original shaked to stabilized image. I have read this abstract as road map but some point appears cumbersome ...
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23 views

Binary Orthogonal Sequences

The set shown below is a biorthogonal signal set. $\{|0000|,|0101|,|0011|,|0110|,|1111|,|1010|,|1100|,|1001| \}$ Any two codewords or signals can be checked for orthogonality using the equation ...
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2answers
40 views

What are characteristics of different MR images?

MR tools are used in many sectors such as medicine and mining. MR stands for magnetic resonance and MRI for magnetic resonance imaging. What are characteristics of different MR images? What are ...
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33 views

what does FFT low frequency refer to?

I have applied the fft for image (fluorescence microscope image) and I have got this plot. My question here, what the meaning of that? What and how can I explain this plot?
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1answer
31 views

what should be the min number of samples and sampling frequency while playing sound

As i am using open Al library for generating a tune. I was able to generate a tone for single frequency. When I was trying to generate tone for multiple frequncies, it suffered from the problem of ...
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1answer
34 views

Which softwares can process 2D Lookup table?

I have a look up table like this... I would like to know which video and image editors can process 2D LUTs.
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2answers
69 views

Why is it easier to extract color in HSV model than in RGB?

I am following the open-cv tutorial and they claim that: In HSV, it is more easier to represent a color than RGB color-space. after which they convert the image from BGR color model to HSV, ...
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15 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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2answers
44 views

what is a Gaussian signal?

I am learning Wiener filtering for 2D images by myself. From one book, it reads It should be noted that the study of the more general problem of signal denoising dates back to at least Norbert Wiener ...
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2answers
31 views

how can we tell that OTSU binarization is feasible or not.

OTSU is a very popular image binarization method, and Matlab provides a function to implement this method, see graythresh for details. In this function, it has two outputs, one is the threshold ...
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1answer
29 views

How to simulate hyper-spectral images

Hyper-spectral images are images with many bands (>=100) while the normal color images have only three bands (r,g,b). It is not difficult to simulate an artificial gray-scale image with the following ...
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1answer
31 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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1answer
34 views

Pyramid vs Scale-space in Focus Stacking

I'm working on a focus stacking program, I wrote one a few years ago which used a very simple method, basically taking a DoG approach, but only operating on the single full resolution image. The ...