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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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
29 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
32 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
48 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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40 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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1answer
35 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. ...
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1answer
70 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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20 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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1answer
37 views

How to count and separate differnt objects from an image [on hold]

I am working on image segmentation and object classification. I want to separate different objects from an image and then use it for feature extraction. What method should I use to separate objects ...
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0answers
35 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
14 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
53 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 ...
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3answers
64 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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26 views

Given two 2D-imagex X and Y, how to determine how they similar are? [on hold]

Let $X$ and $Y$ be 2-dimensional images. What is some good metric $d(X,Y)$ for finding how similar the images are? In other words, I want to input for example two 512x512 images into $d$ and get a ...
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22 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...
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0answers
13 views

Extraction of a decision boundary (LDA) after a systematic querying of the feature space and convolution with Sobel filter (examples in numpy)

I am doing some experiments with LDA (Linear Discriminant Analysis), in python. Now I am at the point in which I would like to display the separation planes in the 3-dimensional feature space. I ...
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0answers
9 views

Scale Invariant Action Recognition from Human Silhouettes

For my project, I am considering a multi-camera setup for distributed action recognition for resistance against occlusion (under the assumption that the human figure is not occluded in all the cameras ...
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0answers
18 views

Extract notices from Newspaper

Here are my test image: and a result image: I used a simple thresholding, canny edge detection and contour method to get that region. However, some portions of the newspaper are being clipped. ...
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1answer
59 views

Low pass filter to maintain edge information

I am looking for a kernel acting as a low pass filter that satisfies these conditions: $$K(-\mathbf{u})=K(\mathbf{u}) \tag{1}$$ $$K(\mathbf{u}) \ge K(\mathbf{v}), \;\; \text{if} \;\; ...
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1answer
39 views

Comparison between average kernel and gaussian kernel?

In image processing, we have two kinds of major kernels that are average kernel and gaussian kernel. For image segmentation, which is difference between average kernel and gaussian kernel? I found ...
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7 views

Remeshing methods to obtain same number of vertices and faces in aligned meshes

I've a set of aligned meshes (human femura surfaces). I would need to remesh each of these surfaces so they have exactly the same number of vertices and triangles. I need this because I'm building a ...
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1answer
47 views

Real Time Object Tracking using image processing [closed]

How we can track a single selected object from multiple detected moving objects using single fixed camara?
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1answer
41 views

Make a movie from multiple images in MATLAB [closed]

I have 10 images in the folder say "D:\images\" named as frame1,frame2,...,frame10. I want to make a movie from the color images with frame rate as per choice.Also i want to save created video file in ...
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0answers
11 views

Tile (small image segment) clustering algorithm

I am the author of an open source program: Retro Graphics Toolkit you can find out more here https://github.com/ComputerNerd/Retro-Graphics-Toolkit Retro Graphics Toolkit targets older game consoles ...
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17 views

What is the implementation of a low-, mid- or high tone dodge or burn in the GIMP?

In The GIMP, and also in photoshop, you have the DODGE/BURN tool to enhance colors in shaded or highlighted regions, which would otherwise be blackish or whiteish. I found empirically that this filter ...
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1answer
45 views

How to detect a inhomogeneity region in image

I have an image that includes object and background. However, the object appears some inhomogeneity region due to illumination. My work is that how to detect inhomogeneity region. Which is feature can ...
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2answers
93 views

What's the underlying algorithm for detail-preserving upsampling in Photoshop CC?

The detail-preserving upsampling algorithm in Photoshop CC is truly amazing. It can upscale any image while preserving details in almost real-time. And I truly wonder how it is implemented. I've ...
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1answer
43 views

image 2-d real cepstrum with DFT ? ifftshift needed?

this is my testing image,it is taken from this paper: I tried to transform it into its real cepstrum domain with this simple matlab code: cepstrum_img=ifft2(log(1+abs(fft2(img(:,:,1))))); ...
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33 views

Visual regression test - Extract elements of GUI-Screenshot - MSER OpenCV

For a visual regression test I need to compare screenshots of webpages (different release-versions). I started with pixel by pixel compare. Actually I split the screenshot in different parts (maybe ...
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2answers
90 views

Draw outline of a text in an image

I need to draw an outline of text in an image. Consider the below image as an example. Can anyone suggest me a direction to achieve this? I don't have experience in image processing. Any tools/lib ...
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3answers
49 views

Camera Calibration using Single Input Image

Given a camera, permanently located at the same position, angle and distance from what is being captured, and a single calibration image ( a row of vertical lines [ | | | | ] ), how would one go about ...
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36 views

What is purpose of correlation kernel? IIs it high pass filter or low pass filter?

I am research about correlation kernel and I have some questions that need your help. Let see the pp. 3302-3303 in the paper: Changyang Li, et al., Robust Model for Segmenting Images With/Without ...
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44 views

Find and track deformable curve in noisy images

I need to find and track the location of the bottom of multiple deformable curves within a sequence of images. The images are taken roughly 5 seconds apart and there can be considerable deformation in ...
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0answers
72 views

Train a Cascade Object Detector in MATLAB

I am trying to train a cascade object detector in MATLAB using the built in functionality from the Computer Vision Toolbox. I’ve taken 500 photo’s of the sole of my shoe. Every photo is taken from ...
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2answers
42 views

As DCT does compaction of energy, can we say IDCT does energy spreading?

Like energy compaction transforms, the inverse transforms like IDCT are energy spreading transforms?
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2answers
92 views

Count objects in the image

How an algorithm can be developed to count numbers and bolts in the image below.
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2answers
45 views

What is 'energy compaction' in simple terms?

This is my understanding of 'energy compaction' and want to know if it is right. Take a vector. The energy of the vector is the sum of the squares of its elements. If A is the transformation matrix ...
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12 views

Ultrasound generation using field program II

I want to generate a synthetic Ultrasound image for the purpose of reference image for developing speckle noise reduction algorithms. I wanted to know how field program -II can be used with matlab ...
4
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2answers
201 views

Image Processing: Flatten a 3D Ball

There are many descriptions of how to turn a 2D image into a 3D one, however I want to do the opposite, in particular to a ball. As an example, consider the following ball: If only the (relatively) ...
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1answer
45 views

Using ROC curves for comparing the performance of SIFT and SURF

I want to compare the performance of SIFT and SURF against some standard image set. After a bit of research, I found that ROC curves are one of the best ways to do this task. In order to plot ROC ...
2
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1answer
88 views

What is correlation kernel and compare with gaussian kernel

I read a paper that said about correlation kernel that defined: $$W(x-y)=(α/1+d(|y − x|))$$ where $α = (\int(1+d(y − x)dy)^{-1}$, $(d(|y − x|))$ is spatial Euclidean distance from the central pixel. ...
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1answer
65 views

2D FFT of image and sharpness

I'm trying to make some simply autofocus algorithm for my device and pretty confused with 2D FFT results. As I know for now - number of high-frequency's components in 2D FFT will say me that image is ...
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46 views

Interpolation methods for radar and acoustic imaging

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 ...
0
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1answer
58 views

fast 2D cross correlation algorithm

I want to match a small template to a larger image, that the distance between the template and the subimage with the same size of the template is minimized. It can be solved directly or by applying 2D ...
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0answers
18 views

Fastest implementation of Features from Accelerated Segment Test (FAST) algorithm

I understand that there are different implementations (both in software and hardware) of the FAST algorithm. What is the fastest implementation of Features from Accelerated Segment test (FAST) ...
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1answer
27 views

Relationship between sensors and materials in terms of electromagnetic spectrum

The following text is from Digital Image Processing(Gonzalez and Woods)[3ed, Ch 2.2,p46] If a sensor can detect energy radiated by a band of electromagnetic spectrum, we can image events in that ...
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1answer
26 views

How to generate an image with certain clusters using K means clustering in CIE a*b domain?

I am working on building detection from aerial images using Image Processing in MATLAB. I am doing an image segmentation based on the local homogeneity of image. I want to apply K means clustering ...
1
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1answer
107 views

Zernike Moments' implementation in OpenCV

The reason why Hu moments were implemented in OpenCV and why Zernike moments were not implemented is looking like their performance similar as stated in this paper. As stated in the paper Zernike ...
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109 views

MPEG-7 descriptors' implementation in OpenCV

I'm looking for implementation of MPEG-7 descriptors which are compatible with OpenCV's recent versions and containing "region-based shape descriptor ART(Angular Radial Transformation)". I ...
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112 views

filtering out specific waves in scattering pattern

I have the following (experimental) image, with its correponding raw data in .csv format here. The pattern represents the scattering of a laser field off a point defect located in the center. One ...