Questions tagged [image-processing]

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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8
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2answers
306 views

How to measure the quality (or difference in quality) of different images?

I would like to measure the quality of a color image, possibly as a difference to another image, but if possible, on its own too. This question comes from the fact that we have a vision application, ...
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I'm looking to do my senior capstone project in the field of medical tomography, what is a good book to get acquainted with the field?

I'm a junior currently pursuing a mathematics degree with aspirations toward medical school. I have a senior project I have my entire last year to devote time to, and I've decided that I want to ...
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1answer
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Erosion and dilation in images

I don't know if I am posting in the correct place. I wanted to ask about dilation and erosion in bitmaps. I have as a homework to implement in a programming language these morphological operations but ...
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Good language for computer vision?

I am trying to implement a content based image retrieval system but before I do so I would like to get an overview of some programming languages suitable for this task (having good libs and such). ...
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How can I detect buttons in a GUI of an app with pattern detection using python?

I will explain taking as example the GUI of the Calculator app in windows. Given this Calculator application open and focused, I need to find a way of detecting all the buttons.I can only use non-...
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1answer
908 views

one to many images matching in matlab?

i have database for 50 person ,it is 250 images (5 images/person) , i need to perform one to many matching between images for recognition persons. so , i divided the image as 2 parts (one for ...
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4answers
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Image Recognition

Looking for an open-source system that allows commercial use to do image recognition on a massive and organically growing collection of 2-D images where the only known variations will be: Scaling ...
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1answer
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List of all available ARM+DSP processors for surveillance

I have come across TI's C6000/Integra. I want to know is there any other similar or better ARM+DSPs available. Specially for surveillance/vehicle number plate recognition etc. Having camera input at ...
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2answers
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how can i perform a registration to 2D images using ''rigid " transformation in matlab?

i need to perform registration to 2D image using"rigid transformation" in matlab .i need this for measuring the similarity between my images .any one know how this can be done using matlab? an ...
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List of possible image features for content based image retrieval

I am trying to find a list of possible image features like color, oriented edges and so on for measuring their usability in case of finding same/similar objects in images. Does anyone know such a list ...
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1answer
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is it possible to matching b / w images without feature extraction steps? if possible which algorithm may be more suitable?

these are example of my image i have a 245 images similar to it ,i obtained these b/w images after preprocessing stage , i want to use them for recognition persons(not verification) in matlab. can i ...
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2answers
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How can I identify Arabic letters in an image using Java?

I want to identify Egyptian car number plates that look like this: How can I do this in Java ? I plan to do this in Android, as the user will catch the number plate with a camera and the results ...
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1answer
236 views

How to outline a defect in an image?

The images given below are a result of fruit defect detection algorithm i have made myself... Just wanted to know is there a way of outlining these defects? Original image 1: 1st Image: Original ...
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1answer
364 views

Determining the resulting pixel value before creating a compressed JPEG image

Is it possible to determine the resulting pixel values and modify them before the compressed jpeg image is actually created? For example, I'm at the stage where I already have the quantized DCT ...
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1answer
723 views

How do you choose the optimal number of taps in a windowed image scaling filter?

I'm attempting to use a filter to scale an image and for the most part, I have something that appears to work. But now I want to be able to generate a filter with an optimal number of taps. I know ...
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3answers
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How to Remove Gaussian Noise from an Image without Destroying the Edges?

What is the best filter for removing Gaussian noise without destroying the edges? I am using the standard Lena images with additive Gaussian noise and I want to denoise before applying anisotropic ...
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1answer
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How do I remove all white pixels in a modified image which are not present in the original?

I have the following image and after thresholding it, I obtained this result: How can I remove all white pixels which do not belong to the original image? The desired output should look like this (...
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2answers
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how to extract features from this image ? what are the suitable features to be selected?

I have this image: After many preprocessing operations, I obtained this image my goal is implementing one to many matching on my images for recognition purpose,i have 250 image for 50 persons (5 ...
3
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1answer
303 views

Contours chains matching techniques

I have chain contours representation: - classic Freeman chain - angle chain with distance (first: angle between neighbor points, second: distance between them) What are the best techniques to ...
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0answers
203 views

Blurring in anisotropic outputs

I am trying to produce ideal anisotropic diffusion outputs using the standard lena image. Using the first coefficient , the output is coming somewhat close to ideal ouput but when I increase the kappa ...
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4answers
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How to extract traffic signs from a photograph?

What image analysis techniques can I use to extract the traffic signs from an image such as the one below? Edit: After Anisotropic diffusion: The background that i don't want gets cleared a little ...
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2answers
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Image Processing - What Is a Gradient Domain?

What is the gradient domain? Does it relate to the Laplace Pyramids? I found only articles assuming you know what it is and not define it, can someone please define what is it and what it is used for?...
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What are some free alternatives to SIFT/ SURF that can be used in commercial applications?

As far as I understand, both SURF and SIFT are patent protected. Are there any alternative methods that can be used in a commercial application freely? For more info on the patent check out: http://...
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1answer
216 views

Is it possible to simplify the convolution integral if the functions are non-zero in disjoint areas? [duplicate]

Possible Duplicate: When convolving two functions that are constants in a region and 0 everywhere else, where does the integration start? I have a function $f(x,y)$ and $h(x,y)$. $f(x,y)$ has a ...
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1answer
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Removing white pixels from a b/w image in MATLAB?

Consider this MATLAB code: mg=imread(........bmp'); level=graythresh(mg); x=im2bw(mg,level); figure,imshow(x); BW2 = bwperim(~x); figure,imshow(BW2); ...
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1answer
439 views

Non-orthogonal basis which offers better energy compaction in image compression

I am aware of image-independent basis, i.e. DCT, and image-dependent basis, i.e. Karhunen–Loève, which are used in compacting energies for image compression. These bases are orthorgonal. Are there ...
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Preprocessing to improve Harris corner tracking between video frames?

In our unmanned aerial vehicle grayscale video image stabilization application, we're having difficulty finding the "good" Harris corners in frame N+1 selected from frame N. The source of the ...
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3answers
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Simple, streaming, lossless image compression

Does anyone know of any image compression techniques with the following characteristics: lossless streaming - I want to compress on the fly, pixel-by-pixel. low-memory overhead - I can afford to ...
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1answer
357 views

Anti-aliased boolean masks for integration of CCD images

(This question was already asked on Stack Overflow under the tags Matlab/Octave/Signal-processing/Image-processing, but I am reposting it here following the advice of one user that this site may be a ...
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2answers
358 views

JPEG steganography

Aside from Jsteg of Derek Upham, Outguess of Neils Provos, and F5 (improvement of F3 and F4) of Pfitzmann and Westfeld, What other methods can you use in information hiding in JPEG images? The ...
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1answer
3k views

Java - Convert Image to Binary (Two Colours/Black & White)

Is it possible to convert a .jpg image to binary using Java? I have asked a similar question on StackOverflow but thought that maybe this may be a good place to ask, too. I am currently able to ...
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3answers
986 views

Face Recognition / Image Processing

For a Face Recognition system which one is better using Neural Network or the Histogram with pattern matching concept ?? which one is more accurate?? I need to integrate the face recognition engine ...
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5answers
32k views

How to remove the glare and brightness in an image (Image preprocessing)?

I have an image Is there any way of removing the bright white spots ? Please help thanks Edit: After operating with gaussian and then displaying using imagesc get the following output which ...
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1answer
635 views

Iris recognition using filters?

I am implementing an iris recognition system in matlab and have performed the following steps according to an algorithm proposed in a paper Initial image Median filtering For each row in the ...
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1answer
251 views

Are there any good “conceptual distances” for comparing two images?

I want to define some distances to use over an image, which I create. I think I need to define two different "distances". The first distance should be the most robustness preserving in compare to ...
2
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1answer
222 views

Identify rectangles of different colors

How identify the presence or absence of regular stripes of different colors, but ranging from very very very very light pink to black inside of a scanned image (bitmap 200x200dpi 24-bit). Carry a few ...
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1answer
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Detect and isolate veins in the palm?

I am trying to figure out a way to find out the vein pattern in the hand.. Please could someone suggest ways to do the same.? I know first i would need to find the ROI in the image and perform further ...
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4answers
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Do the DCT coefficients correspond to particular pixels?

Getting the DCT coefficient based on what I've read, is usually done through a matrix, usually 8x8 or 16x16 using these formulas: $$B_{pq}=\alpha_p\alpha_q\sum_{m=0}^{M-1}\sum_{n=0}^{N-1}A_{mn}\cos\...
5
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1answer
216 views

How to amplify regions with specific color in an image?

I want to amplify regions with a specified color in an image. For this purpose I have defined a simple function $B(x,y)=s_r(x,y) \cdot w_r + s_g(x,y) \cdot w_g + s_b(x,y) \cdot w_b$ which produces a ...
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2answers
3k views

Open Source Implementation of 3D Thinning algorithm

I am looking for open source implementation of thinning algorithm in 3D. Thinning algorithm: Convert binary shapes to 1-pixel wide lines, without shortening it or breaking it apart. For example, ...
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2answers
330 views

main direction in 2D map of data

It may be a very simple question. We would appreciate any comments, guide or complete solution. We prefer however incomplete solutions but novel practical ideas. - How to find the main direction of ...
8
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1answer
439 views

Extremely computationally intensive image/video compression schemes which offer better compression than industry standard JPEG/H.264

I am trying to search for image/video compression schemes which offer superior compression performance (holding image quality as constant) when compared to widely adopted industry standards (i.e. JPEG/...
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3answers
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How to remove certain background from image?

This was the image obtained after Gabor filtering... Is there some way of removing the lines inside the image except the bright white rounded defect. Did try another orientation of gabor filter go ...
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3answers
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Can Gabor filter be used for detecting dents in cars?

I am doing some research on Gabor filters for detecting dents in cars. I know Gabor filters have had widespread use for pattern recognition, fingerprint recognition, etc. I have an image. Using some ...
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1answer
149 views

What transformations have been applied to this image to yield four derivatives?

In a few days I have an exam of image processing. I'm currently having a look at the example exam and I came across this question. "Which transformation of this image is being done here. Explain the ...
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1answer
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How to compute 2D displacement vector for binary image registration?

My inputs are several binary images like: They have globally the same content but may be unregistered as they are produced from a hand camera. What I would like to compute is the 2D displacement ...
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2answers
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What are the differences between these two Gabor filter functions

I need to enhance the visibility of veins on dorsal hand vein images in my project. I use two different even-symmetric Gabor filters bank improve vein visibility. First bank consists of these gabor ...
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1answer
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FFT of image data: “mirroring” to avoid boundary effects

I load and display an image of some rice in Matlab: g = imread('rice.png'); imshow(g); I take the FFT of this image and shift it: ...
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1answer
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Detecting a fixed template image out of a semi-constant frame of video

There are a number of videos that I'm looking to process of different video games to detect various "states" in them. The first game that I am tackling is any edition of Super Street Fighter 4. In ...
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4answers
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Is this a correct method for fixed pattern noise correction?

I am currently involved in a project involving programming an imaging sensor. Our sensor is giving us noise, so we want to correct for it. Someone else on the project came up with the idea to take a "...