Questions tagged [image-processing]
The image-processing tag has no usage guidance.
272
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What is a visual bag of words and how is it implemented?
I'm currently working on implementing a bag of visual words in Python. I get the general gist of how it works but I can't seem to find any sources that explain it in more detail to a level where I can ...
D.W.♦
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Meaning of topological distance between 2 pixels
I came across the notion of topology and topological distance in the context of image processing several times (especially when it came to mathematical morphology). I looked for a not too abstract ...
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Belief Propagation in Computer Vision
I am working on dense matching using DSP algorithm.
They have used belief propagation to optimize their energy function?
How do we do it?
I mean how do we assign prior belief?
Link: Deformable Spatial ...
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Reconstruction of drawing sequence from video
I have a video that record the drawing sequence with a pencil by a painter.
I want to reconstruction the sequence from the video.
And I have google some keywords like "drawing sequence reconstruction"...
D.W.♦
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Inverting radial distortion
I'm trying to understand the math behind correcting a radial distortion (caused by a lens), but I'm failing to have it explained in simple terms.
I found several examples that proceed this way: a ...
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Branch clustering for an MST
I am working in image segmentation with super pixels. My data is a large matrix describing various attributes of each stick of pixels (such as height, width and disparity). The data comes from an ...
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how to binarize an image?
I don't want to binarize a certain image through another program, I want to know how to binarize things myself. All I know is that there is something to do with a threshold and if it is above the ...
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Fill in objects that pop out from background?
I need some help with a program that will fill in objects that pop out from the background. For example I have this picture and would like to get an output like this. I don't know how to do this ...
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Are there any articles or software which can infer original shapes from overlapping shapes?
Given that some shapes overlap in an image, are there any papers or articles or code which can infer the original shapes from the overlapping?
I am thinking to apply some machine learning to this ...
D.W.♦
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Learning Image Processing/Computer Vision
What do I need to learn dense correspondence?
I am a newbie in Image processing/CV.
Please help me by suggesting a kind of syllabus or show me a way to learn about Dense Matching. What are the things ...
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How to train a Conditional Random Field/Markov Random Field Model for Object Classification in images given the features?
I want to classify superpixels in a image using a Markov Random Field/ Conditional Random Field model but have found no place that can help me with this (references don't even show how the network is ...
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Image Comparison tuned to Human Perception
Say I have two systems that take the same drawing commands and starts drawing on their respective platforms (i.e. HTML Canvas). After this is done, I want to save and compare these two images to ...
D.W.♦
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Intrinsic matrices in stereo camera calibration
Suppose I have two cameras, c1 and c2, observing the same scene. I can now
Calibrate each camera independently (e.g., with MATLAB's Camera Calibration App)
Calibrate both cameras simultaneously (e.g.,...
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Looking for Methods in Computer Vision for Distinguishing Disappearing and Fading Objects
Suppose I have a video in which there are two objects $A$ and $B$. Object $A$ appears suddenly at time $Ta1$, and then disappears suddenly at time $Ta2$. Object $B$ appears suddenly at time $Tb1$, and ...
CommunityBot
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Register images containing objects with varying distance to the cameras
I'm learning about using image registration to align two images, e.g., two photographs of the same scene taken from a slightly different location. What factors influence how well we can align the ...
D.W.♦
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How to select a good window size in the Running Gaussian Average method for Selective Background Updating?
I have been studying the Selective Background Updating in Running Gaussian Average Method, as discussed in the Wikipedia (the Variant method). The details of the algorithm, as I understand, is as ...
CommunityBot
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Clustering a set of images using keypoint descriptors
I'm trying to cluster around 16000 images into ~200 clusters, using kmeans with metric as euclidean distance or cosine distance. I understand that i need to extract keypoint descriptors to compute ...
CommunityBot
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1
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Viewing images that compressed using lossless algorithms
I am just trying to understand a few minor details regarding images that are compressed with lossless algorithms such as RLE.
If a bmp image is compressed using RLE, when does the decompression ...
D.W.♦
- 159k
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1
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Selective Background Updating in Running Gaussian Average Method for Background Subtraction
I am studying the Running Gaussian Average Method for background subtraction. One alternative, as described in Wikipedia, also known as Selective Background Updating, is to only update the ...
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Multi object image segmentation methods
I want to survey the state-of-the-art in image segmentation. Is there a paper on how to segment multiple objects in an image? The segmentation papers I read, normally identify one of the many objects ...
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Why does a color video compress better than a black and white video?
It was asked in an exam why a color video compress better than a black and white (grayscale) video using MPEG but can't find anything explaining it.
In other words, we would apparently get a better ...
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Why does taking a gamma value > 1 make the image darker?
If I've understood gamma correction correctly (and I probably haven't), a gamma transform to an image raises the value of the intensity level of the input pixel to the power of gamma, where gamma can ...
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165
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Fundamental and essential matrices, value of intrinsic parameters
I observe a scene with two cameras, c1 and c2, that produce two images i1 and i2, respectively. What I ultimately want to do is to use information of image i1 and image2 simultaneously, e.g., for ...
D.W.♦
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Getting the essential from the fundamental matrix
Is it possible to get E from F? I suppose that can't work, because then I could calculate the the extrinsic (and maybe also intrinsic?) parameters of the cameras without a calibration object of known ...
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Bringing images into alignment
I observe a scene with two cameras, c1 and c2, that produce two images i1 and i2, respectively. What I now want is to bring i1 and i2 into alignment, that is I want to know where pixel (x,y) in i1 is ...
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What is the reason of using Gaussian model for Background Modeling?
I am a new learner to Background Subtraction (Background Modeling) and I am reading a few previous works on how it is performed. Starting with Wikipedia (by searching "Background Subtraction"), I ...
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338
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Time complexity of a vertical sweep algorithm with histogram computations
In the paper
Quick Detection of Brain Tumors and Edemas: A Bounding Box Method
Using Symmetry, Saha et al
the authors claim that the running time of the algorithm (Matlab implementation) is $O(h)$. ...
CommunityBot
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1
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How to test image segmentation algorithms? [closed]
What would be an ideal environment/manner to judge the effectiveness of multiple segmentation algorithms? The goal is to determine which algorithms provide the best results for pre-clinical imaging. ...
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Making feature vector from Gabor filters for classification
My aim is to classify types of cars (Sedans,SUV,Hatchbacks) and earlier I was using corner features for classification but it didn't work out very well so now I am trying Gabor features.
code from ...
CommunityBot
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How do I detect and rotate a square?
I have recently written code for detecting path colors in a 2D grid and printing the corresponding path costs and it works fine for me.
Here's my code; I am currently new to OpenCV and know only C++ (...
D.W.♦
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How to identify and find navels from human pics
I have a specific question and not sure what tools I can use to finish my projects. I know this may has been well solved, but I am quite new to the image recognition and detection area and don't know ...
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Computer vision training procedures: SVM/AdaBoost vs Neural Networks
With SVM, adaboost or similar alogrithms, image training sets must be cropped with specific constraints (keep image cropping ratio the same, have object tightly cropped, same resolution)
In general, ...
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Can you determine rotation/camera calibration from series of images separated by pure rotation
I have a series of about 50 images, each separated by a small rotation and taken from the same camera. The images are feature-dense, and I can calculate a homography from image-to-image easily.
My ...
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What is the exact definition of a dictionary in the concept of linear algebra and computer science?
I am reading this paper for my master thesis and trying to understand every concept in it. The following sentence confuses me as to what is the exact definition of a dictionary in this concept except ...
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How to Know Whether a Topic is Publishable in Computer Science
Forgive my ignorance, but I am very new to the publishing process in Computer Science. I have some research that I have done involving analyzing data formats used in web-based image processing ...
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How can GIF compression be lossless if the maximum # of colors is 256?
I'm reading "Computer Science Made Simple" by V. Anton Spraul, and in the chapter about Graphics, he describes GIF files as follows:
A GIF file uses lossless compression to store an image with a ...
- 81.7k
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How to identify the z-ordering of objects in a computer vision or image processing scene?
Given that there is an image with objects in it, is there any method in computer vision to determine the z-ordering of objects. For an ideal image of three circles overlapping, I can determine that it ...
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Finding approximately collinear points
my issue comes from image processing. The image below is for a better understanding of the problem. I have to detect three dots (shown in black, marked with red arrows). The other points I get from my ...
D.W.♦
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Technique behind the way google earth overlaps polygons on top of pictures
What´s the technique behind the way google earth overlaps polygons on top of pictures(like the ones users assign to streets and houses) ?
It seems to be aware of perspective, and I don´t remember ...
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Simplify closed-path points without intruding into the inside of the path
I want to:
Simplify a set of points that outlines a closed opaque image on a transparent background.
The simplified set of points should not intrude into the closed opaque image.
I use a Marching ...
- 72.4k
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Improving MSE as fitness function for a genetic algorithm
I am implementing an autoencoder neural network in matlab, the weights of which are being optimised by a genetic algorithm.
At the moment I am working on the first layer, trying to get an improved ...
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How do I apply patch sized features to larger images?
I've been trying to teach myself some machine learning, and I wanted to ask what seems a simple question, but I've not been able to find any resources that explain the next step.
Let's say I am doing ...
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Selecting a M.S. in CS focus [closed]
I need to pick a focus in my Masters program.
The running candidates are
Networking
Bioinformatics
Data mining
Computer Image Recognition
In order to avoid this becoming a discussion, I'd be ...
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Training and testing image sizes for classification in computer vision
When training a classifier for object detection using features extracted from images (eg HoG features), how important is it that the images used for training fed into the classifier in their natural ...
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Method to recognize abstract objects such as hand-drawn objects?
My research is in the area of Document Image Analysis. To be specific, the topic of my thesis is to automatically recognize and index characters in a set of hand-drawn objects, e.g. given a volume of ...
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What are all the differences between the Gibbs phenomenon artefects and JPEG artefacts?
I thought the Gibbs phenomenom is the result of Fourier analysis estimation (but was it Fourier Series estimation or can it also be Fourier Transform estimation?)
JPEG uses the Discrete cosines ...
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Resizing and aliasing in computer science [closed]
If you resize an 1000x1000 raster image to 10x10 and resize it back to 1000x1000 is this considered to be an example of aliasing?
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Recognizing waterways in an aerial photo -- polygons from edge detection images
I am trying to recognize waterways from aerial photographs (say from Google Maps). Local governments often have GIS data that says where the waterways (and roads, buildings etc) are, but the water ...
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How to compute Gabor feature vector?
I'm working on semi automatic texture segmentation using level set and gabor feature vector described by Manjunath und Ma [1]. I consider their feature representation is better than others since I can ...
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Number of different output labels in Local Binary Pattern
I'm studying about Local Binary Pattern and I'm having trouble understanding the following part about the number of output labels for binary patterns from Computer Vision using Local Binary Patterns, ...
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