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
Produce a 4:2:2 sub sampled Y matrix, Cr matrix, Cb matrix for an image
I have write the matlab code below for to extract Y, Cb, Cr information from the picture:
...
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1answer
19 views
Random selection of sub-block in an image with matlab
I want to select a random sub-block of 8x8 out of an image 256x256. Is there an instruction that do this thing or i need to calculate it with a different approach. I found how to choose a galois field ...
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1answer
29 views
Smoothing “font characters” outlines in bitmap image
Adobe Acrobat has this as a feature called ClearScan. While doing OCR it allows image enhancement, by smoothing irregularities on font outlines.
For example, this source:
turns to this:
Are ...
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1answer
30 views
Image processing functions for quality control
I have to use image processing for quality control of a cookie manufacturer (as a part of my project). The program must be able to detect oversized, undersized, distorted cookies, cookies having ...
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0answers
29 views
Want to Get Pixel Values from Mouse Pointer Location from the Mouse Click Event [closed]
I am trying to display dicom image over the picture box it works fine,
but Now When I click the mouse on the dicom image from that mouse pointer click event is fire,
I got x and y coordinate of that ...
2
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2answers
56 views
recover image by only magnitude of image fourier transform
I have a image and I want calculate fft2 of it, after it I want recover image only by magnitude of it. how can I achieve this work?
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2answers
95 views
Detecting a filled glass object
I've been sent here from this question in stackoverflow, please excuse me if the question comes too specific and it's not in the manners in here:)
The task is to find a glass with specific liquid in ...
4
votes
3answers
82 views
Can I control per-pixel contrast in an image?
Is there any way to control per-pixel contrast? E.g., a way to set an upper or lower limit on the contrast between pixels?
The closest thing I've found is a high-pass filter of an n-pixel radius, ...
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1answer
31 views
Getting Different Intensity Values in MATLAB and Java Program output
I am working in digital image processing field, i have set of mammogram images in .bmp format, when i am opening anyone image using MATLAB then i am getting intensity value as 0 for a particular ...
6
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0answers
152 views
Deblurring algorithm to precede thresholding - speed over accuracy
I'm writing an app that recognizes Sudoku puzzles from a camera input. I'd like to remove camera blur from the images to improve recognition. Here is an example image:
Since I'm processing a ...
2
votes
3answers
108 views
Calculating an image's fourier spectrum by hand?
Suppose I have a $4x4$ image with the following values as its grey-level intensity for each pixel like this:
I want to get its Fourier spectrum. Usually, I would just punch into Matlab and run a ...
3
votes
2answers
63 views
Centering zero frequency for Discrete Fourier Transform
I am working on a image processing application which uses a discrete fourier transform to implement blurring/sharpening. The application is more or less working, but something about the mechanics is ...
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0answers
10 views
Draw CAD SR Marker over Dicom Image
I refer various site for CADSR Marker to draw marker notation over MG Modality. on some sites i found the bunch of marker means more than one marker are draw at a point(Graphics Type Tag)
...
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0answers
47 views
Subtracting frame from video and write it again as video [closed]
I am capturing and saving frame from video. I want to subtract the current frame from previous frame and write it again as separate video. The program below is how I tried to implement this, but its ...
2
votes
1answer
68 views
Is it not possible to perform non-linear filtering in frequency domain?
This link contains the following statement:
In contrast to the frequency domain, it is possible to implement non-linear filters in the spatial domain. In this case, the summations in the ...
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0answers
18 views
how to display these polyline co-ordinate over dicom image
I get an Polyline co-ordinate from CADSR file(from Graphics Type Tag) I want to draw marker w.r.to that polyline co-ordinate on dicom file.
Polyline co-ordinate as ...
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0answers
25 views
State of the art in Cancer tumour detection using Digital image processing algorithms
I am trying to understand how image processing is applied for detection of cancer tumor using image processing. Towards this direction I am trying to get latest information i.e state of the art in ...
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1answer
69 views
How do I convert a filter from Spatial to Fourier domain?
I have a small 2D Gaussian image filter that I am currently applying as a window by convolution. I would like to do this in the Fourier domain as a single multiplication. I would like to convert my ...
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1answer
21 views
Image restoration using java
i am working in digital image restoration field, i am familiar with java and i want to use java in image restoration, can any please suggest me any book or tutorials where i can learn about image ...
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1answer
66 views
Why do we need to flip the kernel in 2D convolution?
Why do we need to flip the kernel in 2D convolution in the first place?
What's the benefit of this?
So, why can't we leave it unflipped? What kind of terrible thing can happen if you don't flip it?
...
8
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1answer
88 views
How do I calculate the color temperature of the light source illuminating an image?
How can I calculate the (black body equivalent) color temperature of the light source illuminating a given image? Below are screenshots of Adobe Lightroom manipulating color temperature and a shift in ...
1
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1answer
67 views
Image processing: using PCA for 3d object recognition
I read this lecture on using PCA/eigenfaces: http://www.cse.psu.edu/~rcollins/CSE486/lecture32.pdf
And I want to use this general procedure to recognize a 3D clay model that I took pictures of from ...
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1answer
35 views
How the Saturated Pixels violate the assumption that the image formation process in linear?
I am working in digital image restoration field and i have studied this is many research papers that presence of saturated pixels violates the assumption which is initially assumed by many blind ...
2
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0answers
59 views
Any Good Image Blind Deconvolution Algorithm for Removing Camera Shake
I am working in digital image restoration field, i have images that are degraded by camera shake.. can anyone please suggest me any better non blind deconvolution algorithm.
my images are similar to ...
3
votes
2answers
96 views
2D FFT of Vector
I have a bunch of 8x8 images which have been vectorized and formed into a 64xN matrix, X. I'd like to take the 2D-FFT of each of these images without reshaping each column of X into an 8x8 image and ...
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0answers
34 views
Finger print skeletonization without using matlab functions
I am trying to thin foreground pixels of a finger print until they are one pixel wide without using the built in bwmorph and thin operations.
Can anyone explain to me how to write them in matlab ...
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1answer
66 views
A book that focuses on optimization methods for image processing?
I am an image processing engineer. I my work I often find that there are many aspects for my code to be improved. Who can recommend a book which focuses on optimization methods for image processing? ...
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1answer
45 views
Which method should be selected to enhance the compressed image?
I have a raw infrared image with 16384(2^14) intensity levels.The raw image must be compressed into one with 256(2^8) intensity levels. In order to retain the original details( small blocks) , the ...
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1answer
39 views
What are reds and trans in Image processing
I'm trying to understand this code, however I'm unable to deduce the meaning of reds and trans. I would be glad if you can help with it:
...
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0answers
42 views
Digital Image Processing
I am trying to extract only urban aeas from satellite imagery Using Matlab. I have applied some edge detectors like canny and also used morphological functions and I am able to extract all the ...
3
votes
1answer
59 views
How to automatically detect blurred document images
The question I have is related to image quality evaluation. Suppose you are supposed to perform OCR (Optical Character Recognition) on a set of document images. Some images, however, are very ...
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0answers
32 views
Automatic MRI Segmenation of Heart over Dicom Image [duplicate]
I have a bunch of short axis MRI images of the heart(Left Ventricle), in dicom format.
I want to do a Automatic segmentation of various structures in these images.
Does anyone know of a program I ...
1
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0answers
34 views
Geometric models to discard image features
I am working on the implementation of a location recognition pipeline as detailed in the section 5.4 of the paper Leveraging 3D City Models for Rotation Invariant Place-of-Interest Recognition:
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6
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0answers
102 views
Counting vechicles in an image
I have been trying to implement an algorithm for successfully counting cars in an image. I have tried implementing A Method for Vehicle Count in the Presence of
Multiple-Vehicle Occlusions in Traffic ...
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2answers
69 views
Interpolation vs Interpolation Filter?
Hi guys, I've been reading some papers on - how to remove ghosting artefacts from the Fourier Slice theorem applied to a 3D discrete image volume. The papers mention that in order to remove ghosting ...
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0answers
41 views
How to detection of the boundary of the left ventricle
How to detection of the boundary of the left ventricle from MR images, the crucial step is to determine the region of interest (ROI) or the center point (CP) of the left ventricle.
I just want to ...
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votes
1answer
25 views
Morphology algorithm how it work for left ventricles dicom image
After so much search on google i find out few things hope so that correct for detecting Left ventricles of hearth and draw the Region of Interest(ROI) on MR Modality .
Can you give me please more ...
3
votes
1answer
37 views
Erosion in image
I don't if I am posting my question in the correct place. I have tried hard to solved it but I am unsuccessful.
I have an structuring element shown below:
...
5
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2answers
71 views
What is the difference between a simple gaussian filter and gaussian filter multiplied by its sum of it elements?
1 2 1 1 2 1
2 4 2 (A) (1/16) * 2 4 2 (B)
1 2 1 1 2 1
Both matrices are the same ...
2
votes
1answer
48 views
MR Segmentation to draw marker over the MR Dicom Images
I am doing R&D over the MR Segmentation to draw marker over the Heart MR Dicom Images. My Question is that how I can draw a such marker over the dicom image that show in attach/link image. that ...
3
votes
2answers
81 views
Question about harmonic calculations and other functionals for image analysis
I am implementing a method known as trace transform for image analysis. The algorithm extracts a lot of features of an image (in my case features pertained to texture) using a set of transforms on the ...
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3answers
75 views
Image processing, recognizing a small feature in a larger image
I am trying to write an image processing program to recognize bubbles in oil.
It has been suggested I try computing the convolution of the image and an image of a typical bubble.
i.e. : ...
2
votes
1answer
35 views
Image processing: how do I erode on boundary and dilate inside boundary?
I have an image that I am trying to process:
I want two seamingly contradictory effects:
I want to remove "holes" inside "the blob". That is I want all pixels inside the blob to be solid red.
I ...
3
votes
1answer
34 views
Logic behind unsharp filter in matlab
I am trying to understand the logic behind unsharp filter in matlab. If I type:
...
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0answers
15 views
Consider filtering n*n images by separable m*m filters.What are the computation time for filtering using FFT;2-D convolution;by two 1-D convolutions
Consider filtering square n*n images by square, separable m*m filters.
a) Give general equations for the computation time for the following approaches to this 1) filtering using FFT 2) by 2-D ...
1
vote
1answer
86 views
CUDA vs FPGA for Image Processing; which is better
Is there anyone with Image Processing background who can suggests which one is better for Image Processing algorithms among CUDA and FPGA. I'm specifically looking to write code for Wavelet Transform ...
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0answers
47 views
How to blend images on a spherical surface / cube map
I already have an algorithm for making panoramic image mosaics by image registration and then blending images in the overlap regions.
The following image from Wikipedia illustrates several images ...
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1answer
52 views
Basic Algorithm for Image Classification
I have been trying to implement image classification by extracting facial features. I tried starting with some already established methods like Multi Kernel Approach, using Independent Component ...
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1answer
50 views
Help in modelling medical data
I am practically new in statistical modelling so kindly bear with my questions.I have a data set of 3 dimensions that is there are three columns and 50 rows (50 observations).Each column represents ...
2
votes
1answer
51 views
MATLAB: Why my Pixel Indices are so different from that in Spatial Coordinates
The question is revised to make it more specific and constructive.
I am doing imtransform, yet the xdata and ydata are very much different from that of size(output).
[ output, xdata, ydata ] = ...
