What is Image processing: Definition and 79 Discussions
Digital image processing is the use of a digital computer to process digital images through an algorithm. As a subcategory or field of digital signal processing, digital image processing has many advantages over analog image processing. It allows a much wider range of algorithms to be applied to the input data and can avoid problems such as the build-up of noise and distortion during processing. Since images are defined over two dimensions (perhaps more) digital image processing may be modeled in the form of multidimensional systems. The generation and development of digital image processing are mainly affected by three factors: first, the development of computers; second, the development of mathematics (especially the creation and improvement of discrete mathematics theory); third, the demand for a wide range of applications in environment, agriculture, military, industry and medical science has increased.
Hey guys,
Im 2nd year undergrad majoring in Medical Physics and Imaging Tech.
This week we got a presentation from the graduates of my course and was told that the chance of getting into the field is very very small, specifically the hospital physicst and actually advised us to think of other...
I am trying to understand some really basics of image processing. One of them is the DFT ( Discrte Fourier Tranform). I have seen code segments, read stuff but still I don't get how the image produced is related to the first one. For example, I take an image with vertical black and white...
Hi,
I have an image (attached) I have to use as a reference.
To be clear I have to use this grid as calibration for an acquisition sistem.
I want to get the grid of this image and superimpose it on other images.
Is it possible? how to do it?
Thanks
Hiya! Long time registrant, have not used these forums is years though...
Anyhow, the problem I have is that I need to collect data from a very large number of images that are essentially horizontal lines on a page. I've attached a sample here, which has been processed to find the edges of...
hi!
i need help with problem:
Let F(u,v) be the Fourier transform of an M x N image f(x,y). Let g(x,y) be an image of dimensions (2 M) x (2 N) whose Fourier transform G(u,v) is defined as follows:
What does the image g(x,y) look like in terms of f(x,y)?
my solution ...
Hi,
I have a movie that contains a particle moving from one end of a channel to another end. The velocity of the particle is super-fast. I need to know how I can estimate the time and pictorially (like using a histogram--similar to plotting the heart pulses of a person) be able to tell when the...
Homework Statement
As per the attached picture, we are basically trying to find out the time interval between the instants that the particle (black dot) is in the first region of interest and the instant that it is in the second region of interest.
i have a video in which the particle in...
Help in MATLAB image processing ?
hello friends...i save my picture named "manish.tiff" in MATLAB directory...then opening this with command named rgb =imread('manish.tiff') in command window...but it shows error...
below is the error i m getting.
(? Error using ==> imread
File...
Okay, so my first essay was swallowed by some impromptu logging out, so I'll be shorter and sweeter this time.
I want to make a robot that accepts commands from a computer via USB. It will tell the robot basic commands like "next" and "back" with the bot figuring out what motors to move for...
Homework Statement
13.2 A quadratic Julia set has the form
z(n+1)=z(n)^2+c
The special case where c=-.123+.745i is called Douday's rabbit fractal. Follow example 13.1, and create an image using this value of c. For the Madelbrot image, we started with all z-values equal to 0...
Hi all,
I'm working on some image analysis as a part of my research, specifically trying to match images. The method I am using transforms the image into the frequency domain and then applies a band pass (or mesa) filter to eliminate noise and the dc component of the image.
I have never...
it might sound a bit hilarious.. some where i read about image processing where on the original image some operations were done (dealing with something related to convolution may be ) and say image A was obtained.. again another set of operations ( dealing with Fourier transform on the image...
Hello all,
I am taking a course on Digital Image Processing that starts in a week.
I do not know linear algebra very well and am concerned this will be a problem.
I understand the stuff that is taught at the beginning of a linear algebra course, which I guess is better called Matrix...
I need to take one more course for my EE Bachelors degree in one of three specialized areas: Signal Processing, Controls, or Communications.
I know all three of these are very much related, but I am finding Signal Processing by far the most fascinating field out of the three.
The problem is...
Hello!
So this is minimally image processing, but I didn't know what else to name this thread.
I'm working on a project and basically, I have this image (see attached file) that's provided to me. That's all I have to work with. The first column of colored pads represents my test pad...
Hi, I am a student whos trying to achieve some camera tracking and speed control of a trolley.
and I am kinda lost, don't know where to start with, hence urgently need experts advice.(supervisor couldn't help much)
Could someone please suggests me where to look at or any product that's...
Homework Statement
I(x) is the intensity of an image after passing through a material which
blurs each point according to a point spread function given by:
S\left(x'-x\right)=e^{-a\left|x'-x\right|}
The Fourier transform of I(x) is given by:
I(k) = \frac{A}{\left( a^{2}+k^{2}...
Given 2 image taken from 2 camera in canonical position, and the baseline is b, we can find the distance Z of an object from the camera. We know that
Z=bf/D where D is disparity.
I read some books but still have no idea of how to find the disparity using c#. Can someone suggest some...
Hello,
I m a computer science student and i m working on a project on MATLAB and currently I am stuck in a problem.The problem is that i want to
extract head from this image without using imcrop command meaning that it should automatically search and detect the head(keeping this as the...
I have to take an image with a narrow intensity histogram and widen its intensity range using a simple transfer function that scales the dominant histogram intensity range [I_min, I_max] to the range [0, 255].
They tell me to tuse a linear function that maps I_min to 0 and I_max to 255 and...
Homework Statement
image processing
I would like to rotate an m*n image matrix by any input degree, simplest cases 90, 180 and 270 on MATLAB without using any of the built in functions i.e. purely mathematical
Homework Equations
The Attempt at a Solution
\left[...
Hi, I'm in an astrophysics lab course - and the CCD image processing software on the physics department computers are .. frustrating to say the least.
I was wondering if anyone had any suggestions for something i could download and run on my mac; preferably free.
Thanks,
Hi,
I'm currently working on an imaging problem that oddly requires some physics. Basically, I'm given a set of gray scale pixels and I have to determine whether they're a fiber or just random noise. My question is, how do I calculate the moment of inertia of the pixels while considering...
OK, so this isn't anything I've ever done before and would like some input on feasibility, and whatever else you can throw at me.
I'm examining images (of atmosphere with a storm structure building up) but unfortunately the data that is available (i.e. the data I've got to use) has quite...
Hi I've just got a small problem that needs to be cleared here to allow me to do the other questions.
Statement:
Two objects were detected in a 100-sec exposure with 3x4 CCD camera
Now you are given 3 by 4 matrices for the raw image data, bias, dark count and flat field. I've provided a link...