Processing Definition and 221 Threads

Since signal processing electronics rely on a constant DC power supply with a supply current that can only be converted into a fluctuating DC current by the switching devices of the circuitry, does an AC input signal coming from a microphone or wireless receiver need to be converted into a...

Hi, everyone~ I have a BS in EE, and I want to be a researcher in cosmology or astronomy. To accomplish that I have to get a PHD in such areas. But my major in college was mainly about signal processing and networks. So, I'm wondering if there is any PHD program in cosmology or astronomy that...

I have a couple of questions about the theory about how to tell whether a system is casual and FIR or IIR. First point is about a casual system. Is it true that all FIR systems are casual? How can you tell if an IIR system is casual? I am I correct in thinking that a FIR system only has a...

Has anyone heard of a feature whereby display processing power is linked to system power levels ?eg.: if you're operating on battery rather than wall plug, can that have an effect on whether you get full acceleration when watching videos? My sister claims that, on her Mac, when the battery is...

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...

hi, I've got a really great picture of the carbon atoms in a graphine (HOPG) sample, using STM technique (picture attached). I would like to remove from the picture all the data came from noise etc.. I'm working with MATLAB, and I tried to use fast Fourier transform (fft2), but didn't know how...

Hi, I have a complex time signal x(t)=X1*exp(i*∅)+X2*exp(i*2*∅). On converting to frequency domain, i expect frequency components at ω and twice of ω (when ∅=ω*t). FFT gives the desired frequencies, but the amplitudes don't correspond to X1 and X2. I understand that this is due to the phase...

What is known of how our brain processes our vision and where can I learn about it?

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...

I want to write a code for a MCU, the MCU will output an image to a TFT screen, and here is the tricky part: I want to make the final display to mimic old CRT， which means it will shrink, skew, and out of sync randomly, and the image will be constantly shaking. I hope the FPS would be 60...

I've always wanted to study something that has to do with how information is processed in the brain. I don't know if this sounds silly but almost like "reading" the brain. Perhaps like data/mathematical modelling? I don't really know what educational path I must choose. I am thinking that the...

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

I've designed both types of filters for years and can't really explain the difference in clear simple terms. I'm hoping somebody here can help me out with that. First, some working terminology: RF filter - a filter with a controlled input and output impedance, usually 50 ohms, to match the...

Hello everyone. We all know that conventional data computing technology is not sufficient to make complex mathematical calculations in some sense and we need to look at some other data computing technologies. I did some reading but could not deduce any answers for the following questions...

Is there any recommended books for signal processing for self study? Or like a reference book covering most fields? my final bachelor year has been filled with prescribed papers but I'm thinking I will need to be familiar with signal processing. At the moment I am looking "Digital Signal...

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...

I'm new to the field of signal processing and currently reading a paper which it uses cross-correlation of two signals for detecting some machine failures. But I'm confused with the complex conjugate in the equations. Take equation from wikipedia as example: (f\star g)(t)\equiv \int_{-\infty...

Hey, I'm an EE undergrad looking to tentatively specialize in signal processing. My relevant background includes a course in signals/systems, introductory feedback control (using Nise), analog communication systems (using Haykin), introductory probability, the usual Calc I-IV sequence, linear...

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 ...

In the digital communication class I took, people talk about how to do detection and processing at the baseband. But from what I read, it seems that many systems do the signal processing at some intermediate frequency without mixing it all the way back to baseband. My questions are why and how...

First of all, let me apologize if this question is in the wrong place. It's fundamentally a statistics question but it relates to computer science. I'm also not sure if this falls under the "homework" category, since it's for a class, but I need assistance on a general idea, not a problem set...

Processing raw data absorbances?? Hi, how do you process raw absorbances again, I know that you have to take the mean of the blank and take it away from all the other readings. However I have 9 blank readings? Which ones do I include in the average? The first two, or all of them?

Hey there, (I apologize if this is in the wrong section - please move it if it is) I'm an EE undergrad, and I'm wondering how much embedded software/programming is involved in fields like control and signal processing. To be a bit more specific, by "embedded software," I'm referring to...

Hi, I'm doing ICT (telecommunications) engineering and have enjoyed subjects which involved signal theory (using matlab, Fourier transform, modulation, filters etc). Just wondering if there is a job where I can use the theory/maths that I learned in these subjects?

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...

hello I am in the final year of my electronics engineering technology program and I've really developed an interest in subjects such as analog and digital signal processing, filters, amplifiers, etc. are there jobs in these areas for people at my level? I've been doing some job searching and...

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...

Hi, what mathematics does DSP use? And is it easy to use this knowledge to apply to other areas of study, where it's needed to study signals?

how can i work with images in visual studio c++? i want to work with .jpg images. So how do i store them and access them?

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...

I have a set of discrete data that I have performed multiple Gaussian smoothing filters on to act as a low-pass filter. What I have come up with is something like this: http://i51.tinypic.com/152kieg.jpg I'm using findpeaks() in matlab, and a peak that I want is being taken over by the...

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, Recently I've been very interested into going into signal processing. I have a couple questions... 1) Exactly how much math do you need? Do you need anything past PDE's? 2) How are job prospects for this field? 3) Are you required to do any hands-on stuff? (e.g. build...

Plz help me to find "Digital Image Processing" by Rafael C. Gonzalez and Richard E. Woods Thank you

Hi to every one I want to simulate Rf lab plasma and DC glow discharge plasma But let me make clear one thing Consider me as a starter to both plasma physics and simulation So is there anyone who can help me in this respect to guide me from zero Regards

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...

hi everybody... are there any difference between: image processing and computer vision?

what is the centre of gravity of an image in image processing ?

Hello, Can you suggest me some good Math books about Fourier laplace transforms, convolution, transfert functions and stuff ? Because all I have right now is some crapy math notes and an electricity book that doesn't mention anything about math theory. I tried google but I really don't...

Mathematica problem: Filter: H(jw)=(3.84+5 (j w))/(5+j (1.11 w^2)) Bandwidth where: |H|>1/Sqrt[2]*Hmax Calculate the bandwidht Tips or solution would be much appriciated Thanks

Hello, I'd like to know the relation between the sampling frequency and the quantization. If the sampling frequency is 200KHz, and the analog signal ahs a maximum frequency of 80KHz, How many bits will the qantization be done to have a 6Mb/s bitrate?

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...

what is the difference between zero state step response and step response in an linear time invarient system?

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...

The month long debacle over the BP oil spill, and earlier collapse of a coal mine killing scores of coal miners, makes me wonder: what are the risk to human safety and environmental impact for mining, processing nuclear fuel (i.e uranium, thorium) ? Could acquiring nuclear fuel lead to a...

When the data reaches the CPU via keyboard (suppose I typed the letter "A") So, what are going to be the stages in the CPU. I mean where will data be going first ? ! The Cache ? or RAM/ROM or registers ? ! I know about all the data processing functions they have, but, I am confused...

Hello Group! I'm working on analyzing Raman spectra of proteins. I'm particularly interested in learning more about the signal processing of the amide I band. If anyone has any experience with Peakfit program or Origin, Savitsky-Golay smoothing, or amide I deconvolution for secondary...