Image and Graphic Editing

MATLAB (Matrix Laboratory)

A mask is a black and white image of the same dimensions as the original image (or the region of interest you are working on). Each of the pixels in the mask can have therefore a value of 0 (black) or 1 (white).

When executing operations on the image the mask is used to restrict the result to the pixels that are 1 (selected, active, white) in the mask. In this way the operation restricts to some parts of the image.

Some images like icons have a mask stored in them that is used when computing which parts of the image are transparent or not.

There are two types of masks: layer mask which is pixel depended (described above) and vector mask which is a path that clips out the contents of the layer and is pixel independent. It is much easier to edit vector mask by the way using path anchor points.

327328329

Electronics Engineering

Very Large Scale Integration (VLSI)

MATLAB (Matrix Laboratory)

Alternative Current has both negative voltage and positive voltage and that are phases that it must go trough to complete one cycle, A bridge rectifier is nothing more then a rectifier that ac tally rectify both +/- phases to give out pulsating Direct Current of either polarity if wanted.

267268269

Computer Terminology

Image and Graphic Editing

Computer Science

MATLAB (Matrix Laboratory)

Scalable Image Processing Methods for Target Acquisition and Tracking also can be noise at digital images.

See related link, maybe can help you.

221222223

Image and Graphic Editing

MATLAB (Matrix Laboratory)

Autonomous = done automatically by a software (used in robotics)

Image segmentation = dividing the image into parts that can be used later to recognize relevant image features (like objects)

The definition of autonomous segmentation is summing up both terms and refers to a automatic, without human intervention, segmentation of the image. It means that the segmentation algorithms auto-calibrate themselves. This may seem a simple task for a controlled indoor environment, but can also become a huge complexity in outdoor scenes where the lightning conditions are ranging from complete darkness to direct sunlight on the sensor.

173174175

Mobile Phones

Fuel Filters

MATLAB (Matrix Laboratory)

It's a mild tradeoff between the magnitude response of the filter and minimizing the impact of envelope distortion by maintaining a linear phase in the passband. One could argue the same would be achived by a Bessel-Thomson type filter, but this is the extreme of linear phase response. (a gaussian filter to inf dB) which is not necessarily the best compromise when you need to space multiple channels in a given amount of bandwidth. The B-T would be perfect, if your signal were the only one...probably not the case for your application so a gaussian is chosen as a reasonable compromise to prevent inter-channel interference.

114115116

MATLAB (Matrix Laboratory)

Matlab has a built-in function called "demod" in the communications (signal processing) toolbox where you can specify 'fm' for frequency demodulation.

103104105

MATLAB (Matrix Laboratory)

d = det(X) returns the determinant of the square matrix X. If X contains only integer entries, the result d is also an integer.

The determinant is computed from the triangular factors obtained by Gaussian elimination [L,U] = lu(A)

s = det(L) % This is always +1 or -1

det(A) = s*prod(diag(U))

The statement A = [1 2 3; 4 5 6; 7 8 9]

produces A =

1 2 3

4 5 6

7 8 9

This happens to be a singular matrix, so d = det(A) produces d = 0. Changing A(3,3) with A(3,3) = 0 turns A into a nonsingular matrix. Now d = det(A) produces d = 27.

For more info visit

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/det.html

939495

Image and Graphic Editing

MATLAB (Matrix Laboratory)

Rastor images/Bitmaps are images that consist of individual pixels. Memory is a pixel image file format which uses a low ammount of memory due to poor quality. When you emlarge a pixel it reduces the resolution. This would be a good example. Bitmaps are used for windows based systems because it is a basic file with low memory usage.

Vector images consist of indivual shapes and use a low ammount of memory because it is a simple image like a drawing used by shapes. you can modify it without losing quality. Vectors are good because they are a small file size wth unlimited zoom without loss of quality, but they cannot produce photos well. Vector images are used for myspace sites or used as a background in a default picture.

939495

Electronics Engineering

Definitions

MATLAB (Matrix Laboratory)

Any device that outputs a voltage higher than its input voltage. This device can be capacitive, inductive, or other.

798081

Digital Cameras

Software and Applications (non-game)

Image and Graphic Editing

MATLAB (Matrix Laboratory)

How To Add Watermark To A Digital Image: It's relatively easy if you have the software program (it will instruct you step-by-step.) There are so many different software's you will have to go onto: www. google.com to decide which one is right for you. Type in: Software for watermarking digital imagery. This will enable you to watermark ANYTHING and just not digital images. There are two types of watermark one that is visible and another the is invisible :)Also you can add watermark to protect image or to protect important image hidden inside normal image. I use Aoao Photo Watermark Software for protecting my images by visible watermarks: http://www.aoaophoto.com/

717273

Google

Web Downloads

Picture and Image Searches

MATLAB (Matrix Laboratory)

No One Can Upload Images To Google Images,

Those Images Are Crawled By Google Robots.

One great way to have photos uploaded to Google Images is to save the file name just as you want Google to list it in Google Images.

Make sure this Image is then uploaded onto a website that is listed in Google Search Results.

When the spider searches the web page, Google will identify the image automatically and list it in Google Images.

There may be other ways, however, this is a good start.

697071

Software and Applications (non-game)

Electronics Engineering

Image and Graphic Editing

MATLAB (Matrix Laboratory)

The Average (mean) filter smooths image data, thus eliminating noise. This filter performs spatial filtering on each individual pixel in an image using the grey level values in a square or rectangular window surrounding each pixel.

For example:

a1 a2 a3

a4 a5 a6 3x3 filter window

a7 a8 a9

The average filter computes the sum of all pixels in the filter window and then divides the sum by the number of pixels in the filter window:

Filtered pixel = (a1 + a2 + a3 + a4 ... + a9) / 9

697071

MATLAB (Matrix Laboratory)

plot(abs(fft(vectorname)))

the FFT function returns a complex vector thus when you plot it, you get a complex graph. If you plot the absolute value of the FFT array, you will get the magnitude of the FFT.

656667

Image and Graphic Editing

Canon

Computer Maintenance

MATLAB (Matrix Laboratory)

there are two types of image processing.

1.analog 2.digital.

414243

MATLAB (Matrix Laboratory)

# What is mat lab? # What does mat lab stands for? # What does mat lab do? # How are solutions expressed in mat lab? # What are the advantages of using mat lab? # What is the basic data element of mat lab? # Does matrix in mat lab require dimensioning? # What are toolboxes? # What areas are toolboxes are available in? # What are different types of system mat lab can handle? # What is the statement for linear convolution? # What is the statement for cross correlation? # What is the statement for auto correlation? # Statement for finding FFT? # What is the language used in mat lab? # What is a vector (reference to mat lab)? # What is matrix? # Syntax for simple array definition? # Significance of increment in array definition? # Why is terminate needed in array definition? # How is a matrix defined? # How are different row elements separated? # If we don't use a comma in separating elements of same row what else we can do? # What is a plot? # What function is used to generate a 3D graphic? # How many digits mat lab shows by default? # Syntax of hyperbola tangent function? # Syntax for inverse cosine function? # Function for complex conjugate? # Function for real part? # Function for imaginary part? # What does fix stand for? # What does ceil and floor stand for? # Command for polar coordinate plot? # Command for discrete sequence plot? # How do we label x and y axis? # How can we take values from the user? # What are the applications of dip in image processing? # What is signal? # What is a oneD and 2D signal? # What is a continuous and discrete signal? # What are random signals? # What are periodic signals? # What are stable systems? # What is the order of the system?

333435

Electrical Engineering

MATLAB (Matrix Laboratory)

A CT is a current transformer, used to measure current flow in a conductor. Neutral is power return, usually grounded at the distribution panel. A neutral CT, then, is a device that measures the current flow in the neutral conductor. In a three phase star system, each phase returns current to neutral, but the three phases cancel each other out, resulting in effectively zero current in neutral. The neutral CT is used to detect an imbalance in the system, perhaps caused by a ground fault or by some failure in one of the phase loads. In a single phase, single ended system, there is current on neutral, so the value of a neutral CT is not so great. If you also had a hot CT, you could compare and detect imbalance between hot and neutral, which would be an indication of a ground fault. (Actually, a ground fault current interrupting device, also called a GFCI, usually compares current in hot and neutral simultaneously, because both conductors are wound together as the sensing transformer primary - any perceived current is a ground fault.) In a single phase, double ended system, such as the 120/240 split phase system used in the US, a current CT could indicate ground fault or a system imbalance but, usually, imbalance might be a normal situation as various loads are turned on and off.

454647

Biology

MATLAB (Matrix Laboratory)

advantages and disadvantages of image processing is similar to advantages and disadvantages of digital image processing

345

Global Positioning Systems (GPS)

Math and Arithmetic

Image and Graphic Editing

MATLAB (Matrix Laboratory)

Edge detection generally applies to a square wave signal, such as a clock pulse or a trigger pulse. Then the edge detection comes from either using the rising voltage, or the falling voltage of the signal (usually a square wave) to trigger the next event. Using the falling voltage implies a delay in the signal and the rising pulse to trigger an immediate `step` in the circuit.

454647

MATLAB (Matrix Laboratory)

try yourself

212223

MATLAB (Matrix Laboratory)

zeros makes a matrix of the specified dimension, filled with zeros.

373839

MATLAB (Matrix Laboratory)

% program to design butterworth low pass filter

clc;

clear all;

close all;

alphap=input ('enter the pass band ripple');

alphas=input('enter the stop band ripple');

fp=input('enter the pass band freq');

fs=input('enter the stop band freq');

F=input('enter the sampling freq');

omp=2*fp/F;oms=2*fp/F;

%to find cut off freq and order of the filter

[n,wn]=buttord(omp,,oms,alphap,alphas);

% system function of the filter

[b,a]=butter(n,wn,'step');

w=0:0.01:pi;

[h,om]=freq(b,a,w);

m=2*log(abe(h));

an=angle(h);

subplot(2,1,1);

plot(om/pi,m);

ylabel('magnitude');

xlabel(''om/pi);

title('magnitude');

subplot(2,1,2);

plot(om/pi,an);

ylabel('phase angle');

xlabel('om/pi');

title('phase angle');

394041

Very Large Scale Integration (VLSI)

MATLAB (Matrix Laboratory)

e genec

333435

MATLAB (Matrix Laboratory)

coupling many stages of boost converters

333435

MATLAB (Matrix Laboratory)

Cleve moler

333435

Physics

Image and Graphic Editing

MATLAB (Matrix Laboratory)

ya definetely.

789

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