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# Digital image processing using matlab pptpdf

Use imnoise We will be concerned with two ways of generating noiseout imnoise(im, gaussian, mean, var out imnoise(im, salt pepper, prob First method generates Gaussian-based noise Usually encountered in transmitting process.

If we have an image that is 20 rows x 40 columns: If scale 2, the output 40 rows x 80 columns If scale.5, the output 10 rows x 20 columns method determines the type of interpolation when resizing Important when making an image.

R/W Images in matlab (7) Use figure command to create a new blank window Then, run the imshow command to display the image on the other window We can also do: imshow(im 1 Shows red channel imshow(im 2 clone wars season 1 episode list Shows green channel imshow(im 3 Shows blue.Advanced Enhancement (1) Above cases are when the image has bad contrast A good image should have good contrast.e.In addition, a supplemental set of matlab code files is available for download from the publisher's Web site.Image formation, camera models, light and color, linear filters and edges.2, 3 Homework: Assignment 3 out March 1 Epipolar geometry: PPT, PDF Reading: F P sec.Each column location patch pes 2013 terbaru 6.1 indowebster of each row in I has a value The pair (p, I(p) is a pixel (for picture element) p (r,c) pixel location indexed by row r column c I(p) I(r,c) Value of the pixel at location p If I(p) is a single.We perform convolution, but with a different mask Corresponds to discrete approximation of the derivative Two possible masks we can use: Prewitt 3 x3 Mask Sobel 3 x 3 Mask These masks detect changes in the horizontal direction If there are no changes, then weighted.(2) How can I get and/or use matlab?matlab and, image Processing Toolbox are used throughout the text to solve numerous application examples.Intro to Image Histograms (4) Grabbing all of the pixels in any channel will produce a grayscale image, which can be used for imhist We can also call the histogram function by: h imhist(im Will create a 256 element array, where the (i1)th element contains.Blur / Smooth Images (9) imfilter performs image filtering using masks Essentially convolution Filtering Produce an output image that changes the frequency content of the image Blurring, Sharpening, Detecting Edges, etc.Lets try blurring/smoothing images Blurring?Intro to Convolution (5) When we do a point by point multiplication, we will now have 9 numbers: a*z, b*y, c*x, d*w, e*v, f*u, g*t, h*s, i*r 3) Create an output image and: a) Add up all of these values b) Store the output.Reading in Images Accessing Pixels Changing Image Pixels Obtaining a SubsetDisplay Images Monochromatic and Colour Displaying Colour Channels Separately Writing Images to File.Comp 776: Computer Vision, spring 2011, T TH 3:30-4:45 SN 115.Intro to Convolution (4) Example: Our 3 x 3 subset has pixels: a b c G d e f g h i Our mask has the following quantities z y x H w v u t s.Name* Description Visibility Others can see my Clipboard.Pix im(row, col,1 Red colour value pix im(row, col,2 Green colour value pix im(row, col,3 Blue colour value 3rd argument 3rd dimension of matrix Only grabs one colour value at a time!Makes linear algebra, numerical analysis and optimization a lot easier matlab is a dynamically typed language Means that you do not have to declare any variables All you need to do is initialize them and they are created matlab treats all variables as matrices Scalar.