An Introduction to Digital Image Processing with MATLAB - download pdf or read online
By Alasdair McAndrew
Read or Download An Introduction to Digital Image Processing with MATLAB (draft) PDF
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This booklet presents an individual wanting a primer on random signs and techniques with a hugely available creation to those topics. It assumes a minimum quantity of mathematical historical past and specializes in ideas, similar phrases and fascinating purposes to numerous fields. All of this can be stimulated through quite a few examples applied with MATLAB, in addition to quite a few routines on the finish of every bankruptcy.
Prof. Dr. Benker arbeitet am Fachbereich Mathematik und Informatik der Martin-Luther-Universität in Halle (Saale) und hält u. a. Vorlesungen zur Lösung mathematischer Probleme mit Computeralgebra-Systemen. Neben seinen Lehraufgaben forscht er auf dem Gebiet der mathematischen Optimierung.
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Extra info for An Introduction to Digital Image Processing with MATLAB (draft)
However, there is a command which is more convenient, and does most of the work of colour mapping for us; we discuss this in the next section. 16 The imshow function Greyscale images We have seen that if x is a matrix of type uint8, then the command imshow(x) will display x as an image. This is reasonable, since the data type uint8 restricts values to be integers between 0 and 255. However, not all image matrices come so nicely bundled up into this data type, and lots of Matlab image processing commands produces output matrices which are of type double.
2. ARITHMETIC OPERATIONS 39 The point of the second command was to find the numeric data type of b; it is uint8. The unit8 data type is used for data storage only; we can’t perform arithmetic operations. If we try, we just get an error message: >> b1=b+128 ??? Error using ==> + Function ’+’ not defined for variables of class ’uint8’. We can get round this in two ways. 3. 4 shows some examples of functions which will have these effects. To implement these functions, we use the immultiply function.
Can you find imaging tasks it is unable to do? 11. Type in the command >> help imdemos This will give you a list of, amongst other things, all the sample TIFF images which come with the Image Processing Toolbox. Make a list of these sample images, and for each image (a) determine its type (binary, greyscale, true colour or indexed colour), (b) determine its size (in pixels) (c) give a brief description of the picture (what it looks like; what it seems to be a picture of) 12. tif. Using the imwrite function, write it to files of type JPEG, PNG and BMP.