An Introduction to Digital Image Processing with MATLAB - download pdf or read online

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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.

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