18-01-2012, 11:22 AM
IMAGE PROCESSING TECHNEX08@IT-BHU
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Q. What is image processing?
-Study of various attributes of image
-Changing various attributes of original image
-Segmentation and restoration
-Edge extraction
AND MANY MORE………………….
DIGITAL PROCESSING OF ANY SIGNAL LIKE IMAGE
AN IMAGE IS DEFINED AS A 3 CO-ORDINATE FUNCTION f(x,y,z) WHERE x,y,z ARE SPATIAL CO-ORDINATES.
THE AMPLITUDE OF FUNCTION “f” IS DEFINED AS INTENSITY.
DIGITAL REPRESENTAION
1.DIGITIZING THE CO-ORDINATE VALUE IS CALLED SAMPLING
2.DIGITIZING THE AMPLITUDE VALUE IS CALLED QUANTIZATION.
THUS WHEN x,y,z AND AMPLITUDE VALUES OF ‘f’ ARE ALL FINITE , DESCRETE IS CALLED THE IMAGE A DIGITAL IMAGE .
Processing Under Matlab
Coordinate convention :The following figure illustrates the spatial coordinate system used for images. Notice that y increases downward
Basics Of Matlab
-Image is treated as an array in Matlab which can be in any format like RGB,Grayscale,BW,Intensity.
-Function[output variables]=name(input variables).Function should be written in an M-file.
-For calling function say ‘add’ type add(4,5) in the prompt.
Image Capturing.
-Make a video input object.
-Set various attributes of the object.
-Take Snap Shots.
-Save images in an array
