![]() Eye – receiving sensor (camera, scanner).The human visual system consists of two primary components – the eye and the brain, which are connected by the optic nerve.In image enhancement, we need to know what types of operations that are likely to improve an image visually.In image compression, we need to know what information is not perceptually important and can be ignored. ![]() Image processing algorithms are designed based on how our visual system works.We will focus more on physiological aspects, which are more easily quantifiable and hence, analyzed.Human perception encompasses both the physiological and psychological aspects.It also comes with an application with GUI interface that allows you to perform various operations on an image.CVIPtools software contains C functions to perform all the operations that are discussed in the text book.I(r,c) = the brightness of the image at point (r,c) where r = row and c = column.The following notation is used to express a digital image:.Each data point is called a pixel (picture element).The “grabbed” image is now a digital image and can be accessed as a two dimensional array of data.The number represents the brightness of the image at that point.The value of the voltage at each instant is converted into a number and stored.Digitization is done by sampling the analog signal or instantaneously measuring the voltage of the signal at fixed interval in time.Digitization of analog video signal is important because computers can only process digital data.Frame grabber is a special purpose piece of hardware that digitizes standard analog video signal.The computer system may be a general-purpose computer with a frame grabber or image digitizer board in it.Control the image acquisition and storage process.Manipulate the image and perform any desired processing on the image data.The software is used for the following tasks:.Image display: monitor, printer, film, video player.Image acquisition: camera, scanner, video recorder.The hardware components can be divided into three subsystems:. ![]()
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