Imaging Imaging is the process of acquiring images. Shorthand for image acquisition. Process of sensing our surroundings and then representing the measurements that are made in the form of an image. Passive imaging – employs energy sources that are already present in the scene. Active imaging – involves use of artificial energy sources to probe our surroundings.
Imaging Contd… Passive imaging is subject to the limitations of existing energy sources. Active imaging is not restrictive in this way but is invariably a more complicated & expensive procedure. Active imaging predominates in medical field, where precise control over radiations sources is essential. Active imaging is also an important tool in remote sensing.
Why prefer Light in imaging? Light is familiar, and inherently safe. Light can be generated reliably and cheaply. Light is easy to control and process with optical hardware. Light can be detected easily.
Image Defined A 2-D function, f( x, y ), where x and y are spatial(plane) coordinates, & the amplitude of f at any pair of coordinates (x, y) is called the intensity or grey level of the image at that point. When x, y, and the amplitude values of f are all finite, discrete quantities, we call the image a digital image. Imaging machines cover almost the entire EM spectrum, ranging from gamma to radio waves.
Fundamental Steps in a DIP Image Acquisition Image Enhancement Image Restoration Color Image Processing Wavelets Compression Morphological Processing Segmentation Representation and Description Recognition