IT523 Digital Image Processing Prof. Asim Banerjee Lecture 5 9th August 2007

Elements of DIP System (1/3) IT523 - Digital Image Processing

Elements of DIP System (2/3) Image acquisition Scanners, video camera, CCD cameras, digitizers, etc. Storage Short term storage, on-line storage and archival storage Processing Small personal computers to dedicated processing hardware. IT523 - Digital Image Processing

Elements of DIP System (3/3) Communication Local communication between the processing systems Remote communication for transmission of images Display Monochrome Monitors to sophisticated display devices IT523 - Digital Image Processing

Image Sensing & Acquisition (1/5) Two elements are required to acquire a digital image A physical device that is sensitive to a band in the electromagnetic spectrum (X-ray, Ultra Violet, Visible, Infrared) to produce an electrical signal proportional to the level of energy sensed (i.e. sensors or detectors) A digitizer to convert this signal into digital form. NOTE: There are sensors available that directly give digital output. IT523 - Digital Image Processing

Image Sensing & Acquisition (2/5) The images of interest are those generated by the combination of An illumination source and And the reflection or absorption of the energy from that source by the elements of the scene being imaged. The principal arrangements of the detectors or sensors are: Single imaging sensor Line sensor Array sensor. IT523 - Digital Image Processing

Image Sensing & Acquisition (3/5) IT523 - Digital Image Processing

Image Sensing & Acquisition (4/5) IT523 - Digital Image Processing

Image Sensing & Acquisition (5/5) IT523 - Digital Image Processing

IT523 - Digital Image Processing Preprocessing It improves the image in ways that increase the chances of success for the other processes For example Enhancing contrast Removing noise Isolating regions of interest (ROI). IT523 - Digital Image Processing

IT523 - Digital Image Processing That’s all for now. IT523 - Digital Image Processing