IT 523 Digital Image Processing Prof Asim Banerjee
IT 523 Digital Image Processing Prof. Asim Banerjee Lecture 5 9 th August 2007 IT 523 - Digital Image Processing
Elements of DIP System IT 523 - Digital Image Processing (1/3) 2
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. IT 523 - Digital Image Processing 3
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 IT 523 - Digital Image Processing 4
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. IT 523 - Digital Image Processing 5
Image Sensing & Acquisition • The images of interest are generated by the combination of (2/5) those – 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 detectors or sensors are: of the – Single imaging sensor – Line sensor – Array sensor. IT 523 - Digital Image Processing 6
Image Sensing & Acquisition (3/5) IT 523 - Digital Image Processing 7
Image Sensing & Acquisition (4/5) IT 523 - Digital Image Processing 8
Image Sensing & Acquisition (5/5) IT 523 - Digital Image Processing 9
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). IT 523 - Digital Image Processing 10
That’s all for now. IT 523 - Digital Image Processing 11
- Slides: 11