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

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

3. 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

4. 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

5. 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

6. 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

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

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

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

10. 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

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