08-06-2013, 11:32 AM
COLOR & POSITION DETECTION BY IMAGE PROCESSING TECHNIQUES
Color & position detectoin.pptx (Size: 202.95 KB / Downloads: 19)
OVERVIEW OF IMAGE PROCESSING
What is image processing?
- Deals with Analyzing Image data in all Areas & Extracting data from real world images.
Tools for use:
- Matlab,Java.etc.
IMAGE PROCESSING TECHNIQUES
Image acquisition
Image filtering
Image enhancement
Image Threshold
Image Sensor
Simple Image sensor is photodiode.
Constructed from CCD or CMOS
When light strikes, it gives some voltage as output based on intensity.
Filter is used with sensor for selectivity.
How to Obtain 2D image with single sensor?
There must be relative displacement in both the x- and y direction between the sensor & area to be imaged.
Use rotation of a drum and lead screw technique.
Cheaper but slower method for image acquisition.
Image Acquisition using Line sensor
The strip provides imaging in the one direction , while motion perpendicular to strip provided imaging in the other direction.
Used in Flat-Bed scanners
Air born imaging application.
Also used in tomography.
Image Acquisition using Sensor array
Most widely used
Entire image can be scanned without relative displacement.
Light rays reflected from the object are focused on the image plane (sensor array).
Digitizing circuitry converts output voltages of each sensor in to corresponding number. As a result digital output is obtained.
The process of digitizing of image involves 2 main steps. i.e. sampling & quantization