1. DIGITAL IMAGE
PROCESSING
INTRODUCTION
Processing of Images which are Digital in nature by
means of Digital Computer
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Manas Ranjan Mantri (mr.mantri@gmail.com)
2. Digital Image Processing
Why do we need Digital Image Processing?
ï§ Improvement of pictorial information for
human perception
ï§ Efficient storage and transmission
ï§ Image processing for autonomous
application
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3. Human Perception
Image processing employ methods capable
of enhancing pictorial information for
human interpretation and analysis.
Typical applications:
ï Noise filtering
ï Contrast enhancement
ï De-blurring
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4. Image Enhancement
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Noisy Image
Filtered Image
5. Image Enhancement
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Low contrast Image
Enhanced Image
6. Image Enhancement
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Enhanced Image
Darker Image
7. Image Enhancement
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Enhanced Image
Brighter Image
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Image Enhancement
Blurred Image
Deblurred Image
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Image Enhancement
Blurred Image
Deblurred Image
10. Medical Imaging
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Original Image
Enhanced Image
11. Machine Vision Application
Here we extract information which are
suitable for computer processing.
Typical application:
ïș For product assembly and inspection
ïș Automated target detection and tracking
ïș Finger print recognition
ïș Aerial and satellite imagery for weather
prediction
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15. Radar Imaging
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Image of Mountain
16. Steps in Digital Image Processing
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17. Image Acquisition
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Imaging sensor & capability to digitize
the signal collected by the sensor
ï§ Video camera
ï§ Digital camera
ï§ Conventional camera & analog-to-digital
converter
18. Preprocessing
ï§ To improve the image to ensure the
success of further processes
ï§ e.g.
ï Enhancing contrast
ï Removing noise
ï Identifying information-rich areas
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19. Segmentation
ï§ To partition the image into its
constituent parts (objects)
ï Raw data, depicting either boundaries or
whole regions (corners vs. texture for
example)
ï Need conversion to a form suitable for
computer processing
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20. Representation & Description
ï§ Feature selection (description) deals
with extracting:
ï Features that result in quantitative
information of interest
ï Features that are important for
differentiating one class of objects
from another
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21. Recognition & Interpretation
ï§ To assign a label to an object based on
information provided by the descriptors
ï§ To assign meaning to a group of
recognized objects
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22. Knowledge Base
Knowledge database
ïș Guides the operation of each processing
module and controls the interaction
between modules
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24. Questions???????
1. Define Digital Image Processing.
2. What is the need of Digital Image Processing?
3. What are the various fields that use digital image
processing ?
4. What are the fundamental steps in digital image
processing?
5. What are the components of Image processing
system?
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