Chain Code.pptx

chain code

1. Chain Code Dip Panchal 220170726005

2. Outline Introduction Contour Detection Chain Code Overview CFD,NCFD Application Advantages Limitations Conclusion

3. Introduction Chain code is a technique used in digital image processing for contour detection..
Contours play a crucial role in various applications, such as object recognition, shape analysis, and image segmentation.

4. Contour Detection Contour detection is the process of identifying and extracting the boundaries of objects in an image.
It is an essential step in many image processing and computer vision tasks.
The accurate detection of contours helps in segmenting objects from the background and analyzing their shapes and structures.

5. Chain Code Overview Chain code is a method for representing contours by encoding the sequence of connected pixels along the contour.
It provides a compact representation of the shape of an object.
Chain code follows the boundary of an object, pixel by pixel, starting from a chosen point on the contour.

6. 4-Connected Chain Code 4-connected chain code considers only four neighboring pixels around the current pixel (top, right, bottom, and left).
It assigns a unique number (0 to 3) to each direction, representing the direction from the current pixel to the next pixel on the contour.
The chain code is generated by tracing the boundary of an object using these directional numbers.

7. 8-Connected Chain Code 8-connected chain code considers eight neighboring pixels around the current pixel (top-left, top, top-right, right, bottom-right, bottom, bottom-left, and left).
The chain code assigns a unique number (0 to 7) to each direction, representing the direction from the current pixel to the next pixel on the contour.
The chain code is generated by tracing the boundary of an object using these directional numbers.

8. The First Difference of a Chain Codes Problem of a chain code: chain code sequence depends on a starting point. Solution: treat a chain code as a circular sequence and redefine the starting point so that the resulting sequence of numbers forms an integer of minimum magnitude. The first difference of a chain code: counting the number of direction change (in counterclockwise) between 2 adjacent elements of the code.

9. Applications of Chain Code Chain code has various applications in image processing and computer vision.
It is used for contour matching, where the chain codes of two contours are compared to determine their similarity. Object recognition, where the contour shape is analyzed for identifying and categorizing objects.
Shape analysis techniques rely on chain code for quantifying and comparing object

10. Advantages of Chain Code Chain code offers a compact representation of contours, reducing the storage and computational requirements.
It is invariant to rotation, as the encoding of the contour does not depend on the orientation of the object.
Chain code is relatively simple to implement and can be computed efficiently.

11. Limitations of Chain Code Chain code representation can be sensitive to noise, as noise pixels may introduce deviations in the contour.
It may result in loss of detail in the representation, particularly for complex or highly detailed contours

12. Conclusion Chain code is a valuable tool for analyzing and understanding the shapes and structures of objects in digital images.

13. Thank you