LING 111 Teaching Demo By Tenghui Zhu Introduction to Edge Detection Image Segmentation.

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Introduction to The Edge

Presentation transcript:

LING 111 Teaching Demo By Tenghui Zhu Introduction to Edge Detection Image Segmentation

Overview Review on Image Data Structures Purpose of Image Segmentation Basic Image Segmentation Algorithm –Edge Detection

Overview Review on Image Data Structures Purpose of Image Segmentation Basic Image Segmentation Algorithm –Edge Detection

Image Data Structures grayscale images : (Center) each pixel = a value between monochrome images: (Left) each pixel = a single 0 or 1 value Color Images: (Right) each pixel = three values (red, green and blue - RGB).

Image Data Structures grayscale images : (Center) each pixel = a value between monochrome images: (Left) each pixel = a single 0 or 1 value Color Images: (Right) each pixel = three values (red, green and blue - RGB).

Overview Review on Image Data Structures Purpose of Image Segmentation Basic Image Segmentation Algorithm –Edge Detection

One Image Segmentation application

Any other Image Segmentation application ? Satellite Images for CIA Medical Images for NIH Face Recognize for FBI Etc…

Overview Review on Image Data Structures Purpose of Image Segmentation Basic Image Segmentation Algorithm –Edge Detection

Edge Detection — 3x3 Filtering

5

Edge Detection Filters R 1 R 2 R 3 R 4

Edge Detection

Constrains of Edge Detection

Overview Review on Image Data Structures Purpose of Image Segmentation Basic Image Segmentation Algorithm –Edge Detection Next time, we will talk about another basic Image Segmentation Algorithm -- Histogram

Thank you !

Gray Scale Image - bimodal Image of a Finger Print with light background

Bimodal - Histogram Image Histogram of finger print

Segmented Image Image after Segmentation

Gray Scale Image - Multimodal Original Image of lena

Multimodal Histogram Histogram of lena

Segmented Image Image after segmentation – we get a outline of her face, hat, shadow etc

Colour Image - Multimodal Colour Image having multi-modal histogram

Histogram Image Histogram for the three colour spaces

Segmented Image

Overview Review on Image Segmentation –Algorithm (Without User Interaction) Edge Detection Statistics (Histogram etc…) –Tools (With User Interaction) Magic Wand Intelligent Scissors Graph Cut

Conclusions Conclusions GrabCut – powerful interactive extraction tool Iterated Graph Cut based on colour and contrast Regularized alpha matting by Dynamic Programming