Lesson 4 - Point Operations (Single Operand)
This lesson demonstrates point operations using VisiQuest:
Image Representation | Image Visualization | Image Statistics | Pixel Overflow | Image Visualization | Image Statistics | Pixel Overflow | Image Visualization | Image Statistics | Pixel Overflow | Pixel Overflow | Data Type Conversion
Each section takes you through an incremental portion of the lesson while building on skills learned in previous lessons and sections.
The pixel values of a digital image can be a single scalar value or a vector with values called elements. What the elements mean depends on the color model used.
Use a segmentation method to set background values for pixels below a threshold and a different set values for the foreground.
Section 3 - Window-Level Contrast Enhancement
Use an interactive contrast enhancement tool.
Section 4 - Histogram Stretch Contrast Enhancement
Use a contrast enhancement technique using the minimum and maximum pixel values of the image.
Section 5 - Histogram Equalization
Use a contrast enhancement technique to obtain a new enhanced image with an uniform histogram.
Section 6 - Logarithm Contrast Enhancement
Apply a logarithm color table to brighten dark images.
Section 7 - Logarithm Contrast Enhancement/Scaling
Use scaling to improve the results of logarithm contrast enhancement on an image.
Section 8 - Exponential Contrast Enhancement
Use and exponential color table to darken an image which is too bright.
Section 9 - Pseudo-color Applications
Assign arbitrary colors to a greyscale image to improve visualization.
Section 10 - Building Pseudo-color Tables
Build a pseudo-color table to be applied in an image.
Section 11 - Display of Image Attributes
Measure the area of connected regions in an image.
Section 12 - Bit Plane Slicing
Slice an image at different planes for data compression applications.