Image Enhancement

Apply Spatial Enhancement

Adjust Image Contrast

• Raster : Multispectral : Enhancement : General Contrast => General Contrast
• Raster : Multispectral : Enhancement : General Contrast => Histogram Equalize
• Raster : Multispectral : Enhancement : General Contrast => Standard Deviation Stretch
• Raster : Multispectral : Enhancement : General Contrast => Brightness/Contrast
  
• Raster : Multispectral : Enhancement : General Contrast => Piecewise Contrast ==> Breakpoints => Adjust Break points and Apply

Filtering using Convolution

• Raste : Resolution : Spatial => Convolution
• under Input File, enter lanier.img
• Under Output File, enter convolve.img
• From the scrolling list under Kernel, click 3x3 Edge Detect.
• Click the Edit button, then Close
• Click OK

• Open lanier.img and colvolve.img, and then display two views

Apply Crisp

• Raste : Resolution : Spatial => Crisp
• Under Input File in the Crisp dialog, enter panAtlanta.img.
• Under Output File, enter crisp.img
• turn on the Stretch to Unsigned 8 bit checkbox by clicking on it.
• Click the View button ( lets you view the graphical model behind each function. )
• Click OK
• Display panAtlanta.img and crisp.img on the separate viewer and compare.