Fig. 1. (a) A hazy aerial image. (b) The aerial image after automatic haze removal. (c) Local interactive haze
removal with motion of mouse.
|Fig. 2. (a) Another hazy aerial image. (b) The aerial image after haze removal.
|Image Registration and Fusion Systems
Outdoor images often contain haze. The presence of haze reduces image contrast and makes visual
examination of images difficult. A software developed by Image Fusion Systems Research removes most
haze from an image. The software removes haze interactively or automatically. Interactive haze removal is
achieved with the motion of the mouse. Automatic haze removal is achieved without user interaction.
Examples of interactive and automatic haze removal by this software are given below. Fig. 1a shows a hazy
image, Fig. 1b shows the image after automatic haze removal, and Fig. 1c shows the image during
interactive local haze removal. Details not visible in the hazy image become visible after haze removal.
Fig. 3. Additional examples of automatic haze removal by this software. Both gray-scale (8 bits/pixel) and color
(24 bits/pixel) images can be used with this software.
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The software displays the hazy image in two windows side by side. The left window shows the original hazy
image and the right window shows the image after haze removal. Side-by-side viewing enables comparison
of images before and after haze removal. A snapshot of the image viewer for this software is shown below.
For very large images, the images are scaled down to fit the screen. However, the user may pan and zoom
the image to view desired local areas. This is demonstrated below. The pan and zoom operations of the two
windows are synchronized to facilitate viewing of the same areas before and after haze removal.
|Fig. 5. Actual operation of the software in a side-by-side viewer. (top) Global viewing. (bottom) Local viewing.
Fig. 4. If haze removal is applied to a medical image, it will bring out details that are hidden in low-contrast
areas as shown in the above chest X-ray. This X-ray image is courtesy of MedPix.
Additional capabilities of the software are:
- Drag and drop capability: You can select the file(s) to be processed from a file selection window, or drag file(s) to the
haze remover to initiate the haze removal process.
- Multiple simultaneous image haze removal: You may select a single file or multiple files for haze removal.
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