From: Petter Reinholdtsen <pere@hungry.com>
Date: Sun, 1 May 2005 14:50:54 +0000 (+0000)
Subject: Spread the images.
X-Git-Url: http://pere.pagekite.me/gitweb/homepage.git/commitdiff_plain/e30e9a640ca2127f4d488c4a4d83e26a8c514107

Spread the images.
---

diff --git a/mypapers/drafts/geg2210/assignment-8.html b/mypapers/drafts/geg2210/assignment-8.html
index 79531c0b7d..7e3d51987f 100644
--- a/mypapers/drafts/geg2210/assignment-8.html
+++ b/mypapers/drafts/geg2210/assignment-8.html
@@ -12,23 +12,31 @@
         Photogrammetry</p>
 
     <h1>Image enhancement, filtering and sharpening</h1>
+<img src="jotunheimen-ir-2band.jpeg">
+<img src="jotunheimen-truecolor.jpeg">
+<img src="jotunheimen-std-ir-eq.jpeg">
 
     <p>By Petter Reinholdtsen and Shanette Dallyn, 2005-05-01.</p>
 
-Logged into jern.uio.no using ssh to run ERDAS Imagine.  Started by
-using 'imagine' on the command line.  The images were loaded from
-/mn/geofag/gggruppe-data/geomatikk/
+<p>This exercuse was performed by logging into jern.uio.no using ssh
+and runnign ERDAS Imagine.  Started by using 'imagine' on the command
+line.  The images were loaded from /mn/geofag/gggruppe-data/geomatikk/
 
-Tried to use svalbard/tm87.img, but it only have 5 bands.  Next tried
-jotunheimen/tm.img, which had 7 bands.
+<p>We tried to use svalbard/tm87.img, but it only have 5 bands.  We
+decided to switch, and next tried jotunheimen/tm.img, which had 7
+bands.
 
-The pixel values in a given band is only a using a given range of
+<p>The pixel values in a given band is only a using a given range of
 values.  This is because sensor data in a single image rarely extend
 over the entire range of possible values.
 
+<p>The peak values of the histograms represent the the spectral
+sensitivity values that occure the most often with in the image band
+being analysed.
+
 <h2>Evaluation of the different bands</h2>
 
-<h3>band 1, blue (0.45-0.52 um)</h3>
+<h3>band 1, blue (0.45-0.52 micrometer - um)</h3>
 
   Visible light, and will display a broad range of values both over
   land and water.  Reflected from ice, as those are visible white and
@@ -53,6 +61,7 @@ over the entire range of possible values.
   peaks at 0 and 255.  The mean value is 34.3403.
 
 <h3>band 4, near-infraread (0.76-0.90 um)</h3>
+<img align="right" width="20%" src="jotunheimen-band4-hist.jpeg">
 
   Water acts as an absorbing body so in the near infrared spectrum,
   water features will appear dark or black meaning that all near
@@ -82,20 +91,22 @@ over the entire range of possible values.
   The mean is 24.04, and there are one wide peak at 130 and a smaller
   peak at 83, in addition to one peak at 0.
 
-Image enhancement
------------------
+<h3>Image enhancement</h3>
 
 We can get a good contrast stretch by using the histogram
 equalisation.  This will give us the widest range of visible
 separation between features.
 
-Displaying colour images
-------------------------
+<h3>Displaying colour images</h3>
+
+<p><img width="40%" src="http://home.online.no/~oe-aase/jotunheimen/jotun2000topper.jpg">
+<!-- img src="jotunheimen-map.jpeg" -->
 
-<p>Comparing a map we found on the web,
-<img src="http://home.online.no/~oe-aase/jotunheimen/jotun2000topper.jpg">
-and the standard infrared image composition, we can identify some
-features from the colors used:
+<img width="40%" src="jotunheimen-std-ir.jpeg">
+
+<p>Comparing a map we found on the web, and the standard infrared
+image composition, we can identify some features from the colors
+used:</p>
 
 <ul>
 
@@ -149,11 +160,11 @@ thermal band is actually 4x4 pixels.  Because of this, we tried with a
 
 <p><table align="center">
   <tr><td>
-<tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
-<tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
-<tr><td>-1</td><td>-1</td><td>24</td><td>-1</td><td>-1</td></tr>
-<tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
-<tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
+    <tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
+    <tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
+    <tr><td>-1</td><td>-1</td><td>24</td><td>-1</td><td>-1</td></tr>
+    <tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
+    <tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
   </table></p>
 
 Next, we tried some different weight:
@@ -166,7 +177,8 @@ Next, we tried some different weight:
     <tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
   </table></p>
 
-<p>This one gave more lines showing the borders between the thermal
+<p><img align="right" width="40%"src="jotunheimen-therm-unsharp5x5.jpeg">
+This one gave more lines showing the borders between the thermal
 pixels.
 
 From: shanette Dallyn <shanette_dallyn@yahoo.ca>