- 671 - 
)hic 
? de- 
- Greyscale manipulation (enhancement) 
; one 
- Color composition 
; ma- 
4. EXAMPLES 
! industry 
iture there 
We have been applying our methods mainly to ERTS frames of Southern 
Bavaria. Therefore one stripe of an ERTS frame showing the region 
data and 
South of Munich serves as example taken on October 6, 1972. 
i proces- 
4.1. ANNOTATION OF SPECTRAL BANDS 
oriented 
After painful experience with our last system where we used to 
guess which spectral band was on which picture and which program 
had produced it, we now spent some time on annotation. The pro- 
scientist 
grammer may now add alphanumerical information of any size and 
ments, as 
ologist, 
ss his 
orientation at any place of the picture. 
The program which played back the picture of our test area writes 
date, time of day, program name at the edge of the picture and 
pointing 
level 
allows changing the spectral band during the 12 minute printing 
process by operator command and marks the spectral band at the 
line where it changed (fig. 2). Display of the information con 
tained in the CCT annotation record is also possible but has not 
ic machine 
been attempted yet. 
might per- 
4.2. GRIDDING AND SELECTION OF WINDOWS 
ast include 
After interesting areas have been identified visually, the problem 
arises to find their exact location in the tape frame. Therefore 
the picture is overlayed by a quadratic grid, which acts as a 
coordinate system. Normally a rectangular window is defined, in 
ures such 
which a specific evaluation is performed. Fig. 3 shows the gridded 
image with a window selected. 
4.3. GREY LEVEL DISTRIBUTIONS 
One of the more useful measurements taken within a window is the 
grey level distribution of all spectral bands. It gives an instant