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SUMMARY: The paper continues on past research into the application of
digital stand scene processing and digital ortophoto processing for the needs of
forest management. Black-and-white aerial photographs obtained during cyclic
surveying of the Republic of Croatia were used for this purpose at an approximate
scale 1:20,000 and 60 % overlap. Research was based on the example
of the management unit “Jamaričko Brdo” of Lipovljani Forest Office.

The most commonly used parameter for quantitative stand descriptions is
density. Since the application of digital processing techniques of stand scenes
in the last ten years has resulted in the development of new methods of stand
density evaluation, an additional possibility was investigated of cyclic photograph
application by constructing second order histograms and establishing
their relationship with three relative density categories.

First order histograms represent a graphic display of the proportion of some
numerical values in the pixels of a digital photograph. Shades of gray ranging
from 0 to 225 are found on the horizontal histogram axis, and the total
number of pixels with these shades is found on the vertical axis.

Texture measures calculated only by means of the first order histogram data
are deficient because they do not give information related to the relative relationship
between the pixels themselves.

Texture may be described by measuring the smudginess (width) of a histogram
around the main diagonal. Such type of textural data does not relate only
to intensity distribution (gray scale) but also to the position of pixels with
the same or similar values.