User's Manual

Chapter 2 Hardware Overview

Hardware Binarization

The NI 1426 supports binarization and inverse binarization. Binarization

and inverse binarization segment an image into two regions: a particle

region and a background region. Use binarization and inverse binarization

to isolate objects of interest in an image.

To separate objects under consideration from the background, select a pixel

value range. This pixel value range is known as the gray-level interval, or

the threshold interval. Binarization works by setting all image pixels that

fall within the threshold interval to the image white value and setting all

other image pixels to 0. Pixels inside the threshold interval are considered

part of the particle region. Pixels outside the threshold interval are

considered part of the background region.

Inverse binarization flips the assigned bit numbers of the particle region and

the background region. Thus, all pixels that belong in the threshold interval,

or the particle region, are set to 0, while all pixels outside the threshold

interval, or the background region, are set to the image white value.

Figure 2-2 illustrates binarization and inverse binarization.

Figure 2-2. Binarization and Inverse Binarization

NORMAL

Stored Value

Sampled Data

INVERSE

Stored Value

Sampled Data