Editing Eye pattern (section)

=== Integration ===

The samples are then accumulated into a two-dimensional [[histogram]], with the X axis representing time within the UI and the Y axis representing voltage. This is then [[Feature_scaling|normalized]] by dividing the value in each histogram bin by the value in the largest bin. [[Tone mapping]], logarithmic scaling, or other mathematical transformations may be applied in order to emphasize different portions of the distribution, and a color gradient is applied to the final eye for display.

Large amounts of data may be needed to provide an accurate representation of the signal; tens to hundreds of millions of UIs are frequently used for a single eye pattern. In the example below, the eye using twelve thousand UIs only shows the basic shape of the eye, while the eye using eight million UIs shows far more nuance on the rising and falling edges.

<gallery widths="400px" heights="250px">
Eye_pattern_2.png|Eye pattern of twelve thousand UIs of a 1.25 Gbit/s signal
Eye_pattern_example.png|Eye pattern of eight million UIs (unit intervals) of a 1.25 Gbit/s signal
</gallery>