7Image portrayal



7.1 Introduction

This complex subject is difficult to approach because of the extensive interrelations between different areas. Figure 7.1 illustrates the number of dimensions involved. An image is two-dimensional and so there are the horizontal and vertical picture axes to consider. In film, the picture is continuous and sampling occurs only in the time axis. In analog television, the horizontal axis of the picture is continuous but the vertical axis is sampled into lines. In digital imaging the picture will be sampled in both axes to produce an array of pixels having a certain resolution. This chapter includes the theory necessary to link pixel counts to resolution.

In a monochrome image, each pixel describes a single ...

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