Page 108 - DCAP504_Computer Graphics

Unit 7: 2-D Viewing

The panning technique does not have any rule. Flash of the device can also be used
while panning. Flash works only if the subject is near or if the flash is powerful enough
to have an impact. But this can freeze the subject while giving the background motion
blurred.

Be careful while approaching the panning technique for the first time. Do not use
panning all day long. Sometimes shots must be done at faster speeds. This would result
in giving variety of shots. It is not necessary that the subject will always have the clarity.

Zooming
Zooming is a technique where the size of the object can be changed to view the object in detail.
Zooming is also known as a transformation which helps in scaling or blowing a pixel or a portion of the
pixel with the instructions given by the user. The zooming process reproduces the pixels along the
consecutive scan lines.

Consider an image to be zoomed at the factor of two. This means each pixel is
used four times, twice on each of the two successive scan lines. Figure 7.10
illustrates the example.

Figure 7.10 : Effect of Zooming by a Factor of Two

A Zooming User Interface (ZUI) is a graphical environment where users can change the scale of the
viewed area in order to see more detail or less, and browse through different documents. The virtual
surface can be panned across in two-dimensions by zooming the object.

When a text object is zoomed, it may be represented as a small dot, then a
thumbnail of a page of text, then a full-sized page and finally a magnified view
of the page.

The ZUI uses zooming as the symbol for browsing through hyperlinked information. If a zoomed page
has an object inside it, it is possible to further zoom the image to understand the image in detail. This
allows recursive nesting and an arbitrary level of zoom.
If the detail of the resized object is changed, to fit the relevant information into the current size, then this
process is known as semantic zooming.

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