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<h3 class="sectionHead"><span class="titlemark">5.3 </span> <a
id="x25-470005.3"></a>Histogram</h3>
<!--l. 264--><p class="noindent" ><a name="nip_label_sec:menu-histogram"></a>
<!--l. 266--><p class="indent" > This menu groups operations for finding and transforming
image histograms. <span
class="phvr7t-x-x-80">nip2 </span>represents histograms and lookup
tables as images with <span
class="phvr7t-x-x-80">Type </span>set to <span
class="phvr7t-x-x-80">Histogram</span>. Histograms may
have pixels in any format and any number of bands. You
can only find histograms of unsigned 8- and 16-bit
images.
<dl class="description"><dt class="description">
<span
class="phvb7t-x-x-80">New</span> </dt><dd
class="description">This makes a new ramp histogram. A set of sliders
let you adjust the shape. Use <span
class="phvr7t-x-x-80">Map Histogram </span>to apply
your ramp to an image.
<!--l. 278--><p class="noindent" ><span
class="phvr7t-x-x-80">Build LUT from Scatter </span>makes a histogram from a
matrix of <span
class="cmr-10">(</span><span
class="cmmi-10">x,y</span><span
class="cmr-10">) </span>values.
<!--l. 281--><p class="noindent" ><span
class="phvr7t-x-x-80">Tag Image as Histogram </span>marks an image as actually
being a histogram after all.
<!--l. 284--><p class="noindent" ><span
class="phvr7t-x-x-80">Tone Curve </span>builds a tone curve which you can later
apply to an image.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Find</span> </dt><dd
class="description">A one dimensional histogram treats each band
as an independent variable. An <span
class="cmmi-10">n</span>-dimensional
histogram treats each pixel as a vector of <span
class="cmmi-10">n</span>
elements, where <span
class="cmmi-10">n </span>is the number of bands in the
image.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Map</span> </dt><dd
class="description">Looks up each pixel in the input in the histogram
and sends the found value to the output.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Equalise</span> </dt><dd
class="description">Find the global or locally histogram equalised
image.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Cumulative</span> </dt><dd
class="description">Use
this and friends to calculate a cumulative histogram
(integrate), normalise a histogram and match two
histograms. </dd><dt class="description">
<span
class="phvb7t-x-x-80">Find Profile</span> </dt><dd
class="description">Searches from the edges of an image for the
first non-zero pixel and returns a profile histogram.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Find Projections</span> </dt><dd
class="description">Sum columns and rows in an image.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Plot Slice</span> </dt><dd
class="description">Mark a guide on an image (drag from the
image rulers, or click <span
class="phvr7t-x-x-80">File </span>/ <span
class="phvr7t-x-x-80">New </span>/ <span
class="phvr7t-x-x-80">Guide</span>) and click
<span
class="phvr7t-x-x-80">Plot Slice </span>to make a histogram which is a horizontal
or vertical slice through an image. Use <span
class="phvr7t-x-x-80">Extract Arrow</span>
to extract the area around an arrow or guide. Use
<span
class="phvr7t-x-x-80">Plot Object </span>to make a plot of any object.
</dd></dl>
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