<< Chapter < Page
  Digital signal processing - dsp     Page 4 / 24
Chapter >> Page >

A calibration scale

Each of the images in Figure 1 shows a calibration scale immediately below the image of the surface. The calibration scale shows the color or shade of grayused to represent each elevation on the surface. The color or shade of the lowest elevation is shown on the left of the scale and the color or shade of thehighest elevation is shown on the right.

For example, the scale on the Grayscale image shows a smooth gradient from black to white going from left to right. The shade of gray shown at the midpointon the calibration scale represents the elevation that is halfway between the lowest elevation and the highest elevation.

Color Shift plot

The image in the center in Figure 1 shows the same surface plotted using a smooth gradient from blue at the low end through aqua, green, and yellow to redat the high end. In addition, this plotting format sets the lowest elevation to black and the highest elevation to white so that these two elevations areobvious in the plot.

(The highest elevation was indicated by a small white square at the center in the original program output, and the lowest elevations wereindicated by the black areas near the corners. However, the small white square seems to have faded away in the published version of this plot.)

More information is conveyed

This plotting format can convey a great deal more information to a human observer than the Grayscale plotting format. This is because the human eye candiscern more different colors than it can discern different shades of gray.

(Many years ago, when I was in the SONAR business, the general rule of thumb was that a typical human can discern only about seven shades ofgray from black to white inclusive. Obviously a typical human can discern more than seven different colors.)

The lowest elevations are obvious in the color shift plot

By using black to indicate the lowest elevation, (in addition to using shades of blue to indicate low elevations) , it is easy to determine the exact locations of the lowest elevations in the Color Shift plot in the centerof Figure 1 . On the other hand, the locations of the lowest elevations are not discernable in the Grayscale plot at the left Figure 1 .

Four minor peaks are obvious in the color shift plot

Also, it is obvious from the Color Shift plot that the surface has four minor peaks at the edges of the plot. Although the Grayscale plot has a slight hint ofthose minor peaks, they are certainly not obvious.

By comparing the color at the top of the minor peaks to the color scale below the Color Shift surface, it is possible to estimate that the elevation of theminor peaks is probably somewhere between twenty-five and fifty percent of the elevation of the main central peak. It is clearly impossible to glean that kindof information from the Grayscale plot of the same surface.

The highest elevation is obvious in the color shift plot

Although no longer true in this reproduction of the original computer output, by using white to indicate the highest elevation (in addition to using shades of red to indicate high elevations) , it is easy to determine the exact location of the highest elevation in the Color Shift plot. As explainedearlier, the highest elevation was indicated by a small white square, which was on the cross hairs at the center of the original plot.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Digital signal processing - dsp. OpenStax CNX. Jan 06, 2016 Download for free at https://legacy.cnx.org/content/col11642/1.38
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Digital signal processing - dsp' conversation and receive update notifications?