<< Chapter < Page
  Digital signal processing - dsp     Page 14 / 24
Chapter >> Page >

New to j2se 5.0

According to Oracle's documentation, the log10 method became part of Java with the release of J2SE 5.0. Therefore, this code is notcompatible with earlier versions of Java.

Here are a couple of restrictions taken from Oracle's documentation that apply to the use of the method named log10 :

  • If the argument is NaN or less than zero, then the result is NaN.
  • If the argument is positive zero or negative zero, then the result is negative infinity.

Because of the first restriction, the code in Listing 7 converts all negative values into positive values before performing the conversion. Because of thesecond restriction, no attempt is made to compute the log of elevation values of zero.

Otherwise, the code in Listing 7 is straightforward and should not require further explanation.

Normalize the surface elevation data

After converting the elevation data to log form, (or not converting as the case may be) , the code in Listing 8 calls the method named scaleTheSurfaceData to normalize the elevation data by squeezing it into the integer range between 0and 255 inclusive. When this method returns, the lowest elevation has a value of 0 and the highest elevation has a value of 255.

Listing 8. Normalize the surface elevation data.

The elevation data is normalized to this range to make it easier later to form relationships between the elevation values and allowable color values.

(Recall that allowable color values range from 0 to 255.)

The method named scaleTheSurfaceData

At this point, we will take a side trip and examine the method named scaleTheSurfaceData , which is shown in its entirety in Listing 9 .

Listing 9. The method named scaleTheSurfaceData.
double min; double max;//This method is used to scale the surface data // to force it to fit in the range from 0 to// 255. void scaleTheSurfaceData(){//Find the minimum surface value. min = Double.MAX_VALUE;for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ if(data[row][col]<min) min = data[row][col];}//end col loop }//end row loop//Shift all values up or down to force new // minimum value to be 0.for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ data[row][col] = data[row][col] - min;}//end col loop }//end row loop//Now get the maximum value of the shifted// surface values max = -Double.MAX_VALUE;for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ if(data[row][col]>max) max = data[row][col];}//end col loop }//end row loop//Now scale all values to cause the new // maximum value to be 255.for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ data[row][col] =data[row][col]* 255/max; }//end col loop}//end row loop }//end scaleTheSurfaceData

While this method is rather long, it is completely straightforward and shouldn't require further explanation.

Create an appropriate pair of Canvas objects

Return now to the discussion of the constructor for the ImgMod29 class.

Questions & Answers

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.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
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?