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Output when the image is too wide

Image 2 shows the output produced by the program when the width of the image is wider than the width of the display window.

Image 2. output for image too wide.

Outproduced when the image is wider than the display windoe.
Image 2. Output for image too wide.

Output when the image is too tall

Image 3 shows the output that is produced when the height of the image is greater than the height of the display window.

Image 3. output for image too tall.

Output produced when the height of the image is greater than the height of the display window.
Image 3. Output for image too tall.

General background information

Students in my courses are frequently required to

  1. Examine the input and output images from an image processing algorithm.
  2. Deduce the nature of the algorithm required to transform the input image into the output image.
  3. Implement the algorithm in program code.
  4. Demonstrate the correctness of their solution.

Items 2 and 4 often require the ability to make precise color measurements on a pixel-by-pixel basis. The sketch that I will explain in this module providesthe ability to make such measurements.

For example, the image shown in Image 4 was created by applying a common mathematical algorithm to the image shown in Image 1 .

Image 4. output produced by a common mathematical algorithm.

Image produced by applying a common mathematical algorithm to the image in Image 1.
Image 4. Output produced by a common mathematical algorithm.

The RGB color values for both images were displayed at the same pixel location. A student would be expected to compare the color values at severallocations, deduce, and then implement the algorithm in program code.

Discussion and sample code

This sketch consists of two Java classes. The code for the driver class named Pr0120a (the one in the leftmost panel of the PDE) is provided in Listing 10 . The code for the runner class named Pr0120aRunner is provided in Listing 11 .

I will break this code down and explain it in fragments.

As shown in Image 1 , this sketch displays the coordinates of the mouse pointer along with the RGB color values of the pixel atthe mouse pointer whenever the user points to a location inside the display window and presses a mouse button.

It is easy to modify the sketch to cause it to display that information without the requirement to press a mouse button.

The sketch also displays the width and the height of the image.

The sketch displays an error message in place of the image if the image is wider or taller than the output display window.

The class named Pr0120a

Beginning of the class

Listing 1 shows the special text that you must include in the code if you plan to use the JavaScript display mode anddisplay the sketch in your HTML 5 compatible browser.

Listing 1 also shows the declaration of three instance variables.

Listing 1. beginning of the class named pr0120a.

//@pjs preload required for JavaScript version in browser. /* @pjs preload="Pr0120a.jpg"; */PImage img; PFont font;Pr0120aRunner obj;
Listing 1. Beginning of the class named Pr0120a.

The setup method

The setup method is shown in its entirety in Listing 2 .

Listing 2. the setup method.

void setup(){ size(400,344);frameRate(30); img = loadImage("Pr0120a.jpg");obj = new Pr0120aRunner(); font = createFont("Arial",16,true);}//end setup
Listing 2. The setup method.

Set the size of the display window

The setup method begins by calling the size method to set the size of the display window. Recall that the call to the size method must be the first line of code in the setup method. If the size method is not called, the display window will be given a default size of 100 x 100 pixels.

Questions & Answers

so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, The processing programming environment. OpenStax CNX. Feb 26, 2013 Download for free at http://cnx.org/content/col11492/1.5
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