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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

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
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
ya I also want to know the raman spectra
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
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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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