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Example:

  • int black = 0x00; // black = 0
  • int foo_h = 0xF0; // foo_h = 240
  • int foo_l = 0x0D; // foo_l = 13

Another thing to note is that each pixel requires two bytes of memory, requiring two memory access operations to alter each pixel. Also NOTE that in a row of input color data, the indexing starts at 1. Thus RGB[1] contains red/green data and then RGB[2]contains the green/blue data – both for the first pixel.

What is the packed RGB value for the highest intensity green? What is the value of the first addressable byte of this ‘hi-green’ pixel? What is the value of the second byte?

Now, say you are given the declaration of a pixel as follows:

int pixel;

Write a simple (one line is sufficient) section of code to add a blue tint to a pixel. Do the same for adding a red tint, and for a green tint (may require more than one line).Use the and (represented by an ampersand) operator to apply a mask.

Implementation

The first part of this lab will require you to write a function to perform auto-contrasting. You should use your function from prelab 2.1 to obtain the maximum and minimum values of the image, and then create another function to do the appropriate scaling.

The second part of this lab will involve implementing some simple, and hopefully cool, color effects.

Grayscale

Use the function you designed in prelab 2.1 to create an algorithm to auto-contrast the image. Auto-contrast is accomplished by scaling the pixel value from the min-to-max range to the full range. This effect is seen below:

(left) Frequency of a grayscale image with pixel intensities ranging in value from 32 to 128, and (right) Frequency of the same grayscale image after performing an auto-contrast.

Recall from “Introduction to the IDK” that the DSP has a floating point unit; the DSP will perform floating point instructions much faster than integer division, quare-root, etc.

Example:

  • int opposite, adjacent;
  • float tan;
  • tan = ((float) opposite) / ((float) adjacent);

This function should be called similarly to the flip_invert function in the previous lab. Once you have implemented your function, look for ways to optimize it. Notice that you must loop through the image twice: once to find the minimum and maximum values, and then again to apply the scaling. (Hint: the function dstr_rewind rewinds the image buffer).

Use the same core files for this part of the lab as were used in the previous lab. You may simply make a copy of the previous lab’s folder and develop the necessary code from there.

Color

In this part of the lab, you will use the concepts from the prelab to implement certain effects.

Copy the directory “V:\ece320\projects\colorcool” to your W: drive.

We want to use a certain area of the screen as a "control surface". For example, the fingers held up on a hand placed within that area can be used as a parameter, to control the image on the screen. Specifically, we will use the total brightness of this control surface to control the color tint of the screen.

You are given a shell program which takes in a color input frame in YcbCr format and converts it to RGB. You will modify this shell to

  • 1. Calculate the total brightness
  • 2. Calculate the tint for each color component R, G and B.
  • 3. Apply the tint to the image

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
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.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Ece 320 spring 2004. OpenStax CNX. Aug 24, 2004 Download for free at http://cnx.org/content/col10225/1.12
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