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Introduction

The purpose of this project lab is to introduce how to further manipulate data acquired in grayscale mode and then expand this to the realm of color. This lab is meant as a follow-up to “Video Processing Part 1: Introductory Exercise,”. This lab will implement a grayscale auto-contrast and color image manipulation.

You will complete an introductory exercise to demonstrate your familiarity with the IDK programming environment. You will then complete an introductory exercise in how to use color; and modify a C skeleton to apply simple color masks to video input from the camera.

After this lab, you should be able to effectively and efficiently manipulate grayscale images, as well as modify color images.

You may want to refer to the following TI manuals:

Prelab

Having familiarized yourself with grayscale images in the previous project lab, the first part of the prelab will require you to code a function similar to the flip_invert function you have already designed, while the second part of the prelab will introduce how to use and access color images.

Grayscale

In this part of the prelab exercise, you will develop an algorithm to find the maximum and minimum values of a grayscale input image. Create a function that will process one row of the image at a time and find the overall minimum and maximum intensities in the image.

auto_contrast_find_extrema(in_data, min, max, col)

Color

The NTSC camera acquires images in the color format YCbCr, where Y represents luminosity, Cb the blue component, and Cr the red component. Each image must be converted to 16-bit RGB for output on a standard color computer monitor. The function “ycbcr422pl_to_rgb565” performs this conversion. Knowing how this function converts each pixel to RGB is relatively unimportant, however, knowing the packed (5:6:5) RBG format is essential.

Before we ignore the ycbcr422pl_to_rgb565 function completely, it is useful to look at how it operates. Find the run time of the function by examining the file “ycbcr422pl_to_rgb565.c” and note that it must convert an even number of pixels at a time. If it were possible to have this function process the whole color image at in one function call, how many clock cycles would the function take? Since we are limited in the number of rows we can modify at a time, how many clock cycles should it take to process the whole image one row at a time? To demonstrate the overhead needed for this function, note how many clock cycles the function would take if it converted the whole image two pixels at a time.

RGB (5:6:5). A packed RGB pixel holds 5 bits for red, 6 bits for green, and 5 bits for blue.

Since each color is not individually addressable in the packed RGB format (e.g. bits representing red and blue are stored in the same byte), being able to modify different bits of each byte is necessary. To help clarify what bits are being set/cleared/toggled, numbers can be represented in hex format. For example, the integer 58 can be represented by “00111010” in binary or by “3A” in hex. In C, hex numbers are indicated with the prefix “0x.”

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..
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
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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