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The module covers the techniques and challenges associated with image acquisition

Overview

High quality images are a necessary component of any object recognition system. Factors such as lighting,background, and motion all contribute to the instability of any imaging environment. As soon as one of these factors changes, evenslightly, the ability for a computer to detect an object from an image may be severely hampered. However, pursuing a controlledenvironment is most likely a dead-end. In the context of real world object recognition, environment is often not controlled andsometimes is rapidly changing. For this project, though, we need to create a special imaging environment to minimize the complexity ofimage acquisition.

Lighting

We need to create a semi-ideal environment in which to image the coins. The apparatus is composed of a tough black plastic milk crate, a semi-reflectivewhite foam board piece, and a matte black foam board piece for the imaging base. It is important to create a contained system becauseit allows us to remove, to the best of our ability, the environment variable. Once the box is constructed, we need to determine thebest way to light the coins. Even and consistent lighting is a necessity. To achieve this we need to sufficiently diffuse thelighting as to avoid specular highlighting. We hang the lights from the top of the box at an angle to the outside edges of the box.Doing so allows the incident light to “bounced” off the walls of the box thus diffusing the rays. However, we you will find this to beinsufficient. It became apparent that using cloth, or even a milk jug, is a more effective approach. You can use any materials you have lying around. For example, if you cut out small squares of a white undershirt and strategically place them between the lights and the coins, you can achieve a sufficient level of light diffusion. The process may be time intensive but keep tweaking until you find agreeable results.

Image acquisition apparatus

A picture of the hardware apparatus used to image the coins.

Camera

The camera, a Canon PowerShot S410, suspended from the top of the box, is able to image the coins from a fixed distance and locationfor each take. Because we must image multiple coins at the same time, the camera cannot adjust its shutter speed based on thebrightness of just one coin. Thus, if there are specular highlights on one coin, and not on another, our image would reflect this. Disparities among the coins, due to lighting, are unacceptable. This provides the motivation fortaking great pains to place the lights in a manner provides even lighting conditions.

While we used a Canon camera, any camera should be sufficient as long as it has the ability to take quality images.

Image capture software

We need to be able to quickly capture images without any human intervention. Minute changes in the angle or location of the camera might interfere with the settings in our software. It would also remove the consistency in images we obtain by fixing the camera. We can accomplish this easily using Canon’s Remote Capture software on the computer. With the software, you have controlover exposure, white balance, and ISO levels. On the subject of quality: it needs to be mentioned that any JPEGcompression could result in less reliable results. Because the algorithms used for this project are dependent on recognizingthe unique details of each coin, throwing out any of that information could have drastic effects.

The Canon Remote Capture software comes standard with many Canon cameras. It is available on the Canon website free of charge.

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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Elec 301 projects fall 2006. OpenStax CNX. Sep 27, 2007 Download for free at http://cnx.org/content/col10462/1.2
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