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Through this project, we’re able to use several Low Dynamic Range(LDR) pictures and their exposure times to create a High Dynamic Range(HDR) picture and display it successfully on LDR display.

Limitations and future work

Our project has three major limitations. First of all, since there are parameters in the HDR and Tone Mapping algorithms such as lambda, the scaling factor of the smoothness term in equation() are subjective to different pictures,so it’s hard for us to figure out the parameters. Every time when we input a different series of LDR pictures, we have to readjust the parameters. Therefore, in the future, we hope to come up with an algorithm that could calculate the parameters according to our input pictures.

The second limitation happens when we take a series of pictures with different exposure times, so we have to ensure that everything in the scene has to stay in the same position. Otherwise, the HDR picture will get blurred. It gets harder when we increase the exposure time, since we’re exposed more to hand shaking and the changes of environment. For this, we come up with two solutions for this limitation. On one hand, we can “integrate” the HDR algorithm into hardware. For example, we can build an app in Android so phones are able to take several pictures by themselves and thus our pictures are less vulnerable toward vibration. On the other hand, we can build another algorithm which could pre-process our pictures to ensure that everything stays in the same position. Additionally, for over-exposure pictures, we could increase the ISO(photosensitivity of sensors) to decrease the exposure time.

Our third limitation comes from assumption of our algorithm. When we take those LDR pictures, we assume that the irradiance of each point doesn’t change. In other words, since we’re doing 1-1 mapping(one exposure time to one irradiance), if we change the lighting of environment, it will mess up with the recovering of device’s response curve. Therefore, we’re unable to add radiance from camera flash. This will largely reduce HDR’s real application. We hope to come up with a method to deal with this case.

Finally, we hope to extend our algorithm so that it will be able to manipulate other camera variables, such as aperture size and ISO as we mentioned above. These algorithms will allow us to have more degree of freedom on our control of pictures.

Questions & Answers

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.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
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
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Source:  OpenStax, High dynamic range imaging. OpenStax CNX. Dec 18, 2012 Download for free at http://cnx.org/content/col11471/1.1
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