Could ImageJ be ported to a Mobile Phone?

[Chien-Chun Huang]

Hi, All:

    I have a Sony Ericssion Mobile Phone W900i with 470mb memory.
    I am wondering if ImageJ could be ported to a Mobile Phone.
    Is it possible?

Regards,
chienchun

[dscho]

Hi,

On Sat, 19 Aug 2006, Chien-Chun Huang wrote:

>     I have a Sony Ericssion Mobile Phone W900i with 470mb memory.
>     I am wondering if ImageJ could be ported to a Mobile Phone.
>     Is it possible?

Certainly. You would have to redo quite a bit of the user interface,
though: AFAIK JME does not implement AWT.

Ciao,
Dscho

[Stuart Anderson-3]

Does anyone know where I might find information on the mathematics of the gamma
correction tool in the ImageJ Math menu?

I've been using the Plot Profile tool to produce spectral plots from images
obtained by a USB camera that's part of a CD-based grating spectrometer.  The
raw signals from the camera are linear at low intensities (doubling the light
intensity produces a doubling of the signals), but quite non-linear at higher
intensities.  I understood that a gamma correction might fix this roll-off, and
it does help.  With my camera a gamma of 1.4 seems to be about right.  That is,
after a gamma correction of 1.4 the Plot Profiles of the corrected images do
double when the intensity is doubled.

However, the odd thing is that the gamma process, applied to the image before
the Plot Profile operation, yields results that are not one-to-one within the
Profile.  That is, a given value in the Plot Profile of the unprocessed image
can correspond to several different values in the Plot Profile of the gamma-
processed image (including zero and non-zero values).  I can see how - since the
gamma is applied to the image before the Plot Profile is calculated - this might
be the case, especially if the gamma correction is different for each of the RGB
components, but I'd like to understand this better than I do.

So, if anyone knows where I can find documentation on what the ImageJ / gamma
process does that would be very useful.

Thanks - Stu

[Stuart Anderson-3]

Never mind - it's right there in the online documentation...Sorry about that.

Quoting Stuart Anderson <[hidden email]>:

> Does anyone know where I might find information on the mathematics of the
> gamma
> correction tool in the ImageJ Math menu?
>
> I've been using the Plot Profile tool to produce spectral plots from images
> obtained by a USB camera that's part of a CD-based grating spectrometer.  The
>
> raw signals from the camera are linear at low intensities (doubling the light
>
> intensity produces a doubling of the signals), but quite non-linear at higher
>
> intensities.  I understood that a gamma correction might fix this roll-off,
> and
> it does help.  With my camera a gamma of 1.4 seems to be about right.  That
> is,
> after a gamma correction of 1.4 the Plot Profiles of the corrected images do
>
> double when the intensity is doubled.
>
> However, the odd thing is that the gamma process, applied to the image before
>
> the Plot Profile operation, yields results that are not one-to-one within the
>
> Profile.  That is, a given value in the Plot Profile of the unprocessed image
>
> can correspond to several different values in the Plot Profile of the gamma-
> processed image (including zero and non-zero values).  I can see how - since
> the
> gamma is applied to the image before the Plot Profile is calculated - this
> might
> be the case, especially if the gamma correction is different for each of the
> RGB
> components, but I'd like to understand this better than I do.
>
> So, if anyone knows where I can find documentation on what the ImageJ / gamma
>
> process does that would be very useful.
>
> Thanks - Stu
>

*************************************************
Stuart M. Anderson
Associate Professor of Physics
Augsburg College
2211 Riverside Avenue
Minneapolis, MN  55454

Tel: [phone]
Internet: [hidden email]

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