> On 3/5/2010 12:35 PM, Jerry Avins wrote:
>> glen herrmannsfeldt wrote:
>>> Jerry Avins <jya@ieee.org> wrote:
>>>> Sylvia wrote:
>>>>> I am searching for a robust wavelet based MATLAB toolbox that could
>>>>> be used
>>>>> for complex images. There are some good toolboxes available however
>>>>> they
>>>>> can only work for real images.
>>>
>>>> I know what complex numbers are, but what is a complex image? Can it
>>>> be reproduced by printing?
>>>
>>> I don't know about complex, but there are some cases in optics
>>> where phase information is important. If you represent amplitude
>>> and phase as a complex number then that would count.
>>>
>>> Holography, in some sense, stores both the amplitude and phase
>>> of the reflected beam, and holograms are difficult to reproduce
>>> by intensity based reproduction systems.
>>
>> I used to make monochrome holograms using high-resolution
>> black-and-white photographic plates. Those holograms recorded depth. On
>> the other hand. Lippmann photographs used phase (in a way) to record
>> color with the same monochromatic emulsion. I don't know of a process
>> that does both in one image.
>>
>> Jerry
>
> Some image sources (e.g., radar) have underlying data that is
> complex-valued, and the image is generated, typically, by detecting the
> magnitude of the data, sometimes with an emphasis, log, or other
> detection map. Maybe a "complex image" is the underlying data before
> detection?
I wasn't skeptical. Finding new ideas to explore is a big part of the
pleasure I get from hanging out here.
Jerry
--
It matters little to a goat whether it be dedicated to God or consigned
to Azazel. The critical turning was having been chosen to participate.
�����������������������������������������������������������������������
Reply by Eric Jacobsen●March 5, 20102010-03-05
On 3/5/2010 12:35 PM, Jerry Avins wrote:
> glen herrmannsfeldt wrote:
>> Jerry Avins <jya@ieee.org> wrote:
>>> Sylvia wrote:
>>>> I am searching for a robust wavelet based MATLAB toolbox that could
>>>> be used
>>>> for complex images. There are some good toolboxes available however
>>>> they
>>>> can only work for real images.
>>
>>> I know what complex numbers are, but what is a complex image? Can it
>>> be reproduced by printing?
>>
>> I don't know about complex, but there are some cases in optics
>> where phase information is important. If you represent amplitude
>> and phase as a complex number then that would count.
>>
>> Holography, in some sense, stores both the amplitude and phase
>> of the reflected beam, and holograms are difficult to reproduce
>> by intensity based reproduction systems.
>
> I used to make monochrome holograms using high-resolution
> black-and-white photographic plates. Those holograms recorded depth. On
> the other hand. Lippmann photographs used phase (in a way) to record
> color with the same monochromatic emulsion. I don't know of a process
> that does both in one image.
>
> Jerry
Some image sources (e.g., radar) have underlying data that is
complex-valued, and the image is generated, typically, by detecting the
magnitude of the data, sometimes with an emphasis, log, or other
detection map. Maybe a "complex image" is the underlying data before
detection?
--
Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.abineau.com
Reply by Jerry Avins●March 5, 20102010-03-05
glen herrmannsfeldt wrote:
> Jerry Avins <jya@ieee.org> wrote:
>> Sylvia wrote:
>>> I am searching for a robust wavelet based MATLAB toolbox that could be used
>>> for complex images. There are some good toolboxes available however they
>>> can only work for real images.
>
>> I know what complex numbers are, but what is a complex image?
>> Can it be reproduced by printing?
>
> I don't know about complex, but there are some cases in optics
> where phase information is important. If you represent amplitude
> and phase as a complex number then that would count.
>
> Holography, in some sense, stores both the amplitude and phase
> of the reflected beam, and holograms are difficult to reproduce
> by intensity based reproduction systems.
I used to make monochrome holograms using high-resolution
black-and-white photographic plates. Those holograms recorded depth. On
the other hand. Lippmann photographs used phase (in a way) to record
color with the same monochromatic emulsion. I don't know of a process
that does both in one image.
Jerry
--
It matters little to a goat whether it be dedicated to God or consigned
to Azazel. The critical turning was having been chosen to participate.
�����������������������������������������������������������������������
Reply by glen herrmannsfeldt●March 5, 20102010-03-05
Jerry Avins <jya@ieee.org> wrote:
> Sylvia wrote:
>> I am searching for a robust wavelet based MATLAB toolbox that could be used
>> for complex images. There are some good toolboxes available however they
>> can only work for real images.
> I know what complex numbers are, but what is a complex image?
> Can it be reproduced by printing?
I don't know about complex, but there are some cases in optics
where phase information is important. If you represent amplitude
and phase as a complex number then that would count.
Holography, in some sense, stores both the amplitude and phase
of the reflected beam, and holograms are difficult to reproduce
by intensity based reproduction systems.
-- glen
Reply by Sylvia●March 5, 20102010-03-05
The lena image is not complex in a sense its values are all real numbers. I
am not talking about complexity, but about an image whose values are
complex numbers instead of real value intensities.
>On Fri, 05 Mar 2010 11:34:57 -0500, Jerry Avins <jya@ieee.org> wrote:
>
>>Sylvia wrote:
>>> I am searching for a robust wavelet based MATLAB toolbox that could be
used
>>> for complex images. There are some good toolboxes available however
they
>>> can only work for real images.
>>> Thanks
>>> Sylvia
>>
>>I know what complex numbers are, but what is a complex image?
>
>I'm told that the image Lena is pretty complex in that it makes you
>imagine things if you see the non-existant parts.
>--
>Muzaffer Kal
>
>DSPIA INC.
>ASIC/FPGA Design Services
>
>http://www.dspia.com
>
Reply by Muzaffer Kal●March 5, 20102010-03-05
On Fri, 05 Mar 2010 11:34:57 -0500, Jerry Avins <jya@ieee.org> wrote:
>Sylvia wrote:
>> I am searching for a robust wavelet based MATLAB toolbox that could be used
>> for complex images. There are some good toolboxes available however they
>> can only work for real images.
>> Thanks
>> Sylvia
>
>I know what complex numbers are, but what is a complex image?
I'm told that the image Lena is pretty complex in that it makes you
imagine things if you see the non-existant parts.
--
Muzaffer Kal
DSPIA INC.
ASIC/FPGA Design Services
http://www.dspia.com
Reply by Sylvia●March 5, 20102010-03-05
By complex image, i meant image having its values as complex numbers
instead of real numbers. This is possible when I get data not directly in
image domain but in another complex domain (Fourier for example).
>Sylvia wrote:
>> I am searching for a robust wavelet based MATLAB toolbox that could be
used
>> for complex images. There are some good toolboxes available however
they
>> can only work for real images.
>> Thanks
>> Sylvia
>
>I know what complex numbers are, but what is a complex image? Can it be
>reproduced by printing?
>
>Jerry
>--
>Blaise Pascal: Men never do evil so completely and cheerfully
>as when they do it from religious conviction.
>��������������������������������������������������������������
>
Reply by Jerry Avins●March 5, 20102010-03-05
Sylvia wrote:
> I am searching for a robust wavelet based MATLAB toolbox that could be used
> for complex images. There are some good toolboxes available however they
> can only work for real images.
> Thanks
> Sylvia
I know what complex numbers are, but what is a complex image? Can it be
reproduced by printing?
Jerry
--
Blaise Pascal: Men never do evil so completely and cheerfully
as when they do it from religious conviction.
��������������������������������������������������������������
Reply by Sylvia●March 5, 20102010-03-05
I am searching for a robust wavelet based MATLAB toolbox that could be used
for complex images. There are some good toolboxes available however they
can only work for real images.
Thanks
Sylvia