[SciPy-User] Image with black points

[Paulo Henrique Junqueira Amorim]

Hi Bruno,

Yeah Bruno, how could only one of them?

Thx,
Paulo


On 26 April 2011 23:10, Bruno George <bgeorge98121 at gmail.com> wrote:

> Hi,
> You know the two images are mirroring (flopped) to each other?
>
> Bruno George
>
>
> On Mon, Apr 25, 2011 at 10:15 AM, Zachary Pincus <zachary.pincus at yale.edu>wrote:
>
>> On Apr 24, 2011, at 10:22 PM, Paulo Henrique Junqueira Amorim wrote:
>>
>> > Hi,
>> >
>> > I'm computing the 1D fft from image, and saving the image of
>> > frequency.
>> >
>> > But the saved image appears black point's (example image), it seems
>> > that do not belong.
>> >
>> > Is this correct? How could I remove it?
>> >
>> > Example image - http://img818.imageshack.us/i/fftthreshold.png/
>> >
>> > Code:
>> >
>> > import scipy
>> > import numpy
>> >
>> > r = scipy.misc.pilutil.imread('face.jpg', 'F')
>> >
>> > fft = numpy.fft.fftshift(numpy.fft.fft(r).real)
>> > fft_2d = numpy.log10(numpy.abs(fft))
>> > pil_array = scipy.misc.pilutil.toimage(fft_2d)
>> >
>> > scipy.misc.pilutil.imsave('fft.tif', pil_array)
>> >
>>
>> If you could provide the input image that would be helpful for people
>> trying to determine what the issue is.
>>
>> As a stab in the dark -- have you checked (from python) what the
>> values of at the "black points" are? Are they NaNs? (Perhaps from the
>> log10 operation?)
>>
>> Zach
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>
>
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