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Re: Histogram Hot-shots Required [message #16341 is a reply to message #16297]

Tue, 20 July 1999 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Martin Downing wrote:
> Liam Gumley <Liam.Gumley@ssec.wisc.edu> wrote in message
> news:378F33E4.984726C5@ssec.wisc.edu...
>> Assuming I know the minimum and maximum values (the range) used in
>> creating the histogram, the histogram binsize, and the number of bins,
>> the zero-based bin index is given by
>>
>> bin_index = long(float(pixel_value - histogram_min_value) /
>> float(binsize))
>>
>> and then to protect against pixel values LT histogram minimum value, or
>> GE histogram maximum value
>>
>> bin_index = (bin_index > 0L) < (number_of_bins - 1L)
>>
>
> I agree with the first part, but HISTOGRAM ignores values outside the
> specified range, so you would want to check the index and throw away if LT 0
> or GE "num_bins"

which is done by the the statement

bin_index = (bin_index > 0L) < (number_of_bins - 1L)

Cheers,
Liam.

--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		Histogram Hot-shots Required By: davidf on Thu, 15 July 1999 00:00
		Re: Histogram Hot-shots Required By: Liam Gumley on Tue, 20 July 1999 00:00
		Re: Histogram Hot-shots Required By: Martin Downing on Tue, 20 July 1999 00:00
		There is NO TRUTH! Re: Histogram Hot-shots Required By: davidf on Mon, 19 July 1999 00:00
		Re: There is NO TRUTH! Re: Histogram Hot-shots Required By: davidf on Wed, 21 July 1999 00:00
		Re: There is NO TRUTH! Re: Histogram Hot-shots Required By: gabriel rodriguez ibe on Wed, 21 July 1999 00:00
		Re: Histogram Hot-shots Required By: davidf on Mon, 19 July 1999 00:00
		Re: Histogram Hot-shots Required By: eddie haskell on Fri, 16 July 1999 00:00

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