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Re: fitting after rebinning [message #57343]

Thu, 06 December 2007 17:14

Greg Hennessy
Messages: 45
Registered: November 2005

Member

On 2007-12-07, biophys <biophys@gmail.com> wrote:
> Well I do this kinda
> fitting almost everyday with CCD images. If you can imagine each data
> point of the image array as the readout of a CCD array, you will
> understand this almost immediately.

Well, I should have understood it immediately.

> To proper scale the results before and after rebin you just have
> to get rid of the half pixel "offset" and do the scale and add back
> the half pixel back after scaling. e.g.
> 255.5+0.5=(31.5+0.5)*(512/64)=(7.5+.5)*(512/16)

I had been trying to subtract the half pixel, and my math wasn't
working, adding it would have given me the math you showed here.

I really hate dealing with those half pixel offsets.

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[Message index]

		Re: fitting after rebinning By: Greg Hennessy on Thu, 06 December 2007 17:14
		Re: fitting after rebinning By: biophys on Thu, 06 December 2007 16:17
		Re: fitting after rebinning By: Greg Hennessy on Thu, 06 December 2007 14:13
		Re: fitting after rebinning By: David Fanning on Thu, 06 December 2007 13:58
		Re: fitting after rebinning By: Greg Hennessy on Thu, 06 December 2007 13:53
		Re: fitting after rebinning By: David Fanning on Thu, 06 December 2007 13:44
		Re: fitting after rebinning By: Greg Hennessy on Thu, 06 December 2007 13:41
		Re: fitting after rebinning By: Greg Hennessy on Thu, 06 December 2007 13:37
		Re: fitting after rebinning By: Brian Larsen on Thu, 06 December 2007 13:21
		Re: fitting after rebinning By: David Fanning on Thu, 06 December 2007 13:19

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