Re: Summed Area Table / Integral Image
- To: mathgroup at smc.vnet.net
- Subject: [mg115413] Re: Summed Area Table / Integral Image
- From: Peter Pein <petsie at dordos.net>
- Date: Mon, 10 Jan 2011 02:39:44 -0500 (EST)
- References: <igbng6$hfs$1@smc.vnet.net>
On 09.01.2011 08:18, Gareth Edwards wrote: > Next newbie question.... > > Suppose I have a 2D matrix, what would be a neat syntax for computed the > 'Integral Image' or summed area table? ( > http://en.wikipedia.org/wiki/Summed_area_table ) > > Many thanks in advance for any neat suggestions. > > Best, > > Gareth > Hi Gareth, if I understand the article correctly, In[1]:= sat[m_]:=Map[Accumulate,m,{0,1}] should do what you want In[2]:= TableForm@sat@ConstantArray[1,{5,3}] Out[2]//TableForm= 1 2 3 2 4 6 3 6 9 4 8 12 5 10 15 Cheers, Peter