# Discrete Cosine Transform

Please see attached excel file..Can someone explain to me what frequency information the DCT coefficients give on the input blocks?
Thanks
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Hi oggiemc, you forgot to attach the file, can you try again?
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Author Commented:
sorry!!!
testBlocks.xlsx
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Commented:
Taking your blocks to start at zero (ie 0..7) then

Bi,j = coefficient of cos(pi/8(i+1/2)x)cos(pi/8(j+1/2)y) of F(x,y) as an expansion as a  DCT

Or equivalently

F(x,y) = (1/8)* Sum(i=0,7)Sum(j=0,7)( Bi,j *cos(pi/8(i+1/2)x)*cos(pi/8(j+1/2)y) )
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