Question about DCT

[Flying_Doc]

i have a question about DCT..actually it's sound like silly question but it's important for me.. The question is: 1. Why on DCT the function use a cosine function, if we see on the image and the function there is no connection with angle. 2. Why the function using cosine, why not using sine or tangen? what is the influence for the compression ratio?. 3. Is it true that we using the pixel depth for making 8x8 matix as the input for DCT, if it's true how to get a pixel depth on image in C# so we could make the 8x8 matrix. thanks.. God bless you

[Luc Pattyn]

Hi, with a general question like that, you should do some research first. Here[^] is something worth reading. 1. because it works well 2. sine could be used equally well, tangent would be harder to use due to it frequently becoming infinite 3. No :)

Luc Pattyn [Forum Guidelines] [My Articles]

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