topic Re: Reducing bit depth in Intel® Integrated Performance Primitives

Reducing bit depth

Deleted_U_Intel — Tue, 06 Apr 2004 16:17:46 GMT

Hi all

There is new function in IPP40 - ippiConvert_8u1u_C1R.
I'd like ask what is threshold level for Stucki's dithering(and its scope). Also i'm afraid i can't understand by the proper way what should i put in place - Offset (in bits) in the first byte of the source image row.

Thanks,
Adi

Re: Reducing bit depth

Intel_C_Intel — Tue, 06 Apr 2004 18:13:06 GMT

Hi, Adi

Did you read the IPPI Developers Manual? Please take a look on Chapter 4, Image Data Exchange Functions for details about bit offset and Stucki's dithering. And, come back if youwill have questions:)

Regards,
Vladimir

Re: Reducing bit depth

Intel_C_Intel — Thu, 15 Apr 2004 14:04:30 GMT

Adi,

Stucki's error diffusionalgorithm implemented in IPP was done according the book, Stuckie, P 1981 "MECCA - a multiple-error correcting computation algorithm for bilevel image hardcopy rereproduction", Research Report RZ1060, IBM Research Laboratory, Zurich, Switcherland

The error filter is rectangular grid with weights as below

x 8 4

2 4 8 4 2 / 42

1 2 4 2 1

Regards,
Vladimir