topic IMX1 jpeg encoder DCT optimization in Other NXP Products https://community.nxp.com/t5/Other-NXP-Products/IMX1-jpeg-encoder-DCT-optimization/m-p/165978#M970 <HTML><HEAD></HEAD><BODY><P>Hello, I'm trying to optimize libjpeg 6b using DCT of the Multmedia Accelerator integrated in IMX1 chip.</P><P>I use the /dev/dct drive but I have some difficulties to integrate it in the jpeg library. DCT software calculation in jpeg library is different of DCT IMX1 hardware calculation. The compare calculation are incompatible, different range of data ?</P><P>&nbsp;</P><P>Thank you in advance,</P><P>Benoît Degand</P></BODY></HTML> Mon, 23 Mar 2009 17:48:09 GMT bend 2009-03-23T17:48:09Z IMX1 jpeg encoder DCT optimization https://community.nxp.com/t5/Other-NXP-Products/IMX1-jpeg-encoder-DCT-optimization/m-p/165978#M970 <HTML><HEAD></HEAD><BODY><P>Hello, I'm trying to optimize libjpeg 6b using DCT of the Multmedia Accelerator integrated in IMX1 chip.</P><P>I use the /dev/dct drive but I have some difficulties to integrate it in the jpeg library. DCT software calculation in jpeg library is different of DCT IMX1 hardware calculation. The compare calculation are incompatible, different range of data ?</P><P>&nbsp;</P><P>Thank you in advance,</P><P>Benoît Degand</P></BODY></HTML> Mon, 23 Mar 2009 17:48:09 GMT https://community.nxp.com/t5/Other-NXP-Products/IMX1-jpeg-encoder-DCT-optimization/m-p/165978#M970 bend 2009-03-23T17:48:09Z Re: IMX1 jpeg encoder DCT optimization https://community.nxp.com/t5/Other-NXP-Products/IMX1-jpeg-encoder-DCT-optimization/m-p/165979#M971 <HTML><HEAD></HEAD><BODY><P>Well, I succeed in using the IMX1 iDCT computation but the DCT don't give me the expected result.</P><P>&nbsp;</P><P>I'm using this 8x8 matrice sample to test DCT.</P><P><A href="http://fr.wikipedia.org/wiki/Compression_JPEG" target="test_blank">http://fr.wikipedia.org/wiki/Compression_JPEG</A></P><P>&nbsp;</P><P>See you soon for next step, I hope!</P></BODY></HTML> Tue, 31 Mar 2009 21:46:50 GMT https://community.nxp.com/t5/Other-NXP-Products/IMX1-jpeg-encoder-DCT-optimization/m-p/165979#M971 bend 2009-03-31T21:46:50Z