[M4IF Technotes] IDCT scaling (down & up) by non-power two

[Rob Koenen]

Moses,
this list is for questions about MPEG-4.
For JPEG releated issues, please see www.jpeg.org
Best,
Rob
> -----Original Message-----
> From: moses   kampsax.dtu.dk [mailto:moses   kampsax.dtu.dk]
> Sent: Wednesday, February 20, 2024 7:22
> To: technotes   lists.m4if.org
> Subject: [M4IF Technotes] IDCT scaling (down & up) by non-power two
> 
> 
> Hi all 
> I'm new for the IDCT JPEg still image. I'm using the IJG library to 
> implement arbitrary scaling an JPEG still image. IJG has only 
> the power of 
> 2 scaling decoder methods. 
> 
> 1. which is algorithm the fast one for this problem? 
> 2. Do you have any example of it or where to find (link)? 
> 3. Is it used by the MPEG-2 or 4? 
>  
> 
> I will appreciate if you could help with these problems. 
> 
> I'm looking forward to have your help. 
> 
> Best regards 
> Moses
> 
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