Dear Tom,=20 > I've place a jpeg compressed version of the full untouched frame at: > <www.trbarry.com/Leno=5F1080i.jpg> so you or anyone else can compare and = > play with it better. Be interesting to see what you come up with. I send you back two files:=20 <Leno=5F1080=5F544=5F1080p.jpg> and <Leno=5F1080=5F480=5F1080p.jpg>=20 (attachments deleted for OpenDTV).=20 The first file was generated: 1920x1088 -> 960x544p -> 1920x1088,=20 the second file was generated: 1920x1088 -> 720x480p -> 1920x1088,=20 For the down-sampling I have used an 8-taps transposed polyphase=20 filter (equivalent to a 16-taps impulse response low-pass filter)=20 that has been optimized for low aliasing. It was applied in the=20 linear-light domain, to simulate what an SD (p) camera would do.=20 For the up-sampling I have used a 6-taps polyphase filter (6-taps=20 impulse response low-pass filter) that has been optimized more for=20 high sharpness than for low aliasing. It was applied in the gamma=20 domain, to simulate what a typical receiver would do.=20 There are some errors: the alignment of the output image is not=20 exactly correct with the input image, and there are black bars=20 around the image because I did not bother with filter run-in/out.=20 Those can be fairly easily corrected in the design, but I have=20 never bothered to. (That's why we have overscan, to not bother.)=20 I think that the sharpness loss is more significant than with=20 your example, but the artefacts are milder and this is a true=20 2-step process with real filters with finite bandwidth (slope).=20 So I think that this is a realistic example of what-if (480p).=20 It can be significantly improved by receiver-side sharpness=20 enhancement (=E0 la PixelPlus), but I did not apply that here.=20 I will post this same message, without attachments, on OpenDTV,=20 and will you please put the images on your web-site and post a=20 link to the messages ? Thanks.=20 Best regards,=20 -- Jeroen=20 +-------------------------------+------------------------------------------+ | From: Jeroen H. Stessen | E-mail: Jeroen.Stessen@xxxxxxxxxxx | | Building: SFJ-5.22 Eindhoven | Deptmt.: Philips Applied Technologies | | Phone: ++31.40.2732739 | Visiting & mail address: Glaslaan 2 | | Mobile: ++31.6.44680021 | NL 5616 LW Eindhoven, the Netherlands | | Pager: ++31.6.65133818 | Website: http://www.apptech.philips.com/ = | +-------------------------------+------------------------------------------+ ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.