Comments on: Cocoa and Objective C http://www.maven.de/2006/02/cocoa-and-objective-c/ --- still in migration --- Mon, 31 Oct 2011 02:31:42 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Kabenla Armah http://www.maven.de/2006/02/cocoa-and-objective-c/comment-page-1/#comment-189673 Kabenla Armah Wed, 17 Nov 2010 15:57:11 +0000 http://www.maven.de/?p=695#comment-189673 I have just started using xcode/objective-c and I wanted to know why it is not possible to drag an NSOpenpanel into my application in the interface builder, and access it through IBOutlet system (in the same way that you can with NSTextField). I have just started using xcode/objective-c and I wanted to know why it is not possible to drag an NSOpenpanel into my application in the interface builder, and access it through IBOutlet system (in the same way that you can with NSTextField).

]]> By: apexo http://www.maven.de/2006/02/cocoa-and-objective-c/comment-page-1/#comment-21518 apexo Mon, 03 Apr 2006 07:55:46 +0000 http://www.maven.de/?p=695#comment-21518 very funny indeed. you modified your rice-coding backend in quite the same way i did 3 years ago (like caching the refinement bits to simplify the decoder) even tried to exchange the backend with something different (like an adaptive huffman encoder which huffman-encodes the exponent or a fibonacci-coder) ... well; none of those were superior to the rice-coder for the given workload; wonder how many different coding backends you tried before chosing rice ... nevertheless I still have something different to try out. maybe this evening ... very funny indeed. you modified your rice-coding backend in quite the same way i did 3 years ago (like caching the refinement bits to simplify the decoder)

even tried to exchange the backend with something different (like an adaptive huffman encoder which huffman-encodes the exponent or a fibonacci-coder) … well; none of those were superior to the rice-coder for the given workload; wonder how many different coding backends you tried before chosing rice …

nevertheless I still have something different to try out. maybe this evening …

]]> By: apexo http://www.maven.de/2006/02/cocoa-and-objective-c/comment-page-1/#comment-21513 apexo Sat, 01 Apr 2006 13:33:18 +0000 http://www.maven.de/?p=695#comment-21513 sounds promising; seems like I gotta take a closer look at the new sources ... still leaves me with the non-trivial problem of how to distribute bits across tiles ... well, got that solved then, think I'll manage to do it now somehow ... sounds promising; seems like I gotta take a closer look at the new sources … still leaves me with the non-trivial problem of how to distribute bits across tiles … well, got that solved then, think I’ll manage to do it now somehow …

]]> By: [maven] http://www.maven.de/2006/02/cocoa-and-objective-c/comment-page-1/#comment-21512 [maven] Sat, 01 Apr 2006 11:02:04 +0000 http://www.maven.de/?p=695#comment-21512 Well, I've changed a lot in the code since then, and although it still uses the same Rice-coding back-end, it is now much closes to SPIHT as it also produces an in some sense (and under some restrictions) optimal embedded bitstream, but with somehwat simpler code. Now there is no quantizer-selection as such anymore, the encoded channel is simply truncated at the desired quality, which has improved the speed for target quality and target size modes considerably. You can find the current version (with documentation) <a href="http://www.maven.de/code/wavelet/" rel="nofollow">here</a>. Well, I’ve changed a lot in the code since then, and although it still uses the same Rice-coding back-end, it is now much closes to SPIHT as it also produces an in some sense (and under some restrictions) optimal embedded bitstream, but with somehwat simpler code.
Now there is no quantizer-selection as such anymore, the encoded channel is simply truncated at the desired quality, which has improved the speed for target quality and target size modes considerably.
You can find the current version (with documentation) here.

]]> By: apexo http://www.maven.de/2006/02/cocoa-and-objective-c/comment-page-1/#comment-21508 apexo Fri, 31 Mar 2006 12:55:06 +0000 http://www.maven.de/?p=695#comment-21508 about three years ago I did some experiments with your wavelet code; result was a tile-based video-codec which used wavelets for spatial as well as temporal compression and your rice-coding backend; I gave then up since at that time DivX seems superior (although not by much) to my attempts (and since my approach was a whole lot slower) now I came back to that idea and stumbled across some new things like SPIHT (http://en.wikipedia.org/wiki/SPIHT), wonder whether you already did experiments with SPIHT or if I should try my luck there about three years ago I did some experiments with your wavelet code; result was a tile-based video-codec which used wavelets for spatial as well as temporal compression and your rice-coding backend; I gave then up since at that time DivX seems superior (although not by much) to my attempts (and since my approach was a whole lot slower)

now I came back to that idea and stumbled across some new things like SPIHT (http://en.wikipedia.org/wiki/SPIHT), wonder whether you already did experiments with SPIHT or if I should try my luck there

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