applet - performance concerns in using Java Advanced Imaging APIs -

-

in our project use jai showing parts of image, rotating image , basic zooming in applet. observe applet takes lot of time load - around 20 seconds first time. subsequently, takes 3 seconds (which quite high).

jai development seems have frozen since 2007.atleast not find download post 2007 on java website.

has encountered loading issues , solved them in context of jai ? there performant alternative jai ? images using in tiff format , can have multiple images in 1 physical file.

any pointers appreciated.

the first application startup (cold startup) require lot of time, need load tons of libraries including jai. second , next application startups (warm startup) faster runtime classes cached in classes.jsa.

then, image processing require cpu , in order paint it, graphics card. modern computers image processing (basic operations!) , handling (zoom, pan) trivial , fast jai.

we have developed , image reviewing application jai + image i/o , zoom , panning extremely fast since finished in 2007 (1mp images). after image loaded, processing , handling fast, load image in background threads improve user experience.

the problem jai current state: frozen and/or dead, mature, quite stable , other products apache log4j have same issue, no new developments since years, people continue using there no alternative (well, logback!).

the plenty of alternatives jai, imagemagick, didn't test them.

we careful when loading , processing images, convert 8bit/channel if possible, perform operations in background before painting...


Comments

Post a Comment

Popular posts from this blog

android - Spacing between the stars of a rating bar? -

-
ho can set spacing beween stars? thats ratingbar: ratingbar = (ratingbar) inflater.inflate(r.layout.ratingbar, null); ratingbar.setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content)); the layout: <?xml version="1.0" encoding="utf-8"?> <ratingbar xmlns:android="http://schemas.android.com/apk/res/android" style="@style/mystyle" android:layout_alignparentright="true" android:layout_height="19dp" android:layout_width="wrap_content" android:numstars="5"> </ratingbar> the style: <style name="mystyle" parent="@android:style/widget.ratingbar"> <item name="android:progressdrawable">@drawable/android_r2_ratingstar_yellow</item> <item name="android:indeterminatedrawable">@drawable/android_r2_ratingstar_grey</item> </style> thanks, cheers you have
Read more

html - Instapaper-like algorithm -

-
does of algorithm extracts contents webpage? instapaper ? there 2 steps instapaper does: find main content block on page (excluding headers, footers, menus etc) from content block extract , format text to find content block (typically html block element, div containing key page text content) instapaper uses algorithm 1 used readability . can @ source of readability.js see what's going on, @ core tries find area on page highest text/link ratio, although has other simple scoring metrics (e.g. off top of head, things ratio of text commas, para elements etc) go heuristics. once have identified root node element, relevant content, you'll need format it, if want can pull node element containing text out of source document , insert yours, in reality you'll want remove existing styles , apply own, standard , feel. if want output nice text-only can use jericho's renderer . update1 : should mention else instapaper - follow 'pagination' links (
Read more

c# - How to execute a particular part of code asynchronously in a class -

-
i creating speech recognition engine that's going respond user commands.i have created button enable , disable speech recognition per user convenience.i have used dispose() of speech engine disable speech recoginition.here code private void button1_click(object sender, routedeventargs e) { engineon = !engineon; if (engineon) { speechengine = speech.createspeechengine(); //speech class creates , returns new speech engine. speechengine.audiolevelupdated += new eventhandler<audiolevelupdatedeventargs>(speechengine_audiolevelupdated); // use system's default microphone speechengine.setinputtodefaultaudiodevice(); speechengine.loadgrammar(new dictationgrammar()); // start listening speechengine.recognizeasync(recognizemode.multiple); } else { speechclass.myengine.dispose(); } } but disposal of speech obj
Read more