=20

brisbanetimes.com.au

Last hurrah for the lost remote

Stephen Hutcheon | = July 19,=20 2007 - 6:28AM

The curse of the missing remote control could become a thing of the = past=20 thanks to a new Australian technology which converts simple hand = gestures into=20 electronic commands that can operate devices such as TVs, video = recorders and=20 set top boxes.

By hooking up a working prototype using the technology to a TV and = VCR,=20 University of Wollongong researchers have operated both machines using a = suite=20 of ten different hand gestures.

A small camera captures an image of the gesture and matches it to a=20 pre-defined command which then instructs the device to do what it is = told.

Displaying, for instance, a closed first, an open palm, a thumbs up = or a=20 "pistol" gesture, users can relay instructions to turn machines on and = off from=20 standby mode, change channels, adjust the volume and play or stop the = video.

The technology is the brainchild of Dr Prashan Premaratne, a lecturer = at the=20 university's School of Electrical, Computer and Telecommunications = Engineering,=20 and his former student, Quang Nguyen.

Dr Premaratne, who has published the findings in the Institution of=20 Engineering and Technology's Computer Vision Research Journal, says the=20 prototype has shown itself to be 100 per cent accurate under normal = lighting=20 conditions and responsive to commands from a distance of 10 metres.

Dr Premaratne says he is currently in talks with Sony Europe about = the=20 process which could also have uses in gaming applications.

He hopes to see the technology included in devices such as a set top = box=20 incorporating a hard disc drive within the next three years and says it = would=20 add less than $50 to the cost of such a unit.

"I'm not really after any money from this invention," Dr Premaratne = says.=20 "It's more the recognition and the additional funding for some of my = other=20 projects that may flow from this."

Dr Premaratne says that while the prototype is based on ten gestures = and=20 operates two devices, more gestures, and hence more functions and = devices, could=20 be added.

Work on the technology has been in progress for two years. It began = as a=20 project with one of Dr Premaratne's students.

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+s_ape(t):'')+s_hav();if(s_lnk||s_eo){var o=3Ds_eo?s_eo:s_lnk;if(!o)=0A= return '';var = p=3Ds_wd.s_g_pageName,w=3D1,t=3Ds_ot(o),n=3Ds_oid(o),x=3Do.s_oidt,=0A= h,l,i,oc;if(s_eo&&o=3D=3Ds_eo){while(o&&!n&&t!=3D'BODY'){o=3Do.parentElem= ent?=0A= o.parentElement:o.parentNode;if(!o)return '';t=3Ds_ot(o);n=3Ds_oid(o);x=3D=0A= o.s_oidt}oc=3Do.onclick?o.onclick.toString():'';if(oc.indexOf("s_gs(")>=3D=0A= 0)return = ''}ta=3Do.target;h=3Do.href?o.href:'';i=3Dh.indexOf('?');h=3Ds_gg(=0A= 'linkLeaveQueryString')||i<0?h:h.substring(0,i);l=3Ds_gg('linkName')?=0A= s_gg('linkName'):s_ln(h);t=3Ds_gg('linkType')?s_gg('linkType'=0A= ).toLowerCase():s_lt(h);if(t&&(h||l))q+=3D'&pe=3Dlnk_'+(t=3D=3D'd'||t=3D=3D= 'e'?=0A= s_ape(t):'o')+(h?'&pev1=3D'+s_ape(h):'')+(l?'&pev2=3D'+s_ape(l):'');else=0A= trk=3D0;if(s_gg('trackInlineStats')){if(!p){p=3Ds_wd.location.href;w=3D0}= p=3D=0A= p?s_fl(p,255):'';t=3Ds_ot(o);i=3Do.sourceIndex;if(s_gg('objectID')){n=3D=0A= s_gg('objectID');x=3D1;i=3D1}if(p&&n&&t)qs=3D'&pid=3D'+s_ape(p)+(w?'&pidt= =3D'+w:=0A= '')+'&oid=3D'+s_ape(n)+(x?'&oidt=3D'+x:'')+'&ot=3D'+s_ape(t)+(i?'&oi=3D'+= i:'')=0A= }s_wd.s_linkName=3Ds_wd.s_linkType=3Ds_wd.s_objectID=3Ds_lnk=3Ds_eo=3D'';= if(=0A= !s_wd.s_disableLegacyVars)s_wd.linkName=3Ds_wd.linkType=3Ds_wd.objectID=3D= ''=0A= }if(!trk&&!qs)return '';var code=3D'';if(un){if(trk&&s_vs(un,sed))code+=3D=0A= s_mr(un,sess,q+(qs?qs:s_rq(un)),ta);s_sq(un,trk?'':qs)}else if(=0A= s_wd.s_unl)for(var unn=3D0;unn=3Dyyyymmdd-hhmm:n|n|n|n... ; e.g. = t_business=3D20050131-1454:5|3|4|0|0|0=0A= // time is user's time of last hit to section. count is number of hits = to section on that day. index 0 is today.=0A= =0A= // ad cookies: s_

=3D[1|0] ; e.g s_business=3D1 . Assumes = false if not present.=0A= =0A= // namespace: bhv_=0A= =0A= // -------------- lib objects=0A= // a tracked section. constructor takes _section_ name and cookie val as = args, splits as appropriate.=0A= // may also be called with just sectName=0A= function TrackedSection(sectName, cookieVal) {=0A= this.sectName =3D sectName;=0A= this.cookieVal =3D cookieVal;=0A= =0A= var match;=0A= if (cookieVal && (match =3D = cookieVal.match(/^(\d{4,})(\d{2,})(\d{2,})-(\d{2,})(\d{2,}):(.*)$/))) {=0A= // parse the val into date / time / count string components=0A= // all date handling is user localtime, 'cept when gmting to = cookie expiries=0A= this.lastHit =3D new Date(match[1], Number(match[2]) - 1, = match[3], match[4], match[5]);=0A= =0A= // split the count string and cast to primitives=0A= var counts =3D match[6].split(/\|/);=0A= var countArray =3D new Array(counts.length);=0A= for (var i =3D 0; i < counts.length; i++) {=0A= countArray[i] =3D Number(counts[i]);=0A= }=0A= this.dayCounts =3D countArray;=0A= }=0A= else {=0A= this.lastHit =3D new Date();=0A= this.dayCounts =3D new Array();=0A= }=0A= =0A= // trim day counts to correct size and zero undefined fields=0A= if (bhv_sectionConfigs[sectName]) {=0A= this.dayCounts.length =3D bhv_sectionConfigs[sectName].numDays;=0A= // $i created above. not scoped per block=0A= for (i =3D 0; i < this.dayCounts.length; i++) { // in does not = enumerate undefined values=0A= if (this.dayCounts[i] =3D=3D=3D undefined) { = this.dayCounts[i] =3D 0; }=0A= }=0A= }=0A= }=0A= =0A= // Sums the contents of the dayCounts array=0A= TrackedSection.prototype.sumCounts =3D function() {=0A= var sum =3D 0;=0A= for (var i =3D 0; i < this.dayCounts.length; i++) {=0A= sum +=3D this.dayCounts[i];=0A= }=0A= return sum;=0A= }=0A= =0A= // given an input date, calculate and return the day counts = appropriately. object method=0A= // expects newDate > lastHit=0A= TrackedSection.prototype.calculateDayCounts =3D function(newDate) {=0A= // get the num of days delta, left pad array with that num zeroes, = then right trim=0A= var oldDays =3D new Date(this.lastHit.getFullYear(), = this.lastHit.getMonth(), this.lastHit.getDate());=0A= var newDays =3D new Date(newDate.getFullYear(), newDate.getMonth(), = newDate.getDate());=0A= var deltaDays =3D Math.floor((newDays.getTime() - oldDays.getTime()) = / (1000 * 60 * 60 * 24));=0A= =0A= var newDayCounts =3D new ArrayClone(this.dayCounts);=0A= for (var i =3D 0; i < deltaDays; i++) {=0A= newDayCounts.unshift(0);=0A= newDayCounts.pop();=0A= }=0A= =0A= return newDayCounts;=0A= }=0A= =0A= // increments the tracked section:- sets the array (via = calculateDayCounts), sets last hits, and increments today=0A= TrackedSection.prototype.increment =3D function() {=0A= var now =3D new Date();=0A= this.dayCounts =3D this.calculateDayCounts(now);=0A= this.lastHit =3D now;=0A= this.dayCounts[0]++;=0A= }=0A= =0A= // serialises the lastHit and dayCounts to match the expected = constructor cookieVal input=0A= TrackedSection.prototype.getStateCookieString =3D function() {=0A= return formatDate(this.lastHit) + ":" + this.dayCounts.join("|");=0A= }=0A= =0A= // saves a tracked section cookie=0A= TrackedSection.prototype.save =3D function() {=0A= // we (arbitrarily) set the expiry date to the number of days we = want to track over + 1=0A= var expiryDate =3D getDateDaysDelta(this.lastHit, = bhv_sectionConfigs[this.sectName].numDays);=0A= var cookieString =3D "t_" + this.sectName + "=3D" + = this.getStateCookieString() + "; expires=3D" + expiryDate.toGMTString() = + "; path=3D/; domain =3D ." + document.domain;=0A= =0A= document.cookie =3D cookieString;=0A= }=0A= =0A= // configure a section to track. constructor also adds to trackSections = hash.=0A= function SectionConfig(sectName, minHits, numDays) {=0A= this.sectName =3D sectName; // name of the section=0A= this.minHits =3D minHits; // min num of hits before setting = targeting cookie=0A= this.numDays =3D numDays; // number of days to watch over=0A= =0A= bhv_sectionConfigs[sectName] =3D this;=0A= }=0A= =0A= // constructs a clone of an array=0A= function ArrayClone(input) {=0A= var clone =3D new Array(input.length);=0A= for (var i =3D 0; i < input.length; i++) {=0A= clone[i] =3D input[i];=0A= }=0A= return clone;=0A= }=0A= =0A= // -----------=0A= =0A= =0A= // configuration. the section name prefix matches any var from the list = below (s_channel, s_prop3, bhv_section).=0A= // multiple sections may trigger at once (top and sub level tracking)=0A= // (although now we do prefix matching, we could really just look at = bhv_full_section)=0A= var bhv_sectionConfigs =3D new Object(); // hash=0A= new SectionConfig("technology", 2, 7); // lc section, hits to trigger, = rolling period (days)=0A= new SectionConfig("business", 2, 7);=0A= new SectionConfig("business_money_superannuation", 1, 30); // from = bhv_full_section=0A= new SectionConfig("travel", 2, 14);=0A= new SectionConfig("drive_interest",1,7);=0A= new SectionConfig("drive_intender",1,7);=0A= new SectionConfig("business_money",1,30);=0A= =0A= var bhv_cookies =3D parseCookies(document.cookie);=0A= =0A= // apply the hit counts=0A= // section variables. we look in both the s_channel and s_prop3 (and = potentially others). could increment more than one at once (if both = parent and parent child are tracked)=0A= // s_channel is like "Travel", s_prop3 is like "Travel/World" -- = actually parent and lowest child, no intermediaries=0A= =0A= var bhv_sectionNames =3D new Array(); // the names of the sections = we will try and apply hit counts to for this one action=0A= var bhv_hitSectionNames =3D new Array(); // sections we've hit. coz we = look in a number of places for sections, might see same setting twice. = don't count twice.=0A= // this is a little clunky, to ensure no error if vars aren't set. can't = put them into an array or will throw exception=0A= // must repeat this idiom for each var to test=0A= // priority orderered first =3D=3D highest=0A= if (typeof bhv_section !=3D "undefined") = bhv_sectionNames.push(bhv_section);=0A= if (typeof bhv_full_section !=3D "undefined") = bhv_sectionNames.push(bhv_full_section);=0A= if (typeof s_channel !=3D "undefined") = bhv_sectionNames.push(s_channel);=0A= =0A= for (var i =3D 0; i < bhv_sectionNames.length; i++) { // iterate through = the vars we check. sc vars=0A= var section =3D bhv_sectionNames[i];=0A= section =3D bhv_normaliseSectionName(section);=0A= // if we haven't seen this section name, and we are configged for = this section, apply the hit count=0A= // go through each configed section, and do a prefix match=0A= for (var sectionConfigName in bhv_sectionConfigs) { // the tracked = sectionConfig name -- it's an assoc. array=0A= if (!bhv_hitSectionNames[sectionConfigName] && = section.indexOf(sectionConfigName) =3D=3D 0) { // if the page's section = starts with the configged name, track it=0A= applyHitCount(sectionConfigName);=0A= //alert("hitting " + sectionConfigName);=0A= bhv_hitSectionNames[sectionConfigName] =3D 1;=0A= }=0A= }=0A= }=0A= =0A= setAdCookies();=0A= =0A= =0A= // given client's cookies, returns a struct: a hash of TrackedSection = objects, keyed by sectName, and a hash of ad cookies=0A= function parseCookies(allCookies) {=0A= var states =3D new Object();=0A= var ads =3D new Object();=0A= var struct =3D new Object();=0A= =0A= var cookies =3D allCookies.split(/\s*;\s*/);=0A= for (var i =3D 0; i < cookies.length; i++) {=0A= var cookie =3D cookies[i].split(/=3D/);=0A= var match =3D cookie[0].match(/^(t|s)_(\w+)/);=0A= if (match !=3D null) {=0A= var type =3D match[1];=0A= var sectName =3D match[2];=0A= if (type =3D=3D "t") {=0A= states[sectName] =3D new TrackedSection(sectName, = cookie[1]);=0A= }=0A= else {=0A= ads[sectName] =3D cookie[1];=0A= }=0A= }=0A= }=0A= struct.states =3D states;=0A= struct.ads =3D ads;=0A= return struct;=0A= }=0A= =0A= // increment the hit count if applicable, and save the new state. Will = create a new TrackedSection if required.=0A= function applyHitCount(currentSection) {=0A= if (currentSection =3D=3D=3D undefined || = bhv_sectionConfigs[currentSection] =3D=3D=3D undefined) { return false; = } // don't track this section=0A= var track;=0A= if (bhv_cookies.states[currentSection] =3D=3D=3D undefined) { // we = need to create it=0A= track =3D new TrackedSection(currentSection);=0A= bhv_cookies.states[currentSection] =3D track;=0A= }=0A= else { // came from cookie=0A= track =3D bhv_cookies.states[currentSection];=0A= }=0A= track.increment();=0A= track.save();=0A= return 1;=0A= }=0A= =0A= // go through the section configs. flip the ad cookies on or off when = required.=0A= function setAdCookies() {=0A= for (var sectName in bhv_sectionConfigs) {=0A= var config =3D bhv_sectionConfigs[sectName];=0A= var track =3D bhv_cookies.states[sectName];=0A= var adCookie =3D bhv_cookies.ads[sectName];=0A= var now =3D new Date();=0A= =0A= if (track) { // user has counts for this section=0A= // calculate the day counts. we don't bother persisting this.=0A= track.dayCounts =3D track.calculateDayCounts(now);=0A= if (track.sumCounts() >=3D = bhv_sectionConfigs[sectName].minHits) { // enough=0A= if (!adCookie || adCookie !=3D "1") { = enableAdCookie(sectName) }=0A= }=0A= else if (adCookie && adCookie =3D=3D "1") { = disableAdCookie(sectName) } // disable as not enough=0A= }=0A= else if (adCookie && adCookie =3D=3D "1") { = disableAdCookie(sectName) } // disable as not tracked=0A= }=0A= }=0A= =0A= function enableAdCookie(sectName) {=0A= var expiryDate =3D getDateDaysDelta(new Date(), = bhv_sectionConfigs[sectName].numDays + 1);=0A= var cookieString =3D "s_" + sectName + "=3D1; expires=3D" + = expiryDate.toGMTString() + "; path=3D/; domain =3D ." + document.domain;=0A= =0A= document.cookie =3D cookieString;=0A= }=0A= =0A= function disableAdCookie(sectName) {=0A= var expiryDate =3D new Date(0);=0A= var cookieString =3D "s_" + sectName + "=3D0; expires=3D" + = expiryDate.toGMTString() + "; path=3D/; domain =3D ." + document.domain;=0A= =0A= document.cookie =3D cookieString;=0A= }=0A= =0A= =0A= // formats a datetime to yyyymmdd-hhmm=0A= function formatDate(date) {=0A= var dateString =3D "" + date.getFullYear() + zeroPad(date.getMonth() = + 1) + zeroPad(date.getDate());=0A= var timeString =3D "" + zeroPad(date.getHours()) + = zeroPad(date.getMinutes());=0A= return dateString + "-" + timeString;=0A= }=0A= =0A= // zero pads a number to 2 sigfigs. always returns a string.=0A= function zeroPad(num) {=0A= return (num < 10) ? "0" + num : "" + num;=0A= }=0A= =0A= // returns a new date that is daysDelta greater then the input data=0A= function getDateDaysDelta(oldDate, daysDelta) {=0A= return new Date( oldDate.getTime() + (1000 * 60 * 60 * 24 * = daysDelta) );=0A= }=0A= =0A= // normalises a section name. from "Travel/World" to "travel_world". = suitable for cookie names et al=0A= function bhv_normaliseSectionName(section) {=0A= section =3D section.toLowerCase();=0A= section =3D section.replace(/\W+/g, "_");=0A= return section;=0A= }=0A= =0A= // place the current version number in a variable, for testing=0A= var bhv_currentVersion =3D "$Revision: 1.13 $";=0A= =0A= =0A= =0A= =0A= ------=_NextPart_000_0000_01C7CA9F.23386DE0--

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