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</o:shapelayout></xml><![endif]--></head><body lang=ES link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear Competitor and other people involved in the competition,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Regarding the two concerns expressed by Dante and Stefan the situation is the following:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Stefan, about starting and stopping timestamp (so, synchronization):<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Stefan detected for his system that a delay of 50 seconds in the timestamp improves a lot the total calculation of accuracy.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>We could verify, without changing the code of the evaluation application that this is true.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>We have two ways to calculate the first sample, so the TIMESTAMP-START of each competitor. And both ways should provide the same value (you can check at the excel file all this calculations):<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>The first is: Timestamp of evAAL PC when the experiment finishes – (duration of the experiment) = Timestamp of evAAL PC for the START + (difference of Times between evAAL PC and Competitor PC) = TimeStamp START of the Competitor’s clock -> TIMESTAMP-START.<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>The second: We go to the video server and collect the timestamp of the moment when Francesco Portot́ starts (human perception), then we apply a fixed offset between video server and evAAL PC = TimeStamp of evAAL PC for the START. Then we follow the last two steps of the previous method, and we got TIMESTAMP-START 2. <o:p></o:p></span></p><p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>The two way calculation, TIMESTAMP-START and TIMESTAMP-START2, provide the same number aprox., but no difference of 50 seconds, just 1 or half a second (because of human perception in the second method).<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Therefore, for us it is mystery why 50 delay is introduced considering the information that we have.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Then we started a process to try to find out what is happening and we did the following actions:<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Let’s assume that this 50 sec delay affects every competitor (This is not something that we can demonstrate but we made that assumption).<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Based on that assumption apply 50 seconds delay in all timestamps for all competitors.<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>The results were: Dramatic improvement for 3 out of 4 competitors.<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>The next question is then: why 50s and not 35, 37, 40? And why this delay should be the same for all? And why for all tests? <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Then we continued exploring:<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>We decided to make some tests: take competitors and calculate the scores with 30,31,32… 68, 69, 70 seconds of delay (+/- 20 considering 50sec as a reference) and see if for all of them there is a maximum at 50s.<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:Wingdings'><span style='mso-list:Ignore'>§<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US> If this is true, somehow we can conclude that there is an offset of 50s for all of them.<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:Wingdings'><span style='mso-list:Ignore'>§<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>If this is not true and the different competitors experience a maximum in different times, to be honest, the Steering Committee should meet and reach a consensus on how to proceed.<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>The experiments said it is not true, but SIMILAR, which means that given one competitor we can find a maximum value for First Experiment in Path 1 and find a maximum value for Second Experiment in Path 1, but the difference is around 1-2 seconds if not in the same. But it changes from experiment to experiment and from competitor to competitor. However, most of them are in the surroundings of 50s (except for path 3 which is the surroundings of 40sec).<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b><span lang=EN-US>Our suggestion is that we take the initial timestamp that provides the Maximum score for each competitor, and take this score as the final one to be computed.<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Dante about random repetition of lines at the input file:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>In order to avoid any problem we are going to create a simple program that removes repeated lines, in order to get a new Samples file for all the competitors, and do the calculations using these new files. <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>We’ve made a test and some changes were observed though, as expected, the improvement is not sensible (a change of +/- 0,5 in scores with 10 as a maximum). However, 0,5 points can be ciritical, and we decided to eliminate any doubt and simply remove repeated lines.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Please, consider the samples and excel file sent by Stefano Chessa this week as an old version. We’ll try to provide an updated version considering the actions described by the end of business day today.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>We hope this satisfies everybody, because competitors will have the opportunity to bright as they deserve. </span><span lang=EN-US style='font-family:Wingdings'>J</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Juan Pablo and Angel on behalf of evAAL Steeting Committee.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>