{"action":"opened","issue":{"url":"https://api.github.com/repos/WPO-Foundation/visualmetrics/issues/19","repository_url":"https://api.github.com/repos/WPO-Foundation/visualmetrics","labels_url":"https://api.github.com/repos/WPO-Foundation/visualmetrics/issues/19/labels{/name}","comments_url":"https://api.github.com/repos/WPO-Foundation/visualmetrics/issues/19/comments","events_url":"https://api.github.com/repos/WPO-Foundation/visualmetrics/issues/19/events","html_url":"https://github.com/WPO-Foundation/visualmetrics/issues/19","id":191632579,"number":19,"title":"[Question] If set PSI's initial value to 0 or its ssim value will be better than frame's time?","user":{"login":"MikeLien","id":8307435,"avatar_url":"https://avatars.githubusercontent.com/u/8307435?v=3","gravatar_id":"","url":"https://api.github.com/users/MikeLien","html_url":"https://github.com/MikeLien","followers_url":"https://api.github.com/users/MikeLien/followers","following_url":"https://api.github.com/users/MikeLien/following{/other_user}","gists_url":"https://api.github.com/users/MikeLien/gists{/gist_id}","starred_url":"https://api.github.com/users/MikeLien/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/MikeLien/subscriptions","organizations_url":"https://api.github.com/users/MikeLien/orgs","repos_url":"https://api.github.com/users/MikeLien/repos","events_url":"https://api.github.com/users/MikeLien/events{/privacy}","received_events_url":"https://api.github.com/users/MikeLien/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-11-25T06:24:12Z","updated_at":"2016-11-25T06:24:12Z","closed_at":null,"body":"Hi,\r\n\r\nRecently I work on some performance measurement tasks and leverage your code for SI and PSI calculation on [Hasal project](https://github.com/Mozilla-TWQA/Hasal/blob/master/lib/common/imageTool.py).\r\n\r\nBut we got a little confused why the [PSI Initial Value](https://github.com/WPO-Foundation/visualmetrics/blob/master/visualmetrics.py#L1141) is first frame's time instead of 0 or its ssim value as SI do.\r\n\r\nIf there has any reason to use frame's time as its initial value?\r\n"}}
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