What will we find in upcoming Samsung flagship phones? Time will tell, however it appears that at this moment in time Samsung can go toe-to-toe with Sony and win. While Samsung hasn't been first to market with new technology elements such as BSI, per-pixel DTI, VTG pixel transistors, or stacked chip, it continues to successfully bring these technologies into mass production. It announced a stacked chip image sensor in February at Mobile World Congress. The Samsung CIS group isn’t stopping there. We also expect to find phase detection autofocus (AF) pixels and will update our teardown when we have more details. For clarity: this is not from the Galaxy S5, but we expect to uncover the same fundamental structures as we dive in to our 16 MP ISOCELL analysis. Below is a cross-section of an 8 MP version of Samsung’s ISOCELL technology showing the F-DTI and VTG. We found both of these technology elements in 2013 from other companies: F-DTI from STMicroelectronics in its HTC ONE UltraPixel camera chip, and VTGs from Sony in a Cyber-shot camera. The salient points include: the successful implementation of front deep trench isolation (F-DTI) and vertical transfer gates (VTG). Samsung described ISOCELL technology in a February webinar and again at Image Sensors 2014, promoting it as the next key image sensor technology after back-illuminated (BSI) sensor technology. Announced in September, 2013 ISOCELL reportedly enables a 30% reduction in crosstalk and 30% increase in full well capacity. Not to be outdone, the Samsung image sensor team developed its ISOCELL technology. This apparent trend continued on to the Galaxy S4 and Note 3, which used the popular 13 MP Sony IMX135 featuring Sony’s stacked chip (Exmor-RS) technology. All the Galaxy S III phones we analyzed used 8 MP Sony camera chips, suggesting the Sony team captured all the business for the third iteration of Samsung’s marquee smartphone. Going back to the Galaxy S II we found back-illuminated Samsung and Sony 8 MP, 1/3.2” optical format CMOS image sensor chips in S II phones from different regions. If last user interaction time > greater than 5mins Then send ajax request to keep session alive.One of the biggest stories of the Galaxy S5 is the new 16 MP, 1/2.6” optical format primary camera module. To avoid numerous ajax calls to the server every time a user moves their mouse you can set the JavaScript to only send an ajax request once every 5 minutes or so. When a user event is fired an ajax request is sent to keep the session alive. For our web app I have developed a JavaScript engine which captures client side user interaction's such as, key down, mouse move, mouse clicks, scrolling etc. If you have to have sessions which expire, focus your efforts on recording user activity better so that sessions do not expire for active users.ĮDIT: E.g. if the user is using the site they should never see it AND if the user is not using the site they will never see it. Therefore warning the user of impending session expiry becomes irrelevant i.e. Logically, if the user is still using the site then their session should not expire. Well, Expiring a session is used to log the user out when they are not using the site/application to secure the data. Ok, so when we have to expire a session should we warn the user and give them the option to extend? That said in some situations such as bank sites we still need to expire sessions as we don't want to leave the door open for anyone to steal our money when we go to the loo or something. In an ideal world the session would never expire, like Facebook, Hotmail etc. The first thing to understand is that users don't care about sessions, the session is something you as a developer are forcing onto the user to meet your security/application needs.
0 Comments
Leave a Reply. |