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Cognitive Technophysicist

The intersection of Cognitive Science, Psychophysics, and technology, broadly construed

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Showing posts from October, 2018

Weekly grocery specials for Clairemont Mesa Balboa/Genesee area

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October 15, 2018

Food 4 Less (4995 Shawline St)
Harvest international, on balboa ( 4220 Balboa Ave San Diego, CA 92117 )
Ranch 99 (good parking/limited selection or: amazing selection/horrid parking )
Balboa International market (5905 Balboa Ave)

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Alan Robinson, Cognitive Scientist

Technology enthusiast and visual neuroscientist.

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piLagTesterPro62 input lag59 tv review38 deinterlacing26 pi13 piLagTester6 lcd review5 nas5 4k tv4 upscaling4

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Panasonic TH-42PX75U Plasma TV review: input lag and upscaling tested using the piLagTesterPRO

This 720p Plasma TV from 2008 is very unique and quite nice in many ways. It used to retail for around $1300. If you can find one it's a great choice for retro gaming. Overview/Image quality This is a plasma TV, which generally means at least the following: nearly infinite viewing angles, and jaw dropping weight. That's true in this case as well. This 42" model weights 75lbs. At native resolution (720p) this TV crops 20 pixels off the top/bottom and 30 off the sides. 480p/i crops 20 pixels off all sides. Both modes have aliasing, too, though it's not too bad. There's really no excuse for aliasing on a TV this big: you know the panel was designed specifically to be a tv. Why not hit 720p exactly? And as for 480p/i, they could have at least offered a zoomed out mode with black borders and 1:1 pixel mapping. But no such luck. There are zoom/stretch options to crop even more, but none that crop less. While the native resolution supposedly is 1366 x 768 it does accept

piLagTester PRO order page

September 09, 2021

The piLagTesterPRO measures your monitor's input lag and response time. It is a cheap, full featured add-on to the Raspberry Pi; I provide the sensor and required software, you provide the Pi (a $5 pi Zero is more than sufficient). Although it has a DIY aesthetic, it is quite functional and in fact offers quite a lot more features than the commercial alternatives (Leo Bodnar and the Time Sleuth), and has been tested with over 40 TVs, including 4k models . Here's what it looks like in action: The pi draws a black background, and then roughly once a second displays a set of target rectangles (top/middle/bottom). You place the sensor over the desired target, and the piLagTester measures the monitor's response starting from the moment the frame of video data is sent over the Pi's HDMI port. This is plotted in the graph, which is sideways for space reasons. The lag tester measures two thresholds. In red it shows how long it takes for the monitor to start displaying t

A $5 TV Input Lag tester using a Raspberry Pi Zero

High speed monitors are all the rage now, with quoted response times of 1-4ms. But does that mean that 1-4ms after you make an input (say, jump) you will see that on your screen? No. Often a much bigger issue is Input lag. This is the delay between your computer / game console sending a video frame to your display and your display starting to actually show it, and it ranges from 4ms to 80ms. The problem with measuring input lag is that you can't, at least with everyday hardware. The solution for hardware review sites is to purchase dedicated lag testers such as the leo bodnar tester, timesleuth (both ~$100), or the pi lag tester pro ($40) or use homegrown methods utilizing an oscilloscope ("free" if you already own a $400+ oscilloscope and perhaps a $50k+ engineering degree). Here I introduce a $5 solution (or, "free" if you own the required equipment). What's required: A Raspberry Pi Zero ($5 + S&H from several sources). This single board c

Make your Canon Powershot camera work under Win2k3

Out of the box, the Canon Powershot software is not not compatible with Windows 2003 Server. But with some tweaking, you can make it work. First, you need to install SSDP and UPnP services for Win2k3 . Next, make sure that the old Canon software is uninstalled. Then, set the startup.exe install program on your Canon driver CD to load in WindowsXP compatibility mode. Run setup, and install ZoomBrowser ex, and photo stitch. I've found that version 5.8 does not run well under Win2k3, but that 6.x works fine, so at this point you may need to download and install an updater from Canon's website. After rebooting, plug your camera in. The Canon software may load automatically. I found that I had to first open the Windows Control Panel for Cameras and Scanners and set Camera Window as the default action when my camera was plugged in. After doing this the Canon software would load when I connected the camera, but clicking on the download images button did not work. A final step tha

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