Sunday, July 22. 2012
1. I walked to this parking machine and started throwing money in without looking at it as the price was on the board beside it.
2. When I finished putting in £5 in change (15 coins) I realized that I had to put in the licence plate number first.
3. Because I don't know my number I had to walk back to the car and memorize it on my way back.
4. I came back to the machine, put the number in, put the money in .... and pressed the wrong grey button (there are 39 grey buttons :)) ....
Why would they want people to put the licence plates numbers in? The first idea that crossed my mind was to prevent users to give one another the parking tickets. With the # on it it's risky to do it. But this seemed stupid. My second thought was that whoever owns the parking place wants to be sure that each car pays the right amount and that there's no cheating. And I was right. There's a camera at the entrance. I'm not sure if it is directly connected to the parking machine. But they allow users to stay over the time they paid for. But before they leave they need to pay for additional time. The camera then records the exit time and the system knows if the car "owns" more money (probably sending the fine over mail).
I'm sure there are other ways of doing this. But let's assume that the designers wanted the users to feel less restricted. There are no ramps and everyone is free to come an leave without restrictions. I'd believe that if there weren't gazillions of signs "have you paid and displayed".
But let's look at the interface itself which certainly has some flaws
- The machine does not allow different order of steps (e.g. money first).
- The keyboard has different layout than e.g. standard QUERTY which is known by a lot of people.
- The keyboard key labels are hard to see when standing by the machine because the buttons are covering the labels on the row below (I had to bend to see the labels and I'm only 174cm or 5.9).
- The grey button (see step 3 on the machine) should be of a different colour e.g. green to differentiate it from the rest
- The buttons should be labelled (I still don't know what the red one is for as for cancelling the transaction one needs to press the grey button below the coins' slot).
- There is no slot for banknotes and it's hard to imagine that one has £28 in change for a weekly ticket. I barely scratched £5 myself. If I wouldn't, I'd have to walk and spend cca. 15 minutes to get to the shop, change the money and return and pay. Of course there's pay by phone, but I'm on pay as you go and I had less than £5 on.
I wonder if there were any logical designing decisions behind this design I can't see any and so did not a few people paying right after me. They all complained.
Saturday, July 14. 2012
I made a video of how to emphasize (add a circle over a face) things in a video with Avidemux. The same can be done for adding a blur with a different filter - Mplayer delogo.
However, blurring just one part of the video with the Mplayer delogo filter once failed on me. I wanted to add a blur just for five seconds over a face in a longer video. If I didn't specify the frames (Partial button in step 5 of the previous tutorial) I got the blur over the whole length of the video. With Partial selected I ended up with a destroyed video.
Let say I want to add a blur from the frame 500 to the frame 600 on a video of 1000 frames.
1. Split the video in 3 parts
Use the reddish buttons A & B at the bottom of the video to select UNDESIRED parts of it and use Edit->Delete to cut bits of the video out. Save each part as it's own file (no encoding needed so both video and audio remain on Copy) so we end up with 3 files: first from frame 0-499, second from frame 500-600 and third from frame 601-100.
2. Add a blur to the second video file
Use the procedure of the previous tutorial but select Mplayer delogo as a filter (and don't forget to encode the video).
3. Concatenate the three videos.
Open the first one and select File->Append to add the other two in the right order
Here's the video (sorry I forgot to turn the mic on but it's short and self explanatory).