teaching – Page 2 – dangermouse.net

Another full day of teaching

So, two ethics classes this morning, on the Copying topic. Followed by dropping Scully with my wife for the afternoon and heading into the university to teach at the Image Processing tutorial, while students are working on their final project assessment tasks. The professor is away this week at a JPEG meeting in Berlin, so it was just us tutors handling the students today.

And then back home for two more online ethics classes. In this topic I got an interesting take on copyright questions from one of the kids. She said that whether it’s okay or not to copy someone’s work and make money from it depends on how famous the work/author is. In the sense that it’s more okay if the work is more famous, and less okay if the original is less well known. When I asked her why, she explained that if you copy something well-known, then everyone will know it’s not your own work, and any amount you make off it will be tiny compared to the original creator. Whereas if you copy something relatively unknown, people will be deceived that you made it, and you could make more money than the original creator.

It’s not the direction I thought anyone would go when answering that question, but her logic was sensible and she’d clearly thought about it to try to come up with some reasoning. So I consider this a success!

Scully had another somewhat restless night, but not as bad as the past few. She went in and out a bit, but eventually settled down to sleep for the remainder of the night in our room as usual. So… maybe she’s getting used to whatever the disturbance is? I guess we’ll see tonight. I had a talk to the nearest neighbour who I suspected might be the most likely cause of ay new noise, but they said they haven’t started using any new equipment of any sort recently. Depending how tonight goes, I might have to write and copy a note to stick under the doors of several other apartments to try to locate the source.

New content today:

Hot and busy time passing

Today was very warm, close to 30°C. But I spent most of it inside doing my Monday classes online, ending the topic of “Time Passing”. I started work on planning for the next topic, which is “Copying Things”, covering aspects of copyright, intellectual property, and so on.

The weather tomorrow is set to be much cooler, with a forecast maximum of only 19°C. It may be another day like we had a week or two ago, where the maximum temperature was set at midnight.

In the afternoon I went for a walk with my wife (who was home from work for the Labour Day public holiday) and Scully. And then I made listings on eBay for some more of my 5th edition Dungeons & Dragons books that I don’t want any more. If you’re interested and in Australia, these may be a bargain for you to pick up (if you’re overseas the postage will probably be prohibitive):

My last class tonight started at 9pm, but because of daylight saving starting here it’s an hour earlier for all the students, including one in the USA who had it move from 7am to 6am. He was dedicated enough to get up early for it, but was yawning a bit. All my other classes I made an hour later (for me), to keep them at the same time for the students, but this one I really didn’t want to move to a 10pm start – I’d be turning into a pumpkin before it ended at 11pm. Unfortunately it’s going to get even worse for this kid in November when the US goes off daylight saving, and the class becomes a 5am start for him. I suspect he won’t keep doing it after that.

Finally, a weird thing I noticed taking photos of my D&D books for eBay. I’m using my brand new iPhone 16 and taking photos saved in HEIF format. Some of the photos when I open them in Photoshop, I hit save and it allows me to save them as a JPEG. But some of the photos I hit save and it has a restricted set of save formats available, excluding JPEG. I have to use “Save a copy” to create a copy of the image before I can save it as JPEG. I suspected it might be because the iPhone camera was automatically using HDR mode for some photos and saving them in a higher bit-depth or a different colour space or something, but examining the HEIC files shows no such differences – they’re all 8-bit colour in Display P3 colour space. I examined the EXIF tags of the images and I don’t see any salient differences at all.

So I have no idea why some of these images Photoshop will allow me to save as JPEGs and some it won’t. I tried searching briefly for an answer online, but my search terms couldn’t locate anything relevant.

New content today:

Backwards weather day

Well. I mentioned that yesterday was hot, and the forecast for today was much colder and rainy. They were not kidding.

Today’s maximum temperature in Sydney was 17.8°C. At midnight. It got colder to the dawn, and continued getting colder throughout the morning. Today’s minimum temperature (so far) was recorded at 1pm, at 11.7°C. Since then it’s got a fraction warmer, but is still only hovering either side of 12°C.

And the rain has been steady all day at a moderate rate. We’ve had 32 mm since midnight, and it’s heavier right now, so possibly we’ll reach the forecast amount of 40 mm by midnight.

After teaching two online classes in the morning I finished off writing up the log of our last Dungeons & Dragons session, ready for our next planned one. I took Scully out in the rain for her toilet, and then instead of walking all the way to my wife’s work in the rain I drove over there to drop Scully off, before driving back home and walking to the station here to go into town for today’s lecture at the university.

Today the students began doing project work for their assessment task. The professor didn’t have any coursework lecture, but he gave an informational lecture about JPEG standards development, which he works on as part of the JPEG committee. Then we had a couple of hours of advising the student teams on their project work. I spent most of walking around and talking with the students, answering questions and giving advice on their project plans. It’s a bit more intensive than the usual lecture/tutorial sessions.

Back home I had two more ethics classes this evening, and in the hour in between I made pasta alla norma, with an eggplant and tomato sauce.

The rain should ease tomorrow, but will probably continue through the night.

New content today:

Machine learning classifiers and image processing projects

Today’s university lecture was about machine learning as applied to the field of image recognition. I was there as a tutor assisting the lecturing professor, who went over various details of how machine learning works, different algorithms, and how to measure their various statistical types of performance so you can compare them. In the tutorial part of the session the students got to run various classification algorithms and play with the software tools that we provide.

Several teams also asked me about the end of semester project and reports that they have to do. They’re thinking about what topic they want to investigate and they need to get our approval before beginning, just in case they attempt anything unethical or questionable. (For example, using copyrighted data or taking photos of people without consent.) One group was thinking about using medical scans to detect cancerous tumours, another using automotive camera photos to classify objects on or near roads that cars might need to avoid, another just using a large database of photos of different objects to classify them, and another hoping to read photos of car number plates. These are all kind of standard ideas that many teams often have and are all fine.

Other activities today: Mailing more Magic cards to an eBay buyer. Walking Scully a couple of times. Making spaghetti pesto for dinner.

Oh, and we had some rain while I was coming home from university. It’s the first rain we’ve had since 24 August, 19 days ago, when we just had a trace 0.2 mm. The last time we had serious rain was 17 August. We’ve really been enjoying the lack of rain though, after the last 2.5 years of ridiculous amounts of rainfall.

New content today:

Some photos, some image processing

I mentioned yesterday that the shops next to Maggio’s Italian Cafe in Cammeray were being demolished. I took some photos but didn’t have time to upload them yesterday, so I thought I’d show them today. Here’s a view of the rear of the properties:

This is close to where I sit on a bench while I eat the lunch that I’ve bought from Maggio’s Bakery. There’s a nice shady bench where I can sit and eat while Scully hangs out nearby. So I saw the demolition work in progress while I was eating yesterday. And then when we left, I walked out to the street at the front of the buildings:

Here you can see Maggio’s Cafe (not the Bakery, which is in a separate shop a couple of doors to the left). The yellow facade used to be a small grocery store, and the white one next to it is also being demolished – I forget what sort of shop used to be there. (Google Streetview just helped – up until mid-2022 at least it was a place that did casual art classes, where you learn to paint while sipping wine, and then in early 2024 it became a display suite for new apartments. Possibly apartments which are now about to be built on the site.) It looks like the old brick facade is being kept – you can see it is intact, but all of the building behind, seen through the windows, is gone.

I suspect the plan is to build shops at street level, with a few floors of new residential apartments above. There’s quite a bit of this sort of urban renewal going on around the local suburbs at the moment.

I also took a photo today, at the University of Technology Sydney.

I liked the building shapes here. The left and right buildings are part of the university. The greenery-covered building with the suspended solar reflector is so-called Central Park tower across the road. I don’t quite know how the reflector is supposed to work, since the mirrors are angled downwards.

Okay… I found a website with some engineering information about it! There are also heliostat mirrors on the lower roof level of the adjacent tower, which reflect sunlight up onto the suspended mirrors. Interesting! In fact I think you can see one of the roof-mounted heliostats at the lower right corner of the sky in my photo.

I was at the uni of course for this week’s image processing lecture. The professor talked about machine learning in an image recognition context.

In the evening I made lemon pepper pasta for dinner, using another of the free lemons I got last week.

New content today:

My first second university coursework lecture!

Today I gave my ~~first~~ second lecture of regular coursework for a university course, as I’ve mentioned preparing for over the last few days. The professor had an important meeting and asked me to give the lecture for him. I’ve done “guest lectures” before for this image processing course, during the project work period, on topics that weren’t strictly covered by the course, but this is the ~~first~~ second lecture I’ve done that was actual course material. (Edited after the professor reminded me I in fact did one last year!)

In the morning I did a couple of critical thinking classes. Then I had to get ready for the trip to the university. I would normally leave at 12:30 and walk Scully down to my wife’s work to drop off there and then catch a train in. But I ran out of some ingredients for my usual home lunch fixings (falafels and tortilla wraps), so I decided to walk up to the shops and get some sushi. I didn’t really have time to walk back home again so we went straight from there to my wife’s work and arrived a little early.

After dropping Scully off, I rode on the new Metro train from there in to the university. This train line only opened on Monday, and it’s a significant change from the style of train lines Sydney has always had. Our old train network is heavily interlinked, with many lines diverging and converging, so the train traffic has to be carefully regulated to avoid collisions between trains on different lines merging into one. The Metro is designed on the principle of a single line with no branches or merges, so the trains can run more frequently and faster while still being safe. From my place to Central Station (the closest station to the university) takes 16 minutes on the old line, but only 12 on the new Metro line.

Being a brand new rail line, the stations are gorgeous and clean, with impressive architecture. Here are some photos: Victoria Cross Station.

I arrived in good time for my lecture. It was about image processing operations like binary morphology, cross-correlation, segmentation, and so on. It’s material I know pretty well and the lecture went smoothly. I made sure to try and give context and motivation for every algorithm that I covered, and explain it in simple terms. Afterwards, a couple of students came up and told me they enjoyed the lecture and thought I explained things well. So that was good!

And another Metro photo: Central Station, on the way back home:

Tonight for dinner I made lemon pasta with broccolini, garlic, black pepper, and Parmigiano Reggiano. I used a fresh lemon that I picked up for free from a crate of lemons out the front of someone’s place. Presumably they have a lemon tree out the back and had ridiculous numbers of lemons so wanted to give them away. It was super juicy and the pasta turned out delicious.

I’d use fresh lemons more, but I always feel like paying $1 or whatever for a lemon from a supermarket is bad. It just fells like lemons are a thing that should be free.

New content today:

Ticking off many tasks

I had several things I wanted/needed to get done today. I started making a Darths & Droids comic, from a script we worked on last night (with my friends online), ready for tomorrow’s update. Then I made Irregular Webcomic! strips for tonight and tomorrow.

With those out of the way, I had some tasks to do for photography standards work. I went through the list of currently open ballots for international standards, recommending voting positions for the Australian committee, and emailing the committee members about those.

Then I had to do some mandatory training exercises for the university, so that they will pay me for the lecturing and tutoring work I’m doing. I had four new courses to complete, about data security, fraud, corruption, and remote working. One course said it took 10 minutes to complete, but it had about 5 or 6 videos to watch, each of them three minutes long! It took me 25 minutes to complete that one. The others had more reasonable time estimates. Overall I spent about an hour and a half on them.

I kind of wonder, has anyone in the world ever done a mandatory training course and then failed the quiz at the end so many times that they actually had to resign or be dismissed because they couldn’t complete the mandatory course?

After that I went through the lecture material for tomorrow’s image processing lecture, to make sure I knew all the work and could explain it to the students. I had to refresh myself on the Canny edge detection algorithm, for about the tenth time in my life. But having to lecture about it to students tomorrow will hopefully mean that I never forget the details of the algorithm again!

This evening I had three ethics classes in a row. We’re having fun discussing Sayings. a friend of mine suggested using some foreign sayings and found a good one in Swedish:

Att glida på en räkmacka.

Translated literally into English, this means:

To slide in on a shrimp sandwich.

I told the kids this and then asked them to guess what the saying meant metaphorically. I got some wildly varied answers, including:

To do something dangerous, like sliding on something slippery
To be lucky
To make something delicious
To be lazy, like sliding off your couch
To do something ridiculous

My own guess, before I knew the correct answer was “to make an unwelcome appearance”. But it turns out the real meaning in Swedish metaphor is “to succeed without having to work at it”. This is a really fun topic, at least with kids who get into the spirit of it. I had one class where they were all a bit reserved, and nobody wanted to guess in case they got it wrong.

Oh, my wife got to ride the new Metro train today, from the station near her work to the one near our home. A day before I get to try it to go to the university tomorrow!

And the weather today was absolutely gorgeous! We got up to 26°C. I don’t think this winter has any real cold left in it. It’ll be a touch cooler the next few days, but then next week we’re forecast to have a run of 25°C, 28°C, and 26°C. It was so nice going out today without a jumper or jacket on.

New content today:

A nice day for a lunch out

This morning I finished off my lesson plan for this week’s new critical thinking/ethics topic of “Sayings”. I found some interesting medieval and foreign sayings that modern English speakers aren’t familiar with, to give to the kids to let them try to puzzle them out.

For lunch I drove with Scully over to Two Chaps at Marrickville, where I met my old friend Lisa. We grabbed a table out on the footpath, under a large umbrella to keep the sun off, and had a nice meal. I had the “corned beet” Reuben sandwich, which I’ve had before and really enjoyed. We had a big catch up conversation. She’s started working a part time job—for the first time since raising her kids—doing aged care home visits. She used to be a nurse, so has relevant experience.

After lunch I drove back home, made a comic for tonight’s update, and did the first class with the Sayings topic. Only one student, who was returning after a long break, but it was a lot of fun.

For dinner I made mushroom risotto. I’m just now trying to write some new Darths & Droids material. I need to get a new comic made tomorrow, but I’ll also be busy revising the image processing lecture material to make sure I’m ready to deliver the lecture on Thursday.

The lecture is on image segmentation and image analysis, covering topics such as thresholding, edge detection, pixel morphology operations (erosion, dilation, skeletonisation, etc), geometric property measurement, and convolution and cross-correlation. Should be a fun lecture! (This is serious, not sarcastic, in case that wasn’t obvious. 😀)

New content today:

Image processing lecture 2

Today was busy, with two online ethics classes for kids in the morning, then a short break before heading into the city for this afternoon’s university lecture on image processing. It’s a really big class this year and as I was walking around to help students during the tutorial exercises I noticed some tables sized for 6 people had 8 or 9 people squashed in around them, and there was not much room between all the people to squeeze between the tables.

The lecture used the full three hour time slot and I got home with less than half an hour to spare before my next ethics class. I had a quick snack, some brie and crackers, before the class. After that I made some actual dinner – ramen noodles with broccoli and sesame sauce. And had a shower and then it was another ethics class!

And that was pretty much the day.

New content today:

Start of a new Image Processing semester

Today I went into the university to begin my work of tutoring for the new semester of the image processing course that my associate runs. This year the class runs from 2pm to 5pm on Thursdays, a welcome change from last year when it ran 6-9pm (on Tuesdays). And the class is huge, close to 300 students! We’re in a big lecture room and it was very full.

The first lecture is an introductory overview of image processing, and context for why it’s useful and what it’s used for, plus some administrative stuff about the course content and assessment, and a demonstration of Matlab, the software we use for teaching the practical components. It ended a bit early, but there were dozens of students waiting around afterwards to ask the professor questions. Some of them came over to ask me instead, since I’d introduced myself as a tutor early in the lecture. The most inevitable question is people asking if they can change their assigned project team group to be on a team with their friends. We always tell them no, the groups are assigned randomly to give them experience at working with strangers, which is important for future employment, and nobody can change teams. Some of them really don’t want to hear that answer!

I made it home with plenty of time for my evening ethics classes. I had to do a tough thing today and write a message to a parent telling them I can’t teach their kid any more. The kid is outside the listed age range of the class by 2 years, on the young side. Although the kid (I’m not going to use a gender-revealing pronoun) is very smart and able to converse on the topics, the kid is really not mature enough to engage in a group discussion without constantly interrupting and not letting anyone else get a word in, either me or the other students. I gave this kid two weeks and that was enough. I was almost tearing my hair out by the end of the second class, and decided I just couldn’t cope with it any more. The kid was also extremely pedantic and not willing to engage with the premises of the questions as intended.

For example, in this week’s topic on Shapeshifters I asked: “If everyone could turn into animals, would that be good or bad?”

The kid replied with, “People can’t turn into animals.”

When I pressed and said, “Yes, but imagine if we could. Would it be good or bad?”

And the kid responded, “People don’t need to turn into animals. We’re superior.” And this is just one example – there were several other questions where I couldn’t get a straight, non-pedantic answer that took the question in the intended spirit.

Maybe the kid is neurodivergent, but I didn’t honestly get that impression more than just a lack of maturity. I have other kids I know are neurodivergent and I can handle them fine, but this kid was just too much for me. I felt it was better for both of us that this kid not take my classes any more, at least for another year or two. I’ve never had a problem kid like this before.

Also today I mailed off another package of Magic: the Gathering cards. Nearly 1000 cards from the Fallen Empires set. Most of these cards are worth almost nothing on the secondary market, so I was glad someone wanted to buy a bulk lot of them and I can get them off my hands.

New content today: