The L16 camera is the latest consumer-accessible version of a scientific imaging technique called computational photography. Now to some extent, all digital photography is computational photography. For example, all CMOS sensors that use a Bayer color filter require computational models to interpolate what the color values are in each of the pixels that they capture.
But what the L16 does is much more complicated. Instead of a recording the photons collected and focused by a single lens, it has 16 sensors and 16 lenses. There are some significant advantages to this. First of all, the total surface area of the sensor array can be increased by adding more small lenses, instead of increasing the size and weight of a single big lens.
This is not a new idea, in fact this is exactly how an insect’s compound eye works: many tiny lenses capture many images that the insect’s brain instantly comprehends as one image. The L16 does this a bit slower, taking the data from 16 different sensors and 16 different lenses, and assembling it into a single image that should have greater detail, less noise, and some additional data that a single sensor could not have captured on its own.
In many ways, Britain’s national history began when it left the Roman Empire. Throughout its many centuries, Britons have defined themselves as freedom-loving, independent people, very often resisting larger multi-national organizations or top-heavy systems of government. To choose just a few examples, King Alfred led his countrymen out of an encroaching Viking nation, Henry VIII removed his country from an increasingly tyrannical Roman Catholic Empire, William Wilberforce extracted Britain from the global slave trade, and Winston Churchill rallied his people to repel the ever-increasing Third Reich and then to beat it back from the lands it had swallowed up.
Despite this rich tapestry of freedom, I was a little surprised to watch as Britain voted itself out of the European Union yesterday. I’d seen so much fear and panic in the media, and so many English celebrities moping about how much costlier their vacations would be if the tiny UK left the utopic pantheon of European powers, that I wasn’t really sure if modern Britons would follow their ancestral heritage. Fortunately, they did… just barely.
As we watched the results being reported last night, the financial markets went wild. When it became apparent that little old Britain was probably going to paddle off alone into the Atlantic after all, the Pound dropped like a rock as investors swapped them out for safer currencies, like American Dollars, Yen, or gold. But despite deep pessimism about the UK’s future without the all-powerful EU, nobody was buying up Euros.
We had an unexpected visitor last night. Well, I should say that it was not expected by Heidi. Heidi is from Colorado, so she is often surprised to find bugs in our house. I have been living in Tennessee for long enough that I am more surprised when there are not bugs in our house.
We were on our way to bed after putting James down for the night, and found a large beetle flying around in our room. It was a pretty large beetle to be airborne, and demonstrated very accurate navigation, even in the dark. When it landed on the floor I noticed something very strange about it – it seemed to carrying a colony of tiny spiders that were swarming all over its head and body.
Because I am not an entomologist, I was just slightly grossed out. Also, when I pointed a flashlight at the beetle it flipped itself onto its back, and I noticed that its abdomen was emitting what real entomologists call “a foul-smelling fluid.” I quickly used a piece of paper to flick the dying beetle out our bedroom door, assuming that he had been unfortunate enough to be killed by a bloodthirsty mob of baby spiders… but that made no sense.
How could so many spiders have jumped a big, fast-moving beetle, and how could they have gotten through his thick plate armor so quickly? He seemed to have gone from precision flying to apparent death very suddenly, even suspiciously suddenly. It slowly dawned on me that I had just been outwitted by a bug playing possum, so I Googled “mites on beetle” and discovered something fascinating.
Last month, someone asked us if we were planning to educate James at home. There’s a lot of reasons why the answer is yes; mostly related to Biblical obedience. Heidi and I believe very strongly that it is our own personal responsibility to raise our children in the nurture and admonition of the Lord. Even if our current public school curriculum wasn’t fundamentally opposed to these things (and co-ed bathrooms are the least of our concerns, by the way), institutional education systems don’t leave the time or opportunities for us to set the examples for our children that we see Scripture describing for us, the parents.
But it goes beyond that. We’re not seeing home education as a burden we carry until our country’s messed-up schooling system gets fixed, and we’re not approaching it like a daily cross to bear (not until we get to Algebra, anyhow), but as a blessing! We may be a little nervous about our own personal abilities to teach, since this is our first time to do this, but we are genuinely excited about this. Why is that?
The best, clearest, most concise answer to that is simply that we were educated at home. I realize that lots of other homeschooled kids have rejected homeschooling, that not everyone who experienced homeschooling has the best attitude about it, and that we all had different parents and experienced a different process of homeschooling. And yet, there is no better way to explain why Heidi and I are just plain excited to teach our children at home than simply to explain that we have experienced it ourselves.
Our parents taught us to love God’s Word and God’s ways, and we want to do the same for our children. But it goes beyond that. We want to teach our children at home because we loved being with our parents and siblings growing up, and we want to allow our children to have that same wonderful experience. We’re excited about providing that experience to them and being a part of it with them.
I’m used to travelling with with a lot of camera equipment. I like having a kit of several lenses, some audio recording equipment, and at least one backup camera, just in case. However, now that Heidi and James are with me, and James requires a pretty sizable collection of accessories, support equipment, and backup clothing just of his own, I tend to carry a lot less production gear. Of course, if I’m travelling for work, I generally have a bag or two like this one, but on our last family trip, all I brought was an H2 recorder and a tiny point-and-shoot camera.
Of course, I still wanted to take along spare batteries and an extra memory card. The problem was that I didn’t really want to throw all this extra stuff in my pockets along with my phone, wallet, knife, and then James’ toys, pacifier, teething gel, extra socks, discarded shoes, bits of windscreen that he has chewed off of the H2, etc. And so to make all the camera gear fit into a single, easily grabbable item, Heidi made these nifty pockets for the neck strap. Each pocket is simply a loop of 3″ elastic threaded onto the strap, sewed shut on the bottom, and then sewed partly shut on the top. That little bit of stitching at the top of the pocket keeps card and batteries extremely secure inside.
For a girl who lived in Colorado for 23 years of her life, Tennessee landscape and scenery is breathtaking. Where Colorado is strong, open, rugged, and dry bordering on barren, Tennessee is lush, humid, dense, teeming with growth and greenery, and spring comes sooner than I ever thought possible.
Last week we celebrated our second wedding anniversary. How we can have been married forever, and yet 2 whole years have flown by so quickly is a mystery I may never solve. But to celebrate this special day, I found a beautiful park about an hour away from us, near Nashville. In Colorado we would call this an “open space,” but here in Tennessee such a thing is simply unheard of. It’s only where a tree has recently fallen that there’s briefly any open space. Every square inch of ground seems to be teeming with growth; some of it wild, some of cultivated, but life pops out of every corner. Now, back to the park.
There were biking, hiking and equestrian trails, a bull frog pond where I spotted no less than twenty healthy specimens (each croaking out its unique sound that Isaac says is like a loose banjo string), little creeks and streams bubbling merrily, beautiful stone walls covered in soft moss, May apples bobbing in the small breeze (I’m sure one of these days a little fairy is going to peek out from under one of these cute little umbrella-looking plants), squirrels darting from branch to branch, cardinals chirping… with a sleeping baby in my arms, and my dear husband by my side, this idyllic afternoon in May couldn’t have gotten any better. Keep reading to see more pictures.
Now that I’ve been working with our CNC machine for a little while, I’ve begun accumulating various tools to make my various jobs easier. I’ve tested a lot of different types and makers of bits, experimented with a bunch of different ways to mount work to the table, and here are several things that I use every day:
- Freud Straight Flute bits: great for thinner sheet plastic
- Countersink Bolts + Wingnuts: for attaching jigs
- MDF & HDPE: cheap machinable jig material
- 25ft Tape: for measuring big things
- Ruler: for measuring small things
- Calipers: for measuring tiny things
- Pens and Sharpies: to write on everything
- Notebook: to write down everything
- Wireless Keyboard: Remote control of terminal
To be perfectly honest, the most useful things on the table are those last two. I really needed a notebook to keep track of all my settings and measurements, so I could flip back a few days to see what depth I was cutting this jig at, or what that toolpath was supposed to look like, or what feedrates I’ve already tried with a certain bit – without taking the time to load up the files on my computer.
I also wanted to drive the machine without walking back to the computer. There are several options for professional CNC remote controls, but this $15 keyboard works great – once you memorize the key commands for Shopbot’s software. Now I can move, jog, and calibrate the machine from anywhere in the shop. Anyway, all of these little things things have sped up my workflow enough to have time for side projects like this:
A couple of weeks ago I got to design the main poster for the annual Remembering WWII event in Linden, TN. This is a local event organized by some good friends, and lots of folks from our church participate in it. Its main purpose is to honor WWII veterans, and let them teach important lessons from that war. There’s live music, lots of vintage vehicles, and an ever-growing battle re-enactment. I was really happy to get to work on this poster, and I gave it a late 1930s Art Deco style.
Obviously, actual American propaganda posters from WWII were painted in the 1940s, and the most iconic posters have a style and design elements from the 40s. There wasn’t as much Art Deco influence at that time, partly because design fads are usually short-lived, but also because of advances in printing technology. As cheap, mass poster production moved from basic screen printing to four color half-toning, poster design moved from simple geometric shapes and minimal colors to full color paintings, often by brilliant illustrators like Flagg, Barclay, and Rockwell.
However, an Art Deco poster is much easier to imitate than a Norman Rockwell painting, and much more retro. It’s instantly recognizable as something from the past, which is why movies like Captain America usually lean more heavily on the flamboyant and distinctive styles from the early 30s than the more utilitarian designs of the 40s. Have a look at my vector draft after the jump:
This is the CNC router that I’ve been working on for the last two months; the first one I’ve ever worked on. It’s a 4×8 PRT Alpha from Shopbot, and we bought it used, which means that it’s the older model, but it did come all wired up. That means that we got it up and running quickly, but it also means that I don’t really know what I’m doing when I have to find a wiring issue. If I’d wired all the connections from scratch, I might actually remember what things are. As it is, I find that I have to talk to tech support about once a week.
All in all, I’m pretty happy with this machine. In function, price, and capability, it sits somewhere between a DIY hobbyist tool and full-fledged production machine. It’s cheap (for what it is), and you are expected to be pretty handy with a multimeter and machine code to keep it working (I am not handy with these things). There is no hand-holding or helpful software wizards or internal digital diagnostic checks on this machine. On the other hand, it is a sturdy steel table equipped with fast and powerful stepper motors and a 4hp spindle that can do a lot of serious work.
Here are a few “starting-out” lessons I’ve learned that seem really obvious in hindsight. As you might guess, these are trial and error kinda lessons:
Tomorrow is the two-year anniversary of our engagement, but since Heidi and I plan to be busy then, I thought I’d post about this ring tonight. I think I’ve gotten more questions about this ring than she has, which is a little strange, but then again, I spent a fair amount of time thinking about what Heidi might be looking for an engagement ring before she was probably ready to think about being engaged. It is, by far, the most special design project I’ve ever worked on.
When Heidi first saw this ring it marked the very special first day of our engagement. Interestingly, because I’d been working on it for so long, I more thought of it as marking the end of our wonderful but much more uncertain un-engaged relationship. I started working on it so early because I didn’t know how long it might take to learn how to make a ring like this. I only worked on it when we were apart. When things were going well, I’d sketch on it while I prayed about my hopes. When things were going not so well, I’d worry that I’d never be able to show it to her.
And two years ago, she saw it for the first time. And now, the boring technical background. This was only my second jewelry experiment (here’s the first), and I didn’t know anything about rings, but I knew what I wanted, and thanks to some undercover research that her sister Megan had done on my behalf, I thought that I had a pretty good idea of what Heidi would want.
That being said, my first design didn’t actually work. I sent drawings around to a few foundries that specialize in mechanical parts and jewelry casting, and I was told that I hadn’t made the prongs that hold the stone quite strong enough for the angle I had placed them in. I wanted a strong, practical ring that would last, so I tweaked the angle and thickness of a few parts, and ended up with this: