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Using Echoes of Light to Turn Walls into Mirrors

using a wall as a mirror

 

[Matthias] recently published a paper he worked on, in which he details how his group managed to reconstruct a hidden scene using a wall as a mirror in a reasonably priced manner. A modified time-of-flight camera (PMD CamBoard Nano) was used to precisely know when short bursts of light were coming back to its sensor. In the picture shown above the blue represents the camera’s field of view. The green box is the 1.5m*1.5m*2.0m scene of interest and we’re quite sure you already know that the source of illumination, a laser, is shown in red.

As you can guess, the main challenge in this experience was to figure out where the three-times reflected light hitting camera was coming from. As the laser needed to be synchronized with the camera’s exposure cycle it is very interesting to note that part of the challenge was to crack the latter open to sniff the correct signals. Illumination conditions have limited impact on their achieved tolerance of +-15cm.


Filed under: digital cameras hacks

Programming Pi Games With Bare Metal Assembly

pifoxWhile the most common use for a Raspberry Pi is probably a media center PC or retro game emulator, the Pi was designed as an educational computer meant to be an easy-to-use system in the hands of millions of students. Team 28 at Imperial College London certainly living up to the Raspberry Pi Foundation’s expectations with their bare metal assembly clone of Star Fox, aptly titled PiFox.

This isn’t the first time a college course has taken up the task of developing software for the Pi without an operating system; a few years ago, Cambridge University started that off with a series of bare metal tutorials for the Pi that included drawing graphics on the screen and playing around with USB keyboards. PiFox greatly expands on what those early tutorials could do, reading an NES joystick from the GPIO pins, sound with DMA, and rendering 3D objects.

If you’d like to build PiFox for yourself, or better yet, expand on the existing build, all the code is up on Github. There’s also a Raspberry Pi emulator for Linux, just in case you have an ARM assembly bug you just can’t scratch with a Raspberry Pi.


Filed under: Raspberry Pi, Software Development

Hackaday’s Wikipedia Page Needs Help

Wikipedia-logo-en-bigHey, did you know we have a Wikipedia page? We didn’t either. Until today you could search for “Hackaday” and nothing would come up. That’s because it’s listed as “Hack a Day” and it hadn’t seen any TLC in at least a couple of years.

Here’s the great thing about Wikipedia, they want factual information so they discourage people with Conflicts of Interest from editing the pages. That means that having the Hackaday Staff edit the page is a sticky issue. I did indeed edit the page in order to add more sections (History, Hackaday Projects, Accolades) to make it easier for the community to work on the article. I disclosed this in the “Talk” section, requested the logo be uploaded, and began a discussion suggesting the page be moved.

Ethically this is about all I think we should do. It’s up to you now. We’d love to see a well-written, immaculately cited Wikipedia article for this great thing we’re all involved in.


Filed under: misc hacks

Hackerspace Tour: EG MakerSpace in Victoria, Australia

EG MakerSpace

We’ve just heard word that the East Gippsland MakerSpace, located in Bairnsdale, Australia needs more members! They sent us a wonderful tour video, and their place looks simply awesome.

It’s a very large facility (looks like an old school) that might even rival some of the biggest hackerspaces we saw during our Hackerspacing in Europe tour — seriously they have a room for everything!

They have all of the basic stuff like an electronics lab, a woodworking area, a community lounge, the kitchen, a metal working area, a general arts and crafts area. But then they also have a sound booth (in progress), an aromatherapy and massage room, a pottery room, a sculpture room, a multi-purpose hacking room, the network server room, a retro arcade and computer training lab, and loads of storage!

Stick around for an official walk-through tour by the founder [Scott Lamshed]!

So, if you happen to live in the area, and haven’t heard of the EG Makerspace yet, go check it out, we would!


Filed under: Hackerspaces

Iraq cracks down further on social media — but leaves ISIS-affiliated web sites alone

Iraq cracks down further on social media — but leaves ISIS-affiliated web sites alone

Above: Blockpage seen on ScopeSky Communications when trying to access Twitter from an Iraq location.

Image Credit: Citizen Lab

Iraq has blocked the URLs of 20 web sites since the Islamic State in Iraq and Greater Syria (aka ISIS) launched its violent takeover in Northern Iraq two weeks ago. The blocked sites include Twitter, Facebook, and Viber.

But seven websites that are either maintained by ISIS or support its bloody rampage have been left alone by the Iraqi government, leaving some to wonder about the government’s intentions as it battles to stave off its own collapse.

Akami-Iraq disruption chart

Above: Akami-Iraq disruption chart

Image Credit: Citizen Lab

Two of Iraq’s largest cities, Mosul and Tikrit, fell to ISIS two weeks ago. The Iraqi government responded by severely restricting average Iraqi’s Internet access and by cutting off all social media and video sharing sites, according to a comprehensive report on Iraq by Citizen Lab, a Canadian research group focused on information and communication technologies. According to Citizen Lab:

“The websites our tests found to be blocked represent a small number of content categories, and generally correspond with the list of sites ordered to be filtered by the Iraqi Ministry of Communications. We also tested the accessibility of 7 URLs of sites which are affiliated with or supportive of ISIS. We did not find any evidence, through both DNS lookups and proxy testing, that any of these URLs are blocked.  Given that the insurgency was cited as the rationale for the shutdown and filtering, this finding is curious.”

A former U.S. intelligence official told VentureBeat that one reason for the Iraqi government to keep the ISIS sites accessible within the country is so that Iraqi intelligence officers can monitor the sites and track their users. Whatsapp and Skype have also been blocked, leaving many Iraqis scrambling to get around the blockage using proxy servers in neighboring countries or portable hot spots synched to smart phones. You can read Citizen Lab’s excellent report on Iraq here. To help get around the blockage, Iraqis have reverted using a circumvention app called Psiphon, according to Citizen Lab.


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Israel and China sign $300M deal to spur nanotech-computer science innovation

Israel and China sign $300M deal to spur nanotech-computer science innovation

Above: Tel Aviv University president Joseph Klafter

Image Credit: Richard Byrne Reilly

Israel and China are now BFFs — at least when it comes to the subjects of nanotechnology, computer science, and other high-tech fields.

Two prominent tech universities from both countries – Tel Aviv University and Tsinghua University in Beijing — recently signed a $300 million deal that will see an exchange of Ph.D students from Israel and China. And eventually, satellite offices on both campuses.

Leaders from both schools see this deal as more than just an expensive exchange of top-shelf talent.

While nanotechnology will be one of the primary focuses initially, Tel Aviv University president Joseph Klafter sees the newly minted relationship as a way for students to collaborate and eventually launch IT-centric startups of their own.

“The Chinese are looking for partners in order to excel their innovation process,” Klafter told VentureBeat in a Monday sitdown. “They will be the next generation of researchers and innovators.”

The deal marks the largest such exchange in the history of the two countries and has profound implications for global tech innovation. Israel produces some of the best developers in the world, and China does, too. The deal also shows Chinese interest in tapping the tech know-how of the Holy Land, with its tiny population of 7.9 million, that many refer to as “startup nation.”

Initially, seven graduate students from Tel Aviv University and 14 graduate students from Tsinghua University will take part on the exchange. Part of the $300 million, according to the studious Klafter, will go toward designing prototypes and connecting the academic sector to the broader business world and to commercialize joint projects.

The $300 million initiative is called Xin, which is Mandarin for heart or mind. Klafter has exceptionally ambitious plans for Xin, as do his Chinese counterparts. Nanotech cooperation is high on the list of priorities, followed by medical apps and environmental subjects. IT research will then join in.

So far, this effort has raised $100 million, with the cash coming primarily from the private sector, sans governments. Construction will also take place on the campuses of both schools to house the program. There is no downside to the deal, Klafter said, noting that Tsinghua University is called the “MIT of China” while Tel Aviv University has the best computer science program in Israel.

“We will now have an academic presence in China. There are lots of fellowships and faculty in the cooperation. The Chinese are looking for different types of cooperation, and they wanted the innovative side,” Klafter said. “Lawyers from both sides have already fine-toothed the deal, and intellectual property right exchanges have been signed. The deal has created a lot of noise,” he said.

While Krafter and his Chinese colleagues hope to raise the rest of the dough soon, the focused university chief pictures a win-win for both sides. He eventually sees Israeli tech ideas turned into startups and making money in Beijing, and sees the same for Chinese participation.

“The focus is on everything, from startups to basic research,” he said.

Krafter smiled and put his iPhone back into his pocket on his way to yet another meeting in the Valley before flying home to Tel Aviv.

“Anything that leads to an idea,” he said of the deal. “Scientists run the world.”








Auto dealers launch charm offensive against Tesla’s direct sales

Auto dealers launch charm offensive against Tesla's direct sales

Above: A Tesla store.

Image Credit: Phil Denton/Flickr

The battle between Tesla Motors, which sells its electric cars directly to buyers over the Internet, and the nation’s auto dealers–who want to make that practice illegal–is now in its fifth year.

And for the very first time, the dealers’ national trade organization has embarked on a charm offensive to make its case directly to the public.

With a website and various marketing activities, the National Auto Dealers Association (NADA) highlights the many benefits it suggests auto dealers offer to car buyers, their local communities, and the industry at large.

The campaign, entitled Get The Facts, is intended to “inform the media, opinion leaders and consumers about the numerous benefits of America’s franchised new-car dealer network.”

While Tesla and its direct-sales model are never mentioned, the campaign echoes themes that dealer lobbyists made been making for years.

Some of those themes were articulated by Tim Jackson, president of the Colorado Automobile Dealer Association, in an interview with Green Car Reports almost two years ago, in which he explained why it was in the car buyer’s own interest that his group had gotten legislation passed in 2010 to prevent Tesla from opening any further stores in his state.

The centerpiece of the NADA campaign is a friendly two-and-a-half-minute animated video (viewable below) called “A Good Deal For All.” It asks the question, “Will dismantling the car-buying experience help consumers or hurt them?”

The initiative appears to be aimed at women; the car buyer is referred to as “she” throughout the video. That may be a smart choice, as women are often the decision-makers on what car is ultimately bought by families that are headed by a man and a woman.

The cartoon dealerships are shown in a friendly green, while the automakers are represented by grim black factories with multiple smokestacks.

NADA’s video makes several points about the benefits it believes local dealerships offer.

Among them are price competition, consumer safety during vehicle recalls, after-sale support and service even if a manufacturer pulls out of the market, local jobs and tax revenue, and simple convenience.

Competing on price

First, the NADA video notes that consumers benefit by having a wide array of pricing information available, and being able to shop among competing dealers to get the best price.

“Some want to let automakers bypass dealerships, eliminating competition,” it warns.

“A distant corporate office indifferent to local markets would set prices–prices you can’t negotiate,” it says.

“Some call this ‘factory-direct, implying that so-called ‘middleman costs’ would be eliminated. That’s a myth that’s just plain wrong.”

It names costs like showrooms, lots, test drives, trade-ins, inspections, titling and registration, and the staff to do it all. (The profit earned by each local dealership is omitted.)

Automakers would have to absorb those costs–for which, the video suggests, buyers will still pay–but without the benefit of dealers trying to undercut each other on price.

Nonetheless, NADA itself indicates that car buyers only visit an average of 1.5 dealers today–against five dealers about a decade ago–due to the benefits of online research, as noted by Ward’s Auto. Completing the transaction and buying the car itself, however, cannot be done online.

Parts involved in GM ignition switch recalls

Hurting consumer safety?

Then, there’s safety–obviously a hot topic amidst the current GM ignition-switch recall fiasco.

“Bypassing dealerships would also hurt consumer safety,” NADA suggests. “Since factories pay dealers to perform warranties and recall work, dealers are incentivized to service their customers’ vehicles.

“Automakers don’t have this incentive; for them, warranties and recalls mean more costs,” it says.

That may be the most inflammatory point in the video. Automakers–from GM to Tesla, and the rest too–would likely take severe exception to the idea that it’s only dealerships that are preventing them from killing or injuring their buyers.

Indeed, it’s not at all clear that dealerships played any significant advocacy role in the decade-old GM ignition-switch safety debacle. Although if they did, that might well be a good example for NADA to use in support of its assertion.

Makers depart, dealers remain

Third, “even if manufacturers stop doing business, like Saab, Suzuki, or Fisker, dealers are still there for that work–giving extra accountability for the process.”

That one, unfortunately, may not be shared by 1,000 or more Fisker buyers–many of whose dealers took down their signs and closed up shop mere months after selling them their $106,000 range-extended electric luxury sedan.

And ask your local Saab or Suzuki owner how good their service is–in the case of Suzuki, only two years after it announced it would exit the U.S. market.

Local jobs and tax revenue

The fourth point is that dealerships generate lots of local jobs and, consequently, tax revenue.

The video doesn’t explain why service managers, technicians, car detailers, drivers, and all the rest wouldn’t simply be employed at company-owned stores.

(The implied concern over support for community activities like fire departments, softball teams, charity drives, and other local events is likely quite valid indeed.)

Finally, the video winds up by saying dealers just make the car-buying process more convenient–taking on the “complex process” of arranging loans, managing legal paperwork, and getting the car taxed, registered, and titled for delivery.

We’d love to see a test of the total time required to buy a Tesla Model S online and arrange financing versus the process for doing the same at a local dealership.

Money and car keys

Simple language changes

The last four years of skirmishes between Tesla’s online sales model and dealer lobbying in state legislatures has produced mixed results.

In some states–New Jersey being the latest–bills favorable to auto dealers, sometimes tacked on as amendments to bills addressing entirely unrelated issues, have been publicized by Tesla or its advocates.

That has often provided a level of transparency and awareness to such legislation that it may not have had.

Given that the bills often address the arcane state rules under which franchises are granted and administered, banning Tesla from a state can be as simple as removing a few words from one or two sentences of legislative legalese.

As the Colorado Auto Dealers Association wrote in its 2010 End of Session report:

An existing provision in Colorado law already prevented a manufacturer from operating a dealership so long as they were not [sic] franchised dealerships. This statue [sic] narrows provision [sic] so a manufacturer that has any dealerships in Colorado, whether franchised or not, is prohibited from operating a dealership.

In other words, the original intent of such laws–to protect franchised dealers who had invested in their businesses over many years or decades from being undercut by the automakers they had to rely on for cars–had been considerably broadened to forbid any carmaker to sell a vehicle to a retail buyer under any circumstances.

Outlook varied

Most Americans today remain seemingly ignorant of the fact that in most states, it’s illegal for GM or Toyota to sell them a car. But dealers’ anti-Tesla efforts have clearly raised at least some awareness of the issue.

So perhaps NADA’s PR campaign may be just the first step of an escalating battle for the hearts and minds of American car buyers.

And depending on how fond you are of your local dealer–more specifically, how well you were treated the last time you bought a car or had it serviced–your reactions to the video may vary radically from those of your neighbor.

Which is why the outlook remains uncertain in the state-by-state battle, and likely will continue that way for some time yet.

Meanwhile, at least some buyers in states that ban Tesla direct sales will continue to find workarounds to get the luxury electric cars.

Dealer forecast: Mixed, with some clouds on the horizon.

This story originally appeared on Green Car Reports.



Tesla's goal is to accelerate the world's transition to electric mobility with a full range of increasingly affordable electric cars. Palo Alto, California-based Tesla designs and manufactures EVs and EV powertrain components. Tesla ha... read more »








Google reportedly acquiring video-search startup Baarzo

Google reportedly acquiring video-search startup Baarzo
Image Credit: Baarzo

The video-search startup Baarzo has something that Google is willing to pay for.

Reports today from TechCrunch and others say that the two companies have been in talks and that a deal has now been reached.

Baarzo says what Google wants from it is “true video search,” which looks for specific events in videos — like a dramatic reveal, a runback for a touchdown, or a stunning World Cup goal.

Here’s how the company describes its service at its website:

“Unlike Google or YouTube searches, which only evaluate the text around the video, the Baarzo search technology actually analyzes the video content, recognizing hundreds of thousands of objects and millions of faces, and locates the precise moment in the video when the search objects interact in the way you had specified.”

The technology apparently works, or else Google would never have come so far down the road to an acquisition.

Google executive chairman Eric Schmidt reportedly saw a demo of Baarzo’s technology at Stanford’s business graduate school.

Baarzo lists two individual angels at its AngelList page. The company lists Sun Microsystems cofounder Scott McNealy as an adviser.

We’ll have more on this story after formal announcements are made.



Google's innovative search technologies connect millions of people around the world with information every day. Founded in 1998 by Stanford Ph.D. students Larry Page and Sergey Brin, Google today is a top web property in all major glob... read more »