An iconic image for geeks

Roots of Silicon Valley

Iconic images are images that stick in our mind— that have symbolic significance beyond their mere pictorial content. Two good examples of iconic images are  Che Guevara and Uncle Sam, Che symbolizes the free spirited revolutionary to some and a tyrant to others Similarly, Uncle Sam symbolizes American patriotism or American imperialism— take your choice. Both inspire strong emotions. Both are embedded deep in our memory.

There are iconic images of sports heroes, politicians, movie stars, and musicians, but there is an important omission: technology enthusiasts, i.e., techies— people we now label as “geeks” or “nerds”.

che_iconic uncle_sam_iconic
The stars are a coincidence— or are they?

I’m one of those people. I fell in love with electronics when I was thirteen, and I got my ham radio license the day after my fourteenth birthday— the day Sputnik 1 was launched. Ham radio was what nerdy kids did before computers. We fiddled with equipment and communicated endlessly with each other about capacitors, antennas, and the latest gear. We built kits from Heath, World Radio Labs, Eico, and Dynaco. I also built vacuum-tube hi-fi amplifiers from scratch, which I thought were incredibly cool. (I had a major amplifier-building relapse in the 1990s, documented here). I couldn’t understand why girls failed to share my enthusiasm. Ham radio didn’t do wonders for my social popularity. I was regarded as a “square”. “Nerd” and “geek” had not yet come into widespread usage.

Over the years I adapted. I learned how to communicate with girls (sort of). I got a degree in physics and had a 34-year career in digital magnetic recording technology before starting my own tech business in 2004 (I’m a late bloomer). “Nerd” lost much of its stigma thanks to Steve Wozniak, and “geek” went from strongly pejorative (circus freaks) to downright respectable thanks to a number of techies who became billionaires. (Nothing like big piles of money to deodorize smelly words.)  Still, we had no iconic images, apart from a few of Steve Jobs, none of which stands out.

History under the bed

When my wife moved her elderly mother to Colorado in 2005 and cleaned out the family house in Los Altos, California, she found a photo album under a bed in a spare bedroom. It had apparently been there since the 1950s, put there by Louise’s father, Vorras Elliott. We think there may have been some pictures of old girlfriends he didn’t want Louise’s mother to see. We’ll never know. The pictures were taken in the 1930s, when Vorras was starting his career as an engineer at General Electric in Schenectady, New York, living a house with four roommates.

One of Vorras’ roommates loved to tinker with electronics. Here is photo of him working in the attic. It looks like he’s winding an inductor around a recycled liquor bottle. He dreamed of starting his own company. He told Louise’s aunt that he was only at GE to “learn how they did things”, and that he didn’t plan to stay long.

David Packard in the attic-- the true origin of Silicon Valley

Tinkering with electronics in the attic. This should become an iconic image. Click on the image to view it full-sized.

One day the landlady discovered his equipment. She thought it would blow up the house, and she evicted them immediately. They had to find another house the same day. Neither the landlady nor anyone else could imagine that this tinkering would lead to the creation of Silicon Valley as we know it. In those days it was known as Santa Clara Valley (still its proper name), and it was renowned for its fruit.

Moving west

In August 1938 Vorras’ roommate did something unimaginable. He took an unpaid leave from his relatively secure job at GE, packed his belongings in his car, and headed west on a journey that would become as much a defining myth in modern America (even to many who don’t know the story) as The Odyssey was in ancient Greece. And if you think that’s hype… well, I can’t help myself. Hype is short for hyperbole, another legacy from ancient Greece.

It took real chutzpah to leave GE because jobs were extremely scarce at that time, which was the height of the great depression— the hardest time the United States has had to face in the last century. How scarce? I have a friend whose father was rejected for the same job at GE despite graduating at the top of his class at MIT. It turned out to be a blessing in disguise. He went on to get a PhD at Oxford, help develop the radar system that saved London during the blitz, found the Aerospace Corporation, invent the GPS, and serve as president of IEEE. A distinguished enough career (I’d hire a guy like that), but he didn’t make the cut at GE. Those were really tough times.

Vorras’ roommate settled in a sleepy college town on the San Francisco peninsula called Palo Alto*, where he’d gotten his undergraduate degree.

*This reminds me of my transfer to an obscure suburb of San Jose (near Palo Alto) in 1973. Nobody had ever heard of the place. It wasn’t in any of my atlases, so I had to look it up in the library. It was called Cupertino.

Once he settled down, he and a friend did something really outrageous. They rented a garage to start an electronics company. Now you may think that’s commonplace, but nobody had ever done it before. They were the pioneers (and they managed to dodge the arrows in their necks). Vorras’ roommate lost a coin flip for naming the company, so they called it Hewlett-Packard.

If you hadn’t already guessed, the roommate was David Packard.

There were some other interesting photos in the album. I find the following image to be a fascinating character study.David PackardWhat strikes me about this image is the complete lack of self-doubt or angst— traits that were fashionable among east coast intellectuals when I was young and psychoanalysis was in vogue. Psychoanalysts don’t have a category for healthy personalities like this because they never cross paths. They inhabit different planets.

 A few months after David and Bill started their company, Vorras crash-landed his small plane into an orchard just after taking off (as far as I know he wasn’t injured). David and Lucille (by then his wife) wrote this letter to Vorras and Marlene. Click on it for a larger, readable image with both pages.


Letter to Vorras and Marlene Elliott from David and Lucille Packard, July 10, 1939. Click for a larger, readable image with both pages.

A few notes on the letter:  It says “Dear Gus:” because everybody in the house called each other “Gus” (an in-joke). “Fluke” is John Fluke, who founded a company famous for voltmeters. “Palo Alto is the worst place in the world to find a decent house” is still true unless you have bundles of money. Huge bundles. If you have to ask the price…

I found these lines from page 2 to be quite inspiring:

“You really ought to try it. You don’t know whether you’ll be starving the next month or not, but you’re sure you will be having fun.”

They didn’t starve. In 1995 Marlene attended a dinner in honor of David’s $400 million gift to Stanford. (I imagine he had to be very careful about getting the right number of zeros on the check.)


More images

Here is an image of Louise’s father, Vorras Elliott, David Packard, and a third roommate (I think it’s Hugh Maxwell, who left engineering to become a real estate developer).

Vorras Elliott, David Packard, and (?) Hugh Maxwell

David Packard skiing. His picture is in his autobiography (not as well reproduced).


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Color difference ellipses

Imatest has several two-dimensional displays for comparing test chart reference (ideal) colors with measured (camera) colors, where reference colors are represented by squares and measured values are represented by circles. The two most familiar representations— CIELAB a*b* and CIE 1931 xy chromaticity— are shown below. They are for the Colorchecker image, also shown below, where the upper-left of each patch is the reference color and the lower-right is the camera color. (more…)

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LSF correction factor for slanted-edge MTF measurements

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The LSF correction factor primarily affects very high spatial frequencies beyond most of the energy for typical high quality cameras. But it does make a difference for practical measurements: MTF50 for a typical high quality camera (shown below) is increased by about 1.5%. (more…)

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This post addresses concerns about the sensitivity of slanted-edge patterns to signal processing, especially sharpening, and corrects the misconception that sinusoidal patterns, such as the Siemens star (included in the ISO 12233:2014 standard), are insensitive to sharpening, and hence provide more robust and stable MTF measurements.

To summarize our results, we found that the Siemens Star (and other sinusoidal patterns) are nearly as sensitive as slanted-edges to sharpening, and that slanted-edges give reliable MTF measurements that correspond to the human eye’s perception of sharpness. (more…)

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*F is an abbreviation for Frequency in Log F-Contrast.


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Measurement results are stored in CGATS files, which can be used as reference files for grayscale and color chart analysis in Multicharts, Multitest, Colorcheck, Stepchart, and SFRplus. In many cases, custom reference files provide more accurate results than the default values.

In addition, Argyll CMS is a free, Open Source, command line-based package that can be used for a number of measurements, including illumination intensity and spectrum. See the Argyll CMS documentation for more details. (more…)

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Symptoms of problem:

Upon selection of a region of interest, program stops working, either not responding or crashing.

DOS window error messages: 

  • Operation terminated by user during pause (line 21) In newROI_quest
  • Undefined function or method ‘figure1_KeyPressFcn’ for input arguments of type ‘struct’.
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Source of problem:  

automatic translation software such as 有道首页 (Youdao Dictionary) and 金山词霸 (PowerWord)

Solution to problem: 

Temporarily disable the translation software while performing a ROI selection

We will be working to make our software compatible with these sorts of translation programs in the future, as well as improving our own internationalization.  Sorry for the inconvenience.


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Note that we recommend keeping it enabled even though it is NOT a part of the ISO 12233 standard. If the ISO standard checkbox is checked (at the bottom-left of the dialog boxes), noise reduction is not applied.

The strange word apodization* comes from “Comparison of Fourier transform methods for calculating MTF” by Joseph D. LaVigne, Stephen D. Burks, and Brian Nehring of Santa Barbara Infrared. The fundamental assumption is that all important detail (at least for high spatial frequencies) is close to the edge. The original technique involves setting the Line Spread Function (LSF) to zero beyond a specified distance from the edge. The modified technique strongly smooths (lowpass filters) the LSF instead. This has much less effect on low frequency response than the original technique, and allows tighter boundaries to be set for better noise reduction.

*Pedicure would be a better name for the new technique, but it might confuse the uninititiated.

Modified apodization noise reduction- explanation
Modified apodization: original noisy averaged Line Spread Function (bottom; green),
smoothed (middle; blue), LSF used for MTF (top; red)

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