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Quorten Blog 1

First blog for all Quorten's blog-like writings

Still looking for Raspberry Pi NoIR camera filter

quorten

2016-12-12

Categories: raspberry-pi  
Tags: raspberry-pi  

Okay, I’m still looking for Raspberry Pi NoIR camera filter. What is the spectral range of the Raspberry Pi NoIR v2 camera? I have information on the v1, but that was made by Sunny, not Sony. Does the v2 really have the same range and response characteristics? Where is the spec sheet for the camera? Why isn’t it linked from the site?

20161211/http://uk.rs-online.com/web/p/video-modules/9132673/
20161211/https://www.element14.com/community/docs/DOC-81672/l/new-pi-camera-and-pi-camera-noir-v2

Hey, this is a very interesting and useful protective case for the Raspberry Pi camera. Heck, it might even be big enough to hold the Raspberry Pi Zero with batteries!

20161211/https://www.amazon.com/Latest-Raspberry-Camera-Case-Megapixel/dp/B00IJZJKK4

20161211/https://www.raspberrypi.org/products/pi-noir-camera-v2/
20161211/https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=60103

Okay, so apparently, the reason why the spec sheet isn’t linked from the site is because it was never provided to Raspberry Pi Foundation by the manufacturer, so I’m told is the case with the v1 NoIR camera and might also be the case with the v2 NoIR camera.

Read on →

Pentax K-1 and infrared photography

quorten

2016-12-12

Categories: pentax-k-1-camera  
Tags: pentax-k-1-camera  

Okay, so I’m wondering. How does the Pentax K-1 do with infrared photography?

After some searching, it looks like what you need to do is get the camera converted. So, the infrared filter is included in the camera by default.

20161211/http://www.us.ricoh-imaging.com/index.php/cameras/cameras/k-series/pentax-k-1

Is the Pentax K-1 really mirrorless? I thought it had a pentaprism viewfinder with flip-up mirror? It does. So, that must be an error on the side of the third-party site.

20161211/https://kolarivision.com/product/pentax-k1-converted-camera/

Okay, this is a different conversion company than previously mentioned. Search backwards for “Infrared with a DSLR”. In that article, they cite a company’s website called MaxMax. Then there is another conversion company from another article I’ve cited called LifePixel. But also, it made reference to Kolari Vision for buying a self-conversion kit. Yep, it’s the same website. Okay, we’re in good business. No need to worry about fakes and forgery here.

Oops, on my way navigating toward the camera tech specs, I encountered a 404 stale link for an article that was supposed to point to the Pentax K-1.

Read on →

Looking for infrared filters for Raspberry Pi

quorten

2016-12-12

Categories: pentax-k-1-camera   raspberry-pi  
Tags: pentax-k-1-camera   raspberry-pi  

National Camera Exchange is a good place nearby (in Golden Valley, Minnesota) to consider to go for buying camera equipment such as filters.

20161211/https://www.natcam.com/locations/Golden-Valley/
20161211/https://www.natcam.com/?s=IR+filter&post_type=product

Possible filters to consider. On from Schott, one from Hoya.

20161211/http://www.ebay.com/itm/Schott-RG780-46mm-x-2mm-Longpass-IR-Infrared-87-Filter-fits-Kuribayashi-35mm-/302034604698?hash=item4652aa529a:g:sf8AAOSwdzVXpnTg
20161211/http://www.ebay.com/itm/Hoya-U-360-52mm-x-2mm-UV-Pass-Camera-Filter-Ultraviolet-Dual-Band-IR-/291967426367?hash=item43fa9d5f3f:g:oUcAAMXQY8JRgPXy

20161211/Google schott rg780 filter

Here is the data sheet.

20161211/http://www.sydor.com/wp-content/uploads/SCHOTT-RG780-Longpass-Filter.pdf

Here are some cheaper filters.

20161211/http://www.ebay.com/itm/720nm-IR-Camera-Conversion-Filter-29mm-x-25mm-x-1-35mm-LPF-720-2925135-/111542886562?hash=item19f87960a2:g:qr4AAOSwj0NUhfKE
20161211/http://stores.ebay.com/Stock-Optics-Ltd/_i.html?_nkw=IR+Filter&submit=Search&_sid=270817150

Read on →

UV photography, history of DSLR cameras, camcorders, M-DISC

quorten

2016-12-11

Categories: pentax-k-1-camera   raspberry-pi  
Tags: pentax-k-1-camera   raspberry-pi  

Wow, interesting article on UV photography with a DSLR camera. In fact, one of the first! Nikon D1X. And it worked quite well, as far as the sensor was capable. So, what do you need to do? The main thing you need to do is get the right lenses. Then, make sure you prevent any stray light from entering the viewfinder, and take long exposures with exposure compensation, due to the low light levels of ultraviolet light.

20161210/http://www.naturfotograf.com/UV_IR_rev01UV.html

Interesting site, why don’t I take a look at the home page?

20161210/http://www.naturfotograf.com/index2.html

20161210/https://en.wikipedia.org/wiki/Nikon_D1X

Wow, interesting, the Wikipedia article makes citation to the same person who wrote that site!

At the time, Bjørn Rørslett famously stated that the camera spelled “The End of The Beginning (of the digital era) - The Beginning of The End (of the film era)”. The development of the D1 is generally accepted as one of the major milestones in the development of the digital camera, and Kodak’s initial market dominance was genuinely threatened for the first time.

Read on →

Raspberry Pi camera lens

quorten

2016-12-11

Categories: raspberry-pi  
Tags: raspberry-pi  

Tracing the development of the Raspberry Pi camera lens. First, people started “hacking” the standard camera module by manually removing the IR filter. The resulting applications were widely popular, and the community kept asking about a way to get the camera module without the IR filter to remove barriers, so eventually, Raspberry Pi foundation was able to negotiate with their supplying manufacturer, Sunny, to setup a dedicated manufacturing line that produced the camera modules without the IR filter.

20161210/http://hackaday.com/2013/05/27/adding-night-vision-to-the-raspberry-pi-camera/
20161210/https://www.raspberrypi.org/blog/infrared-camera-you-asked/
20161210/https://www.raspberrypi.org/blog/ir-filter-shenanigans/

Uses for a low-cost 3D scanner

quorten

2016-12-11

Categories: 3d-scanning   3d-scanner  
Tags: 3d-scanning   3d-scanner  

3D scanning notes. 3D scanner notes. So, you ask, what kinds of uses does a low-cost 3D scanner have? Medical uses, of course. There are lots of medical uses for such devices. Yeah, but that’s like saying that X-ray photography has lots of medical and dentistry uses, which it indeed does. However, if you’re like most people, you don’t end up getting an X-ray every day, unlike may be the case with using your smartphone or computer. So, this is a rather shallow argument. What remains true that can be said is that these devices are indeed useful, it’s just that they tend to more have niche uses rather than mass-market, everyday, consumer electronic uses.

20161210/http://hackaday.com/2016/12/09/this-diy-wearable-assist-goes-beyond-traditional-therapy/

3D scanning spectral analysis, and Raspberry Pi NoIR

quorten

2016-12-11

Categories: 3d-scanning   3d-scanner  
Tags: 3d-scanning   3d-scanner  

Interesting, but of course, their approach doesn’t nearly meet my demands because it is low-resolution. But, that’s just to show that there is indeed a lot of variation in the sensor requirements.

20161210/https://www.technologyreview.com/s/529986/turning-a-regular-smartphone-camera-into-a-3-d-one/

Okay, cool, I can put these words up another way. If you need resolution, you really only have two choices: visible light and ultrasound. You might have a remote third choice, infrared light, but of course the wavelength has to be relatively short. And that’s the point. You need a short wavelength sound or light source in order to be able to even think about scanning small feature details at high resolution.

  • There are also other practical considerations like the atmospheric absorption of the waves. Ultraviolet light is quickly absorbed by the Earth’s atmosphere, and although low-frequency sound can travel long distances through air, high frequency sounds tend to be quickly attenuated over short distances. So, that’s another limitation with ultrasound. On the other hand, ultrasound travels through fluids quite well.

    Likewise, there is a similar problem with some microwave frequencies such as 60 GHz waves. These waves also get readily absorbed by the atmosphere.

Read on →

Finding the center of a 3D scan model

quorten

2016-12-11

Categories: 3d-scanning   3d-scanner  
Tags: 3d-scanning   3d-scanner  

Point slicing consistency and center analysis. How does this work? Basically, you designate a certain point as the “center” of the model, and planes are drawn emerging from that point to determine the stitch boundary patterns for stiching two separate 3D scans together into one. That was my older idea. But my newer idea…

Don’t worry about the merge lines being weird. The main idea is to choose the highest quality points, and only one of them from available candidates. Note that available candidates must agree in normal direction so that we don’t have issues when trying to scan things like thin card pyramids.

3D scanning, visible light versus infrared light

quorten

2016-12-04

Categories: 3d-scanning   3d-scanner   important  
Tags: 3d-scanning   3d-scanner   important  

Important!

So, why do you develop prioritization of your 3D scanner using visible light? Here’s the main reason why: resolution. I’ve stated earlier that the goal of my 3D scanning project is to produce a high-resolution, low cost 3D scanner. And that’s precisely what you get by using visible light for the scanning. Sure, you can also use infrared laser light, it’s just that getting a camera that can see that is less convenient. And sure, you could try using radar if you wanted to, but due to the much longer wavelengths of light involved, you wouldn’t be able to get nearly as much resolution. And sure, you can also use sonar, but again, that comes with a problem of resolution. Ultrasound is a viable mechanism for high-resolution scanning, but ultrasound equipment comes with the problem of higher costs.

Read on →

A basic HTML page for displaying a color on any monitor from any computer

quorten

2016-12-02

Categories: misc  
Tags: misc  

I was adjusting the light intensity and color temperature of some monitors on a computer to match the color temperature and light intensity of a surrounding room. However, these monitors were connected to a Mac computer that was not my own, containing only “basic” software on them as of 2016. So, how. A basic painting program would normally be my first go-to place for displaying a color on the monitors. But, considering there was no basic painting program on this computer because it was a Mac, my next go-to would naturally be the web browser. Every computer in today’s modern world must have a web browser, so I can simply display a color on the monitor by writing a very simple web page. So, this is what I wrote.

color.html:

<!DOCTYPE html>
<html>
<head>
<title>Color</title>
</head>
<body style="background-color:#ffe0a0">
</body>
</html>