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Grow your business by digitizing your firms’ compliance amidst the pandemic

Register Here
https://tinyurl.com/yzf2js2u

To join our Global Compliance Webinar as we show you how to:
– Tackle Compliance Challenges with a limited budget
– Ease the burdensome compliance tasks
– Meet the regulatory mandates more efficiently
– Eliminate the compliance obstacles impeding the company’s growth
– Implement attentiveness to crucial compliance issues
– Gain a competitive edge with Compliance Automation
– Streamline the end-to-end compliance workflow

 

image processing – Digitizing a geometrical sensor

I want to quantify the flow from photos taken from a sensor such as this one:
Flowmeter

For a limited number of readings, I can use a plot digitization method. However, I need to do this many times for hundreds of photos to construct the flow as a function of time. The location of the sensor is somewhat challenging, so I can’t use a camera stand either (meaning the position of min and max are probably not constant in time due to hand held recording device). Therefore, I am trying to make this process automated.
The location of the top of the ball with respect to the scale is what I am looking for. The approach I have in mind follows, but if anyone can suggest a better approach that would be even more appreciated.

I imported the image and called it img1. Then I binarized it:

bin = Binarize(img1, 0.3)

Then I negated the image and cleaned it up slightly:

cleanup = DeleteSmallComponents(ColorNegate@bin, 50)

MMA’s text recognition doesn’t seem to be working with these numbers, so I gave up trying to use it. However, after many tests I found MorphologicalPerimeter quite useful:

HighlightImage(img1, MorphologicalPerimeter(cleanup))

cleanup

Also, I found out these thresholds can isolate the scale:

SelectComponents(cleanup, #Elongation > .4 && #AdjacentBorderCount == 
0 &)

and for the ball:

DeleteSmallComponents(cleanup, 1500)

However, now I am stuck. I don’t know how to construct a tangent on top of the ball and determine where it lands on the scale e.g. where it intersects the line connecting the middle of indicators for 0.1 and 1.0.

Digitizing slides with a camera: still too much noise

Perhaps not a total fix, but some ideas in hopefully a helpful direction.

I doubt the noise is camera noise at 100 or 200 ISO, if you are completely filling the frame of the D5000. My D5500 is newer, but I’m almost sure it couldn’t be that much noisier than mine.
It is, btw, just about fixable in Photoshop, pic at the end of a quick ‘fix’ attempt.

To fix your focussing issue, shift the camera to Live View, then use the + (magnifier) button bottom right to zoom in as far as you can. Adjust manual focus whilst you can see one of the hardest-edged details in your slide.
(I’ve subsequently seen the new question & don’t know why the reversing ring can’t focus… unless it has no electrical connections)

You have some vignetting (a darker ring round the edges) – possibly because your diffuser isn’t absolutely ‘perfect’ or your light source is too close behind it, or indeed that the lens itself (not designed to work that way round) is vignetting. You may not be able to fix this entirely, but you could perhaps swap out the tissue I previously suggested for some proper diffuser gel. You can get this for just a few $£€ on eBay. It is, comparatively, optically perfect. It may still not be quite enough to get rid of all the vignetting. This can anyway be fixed in Photoshop to an extent.

You also have a purple-ish colour shift. this might be the film or it might be your white balance, or even the LED. Probably film. It may well change between film batches too.

With some Photoshop ‘magic’ you could actually work out how to automate all of this – but that’s definitely for another question (& someone better at Ps batch scripting than me).

Anyway – a quick attempt to smooth the noise, pull back some of the purple, punch up the remainder, knock back some of the over-bright centre & balance out the vignette. (It’s not perfect, it’s a 5 minute quick fix.)

enter image description here

eBay UK link to an example gel diffuser (not a recommendation, per se)

Which color photo filter can I use after digitizing to compensate for a strong magenta touch on my color slides?

I'm going to digitize a large number of slides. All of them have a strong magenta glow. I used Photoshop to try a fix, but with limited success. Those with whom I have the most difficulty were placed in a mine with lightning and sometimes with multiple flashes, but the cast is also available when shooting outdoors without a flash. The slides were taken 1973 to 1975. Using Auto-Color in Photoshop does not seem to help.

Best tools and equipment for digitizing film negatives with DSLR without breaking the bank

I am considering the purchase of Lomography DigitaLIZA film masks for both 35 mm and 120 mm films that can be used in my digitization process, but I'm not sure which methods work best in the other areas of my process are.

I mainly fight for the backlighting of the negatives. I have an iPad on which I have initially used, on which a blank white screen with my negative up and a glass / plexiglass panel are shown up for flattening. However, I found that when looking at the photos of my negatives, I could actually see the pixels of the retina display in the whiter areas. I got better results with no pixels in the background when I raise the negatives, remove them from the screen, and lay the setup on a cardboard box. However, this can sometimes lead to another problem … make sure everything is level.

I've seen people use photocopiers and movie lights, but the products I've looked at can cost a lot.

Does anyone have similar experiences with the digitization of film negatives and ways to do so without breaking the bank?