Photo Measure App Download
Marquetta Marteney
Suppose I have a photograph of the sky. Is there a way to determine an angle between two points in the sky? In real life I would use empirical hand gestures (see attachment) or a theodolite. But what if I have a photograph and not the real scene? Is there a software for that?
If you know your resolution of your pixels, you can measure the location of each target in pixels, do some math to determine how far apart they are (in pixels), and translate it all into distances in arc seconds.
If you do not have a digital file to measure, you can simply take the distance between two objects of KNOWN separation (which you can get from a star atlas, planetarium program, or something) and measure it. Compare it to the measured distance between your two target objects. Do some ratios. Simple pie.
Distortion may be noticeable if measuring(via pixels) a widefield image and measuring points one above the other, different values will be found if measured in the East horizon compared with the same points as the stars would rotate overhead at zenith later in the night.
FWIW, the science of measuring points on photos is called photogrammetry.
I use it often in the videos I take of the night sky.
Software that matches an image to a known map (regardless of projection) has measurement tools that compensate for and eliminate any distortion.
Consider my workflow below (note anything in image can be measured stars or otherwise):
Having "plate solved,"[beware the term is often someone misappropriated to mean where the mount is pointed, and not in reference to the actual image (initial meaning)]
I can find "landmarks" from which I can use to make measurements.
I load up Stellarium (free astronomy software program) and find the proximate Field of View of the same location.
With a simple screenshot of Stellarium,
I paste it into Photoshop with the image,
align them, mark the points to be measured,
and then with Stellarium I'm able to eyeball the two points to measure with Stellarium's simple sky angular measuring tool.
A simple cut and paste shows me in Photoshop how close the measuring tool points are to the desired marks.
The whole process takes me less than two minutes.
I want to measure distances by taking pictures with camera, in example, I will take photos like in this uploaded image, the distance of the blue ligne is known, and I ask the app for detecting and measuring the red ones.
Can I do it?
antibiogramme576600 150 KB
Use the black and red balls working together for measurement and use the fine control to increase 'resolution'. The center of the ball is the measurement point. The balls are translucent so it is possible to move a ball to nearly the exact point you need.
Balls can be dragged to initial measurement location point. The Red and Black locations can be fine tuned, LongPress on central "joystick" block selects changes between movement of the red or black ball.
Use the green and violet balls working together for measurement too but fine movement control of the balls is not available in the example.
Example petri dish image is 467 x 464 pixels. The radius of a ball set at 10 pixels. When you measure the diameter of the petri dish you get a result of 446 pixels; however, since the ball cannot move out of the canvas, add 10 pixels twice so the result is really 466 pixel across the diameter of the petri dish. This is fairly good precision. Check the calibration by measuring the red 100 pixel scale bar. Use the 'red and black' balls together.
Hi SteveJG. I want to ask you about this subject. Can we use in transparent png or jpg, with a grid to overlap the image, so you can measure easily with quadrants? if you know the size of the object and the size of the grid, you can make a calculus of what area is occupied or not.
I think we can add the grid as optional with a switch.
I ask this because in geology we use a grid in the microscopy for COUNTING minerals.
That's the idea SteveJG!. Perfect. I was thinking in this kind of grid, also, we COULD use (my old idea of StereoNET) like a Wulff Net, equi angular or... MAYBE is more suitable for this kind of project --> the schmidt net (equi AREAL)!, because is EQUI AREAL, you can measure AREAS.
Anyway. I was thinking for this project an overlapping transparent png in the camera section and take only what is in the circular shape. So the area inside the circle could be easily measure.
we COULD use (my old idea of StereoNET) like a Wulff Net, equi angular or... MAYBE is more suitable for this kind of project --> the schmidt net (equi AREAL)!, because is EQUI AREAL, you can measure AREAS.
Hi Steve. I couldn't reply in time because personal health problems.
Well. About the Stereonets with schmidt net, you can measure Great Circles. all this circles have an Equal (same) area, so you can be sure the size of a part in a circle adding parts of this areas. Is like a grid (but ONLY MORE COMPLEX TO IMPLEMENT).
I was thinking we can overlap like a skin the grid or the great circles and take a snapshot of the screen (adding a button to do it), and then you can make the adding of the areas. (you have the screen to backup if you want with this).
But the grid is a fine idea. If we can overlap a grid, is a great solution.
Well. I do not take more time.
I am in debt with you. (i remember i will share Dulce de Leche from Argentina), but the project didn't evolve (you help me a little but i coudn't continue because many factors -example of this the math of a stereonets)... even i debt the dulce to you
I want to share some of other projects related to compass and geological apps.
How can i contact with you? i do not want to disturb others, in others post i mean.
I have a earthquake alert app in motion, and a religious one too.
BUT i am stuck.
So...
Write me if you can.
This is an excellent app, so useful for taking a quick picture and adding your measurements. I use it all the time for even simple things around the home, buying curtains, building materials and even a table cloth. So easy to use and does a great job. Take a picture, add you sizes, got it all.
The Measure Tool lets you measure the distance between objects, between an object and a page element (e.g., a placed guide, the page centre or the page edge) or between guides. This can be done vertically, horizontally or diagonally.
The tool also lets you scale your document or the currently selected artboard by either setting a scale factor (e.g., 1:100, 1cm:1km) or by scaling to a known distance (e.g., 10 metres) on a currently measured object dimension.
i would like to measure the speed of a moving object.
the set up is going to be 2 optical sensors. and 2 laser pointers.
this will create 2 beams.
as the object pass, it will break the first beam. then the second.
the time taken to break the beams, will be stored.
with the known distance, and the measured time, the speed of the object can be calculated.
i should have mentioned this before. i am using photodiodes.
it produces voltage ranging from 0 to 5V, depending on light intensity.
hence, using the ADC to just make a threshold thats higher than ambient light, but less than laser pointer.
Using micros() instead of millis() gives 4 usec resolution on each measurement or 8 usec total. Each loop where the thresholds aren't triggered would take a little more than 32 usec. Seems like you could get 97%+ accuracy pretty easy.
Scale (zoom) the image on your screen so that the person is a simple ruler measurement tall, like 1 inch... the scale of the image is now set as 1in = 1.8m. Then measure the tree, and say it measures 5 inches... the tree is then 5 x 1.8m = 9m tall.
With Gimp you can define the image definition to about any arbitrary value, and the measure tool can display measure in the corresponding physical units. For instance in this picture the woman is about 404px high.
However, if this is valid in a few easy cases such as this one (everything nicely vertical and tree at about the same distance as the person), in most photos you will have perspective distortions that make such measurements quite impractical and inaccurate. In fact in the measure above the three is at an angle, so the 2.02m are wrong, they are the measure of the projection of the tree on the photography plane and the tree is likely somewhat bigger. In this case a better measure is along a vertical:
- Make sure the photo presents the full head from the top of the hair to the bottom of the chin
- Center the head with the frame
- The person in the photo should have a neutral expression and be facing the camera
- The top of the head, including the hair, to the bottom of the chin must be between 50% and 69% of the image's total height. The eye height (measured from the bottom of the image to the level of the eyes) should be between 56% and 69% of the image's height.
- Image pixel dimensions must be in a square aspect ratio (meaning the height must be equal to the width). Minimum acceptable dimensions are 600 pixels (width) x 600 pixels (height). Maximum acceptable dimensions are 1200 pixels (width) x 1200 pixels (height).
With the Spike laser, a compatible device, the Spike App and access to the Spike Cloud, one person can quickly get the measurements needed for signage design, permitting, quotes, planning and installation. Spike is the modern solution for gathering fast and accurate data regardless of project size or complexity, and it delivers multiple advantages that will benefit anyone:
Measurements are stored with the photo and from the Spike app the data can be shared as a PDF report, JPG, Spike File (XML), KMZ, URL, or Scaled Image or uploaded to the Spike Cloud. The Spike Cloud provides the following output options: JPG, Shareable URL, and PDF report.
ikeGPS is a leader in developing innovative solutions for rapidly obtaining accurate measurements, and we're proud to be your home for Spike laser measurement tools and product support. Our team knows our products and the industries that depend upon accurate measurements. We're happy to answer any questions you have about the product, explain our services and show you all the ways Spike will help you save time and money.Connect with us using our contact form, or give us a call at 1-844-4-IKEGPS.
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