[Q] Make APP - Optical Tachometer (Helicopter etc) - General Questions and Answers

Hi all, Got a Desire HD and a radio control helicopter (Trex 500).
Would like to be able to look at the heli in flight with the camera (in video mode is ok) and see what speed the rotors are spinning at.
All that's required is a method of adjusting the camera shutter speed while pointing at the heli until the blades look stationary. (Maybe use the volume rocker for adjustment)
Also a little routine to put the revolution figures on screen.
The heli blades should spin at about 2700rpm but for a wider variety of helis, would like to read a range from about 1900 to 3200 rpm.
A shutter harmonic frequency could be used as I dont think the shutter can operate at these speeds.
There are units available that use this method... But the mobile phone with camera already has the hardware needed. Just need a little bit of programming, I'm guessing.
If anyone can help i'm sure there would be a lot of interest from various fields....
Feedback on the idea welcome.....
aero star
PS. Thinking of existing measuring apps available, any reason why shutter speed can't be added to give object speed calculation and result etc etc
PPS Recording the heli in flight and then applying the Tachometer software would be ok.... might be easier to adjust the shutter speed for the video recording... ???

Related

OMG I know how to increase video recording FPS to 25!!

Trust me this works, I just found this out right now and had to tell you guys. All you do is lower the brightness in the settings. You'll notice right away that as you keep lowering the brightness the framerate starts increasing. Just jitter your hand while you lower brightness.
I also strongly suggest you lower the contrast(to 1 or 2) in the camera settings to brighten up shadows.
Great. The brightness itself doesn't seem to suffer as it compensates the brightness somehow and the fps is nicceee
D: Brilliant! Well, at least that lessens my dissapointment in my TP xD
This really works. Thank you man.
I just tested it out by recording 2 videos. One at normal brightness, and one with 0 brightness.
The zero brigthness is CLEARLY more fluid. HTC you suck for not giving us good frame rates out of the box. Also lowering the brightness level doesn't seem to actually make the video much darker.
What!!? I can't believe this works!! It's awesome!
Now we just need a program to change the backlight up and down when the camera app is open/closed!
What is the framerate if you dont do this?
I made those adjustments and it makes the shadows appear VERY grainy.
Are you talking about fps in preview mode or does it actually change the fps when recording video?
Thanks.
Cool, I'll try it as soon as I get home.
do you mean i have to put brightnes to 9 o to the lower possible value (-1.5)?
TNX
is there a chance to do that in the xperia x1?
My recordings are still 18fps after doing this, but the video is much smoother when recording in low light areas (which is pretty much anywhere in-doors).

[Q] Camera: set iso, shutter speed etc?

Hi, as you all know fuze/TP cam is good when there is a lot of light but sucks with low light.
So:
- is there a way/app to manually modify ISO or shutter speed?
- is there a way to deactivare autofocus?
- is there a way set focus to infinite so it does not have to focus every time?
- is there an alternative apps for taking pictures?
Thank you

[Q] API for precisely modifying shutter speed, ISO, and aperture as exactly as I want

For the research purpose, I need to be able to control the shutter speed precisely without affecting or changing the ISO or the aperture. The shutter speed needs to vary from 10ms to 2000ms, with a step of 10ms. So that means there needs to be 200 different options for shutter speed, and so far the best apps for android phone just offer a few, and still they cannot keep the values of the aperture and the ISO the same in all images. I really wish that they can make the app in a way that I can plug in number for my shutter speed, ISO and aperture, and they have to maintain the same values no matter when or where I take a photo; for instance 1.27 seconds for exposure time, f/1.42 for aperture, 800 for ISO. I've been thinking about program my own app, but I have no idea how to start. I don't even know if it is possible to program an app that can really allow us to plug in numbers for the shutter speed, ISO, and aperture precisely in millisecond. Is there any idea?

How to make a camera app question?

What developer's software is needed to make a camera app for Android?
I'd like to incorporate studio flash heads that work via the wireless transmitters on normal DSLR cameras. Maybe some signal to the headphone jack that could feed a wireless flash trigger prior to the shutter tripping?
There likely is some timing issue as well as exposure control, but if the flash units are just used for a fill light the exposure shouldn't be that much different than normal other than maybe a +/- control of a few stops (or shutter speed and/or ISO change since there are no f/stops in the cells). Why this isn't on any cell app is beyond me as it seems simple in general since the wireless triggers are already out there.
Tia.

Playback Speed Slider

I notice that the playback speed control has changed from step change buttons to a slider. While this is good for large jumps in speed it offers no fine control especially on a small screen.
Please bring back the ability to finely control the playback speed. %5 increments were perfect.
Perhaps a setup option to use a slider or the previous button style would be useful.
Or buttons with the slider.
FYI. For certain videos I prefer a 115% payback speed which was easily achieved when each video started. Now it is frustrating to try to get near the required playback speed with the slider. It's made the MX player experience a little worse unfortunately.

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