Hi all.
I want to create an application using which I can measure waist of any human being.
But I am not able to identify how to perform such kind of thing. I may can use ACCELEROMETER but how to use it or else if any kind of another logic any one can suggest me so that I can create such kind of application.
thanks in advance
Use a tape measure?
I really think you're using the wrong tool for the job.
The height of an iPhone is 115.2mm.
Place the iPhone horizontally on the waist in question so that one end lines up with the belly button.
Mark the position of the other end with your finger and then move the iphone horizontally so that the first end now lines up with your finger.
Repeat until the iPhone has circumnavigated the waist.
Multiply the number of times you moved the iPhone by 115.2mm to get the waist measurement with a possible maximum error of 115.2mm
Edit in response to comment:
-(double) measureWaist: (Waist*) waistToBeMeasured iPhone: (IPhone*) iPhone
{
Finger* finger = [[Finger alloc] init];
[iphone setOrientation: horizontal];
[iphone placeOnWaist: waistToBeMeasured alignBottomWith: [waistToBeMeasured bellyButton]];
size_t i = 0;
while (![iPhone overlaps: [waistToBeMeasured bellyButton]])
{
i++;
[finger placeOnWaist: waistToBeMeasured alignLeftEdgeWith: [iPhone topEdge]];
[iphone placeOnWaist: waistToBeMeasured alignBottomWith: [finger leftEdge]];
}
[finger release];
return [iPhone height] * i;
}
Preconditions: user has iPhone.
Postconditions: user has waist measurement. Tailor has iPhone.
Alternative scenarios:
1a. User cannot find a tailor. 3a. Tailor already has enough iPhones. 4a. User mugs tailor and re-acquires iPhone.
Request for code:
NSError *error = nil;
Tailor *myTailor = [[StaffLocator defaultLocator] locateStaff: GLStaffKindTailor error: &error];
if (!myTailor) {
//handle error
}
BOOL acceptsOffer = [myTailor makeOffer: [UIDevice currentDevice] forService: @selector(measureWaist:) error: &error];
if (!acceptsOffer) {
// handle rejection
}
CGFloat waistSize = [myTailor measureWaist: self];
myTailor.iPhone = [UIDevice currentDevice];
return waistSize;
Since humour clearly isn't doing the job, here is another answer:
Using the three-axis accelerometer and gyroscopes on the iPhone 4 you can in theory describe the path in space that the iPhone moves, and then integrate that path to find its length. If the user stands still while moving the iPhone around his/her waist then the waist circumference could be measured. Note that I write 'in theory', because the implementation of such navigation is complicated. Estimate a few weeks to do it, rather than the 5-10 minutes most people are willing to part with to post a reply on Stack Overflow.
If you are determined to go ahead with it, here are a few tips: a. require that the user end up with the iPhone in the same place. Should be obvious of course, but this also gives you a bound on the path that the iPhone took. b. noise from the sensors will be a problem, since you are integrating the response once (for the gyros) or twice (for the accelerometers). I have no idea how the iPhone performs. Point (a) above will alleviate the problem but not get rid of it completely.
You can do this using the camera.
Ensure that the human waist is next to some object of known length, such as a tape measure laid out straight, and that they are both equidistant from the camera lens.
Take a photo of the two together and use image recognition to pick out both objects. Determine how many pixels long the tape measure is, and how many the waist is. Use the following code:
CGFloat diameterOfWaistInCentimetres = lengthOfTapeMeasureInCentimetres / lengthOfTapeMeasureInPixels * diameterOfWaistInPixels;
CGFloat approxCircumferenceOfWaistInCentimetres = 2 * PI * diameterOfWaistInCentimetres;
Good luck with your app! Don't forget to mention in the App Store description that a tape measure will also be required.