Divide edges into equal distance points

model · 2011-10-31 09:37:56

Hand segmented Image : http://imm.io/b0yr

FI i have edges points like presented in the image .
then for example one edge have 100 distance from its start point to end point . how can i divide an edge into 10 equal distance points ?

bobbym · 2011-10-31 09:55:22

Hi model;

If you mean between two red dots? I would draw a straight line between them and divide that into 10 parts.

model · 2011-10-31 10:11:00

ok how ? can you please do it and tell me by calculation and drawing , thanks

bobbym · 2011-10-31 10:15:14

Hi;

First, I would have sampled more points than 20 but...

You need first to overlay that image over some graph paper. This you can do manually or by using a program.

model · 2011-10-31 10:19:00

I think i need to find the distance like

dis = sqrt( ( x1 - x2 )^ 2 + (y1 - y2)^2 )

and then for dividing this distance into 10 parts ,. how / ?
I am not catching small small work .

bobbym · 2011-10-31 10:21:38

Hi;

To do that you still have to follow my steps. In other words it has to mapped to a cartestian coordinate system to use the distance formula.

model · 2011-10-31 10:23:39

now how can i make Cartesian coordinates system here for showing the distance formula .

bobbym · 2011-10-31 10:28:42

That is what I am talking about. If you overlay the image of the hand on top of a grid system of xy coordinates. Then each red dot will have an xy coordinate. Then the distance formula can be applied.

model · 2011-10-31 10:30:43

IS there any online graph and equation editor that help me to draw things that i want .

thanks

bobbym · 2011-10-31 10:37:24

Hi;

That is a good question! Possibly this:

http://pixlr.com/editor/

Or:

You should have some editor on your machine. Irfanview, Faststone viewer, The gimp or inkscape are all good freeware programs.

TMorgan · 2011-10-31 10:41:24

Model,
Do you have the X and Y coordinates of the red points?

model · 2011-10-31 10:43:04

Hi TMorgan ,

yes I have ./ .
I do't understand how to divide a straight line from two points into 10 equal distance . This same i have to do with all edges .

Last edited by model (2011-10-31 10:44:00)

bobbym · 2011-10-31 10:44:59

Why did you not tell me you have xy coordinates?

model · 2011-10-31 10:46:22

well i said edges points . and edge made by two vertex . so .. i think i do't need to mention that i have x and y of an edge .

In fact the image that i posted ,. i have hand contours that mean edges where edges made by two vertax , so that is clear,

Point here is i need to get equal distance between edges . for that i need to divide say all edges should be divide into 10 equal distance part .

how can i divide into 10 distance equal parts ?

Last edited by model (2011-10-31 10:49:50)

bobbym · 2011-10-31 10:49:06

Then you do not need to map the image to a cartesian grid. Please provide the coordinates.

model · 2011-10-31 10:51:56

Hand vertex Points :

x 416    y 434
x 410    y 444
x 420    y 453
x 449    y 460
x 456    y 469
x 468    y 473
x 479    y 469
x 465    y 457
x 403    y 423
x 396    y 427
x 398    y 436
x 394    y 444
x 398    y 446
x 407    y 434
x 407    y 425

bobbym · 2011-10-31 10:53:04

The drawing shows 19 red points. Your list has 15?

model · 2011-10-31 10:53:45

TMorgan wrote:

Model,
Do you have the X and Y coordinates of the red points?

thanks Sir . . May be i did not write question in good and understandable form .

model · 2011-10-31 10:57:24

bobbym wrote:

The drawing shows 19 red points. Your list has 15?

Well , that i supposed . also vertex points can be change i meant increase or decrease depend on my hand postures .

so more postures , may be create more edges . so more vertex . btw, in the above image i just suppose that logically those should be my vertex .

TMorgan · 2011-10-31 11:02:48

I thought you might since you suggested the distance formula.
You are going to add 9 in between points between each consecutive pair of points.
dX = X2 - X1
dY = Y2 - Y1
X coordinates of in between points = X1 + (dX/10); X1 + 2(dX/10); X1 + 3(dX/10)....
Same for Y coordinates.

model · 2011-10-31 11:06:47

TMorgan wrote:

I thought you might since you suggested the distance formula.
You are going to add 9 in between points between each consecutive pair of points.
dX = X2 - X1
dY = Y2 - Y1
X coordinates of in between points = X1 + (dX/10); X1 + 2(dX/10); X1 + 3(dX/10)....
Same for Y coordinates.

Sir can you please explain the method graphically too .

Thanks alot ./

TMorgan · 2011-10-31 11:09:27

Bobby,
Sorry to jump in on you, I just had a feeling you 2 were not quite on the same page.

model · 2011-10-31 11:11:11

TMorgan wrote:

Bobby,
Sorry to jump in on you, I just had a feeling you 2 were not quite on the same page.

What do you mean ?

Do you wanna say that my question is not clear to you too .

bobbym · 2011-10-31 11:19:23

Hi;

I do not mind any jumping in.

Your question was always clear to me as long as we either get or have the xy coordinates.

I still require the coordinates of each red dot. Or a means to calculate them.

TMorgan · 2011-10-31 11:19:46

Model,
I am new here and not yet profficient with the Latex language or posting charts. I can ask you to think of the 2 points you want to connect. There is a horizontal (X) and vertical (Y) distance between them. Like if you had to go from one to the other but you can only go straight up or down and straight sideways. You break each of those distances into 10 parts and take one step at a time. Each step takes you 1/10 of the way to the next point. The 10th step would be
X1 + 10(dx/10) = X1 + dX which by definition is X2.
Suppose your 2 points are at the origin (0,0) and at (10,10). Can you see how your in between points would be (1,1), (2,2), (3,3)... and how that fits into the equation I gave?
One of the more experienced people here hopefully can make you a graph.

Math Is Fun Forum

#1 2011-10-31 09:37:56

Divide edges into equal distance points

#2 2011-10-31 09:55:22

Re: Divide edges into equal distance points

#3 2011-10-31 10:11:00

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#4 2011-10-31 10:15:14

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#5 2011-10-31 10:19:00

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#6 2011-10-31 10:21:38

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#7 2011-10-31 10:23:39

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#8 2011-10-31 10:28:42

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#9 2011-10-31 10:30:43

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#10 2011-10-31 10:37:24

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#11 2011-10-31 10:41:24

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#12 2011-10-31 10:43:04

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#13 2011-10-31 10:44:59

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#14 2011-10-31 10:46:22

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#22 2011-10-31 11:09:27

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