Now it's harder. For arbitrary image, you'll have to identify where
the circle is. But Jame's answer seems fine if the ONLY thing on the
picture is the circle and the two segments. just look for the left
most intersection and the right most intersection then follow the
line.
On Jan 4, 5:15 pm,
Hi.
Ok it is a extreme solution but I will try.
thanks.
bye
On Jan 6, 2008 7:34 AM, drugz' <[EMAIL PROTECTED]> wrote:
>
> Hello Daniel,
>
> You can follow Hough Transform for line detection.
>
> These two lines from center to circumference will be become two points
> on the Hough Transform Axes.
Hello Daniel,
You can follow Hough Transform for line detection.
These two lines from center to circumference will be become two points
on the Hough Transform Axes.
By comparing the thetas(on theta axis of Hough transform) of these two
points correspondign to each line, you can find out theta r
Hi.
No. The radius that I talking about is the radius of the circumference, is
the only thing that I know in the original picture, I don´t know the angle
theta, I don´t know the intersecting points between lines and circumference.
I know that I need to find theta to calculate the arc length but I d
Which ratio are talking about ?
Do you mean, ratio of Arc length with Circumference?
On Jan 5, 8:29 pm, "Daniel Bastidas" <[EMAIL PROTECTED]> wrote:
> Hi.
>
> Sorry for my poor english, maybe I don´t explain me well.
> Ok, if A is the area of the circumference then:
> *A = PI*r^2* and *r* =
Hi.
Sorry for my poor english, maybe I don´t explain me well.
Ok, if A is the area of the circumference then:
*A = PI*r^2* and *r* = radius of the circumference as shown in figure
So a mathematic expression for the radius will be:
*r = (A/PI)^1/2*
If C is the circumference, *C = **2 * PI * r*
Hi,
By ratio of circumference, I assume L / C (i.e. the ratio of L:C)
You mentioned that you know that ratio i.e., you know L / C = k,where
k is the ratio of L to C
which impliesL = k * C
Then by the circumference formula
C = 2 * PI * r
L = k * 2 * PI * r
By any cha
ups.. sorry
When I said radio I wanted to said ratio or radius of circumference. for
clarify.
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Hi Chandra, I think that it is necessary find the angle theta, because the
arc length depends on that.
When I said radio I wanted to said ratio or dadius of circumference.
bye.
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Hi everybody.
thanks for reply.
Clarification:
1. When I said radio I wanted to said ratio of circumference. (sorry)
2. I am not solve the problem for this specific picture, I try to solve for
any picture.
Chandra could you explain me why L = k*C? I can see it.
thanks again and happy new year f
If you can scan pixels, why not just count # of pixels in the arc and
multiply by size of each pixel?
finding line intersection seems like a hard thing especially on a
scanned image like this one.
oh wait minute, it's an image... do you mean you want to find the
ratio of arc to circumference?
Hi,
I assume radio or circumference as ratio of circumference and take that
as
L / C = k , where k is the ratio of circumferece and C is the
circumference
If so then
C = 2 * PI * r
L = k * C
= k * 2 * PI * r
But I'm not sure that my assumption is right or i
It’s possible.
Scan the digital picture pixel by pixel and line by line until you find the
first line with two black pixels ( the adjacent pixels is counted as only one
),name the two pixels a1(xa1,ya1) and b1(xb1,yb2), continue scaning and you
will get a2(xa2,ya2) and b2(xb2,yb2), a3(xa3,ya
hmmm, how can u find w/o knowing theta?
otherwise, 2*pi*r*(theta/360)
On Jan 3, 2008 6:18 PM, Daniel Bastidas <[EMAIL PROTECTED]> wrote:
> Hi everybody.
>
> How can I find the arc length (L) in the picture attach if the only thing
> I know is the radio of circumference.
> I don´t know the coorden
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