怎样读取刻度盘指针值？

[myak6647]

各位高手，如附件图示，有一张刻度盘的图片，要怎样来读取出当前指针值？有没有相关的例程来学习学习？

[muks]

Please try posting in english here

Translation

such as the attachment icon, there is a dial pictures, How to read out the current pointer value? There is no relevant routines to learn about learning?

[muks]

There are many ways by which you can achive the pointer position.

1. Apply processing. like laplacian filter. Threshold. Extract the pointer position. Prepare a lookup table based on the position of the pointer.

I feel this will give you consistency 

2. Find the pointer position and extract the portion with respect to pointer.

[muks]

Check this vi

[muks]

Vision assistant script

[muks]

Note only one edge is found as the result. Take the edge co-ordinates to know the position.

[muks]

Helped?any update?

[myak6647]

muks ,Thank you very much!

I have checked your clock.vi.

This vi read out the pixel value of the pointer,but what i want to read out is the angle of the pointer.

[myak6647]

muks,any suggestion?

[muks]

One quick suggestion would be to make sure the successive images doesnt differ much in terms of its position and draw a line (in the centre). With respect to this you can find the angle using particle analysis. Lemme work on it a little bit for sugesting something better