Electronic speckle interference fringe pattern phase information extracting method
Electronic speckle interference fringe pattern phase information extracting method
 CN 104,268,837 B
 Filed: 09/26/2014
 Issued: 08/21/2018
 Est. Priority Date: 09/26/2014
 Status: Active Grant
First Claim
1. electronic speckle interference fringe pattern phase information extracting method, using laser interference and image processing equipment as test platform,It is characterized in that, extracting phase information using partial differential equation, include the following steps：
 Step 1：
A width electronic speckle interference fringe pattern is inputted in image processing equipment as I；
Step 2：
Extract the skeleton line of the stripe pattern；
Step 3：
Humancomputer interaction carries out series calibration to skeleton line：
First set a certain fringe order n, the maximum difference of adjacent stripesSeries is ±
1, is 1 to peak valley direction wherein being+1 to summit direction；
The fringe order set is multiplied by π
, recovers bonePhase value on stringing, using the result figure after the phase value recovered on skeleton as the input picture u before phaseinterpolation；
Step 4：
Assuming that the size of image u is M ×
N, u_{i,j}For the gray value at (i, j) point, wherein 1≤
i≤
M, 1≤
j≤
N；
Time step is Δ
t, iterations n, in the evolutionary process of equation, t_{n}Evolution maps u (i, j, the n Δ
s of=n time Δ
tsT) it is expressed asIt is calculated with a forward difference, i.e.,Construct the difference of heat transfer diffusion equationFormat is：
Chinese PRB Reexamination
Abstract
The invention discloses a kind of methods of electronic speckle interference fringe pattern phase information extraction, including：1）A width electronic speckle interference fringe pattern picture is inputted in image processing equipmentI；2）Extract the skeleton line of the stripe pattern；3）Humancomputer interaction carries out series calibration to skeleton line, using this result figure as the input picture before phaseinterpolationu；4）Setting time steplengthAnd iterationsn；5）Difference scheme based on abovementioned heat transfer diffusion equation and energy correction condition, find out imageuThe numerical solution of each pixel；6）When the maximum iteration for reaching settingnWhen numerical solution be phase image after interpolation；The present invention can be widely used in the acquisition of electronic speckle interference fringe pattern phase information.
1 Claim

1. electronic speckle interference fringe pattern phase information extracting method, using laser interference and image processing equipment as test platform,It is characterized in that, extracting phase information using partial differential equation, include the following steps：

Step 1：
A width electronic speckle interference fringe pattern is inputted in image processing equipment as I；Step 2：
Extract the skeleton line of the stripe pattern；Step 3：
Humancomputer interaction carries out series calibration to skeleton line：
First set a certain fringe order n, the maximum difference of adjacent stripesSeries is ±
1, is 1 to peak valley direction wherein being+1 to summit direction；
The fringe order set is multiplied by π
, recovers bonePhase value on stringing, using the result figure after the phase value recovered on skeleton as the input picture u before phaseinterpolation；Step 4：
Assuming that the size of image u is M ×
N, u_{i,j}For the gray value at (i, j) point, wherein 1≤
i≤
M, 1≤
j≤
N；
Time step is Δ
t, iterations n, in the evolutionary process of equation, t_{n}Evolution maps u (i, j, the n Δ
s of=n time Δ
tsT) it is expressed asIt is calculated with a forward difference, i.e.,Construct the difference of heat transfer diffusion equationFormat is：

Specification(s)