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Improving accuracy of XRII image distortion correction using a new hybrid image processing method: Performance assessment
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10.1118/1.3644846
/content/aapm/journal/medphys/38/11/10.1118/1.3644846
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/11/10.1118/1.3644846

Figures

Image of FIG. 1.
FIG. 1.

A flowchart of applying an image distortion correction method (MLSMBA).

Image of FIG. 2.
FIG. 2.

Dependence of root-mean-squared difference (RMSD) of MBA between true and corresponding positions in synthetic images to control lattice size. indicates the number of rows in the control lattice, indicates the number of columns in the control lattice. In this experiment, same values of mh and nh were used. The dotted and continuous lines refer to the RMSDs on the image applied with and control point grids, respectively.

Image of FIG. 3.
FIG. 3.

The relationship between root-mean-squared difference (RMSD) of MBA between true and corresponding positions in synthetic images in dependence of the number of lines of inserted data points when using two calibration grids with and control points.

Image of FIG. 4.
FIG. 4.

Effect of sigmoidal distortion and pincushion distortion on RMSDs of the six correction methods: L1, L2, GP, CPL, MLSILS, and MLSMBA. The accuracy results were computed at all combined points (including control points and intermediate points). Two images were taken into account: and control point grids. The weights for the pincushion distortion are given above the graphs. The bigger weight corresponds to the higher pincushion distortion level. The thin dotted, dashed, and continuous lines refer to the RMSDs of L1, L2, and GP, respectively. The thin dashed-dotted line refers to the RMSDs of CPL (threshold = 1 pixel). The thick dashed-dotted line refers to the RMSDs of CPL (threshold = 0.5 pixels). The thick dotted and continuous lines refer to the RMSDs of MLSILS and MLSMBA, respectively.

Image of FIG. 5.
FIG. 5.

Comparison of image distortion correction accuracy (RMSD) for all six methods: L1, L2, GP, CPL, MLSILS, and MLSMBA, as the function of local distortion. The thin dotted, dashed, and continuous lines refer to the RMSDs of L1, L2, and GP, respectively. The thin dashed-dotted line refers to the RMSDs of CPL (threshold = 1 pixel). The thick dashed-dotted line refers to the RMSDs of CPL (threshold = 0.5 pixels). The thick dotted and continuous lines refer to the RMSDs of MLSILS and MLSMBA, respectively.

Image of FIG. 6.
FIG. 6.

Comparison of image distortion correction accuracy (RMSD) for all six methods: L1, L2, GP, CPL, MLSILS, and MLSMBA, as the function of control point localization error level. The thin dotted, dashed, and continuous lines refer to the RMSDs of L1, L2, and GP, respectively. The thin dashed-dotted line refers to the RMSDs of CPL (threshold = 1 pixel). The thick dashed-dotted line refers to the RMSDs of CPL (threshold = 0.5 pixels). The thick dotted and continuous lines refer to the RMSDs of MLSILS and MLSMBA, respectively.

Image of FIG. 7.
FIG. 7.

(a) A distorted phantom image. (b) The corresponding image corrected by using L1. (c) The corresponding image corrected by using L2. (d) The corresponding image corrected by using GP. (e) The corresponding image corrected by using CPL. (f) The corresponding image corrected by using MLSILS. (g) The corresponding image corrected by using MLSMBA.

Tables

Generic image for table
TABLE I.

Comparison of root-mean-squared difference (RMSD) and standard deviation of the measured distance distribution computed at control points, intermediate points, and all combined points of simulated images when applying six methods (L1, L2, GP, CPL (threshold = 0.5 pixels), MLSILS, and MLSMBA) using two control point grids ( and pixels), respectively. The results are expressed in pixels.

Generic image for table
TABLE II.

Comparison of root-mean-squared differences (RMSDs) and standard deviations of the measured distance distribution computed at control points, intermediate points, and all combined points of a real XRII image when applying six methods (L1, L2, GP, CPL (threshold = 0.5 pixels), MLSILS, and MLSMBA), respectively. The results are expressed in pixels.

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/content/aapm/journal/medphys/38/11/10.1118/1.3644846
2011-10-14
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Improving accuracy of XRII image distortion correction using a new hybrid image processing method: Performance assessment
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/11/10.1118/1.3644846
10.1118/1.3644846
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