Business Context
A manufacturing plant produces electronic circuit boards. To ensure quality consistency, the system must verify that each newly manufactured board (Source) matches the 'Golden Master' board (Reference). The goal is to detect significant visual defects or misalignments using the Structural Similarity Index (SSIM).
Data Preparation
Simulation of image data loading. We create two tables: 'PRODUCTION_LINE' (Source) and 'GOLDEN_MASTER' (Reference) containing binary image placeholders and file paths.
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| 1 | DATA casuser.production_line; |
| 2 | LENGTH _path_ $255 _image_ $1024; |
| 3 | INPUT _path_ $; |
| 4 | _image_ = '010101'b; /* Simulated binary image blob */ |
| 5 | DATALINES; |
| 6 | board_a1.jpg |
| 7 | board_a2.jpg |
| 8 | board_a3.jpg |
| 9 | ; |
| 10 | RUN; |
| 11 | |
| 12 | DATA casuser.golden_master; |
| 13 | LENGTH _path_ $255 _image_ $1024; |
| 14 | INPUT _path_ $; |
| 15 | _image_ = '010101'b; /* Simulated binary image blob */ |
| 16 | DATALINES; |
| 17 | board_a1.jpg |
| 18 | board_a2.jpg |
| 19 | board_a3.jpg |
| 20 | ; |
| 21 | RUN; |
Étapes de réalisation
1
Verify input tables are loaded correctly in CAS.
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| 1 | PROC CAS; |
| 2 | TABLE.tableInfo / caslib='casuser' name='production_line'; |
| 3 | TABLE.tableInfo / caslib='casuser' name='golden_master'; |
| 4 | RUN; |
2
Execute image comparison using default SSIM method, matching images by file path.
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| 1 | PROC CAS; |
| 2 | image.compareImages / |
| 3 | sourceImages={TABLE={name='production_line', caslib='casuser'}} |
| 4 | referenceImages={TABLE={name='golden_master', caslib='casuser'}} |
| 5 | casOut={name='defect_report', caslib='casuser', replace=true} |
| 6 | method='SSIM' |
| 7 | pairOnPath=true; |
| 8 | RUN; |
Expected Result
A 'defect_report' table is generated containing SSIM scores for each circuit board. High scores (near 1.0) indicate a pass, while lower scores trigger a manual review.