Shape from Shading. Surface Inspection for Challenging Surfaces
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1 Shape from Shading Surface Inspection for Challenging Surfaces
2 Function Directional illumination
3 Function Diffuse illumination
4 trevista Structured and diffuse dome illumination
5 Algorithm Algorithm with 4 input images result images Slope image x direction Slope image y direction Curvature image Integration image (optional) Texture image
6 Result images Slope x direction Slope y direction Curvature Texture
7 Sequence Structured dome illumination Result images show slope and texture Test program identifies defects
8 Benefit Defects starting from few microns in height or depth can be identified Inspection of different materials (metal, ceramics, plastic ) Compensation for texture features and gloss (different material batches, lubrication ) Minimum number of pseudo defects
9 Benefit Inspection of curved surfaces Maximum part output Software algorithm optimized for multicore CPUs Calibrated system, no illumination tests required Easy Integration
10 trevista component Structured dome illumination Integrated camera mounting LED controller unit Software DLL with dongle
11 Field of view Field of view 20mm Field of view 50mm Field of view 200mm
12 Models trevista SURFACE Inspection of static parts trevista CYLINDER Inspection of cylindrical parts trevista MULTILINE Inspection of moving parts
13 trevista SURFACE Inspection of static parts Area scan camera Image capture typ ms/MPixel
14 trevista CYLINDER Inspection of cylindrical parts Rotation of part Line scan camera 2k or 4k Line frequency (4 illuminations) up to 15kHz/4
15 trevista MULTILINE Inspection of moving parts Linear movement or rotation Line length 2k Line frequency up to 10kHz
16 trevista MULTILINE Used for rotary table sorting device Simultaneous inspection of front side and back side
17 Inspection features Inspection of grooves, dents, scratches Difficult surfaces with turning marks and along edges
18 Inspection features Inspection of sealing areas Reading of stamped codes
19 Inspection features Short-wave defects visible in curvature image (non directional) Medium-wave defects visible in slope image (directional) Long-wave defects visible in integration image (non directional) Differences in brightness visible in texture image
20 Materials Metal parts of any kind and production technology (turned, milled, grinded, rolled, stamped with diffuse up to glossy reflection) Plastic, rubber Ceramic Printed circuit boars, bonding contacts
21 Parts Turned parts, rotationally symmetric parts Screws Sleeves Stamping parts Profile bars
22 Turned part Texture Slope x direction
23 Turned part Slope y direction Curvature
24 Turned part Integration Slope radial direction
25 Turned part Result images can be used in parallel (e. g. texture image is used for part tracking) Slope image in tangential direction suppresses turning marks and shows defects Slope image in tangential direction is suitable for inspection of edges Slope tangential direction Easy and reliable detection of finest defects
26 Profile bar Conventional illumination Curvature image
27 Metal sleeve Conventional illumination Curvature image
28 Summary Shape from Shading is an established technology for detecting finest defects even on challenging surfaces, in particular metal surfaces The inspection of difficult surfaces and along edges is possible using the result images which are best suited for the specific task
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