A fixed camera, small presentation changes, very different streaks (inspecting reflective surfaces for scratches)

OscarAbbott0010 · 10 Jul 2026, 20:37 UTC

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OS
OscarAbbott0010
Our planned inspecting reflective surfaces for scratches in a robot-presented camera station has Fairino FR5 presenting a polished metal cover to a fixed camera. The example images contain bright streaks that shift with small presentation differences, yet those streaks are being labelled as scratches. Before commissioning, I'd like to establish reliable references and image conditions for threshold tuning.

21 replies

FE
FelixBarnes0545
Replying to OscarAbbott0010

Check whether the suspected scratches were confirmed on physical samples under the agreed appearance procedure. Link each image to its sample identity and inspection result first.

9 points
OS
OscarAbbott0010
Replying to FelixBarnes0545

Some labels came from the pictures alone. We still have the samples, but those labels aren't tied to physical inspection results. That's irritatingly circular.

13 points
FE
FelixBarnes0545
Replying to OscarAbbott0010

Keep the image-only labels uncertain pending physical inspection. A controlled comparison of lighting and presentation can then investigate whether the moving streaks indicate reflection effects.

6 points
LE
LeahBennett0756
Replying to FelixBarnes0545

A scratch's visibility can change with presentation too. Don't let 'moving streak' quietly become the rule for relabelling something acceptable.

-4 points
FE
FelixBarnes0545
Replying to LeahBennett0756

You're right to qualify that. The streak behaviour motivates an imaging investigation; it doesn't replace physical classification under the agreed inspection procedure.

19 points
NA
NaomiBaker0506
Replying to FelixBarnes0545

So uncertain isn't the same as good? Where do those images go?

4 points
FE
FelixBarnes0545
Replying to NaomiBaker0506

Keep them explicitly undecided, with the sample link. Don't use them as confirmed examples of either class until the physical review settles them.

8 points
OS
OscarAbbott0010
Replying to FelixBarnes0545

Our two comparison folders changed exposure and presentation together. I can't tell which change made the images look better. That comparison needs a caveat too.

4 points
YA
YasminAdams0093
Replying to OscarAbbott0010

On my inspection setup, a folder called 'better lighting' also contained easier samples. The folder name was doing a lot of unearned work

17 points
OS
OscarAbbott0010
Replying to YasminAdams0093

@YasminAdams0093 What did you keep beside each image? I can manage sample ID and settings, but I don't want a form nobody fills in.

15 points
YA
YasminAdams0093
Replying to OscarAbbott0010

On my setup we kept sample ID, exposure, lighting arrangement and presentation condition. Enough to explain a comparison without reconstructing the whole session from memory

8 points
FE
FelixBarnes0545
Replying to YasminAdams0093

@YasminAdams0093 Those records can support the vision specialist's comparison of image conditions. Holding the representative sample set constant will make an acquisition change easier to assess.

19 points
NA
NaomiBaker0506
Replying to FelixBarnes0545

Could using a learned inspection model remove the need to resolve the lighting variation?

15 points
FE
FelixBarnes0545
Replying to NaomiBaker0506

Any learned model still depends on reliable labels and representative evaluation. Changing the method doesn't resolve unconfirmed physical defects or an uncontrolled comparison of image conditions.

19 points
LE
LeahBennett0756
Replying to FelixBarnes0545

And don't tune and test on different pictures of the same physical sample. That isn't the independence the result would suggest.

10 points
OS
OscarAbbott0010
Replying to LeahBennett0756

I'll keep all images of one sample together when we split tuning and evaluation sets. Our file names alone wouldn't have caught that overlap.

8 points
FE
FelixBarnes0545
Replying to OscarAbbott0010

Use the held-out samples to report defect misses and false rejections independently. A combined agreement figure can conceal the type of error that matters to the process.

11 points
OS
OscarAbbott0010
Replying to FelixBarnes0545

Should undecided physical samples count as misses in that report? I don't want them quietly disappearing just because they're awkward.

14 points
FE
FelixBarnes0545
Replying to OscarAbbott0010

Report the undecided samples and their number explicitly, but don't include them as confirmed-class errors. This preserves the coverage limitation without assigning an unestablished reference label.

10 points
OS
OscarAbbott0010
Replying to FelixBarnes0545

The reference problem is clearer, but I still can't judge inspection performance from our example images. The physical labels and image comparisons need more work.

17 points

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