FT-04: Lighting

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Category: Light · Time: about 15 minutes · Run it and see results: https://openckey.org/tests/test?id=FT-04

What it checks

A printed CKey reads in daylight, ordinary indoor light, dim light and under a reflection.

Why

Low light adds noise and blur, warm light shifts colour, and glare washes out part of the code. The certification model includes noise and glare; this checks it against real rooms.

Test codes

Print or open the sheet at https://openckey.org/tests/sheet?id=FT-04. It is drawn by the CKey web SDK from the values below.

Set up

1. Print the test sheet at 100% scale; the code is 2.0 inches wide.
2. Keep the phone about 25 cm from the sheet with the flash off.

Steps

1. Try the code in each condition: outdoor daylight (not direct sun on the screen), ordinary indoor light, a dim room lit by one distant lamp, warm lamp light close by, and with a bright reflection crossing part of the code (glossy paper or a sheet protector under a lamp).
2. Allow up to 5 seconds in each.
3. Record whether it read, and optionally the light level from a light-meter app.

What to record

• Read within 5 seconds, boolean, required. For each of: Daylight, Indoor, Dim, Warm lamp, Reflection.
• Light level, if measured (lux), number, optional. For each of: Daylight, Indoor, Dim, Warm lamp, Reflection.

Every report also records the device, operating system, reader and its version, and the printer or screen.

How to grade it

• Pass: It read in daylight, indoor, dim and warm light.
• Partial: It read in daylight and indoor light only.
• Fail: It did not read in ordinary indoor light.

Report a result

• On openckey.org: https://openckey.org/tests/test?id=FT-04, with optional photos.
• On GitHub: open a field-test report and choose FT-04.

Both are published together at https://openckey.org/tests and as JSON at https://openckey.org/api/field/results.