Samsung Patents a Two-Sample Method for Detecting Light Flicker in Phone Cameras
Fluorescent and LED lights flicker at precise frequencies, and when your phone camera doesn't know what that frequency is, you get banding and pulsing in your videos. Samsung's new patent describes a way to figure that out automatically, using two quick samples at different rates instead of one.
What Samsung's flicker-detection camera trick actually does
You're filming a birthday party under the kitchen lights and the video keeps showing a weird horizontal stripe pulsing across the screen. That's light flicker, and it happens because most artificial lights cycle on and off dozens of times per second at a specific frequency your camera needs to sync with.
Samsung's patent describes a method where, as soon as you open the camera app, the phone takes two rapid brightness readings at different speeds. By comparing what each reading picked up, the phone can work out the exact flicker frequency of the lights around you, then tune the camera shutter to match it.
The result is that banding stripe disappears, or never appears in the first place. You don't change any settings; the phone figures it out on its own in the background while you're still pointing at the cake.
… acquire a first data frame by sampling brightness data acquired by the sensor based on a first sampling rate, identify a first frequency based on the first data frame, acquire a second data frame subsequent to the first data frame by sampling the brightness data acquired by the sensor based on a second sampling rate different from the first sampling rate …
Translation: The phone takes two quick light measurements at different speeds to help it figure out the flickering light source.
How two sampling rates pin down a light source's frequency
The patent describes a system built into a phone's camera app that uses a dedicated brightness sensor (separate from the main camera lens) to sample ambient light data twice in quick succession, each time at a different sampling rate (how many brightness readings per second it takes).
Here's the core idea: any artificial light source, such as a fluorescent tube or an LED panel running on AC power, pulses at a fixed frequency, typically 50 Hz or 60 Hz depending on the country's electrical grid. If you sample that light at the wrong rate, you can get ambiguous results because of a well-known signal-processing problem called aliasing (where two different frequencies can look identical if you sample too slowly).
- The first sample at sampling rate one produces a candidate frequency estimate.
- The second sample at a different sampling rate produces a second estimate.
- The processor cross-references the two estimates to resolve the ambiguity and lock in the true flicker frequency.
Once the device knows the light source's frequency, it can set the camera's exposure timing to align with the light cycle, eliminating the visible bands. The whole process happens while the camera app is already running, so no manual input is needed.
… determine a frequency of the light source based on the first frequency and the second frequency.
Translation: The device calculates the exact flicker rate of the lights by comparing the two different samples it collected.
What this means for indoor video on Samsung phones
For anyone who shoots video indoors, under office lighting, in gyms, or in shops, automatic flicker correction is one of those features that's invisible when it works and maddening when it doesn't. Getting the detection step right is the hard part, and Samsung's two-sample approach is designed to be accurate without requiring extra hardware beyond a simple brightness sensor most phones already carry.
The software-first nature of this patent means the path to a shipping feature is relatively short: the sensor hardware is already present in current devices, and the main work is in how the processor interprets the two readings. Camera-focused new tech patents like this one reflect how much competitive energy phone makers are putting into computational photography problems that users feel directly but rarely think about.
Samsung's 94th filing we've tracked since May builds on ideas like one on per-shot light storage and one on lensless reframing in our camera sensor push watch.
The ship-path here is about as short as a software patent gets. The patent calls for a brightness sensor and a processor, both of which are standard on every recent Samsung phone, so there's no new hardware dependency standing between this filing and a camera firmware update. The two-sample algorithm is the only novel piece, and it's computationally light enough to run at app launch without adding perceptible delay. If Samsung's camera team isn't already testing a version of this, the gap between filing and feature is small.
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The drawings
11 drawing sheets from US 2026/0247040 A1 · click any drawing to enlarge
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