CamCyclopedia
Moiré in digital camera
When you take photos of a monitor or a smartphone screen, the resulting picture has an unflattering wave or ripple pattern. This is called moiré.
‘Aliasing’ takes place when there is a difference between the color filter array of the camera and the placement of the display grid [1]. You frequently experience this phenomenon taking pictures of a criss-cross insect screen or fabrics with a grid pattern.
Moiré can also result in a distorted photo when the camera is unable to focus in the preview frame because of the rolling in the wave pattern.
Below, you can see the moiré formed while clicking the photo of a monitor screen.
Detecting Moiré in Galaxy Camera
Galaxy camera has developed and applied a technology to detect this and remove any faltering in focus attributed to the wobbly wave pattern [2].
The wave patterns resulting from moiré can have some unusual colors on top of having varied and complex forms of detail. We have collected moiré pictures that can occur in multiple environments and trained an AI model to detect this.
We have used a trained AI model in the Galaxy camera photo mode to detect any moiré (moiré Pattern Detection) and optimized the Auto Focus algorithm for the camera to focus on a subject stably.
Removal of Moiré pattern using remaster picture in Galaxy
We are also using the moiré pictures clicked in different setups in training an AI model to remove the same.
The AI model needs about a couple of seconds to remove all the complicated wave patterns from a picture (Image Demoireing).
Hence, this is supported in ‘Remaster picture’ to remove the moiré in the frames captured, instead of in-camera preview which demands quick processing. It is shown below [2].
- Gallery > Click on the picture with Moiré > Click on the three verticals dots (view more) on the bottom right > Click on "Remaster picture " > Remastering picture... > Save
The below image is after the removal of moiré in the picture using ‘remaster picture’.
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Reference
[1] Journal of Broadcast Engineering Issue 26 first edition, Jan 2021 (Technique to removing moiré pattern in captured frames using multi-domain learning)
[2] This is deployed in some models like the Galaxy S22, Z Fold 4, Z Flip 4, etc.
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