iPhone algorithm photo capture error

According to AppleInsider , a woman in the UK was photographed standing in front of a mirror with her reflections not matching up. The error was later discovered to be not due to the image matrix but a simple computational photography error on the iPhone.

Photo shared by Tessa Coates on Instagram

The photo, posted on Instagram by British comedian Tessa Coates, was taken while trying on a wedding dress and standing in front of two mirrors. However, each version of the mirror captures a different pose. Specifically, one mirror shows her with her arms down, the other shows her hands clasped at her waist, while the real her is standing with her left arm at her side.

This was a bit of a shock to Coates. To understand the problem, one needs to know that every time the iPhone’s shutter button is pressed, billions of operations are performed in an instant to create a photo. What’s really happening here is that a flaw in Apple’s computational photography process means that the camera doesn’t realize that it’s taking a mirror image, so it treats the three versions of Coates as different people.

Coates was moving when he took the photo, so when he pressed the shutter button, multiple images were taken at once. The iPhone's algorithm then stitched the photos together, choosing the best version in terms of saturation, contrast, detail, and lack of blur.

The final composite image should be the best, most realistic representation of that moment. However, because there are mirrors, the algorithm determines which different moments are best represented in each mirror for that reflection. That's what creates three different Tessas.

This result can be seen on any iPhone and many modern smartphones due to the limitations of computational photography with mirrors.

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