iPhone algorithm photography error

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

The photo was shared by Tessa Coates on Instagram.

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

This came as quite a shock to Coates. To understand the cause of the problem, one needs to know that every time the iPhone's shutter button is pressed, billions of operations occur simultaneously to create a photograph. What actually happened here was a flaw in Apple's computational photography process where the camera wouldn't recognize that it was taking a picture in a mirror, so it treated the three versions of Coates as different people.

Coates are moving while taking photos, so when you press the shutter button, multiple different images are captured simultaneously. The iPhone's algorithm then stitches these images together, selecting the best version in terms of saturation, contrast, detail, and lack of blur.

The final composite image should be the best, most authentic representation of that moment. However, because of the mirrors, the algorithm determines which different moments displayed in each mirror are best for that reflection. This is the reason for the creation of 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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