Xiaomi caught cheating at Mi 8's DxOMark camera benchmark
At the time of writing this article, we were able to confirm the existence of references to said tuning in the same file taken from a recent version of Mi 8’s stock ROM. Digging through the file using a hex editor, we could see that there were at least 190 different references to DxOMark’s testing conditions. Some examples of the references we identified include:
3. "For DXO office table-1"
5. "DXO office Red plastic board"
(i) What we think happened:
Going by what defcomg says, we believe Xiaomi has used scene recognition data based on DxO's test scenes from past camera benchmarks (refer section (iii) for more info) to recognize those scenes when the camera was being tested and applied well tuned white balance values for those specific scenes, making the output images look close to perfect in terms of colour reproduction. That way, they would be granted high scores, as the camera would seem well tuned, while in reality only those specific scenes were tuned to near perfection. To explain in more simple terms, this is quite similar to how the so-called 'AI ' modes most OEMs these days include on their devices' camera applications work, an image recognition data model (this data model contains the key points with which to recognize an image) is used to recognize a scene and apply filters specific to those scenes so that the output image would look better than when shot normally. Only, in this case, Xiaomi has used this technique to specifically enhance the output of DxO's test scenes to manipulate scores.
We attempted to match the DxO strings with test scenes from DxO's review, to support our claims. Here are a few examples:
1. "DXO Office Yellow Wood Table"
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Image source: DxOMark |
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Image source: DxOMark |
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Image source: DxOMark |
(ii) Steps to reproduce:
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Click here to open the image in a new tab. This screenshot of Hex Workshop includes references to "For DXO office table-1", "For DXO office table-2," and "green water in DXO" |
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Click here to open the image in a new tab. This screenshot of Hex Workshop includes references to "DXO office Red plastic board" |
(iii) Why this was possible:
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DxOMark uses similar test scenes to evaluate different devices. Left: DxOMark review of the ZenFone 5, Right: DxOMark review of the Galaxy Note 9. Notice how similar the test scenes are. Click here to open the image in a new tab |
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DxOMark uses similar test scenes to evaluate different devices. Left: DxOMark review of the Mi 8, Right: DxOMark review of the OnePlus 6. Notice how similar the the test scenes are. Click here to open the image in a new tab |
Needless to say, this discovery is quite scandalous and extremely disappointing, seeing how Xiaomi aggressively promoted the alleged superiority of the Mi 8’s camera to that of other mainstream flagships and the recent announcement of the establishment of a dedicated camera department. We, at AndroGuider, hope Xiaomi and/or DxOMark acknowledge this fiasco. Also, seeing how simple it is to manipulate DxO's benchmark from this incident, who knows how many other OEM's have adopted similar practices (we are investigating!). We have reached out to Xiaomi for comments on this issue. Let us know what you think in the comments and stay tuned for updates!

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