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The feature was implemented to fix issues like #282. You run into this in matrix/2D barcodes, when the module size of the symbol is larger than 8x8 pixels and are using the I don't see an issue with stating that |
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Thanks for clarifying and pointing me to that issue. It wasn't clear to me that downscaling, itself, was stable and fully supported. |
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Looking at ReaderOptions.h, the downscaleThreshold and downscaleFactor properties say " WARNING: this API is experimental and may change/disappear". However, the tryDownscale property does not. The default is for tryDownscale is true, which seems strange for an experimental API.
I have a simple QR Code (set to "QR code we are") that is 21mm (~7/8") square on the page; it is not rotated and is printed very clear. The barcode is not detected unless tryDownscale is true. It is found when at pyramid level 2. When I have other barcodes (e.g. 128, 3of9, PDF), they are detected just fine when tryDownscale is set to false; whether they are 'normal' size or smaller.
I'm looking for more details on the purpose of Downscale.
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