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# What is the Decoder Region of Interest (ROI) setting used for?

You can use this feature to specify the exact region of the image the reader will use to locate and decode a symbol. This can be helpful if two Data Matrix codes are in close proximity to each other and you need to ensure you only read the code along the target aiming line. Reducing the region of interest does not necessarily reduce the decoding time or increase the image transfer rate.

NOTE: Some image related properties (eg. image size, filtering) cannot be altered when the device is acquiring or decoding images.

NOTE: For the DM580, DM380 series, the Decoder Region of Interest (ROI) is always equal to the Imager Field of View (FoV), and you cannot set it independently.

Note: default, DM050, DM060, DM070, DM080, DM150, DM260, DM280, DM290, DM300, DM360, DM370, DM380, DM390, DM470, DM503, DM580