Abstract
There is provided detecting modification of optically active cellulose-based film. A method comprises split refracting or split reflecting (302) light received by a surface pattern of an optically active cellulose-based film into a plurality of output light patterns, wherein an output light pattern is determined from the plurality of output light patterns on the basis of a modification applied to the optically active cellulose-based film.
Patent family as of 17.6.2022:
CA3160187 AA20220504CA2020316018720201105
FI129618 B20220531FI2019000595220191105
FI20195952 A20210506FI2019000595220191105
WO21089921 A120210514WO2020FI5073120201105
Link to current patent family on right
Original language | English |
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Patent number | FI20195952 |
IPC | G06T 7/ 00 A I |
Priority date | 5/11/19 |
Publication status | Published - 6 May 2021 |
MoE publication type | H1 Granted patent |