Use of a Portable Microscope Combined with a Smartphone to Determine the Authenticity of Brazilian Banknotes and National Driver’s Licenses
AUTOR(ES)
Costa, Rayana A.; Vittorazzi, Bruno V.; Barbosa, Amanda P.; Rocha, Victória B. da; Brandão, Jandira M. O. B.; Lacerda Jr., Valdemar; Filgueiras, Paulo R.; Romão, Wanderson
FONTE
Journal of the Brazilian Chemical Society
DATA DE PUBLICAÇÃO
2022
RESUMO
This study proposed using a portable microscope combined with a smartphone and application (PhotoMetrix® application) to evaluate the authenticity of Brazilian banknotes (R$50 and R$100) and national driver’s licenses (NDL) through image acquisition (Samsung S7) and chemometric treatment (principal component analysis (PCA)). Six regions of the banknote were analyzed: holographic band; lower and upper tactile regions containing the number referring to the value of the note; microprints above the effigy (obverse); and numbers and the surroundings of the animal formed by microprints (reverse). For NDLs, the regions were the following: the coat of arms of the republic; the state map with microprints; optical ink variation; distorted positive microletters with technical failure; negative guilloche; typographic numbering; micro letter wire; and region with line printing. For the chemometric study with Photometrix®, we selected a region of interest (ROI) of 32 × 32 and 64 × 64 pixels with autoscaled data using the channels red (R), green (G), blue (B), hue (H), saturation (S), value (V), lightness (L) and intensity (I). We obtained excellent results for differentiating banknotes and NDLs, both by visual and chemometric analyses (PCA). This study demonstrates the effectiveness of using a portable microscope and a smartphone as a portable forensic tool that is fast, robust, low-cost and reliable.
Documentos Relacionados
- Fragile X Mental Retardation Protein in the Driver's Seat
- In the driver's seat: the Bacteroides conjugative transposons and the elements they mobilize.
- Relationship between driver's record and automobile versus child pedestrian collisions.
- A BDI-based approach for the assessment of driver's decision-making in commuter scenarios
- A NEW PORTABLE CORNEAL MICROSCOPE