A fim de abordar questões de letramento e alfabetização de crianças, em especial sob uma perspectiva semiótica que considera a multimodalidade como aspecto fundante de certos materiais, elegeremos e analisaremos um livro de “literatura infantil”, produzido por uma casa editorial brasileira, em versões impressa e digital, tratando de apontar elementos que os tornam objetos de ler multimodais, de modos diferentes, e que relações isso estabelece com o aprendizado da leitura, desde tenra infância, com a mediação do/a professor/a. A formação de professores/as também está em pauta, na medida em que é necessário pensar sobre tecnologias digitais e novas possibilidades de leitura no processo de alfabetização contemporâneo, isto é, posicionando-se no contexto atual de possibilidades/oportunidades midiáticas inescapáveis (smartphones e telas de todo tipo).
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.
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