Método de ocultamiento de píxeles para esteganografía de imágenes en escala de gris sobre imágenes a color
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Keywords
BPHM, QIM, esteganografía, imperceptibilidad, calidad de la imagen recuperada
Resumen
El proceso de ocultar datos secretos dentro de una señal huésped se conoce como esteganografía; sus parámetros de diseño son la imperceptibilidad, la capacidad de ocultamiento y la calidad de los datos recuperados. En el caso de imágenes, uno de los métodos existentes basado en la modicación de los píxeles de la imagen huésped es el denominado BPHM (Block Pixel Hiding Method), el cual presenta una buena imperceptibilidad y alta capacidad de ocultamiento, pero no garantiza la calidad de la imagen secreta recuperada. Este artículo propone un método que mejora los resultados de BPHM basado en la selección de banda y un algoritmo de búsqueda global denominado IPHM (Improved Pixel Hiding Method). De acuerdo a las simulaciones realizadas, los resultados obtenidos con IPHM son mejores a los obtenidos con BPHM y son similares a uno de los métodos más populares en esteganografía de imágenes conocido como QIM (Quantization Index Modulation).
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Referencias
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