Arbitrary-ratio image resizing using fast DCT of composite length for DCT-based transcoder.
IEEE Trans Image Process
; 15(2): 494-500, 2006 Feb.
Article
en En
| MEDLINE
| ID: mdl-16479819
ABSTRACT
We propose a fast arbitrary-ratio image resizing method for transcoding of the compressed images. The downsizing process in the discrete cosine transform (DCT) domain can be implemented by truncating high-frequency coefficients, whereas the upsizing process is implemented in the DCT domain by padding zero coefficients to the high-frequency part. The proposed method combines a fast inverse and forward DCT of composite length for arbitrary-ratio upsizing or downsizing. According to the resizing ratio, truncating the high-frequency coefficients and padding zeros are appropriately considered by combining the inverse DCT and forward DCT. The proposed method shows a good peak signal-to-noise ratio and less computational complexity compared with the spatial-domain and previous DCT-domain image resizing methods.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Grabación en Video
/
Algoritmos
/
Redes de Comunicación de Computadores
/
Procesamiento de Señales Asistido por Computador
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Interpretación de Imagen Asistida por Computador
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Aumento de la Imagen
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Almacenamiento y Recuperación de la Información
Tipo de estudio:
Evaluation_studies
Idioma:
En
Revista:
IEEE Trans Image Process
Asunto de la revista:
INFORMATICA MEDICA
Año:
2006
Tipo del documento:
Article