Sony Corporation

Mikiko Hama

Takeshi Harano

Miyuki Okada

Isao Kawanishi

A simple compression and decompression method provides excellent effects by reducing the storage capacity of an image memory, while adapting to the properties of image. On the basis of luminance information extracted by a luminance extraction blocka compression conversion rule setting blocksets a compression conversion rule to a compression conversion tableIn accordance with this compression conversion rule, an image compression blockcompresses original image data and holds the compressed image data in an image memoryalong with a type of the compression conversion rule. This type of the compression conversion rule held in the image memoryis extracted by a decompression conversion rule setting blockIn accordance with this type, a decompression conversion rule is set to a decompression conversion tableIn accordance with the decompression conversion rule set to the decompression conversion tablean image decompression blockdecompresses the compressed image data held in the image memory

Image processing device

A high-frequency integrating circuitdetects characteristics of horizontal high-frequency components and vertical high-frequency components of the image formed by a processing-target image signal. Based on the detection result, a CPUobtains the number of bits of the after-compression-coding data of the image signal, and calculates the compression rate dependent upon the number of bits. The CPUcontrols an image codecso that the processing-target image signal is compression-coded through only one time of compression coding processing by use of the calculated compression rate. This configuration allows the image compression processing (compression coding) to be rapidly executed with high accuracy.

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Tokyo, Japan

Mikiko Hama