IMAGE CONPRESSING DEVICE AND IMAGE COMPANDER

Japanese Patent JP3845208

B2

PROBLEM TO BE SOLVED: To efficiently compress an image with high resolution and to compress/expand an image without any distortion.
SOLUTION: The image compressor 30 is provided with a predictive value generating section 31, a differential value generating section 32, a Hadamard transformation section 33, a quantization section 34, a bit separate section 35, a zigzag scan section 36, and a Huffman coding section 37. The prediction value generating section 31 generates a prediction value based on pixel data configuring received image data. The differential value generating section 32 generates a difference by taking a difference between the predicted value and pixel data. The Hadamard transformation section 33 applies Hadamard transformation the difference to obtain a Hadamard transformation coefficient. The quantization section 34 quantizes the Hadamard transformation coefficient to obtain a quantized Hadamard transformation coefficient. The bit separation section 35 applies bit separation to the quantized Hadamard transformation coefficient to obtain a high-order quantized Hadamard transformation coefficient and a low-order quantized Hadamard transformation coefficient. The zigzag scan section 36 applies zigzag scanning to the high-order quantized Hadamard transformation coefficient and the Huffman coding section 37 encodes an output of the zigzag scan section 36.

Gentleman Abe

JP27102198A

November 15, 2006

September 25, 1998

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Pentax Co., Ltd.

H04N1/41; H04N9/79; G06T9/00; H04N19/593; H04N19/60; H04N19/61; H04N19/91; (IPC1-7): H04N1/41; H04N7/30; H04N9/79

JP2250581A
JP2170671A
JP7111633A
JP2000013798A
JP3375539B2
JP3650527B2

Takashi Matsuura

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