Image signal processing device
First Claim
1. An image signal processing device, comprising:
- orthogonal transformation means for applying an orthogonal transformation to original image data comprising at least one image component to obtain orthogonal transformation coefficients corresponding to predetermined spatial frequencies for each image component, said original image data comprising a first, a second, and a third image component;
quantization means for quantizing said orthogonal transformation coefficients, comprising quantization tables including quantization coefficients to obtain quantized orthogonal transformation coefficients;
first inverse quantization means for inversely quantizing said quantized orthogonal transformation coefficients to obtain restored orthogonal transformation coefficients;
error data producing means for obtaining quantized error data of a difference between said restored orthogonal transformation coefficients and said orthogonal transformation coefficients for each image component;
encoding means for encoding said quantized error component and said quantized orthogonal transformation coefficients to form a compressed image data;
error data synthesizing means for arranging said quantized error data into unit data of a fixed length for each same spatial frequency of components so as to synthesize a fourth component, said encoding means encodes said fourth component and said quantized orthogonal transformation coefficients to form compressed image data; and
recording means for recording said compressed image data to a recording medium.
3 Assignments
0 Petitions
Accused Products
Abstract
A DCT processing circuit outputs DCT coefficients based on image data stored in an image memory. The DCT coefficients are quantized by a quantization processing circuit, then input to a Huffman encoding processing circuit and an inverse quantization processing circuit. In the inverse quantization processing circuit, the DCT coefficients are reproduced. The differences between the reproduced DCT coefficients and the DCT coefficients output from the DCT processing circuit are determined as the quantized error data by subtractors. An error data synthesizing unit stores the error data in a fourth component of a JPEG format and inputs the error data to the Huffman encoding processing circuit. The output signals of the quantization processing circuit and the output signals of the error data synthesizing unit are Huffman encoded and recorded to an IC memory card.
-
Citations
14 Claims
-
1. An image signal processing device, comprising:
-
orthogonal transformation means for applying an orthogonal transformation to original image data comprising at least one image component to obtain orthogonal transformation coefficients corresponding to predetermined spatial frequencies for each image component, said original image data comprising a first, a second, and a third image component; quantization means for quantizing said orthogonal transformation coefficients, comprising quantization tables including quantization coefficients to obtain quantized orthogonal transformation coefficients; first inverse quantization means for inversely quantizing said quantized orthogonal transformation coefficients to obtain restored orthogonal transformation coefficients; error data producing means for obtaining quantized error data of a difference between said restored orthogonal transformation coefficients and said orthogonal transformation coefficients for each image component; encoding means for encoding said quantized error component and said quantized orthogonal transformation coefficients to form a compressed image data; error data synthesizing means for arranging said quantized error data into unit data of a fixed length for each same spatial frequency of components so as to synthesize a fourth component, said encoding means encodes said fourth component and said quantized orthogonal transformation coefficients to form compressed image data; and recording means for recording said compressed image data to a recording medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An image signal processing device comprising:
-
orthogonal transformation means for applying orthogonal transformation to original image data comprising at least one image component to obtain orthogonal transformation coefficients for each image component, said original image data comprising a first, a second and a third component; quantization means for quantizing said orthogonal transformation coefficients, comprising quantization tables including quantization coefficients to obtain the quantized orthogonal transformation coefficients; first inverse quantizing and inverse orthogonal transformation means for inverse quantization and inverse orthogonal transformation of said quantized orthogonal transformation coefficients to obtain restored inverse orthogonal transformation coefficients; error data producing means for obtaining error data of a difference between said restored inverse orthogonal transformation coefficients and said original image data for each component; encoding means for encoding said error data and said quantized orthogonal transformation coefficients to form compressed image data; error data synthesizing means for arranging said error data into unit data of a fixed length for each same spatial frequency of components to synthesize a fourth component, and said encoding means encodes said fourth component and said quantized orthogonal transformation coefficients to form compressed image data; and recording means for recording said compressed image data in a recording medium. - View Dependent Claims (13, 14)
-
Specification