US 6,272,259 B1 · Image correcting apparatus, image data compressing apparatus and imaging apparatus

Abstract

An image correcting apparatus is applied to a compression circuit for processing the compression of image data by subjecting each image data inputted on a block basis to orthogonal transformation, quantizing the image data according to quantization tables and subjecting the image data thus quantized to variable-length encoding and has a switching circuit for switching a first quantization table for use in quantizing image data in a block where an image flaw exists and a second quantization table for use in quantizing image data in a block where no image flaws exist according to flow position information for indicating a position where the image flaw is located. Furthermore, the image correcting apparatus preferably has a flaw detecting circuit for detecting whether the image flaw exists in a block by comparing each coefficient of single image data after orthogonal transformation with each reference coefficient after orthogonal transformation, and a data generating circuit for generating a first quantization table corresponding to the image flaw in the block. Moreover, an image data compressing apparatus has the image correcting apparatus and the compression circuit.

Claims25

Dependent claims

An image correcting apparatus applied to a compression circuit for processing the compression of image data by subjecting the image data inputted on a block basis to orthogonal transformation, quantizing the image data according to a quantization table and subjecting the image data to variable-length encoding according to an encoding table, the image correcting apparatus comprising:

a switching circuit for switching a first quantization table for quantizing image data in a block where the image flaw exists and a second quantization table for quantizing image data in a block where the image flaw does not exist on a block basis according to flaw position information for indicating a block position where the image flaw is located,
a flaw detecting circuit for comparing each coefficient after orthogonal transformation of image data of a single image with each reference coefficient after orthogonal transformation in order to detect whether or not the image flaw exists in the block.

An image data compressing apparatus comprising:

a compression circuit for processing the compression of image data, wherein the compression circuit comprises orthogonal transformation means for subjecting each image data inputted on a block basis to orthogonal transformation, quantizing means for quantizing the image data subjected to orthogonal transformation by the orthogonal transformation means according to quantization tables and an encoding circuit for subjecting the image data quantized by the quantizing means to variable-length encoding according to an encoding table and
an image correcting apparatus comprising a switching circuit for switching a first quantization table for quantizing image data in a block where the image flaw exists and a second quantization table for quantizing image data in a block where the image flaw does not exist on a block basis according to flaw position information for indicating a position where the image flaw is located, the quantization tables being used in the quantizing means.

An imaging apparatus comprising:

a lens for forming an image,
an imaging device for subjecting the image passed through the lens to photoelectric conversion,
a block conversion circuit for dividing image data outputted from the imaging device on a block basis,
a compression circuit for processing the compression of image data, wherein the compression circuit comprises orthogonal transformation means for subjecting each image data inputted from the block conversion circuit on a block basis to orthogonal transformation, quantizing means for quantizing the image data subjected to orthogonal transformation by the orthogonal transformation means according to quantization tables and an encoding circuit for subjecting the image data quantized by the quantizing means to variable-length encoding according to an encoding table, and
an image correcting apparatus comprising a switching circuit for switching a first quantization table for quantizing image data in a block where the image flaw exists and a second quantization table for quantizing image data in a block where the image flaw does not exist on a block basis according to block position information for indicating a position where the image flaw is located, as the quantization tables being used in the quantizing means.

2 more elements

Dependencies are inferred from the claim text.

Image correcting apparatus, image data compressing apparatus and imaging apparatus

Life of this patent

Image correcting apparatus, image data compressing apparatus and imaging apparatus

Life of this patent

Abstract

Claims25