Abstract: Provided are an image processing apparatus and image processing method capable of processing image data as packet data, and compressing the image data in real time to a data amount within the storage capacity of a memory. Image data in the form of packet data is divided into a plurality of blocks by a block forming circuit (102), and compressed at a first compression ratio by a DCT circuit (104), quantizing circuit (105), and Huffman encoding circuit (106) for each block. A counter (108) measures the data amount of the compressed image data. If the measured data amount is equal to or larger than a predetermined value, the image data stored in a memory (112) is recompressed at a second compression ratio as a higher compression ratio by a Huffman decoding circuit (113), bit shifting circuit (114), and Huffman encoding circuit (115).

Abstract: This invention provides an image processing apparatus which simplifies the circuit arrangement required for edge emphasis correction.

Abstract: This invention provides an image processing apparatus which simplifies the circuit arrangement required for edge emphasis correction.

Abstract: An object of the invention is to effectively and accurately detect a characteristic of an image. In order to achieve the object, the invention comprises a calculating means for calculating an isolated amount of a pixel value in each of plural areas respectively having different sizes, an integrating means for integrating the calculated isolated amount in a predetermined area, and an extracting means for extracting the image portion having the predetermined attribute, according to the integrated isolated amount.

Abstract: The color tone distributions of a plurality of types of specific originals are stored in advance in a ROM, and a first similarity between the color tone distributions corresponding to a predetermined discrimination criterion, and an input image signal is discriminated. A second similarity between the color tone distributions corresponding to a discrimination criterion which is changed based on the first similarity, and the input image signal is discriminated. Whether or not an original is similar to one of the plurality of types of specific originals is discriminated on the basis of the first and second similarities.

Abstract: A color image processing apparatus that prevents counterfeiting by detecting specific originals with high precision. Although general banknotes have graphic patterns drawn on uniform density portions, the tonality percepted by human eye is the mixture of the tonality of a graphic portion and the tonality of a uniform density portion. In consideration of the mixed tonality sensed by human eye, the apparatus smoothes a read image signal to generate mixed tonality for judgment, thus improves judgment precision. The total judgment of existence/absence of specific original is made by performing m judgments on m (m>n) judging conditions using the tonality data of pre-registered n (n: positive integer) specific originals.