WO2001017230A1 - Dispositif de codage d'image et procede correspondant, dispositif de decodage d'image et procede correspondant, et support enregistre lisible par l'ordinateur pour enregistrer un programme de codage et de decodage d'image - Google Patents
Dispositif de codage d'image et procede correspondant, dispositif de decodage d'image et procede correspondant, et support enregistre lisible par l'ordinateur pour enregistrer un programme de codage et de decodage d'image Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/41—Bandwidth or redundancy reduction
- H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures
- H04N1/413—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information
Definitions
- the present invention relates to an image encoding apparatus and method, an image decoding apparatus and method, and a computer-readable recording medium on which an image encoding program and an image decoding program are recorded.
- the present invention relates to an image encoding device and its method, an image decoding device and its method, and a computer-readable recording medium recording an image encoding program and an image decoding program, respectively.
- the present invention relates to a computer-readable recording medium on which an encrypted program and an image decryption program are respectively recorded.
- a method of compressing a document image a method of treating the document image as a binary image and compressing it using MMR (Modified Modified Read) or JBIG (Joint Bi-level Image Coding Experts Group). .
- MMR Modified Modified Read
- JBIG Joint Bi-level Image Coding Experts Group
- MMR or JBIG standards are being developed with an emphasis on applications to facsimile (see ISO / IEC JTC1 / SC29 / WG1 N1359, "14492 FCD Information technology-Coaed Representation of Picture and Audio Information. Lossy / Lossless Coding of Bi-level Images ", JBIG committee (1999 July 16)), which is now a practical standard for binary image compression.
- compression techniques such as MMR or JBIG are reused by modularization with hardware or software.
- hardware devices are used in devices with low CPU (Central Processing Unit) power, such as mobile information terminals, where it is difficult to perform software processing on image compression in terms of processing speed. High effect.
- CPU Central Processing Unit
- a compression method for a document image composed of a multi-valued image the multi-valued image is divided into a plurality of weighted bit planes, and each is represented as a binary image.
- a method of decomposing and handling binary images has been used.
- Fig. 1 shows such an example.
- Fig. 1 shows an octal image in which each pixel can take an octal value (0 to 7).
- Figs. 2 to 4 show diagrams in which the octal image is divided into three planes. ing.
- Each plane corresponds to each digit when each original pixel is represented by a 3-digit binary number. At this time, the value of each plane is determined by whether each digit is 0 or 1.
- the first plane shown in FIG. 2 corresponds to the highest digit of the three digits
- the second plane shown in FIG. 3 corresponds to the second highest digit
- the third plane shown in FIG. It corresponds to the lower digit.
- the first to third planes are each subjected to binary image compression independently of the other planes, and do not use the correlation between the respective planes.
- the compression capacity increases. For example, in an 8-valued image that can take 8 values from 0 to 7, the value of 0 (0 0 0 when represented by a 3-digit binary number) and the value of 7 (1 1 1 when represented by a 3-digit binary number) ),
- the contents of the first to third planes are all the same according to the bit plane creation method described above.
- each plane is compressed independently, the compression capacity has expanded to three times that of the existing plane, despite the fact that there is only one plane worth of information.
- a compression method that uses the correlation between bit planes to solve the above problem, It is disclosed in Japanese Patent Application Laid-Open No. 63-2966564.
- the most significant plane is encoded by the first encoding method, and the planes below it are linearly encoded using the pixels of the bit plane encoded up to that point and the already encoded pixels of the bit plane. It performs encoding while making predictions.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide an image coding apparatus and a method thereof which correspond to a standard method of binary image compression and improve the compression efficiency of a multi-valued image.
- An object of the present invention is to provide a decoding device and its method, and a computer-readable recording medium on which an image encoding program and an image decoding program are respectively recorded.
- Another object of the present invention is to provide an image encoding apparatus and method, an image decoding apparatus and method, and an image encoding apparatus and method, in which continuous images are adapted to a standard compression method and improved in compression efficiency.
- An object of the present invention is to provide a computer-readable recording medium on which a decryption program is recorded.
- An image encoding apparatus includes: a bit plane separator that separates single image data into a plurality of bit planes determined according to the number of bits forming each pixel; And a compression preprocessor that arranges the bit data at the same position forming multiple bit planes at neighboring positions and combines them into a single bit plane, and a single bit connected to the compression preprocessor And a data compressor for image-compressing the plane.
- the compression preprocessor sequentially decodes one line at a time from a plurality of bit planes.
- the data compressor is connected to the pre-compression processor, and is a combined plane data compressor for image-compressing a single bit plane. And a bit plane data compressor.
- the image coding apparatus is further connected to a composite plane data compressor and a bit plane data compressor, and is configured to reduce the data capacity of a single bit plane after image compression and the data capacity of each of a plurality of bit planes after image compression. Includes a capacity comparator that compares the sum and uses the smaller capacity data as compressed data. Both a method of combining a plurality of bit planes into a single bit plane and then compressing the same and a method of individually compressing a plurality of bit planes can be supported. For this reason, an optimal compression method can always be adopted regardless of the characteristics of the data of the original image.
- an image encoding apparatus in which bit data at the same position constituting a plurality of continuously input image data are arranged at neighboring positions and combined into a single image data before compression. And a data compressor connected to the pre-compression processor and compressing the single image data.
- bit data at the same position has a correlation.
- a single image data is synthesized from a plurality of image data and the image is compressed, so that the compression capacity can be reduced. It can also support existing image compression standard methods.
- an image decoding apparatus comprising: a data decompressor for decompressing compressed data into a single bit plane; and a bit at the same position which is connected to the data decompressor and constitutes a plurality of bit planes.
- Data was arranged in a nearby position and synthesized A decompressor that separates a single bit plane into a plurality of bit planes, and is connected to the decompressor, and the value of each pixel of the plurality of bit planes is used as the bit value of each pixel.
- a bit plane integrator that integrates the image data into the image data.
- the image data encoded by the image encoding device can be decoded.
- An image decoding apparatus includes a data decompressor that decompresses compressed data to a single bit plane, and a single decompressor connected to the data decompressor and decompressed by the data decompressor.
- a data type determiner for determining whether a bit plane is a bit plane obtained by combining a plurality of bit planes into a single bit plane and then compressed or a bit plane obtained by individually compressing a plurality of bit planes; and A single bit plane that is connected to the data type determiner and is synthesized by arranging the bit data at the same position forming the A post-decompression processor that selectively executes whether or not to separate into bit planes; and a decompression processor connected to the decompression Was a bit value of each pixel, and a bit plane integrator to integrate a plurality of bit planes to the image data.
- An image decoding apparatus includes a data decompressor that decompresses compressed data into single image data, and a data decompressor connected to the data decompressor and configured to form a plurality of image data. And a post-decompression processor for separating single image data synthesized by arranging the bit data in the vicinity into a plurality of image data.
- the image data encoded by the image encoding device can be decoded.
- An image encoding method includes: a step of separating single image data into a plurality of bit planes determined according to the number of bits forming each pixel; The steps of arranging the bit data at the same position in the vicinity at a nearby position and synthesizing them into a single bit plane, and image compressing the single bit plane.
- Separate single image data into multiple bit planes combine multiple bit planes at the same position that make up the multiple bit planes, and combine them into a single bit plane to create a single bit plane Image compression of plane.
- the compression capacity can be reduced during multi-level image compression. It can also support existing binary image compression standards, and can use existing hardware or software modules.
- an image coding method comprising: arranging bit data at the same position constituting a plurality of continuously input image data at neighboring positions and synthesizing them into a single image data; Performing image compression of the single image data.
- bit data at the same position has a correlation.
- an image decoding method comprising the steps of: decompressing compressed data into a single bit plane; synthesizing by arranging bit data at the same position constituting a plurality of bit planes at neighboring positions. Separating the single bit plane into a plurality of bit planes, and setting the value of each pixel of the plurality of bit planes as the bit value of each pixel, and integrating the plurality of bit planes into image data.
- Image data encoded by the image encoding method can be decoded.
- an image decoding method comprising the steps of: expanding compressed data into a single bit plane; and decompressing the single bit plane into a single bit plane.
- Based on the output result of the data type determiner perform decoding of both compressed data and data obtained by combining multiple bit planes into a single bit plane and then compressing multiple bit planes individually. Can be.
- an image decoding method comprising the steps of: expanding compressed data into single image data; arranging bit data at the same position forming a plurality of image data in the vicinity, and combining the data. Separating the single image data into a plurality of image data.
- Image data encoded by the image encoding method can be decoded.
- a computer-readable recording medium includes: a step of separating single image data into a plurality of bit planes determined according to the number of bits forming each pixel; An image encoding program for causing a computer to execute the steps of arranging bit data at the same position forming a plane at adjacent positions and combining them into a single bit plane, and compressing an image of a single bit plane is recorded. ing.
- a computer-readable recording medium comprising: a step of arranging bit data at the same position constituting a plurality of continuously input image data at a nearby position and combining them into a single image data And a step of image-compressing single image data.
- bit data at the same position has a correlation.
- a computer-readable recording medium is Decompressing the combined data into a single bit plane, and separating a single bit plane composed by arranging bit data at the same position forming multiple bit planes at neighboring positions into multiple bit planes
- An image decoding program for causing a computer to execute the steps and the step of setting the value of each pixel of the plurality of bit planes as the bit value of each pixel and integrating the plurality of bit planes into image data is recorded.
- Image data encoded by the image encoding method can be decoded.
- a computer-readable recording medium includes a step of decompressing compressed data into a single bit plane, and the decompressed single bit plane converts a plurality of bit planes into a single bit plane. Determining whether the bit plane is a compressed bit plane after being combined with a bit plane or a bit plane obtained by individually compressing a plurality of bit planes; and forming a plurality of bit planes based on the determination result. Selectively executing whether or not to separate a single bit plane synthesized by arranging the bit data at the positions into neighboring positions into a plurality of bit planes, and determining a value of each pixel of the plurality of bit planes. Integrating a plurality of bit planes into image data as a bit value of each pixel. Records the decryption program.
- a computer-readable recording medium includes a step of decompressing compressed data into single image data, and arranging bit data at the same position constituting a plurality of image data in the vicinity. And a step of separating a single image data synthesized by the above into a plurality of image data.
- Image data encoded by the image encoding method can be decoded.
- FIG. 1 is a diagram showing an example of a multi-value image.
- FIGS. 2 to 4 are diagrams showing an example of a bit plane of the multilevel image shown in FIG.
- FIG. 5 is a block diagram showing a hardware configuration of the image encoding device according to the first embodiment.
- FIG. 6 is a flowchart of an image encoding process according to the first embodiment.
- FIG. 7 is a diagram showing an example of a bit plane generation rule of the multi-value image shown in FIG.
- FIG. 8 is a diagram showing an example of a method of creating a composite plane from three bit planes.
- FIG. 9 is a diagram illustrating an example of a method of combining a combining plane from four bit planes in pixel units.
- FIG. 10 is a block diagram showing a hardware configuration of an image decoding apparatus according to the second embodiment.
- FIG. 11 is a flowchart of an image decoding process according to the second embodiment.
- FIG. 12 is a diagram showing an example of a method of separating three bit planes from a composite plane in the second embodiment.
- FIG. 13 is a block diagram showing a hardware configuration of an image encoding device according to the third embodiment.
- FIG. 14 is a flowchart of the image encoding process according to the third embodiment.
- FIG. 15 is a diagram showing an example of rules for distinguishing whether compressed data is a composite plane or data compressed for each plane.
- FIG. 16 is a block diagram showing a hardware configuration of an image decoding apparatus according to the fourth embodiment.
- FIG. 17 is a flowchart of an image decoding process according to the fourth embodiment.
- FIG. 18 is a block diagram showing a hardware configuration of an image encoding device according to the fifth embodiment.
- FIG. 19 is a flowchart of an image encoding process according to the fifth embodiment.
- FIG. 20 is a block diagram showing a hardware configuration of an image decoding device according to the sixth embodiment.
- FIG. 21 is a flowchart of an image decoding process according to the sixth embodiment.
- FIG. 22 is a diagram showing an example of a method of separating four bit planes from a composite brain in pixel units. BEST MODE FOR CARRYING OUT THE INVENTION
- an image encoding device is connected to an image input device 301 for inputting an image, an image input device 301, and is connected to the image input device 301.
- Bit plane separation that is connected to the image data memory 302 that stores the input image data and the image data memory 302 that separates the image data stored in the image data memory 302 into bit planes
- a bit plane memory 304 connected to the bit plane separator 303 and storing the bit planes separated by the bit plane separator 303.
- the image coding apparatus is further connected to a bit plane memory 304, and stores the data of each bit plane stored in the bit plane memory 304 into one plane (hereinafter referred to as a “composite plane”). ), which is connected to the pre-compression processor 305 and the pre-compression processor 305, and which is connected to the data compressor 306 for compressing the composite plane and the data compressor 306. And a compressed data memory 307 for storing compressed data output from the compressor 306.
- a scanner is used as the image input device 301, but the image input device 301 is not limited thereto.
- step An image encoding process using the image encoding device shown in FIG. 5 will be described with reference to FIG.
- Image data input from the image input device 301 is written to the image data memory 302 (step (hereinafter, abbreviated as “step”) S 1 0 0 1) 0
- the image data stored in the image data memory 302 is separated into bit planes by the bit plane separator 303 and stored in the bit plane memory 304 (S1002).
- the number of colors (the number of P-tones) of the original image (input image) is eight gradations
- the image stored in the image data memory 302 is 0-7. Takes one of eight values.
- bit plane separator 303 is separated into three bit planes, but the present invention is not limited to this. However, a value obtained by raising 2 to the power of the number of bit planes (the maximum number of colors that can be represented by a combination of bit planes) Power S, if the number of colors is smaller than that of the original image, information may be lost when represented as a bit plane You need to be careful.
- the method of determining the pixel value of each bit plane shall follow the rules shown in FIG. For example, when the pixel value of the original image is 0, the pixel values of planes 1 to 3 are all determined to be 0, and when the pixel value of the original image is 1, the pixel values of plane 1 to plane 2 are set to 0 Is determined, and the pixel value of plane 3 is determined to be 1.
- FIG. 8 shows a method of synthesizing a composite plane from three bit planes.
- data is extracted line by line from three planes in order to create a composite plane.
- line 0 of plane 0 is line 0 of the composite plane
- line 0 of plane 1 is line 1 of the composite plane
- line 0 of plane 2 is line 2 of the composite plane
- line 1 of plane 0 is the composite plane Line 3
- the width of the created composite plane is the same as that of the original image (or each bit plane before composition), but the height is tripled.
- the method of assembling the lines when synthesizing the composite plane from each bit plane shown in FIG. 8 is not limited to this as long as the arrangement can enhance the correlation between the lines. Absent.
- the combined plane is compressed in the data compressor 306 and stored in the compressed data memory 307 (S104).
- JBIG is assumed as the compression method of the data compressor 306, but the present invention is not limited to this.
- MMR is known in addition to JBIG.
- a failure direction line may be used instead of combining along the horizontal direction line.
- the composition may be performed in pixel units instead of line units.
- FIG. 9 shows an example of a method of synthesizing a composite plane from four bit planes in pixel units.
- the number of planes is assumed to be four. Force The present invention is not limited to this.
- the pixels of plane 0 to plane 3 are regularly arranged in the composite plane.
- each pixel at the same position in plane 0 to plane 3 (0000 in plane 0) Pixels, 100 pixels in plane 1, 200 pixels in plane 2, and 300 pixels in plane 3) can be located close to 4 in the composite plane, thereby increasing the correlation of each pixel and thus compressing Rate can be increased.
- a single image data is divided into a plurality of bit planes, and the bit data at the same position constituting the plurality of bit planes are arranged so as to be located in the vicinity. Combines a single bit plane and image compresses the single bit plane. As a result, the compression capacity can be reduced during multi-valued image compression. It can also support existing binary image compression standards, and can use existing hardware or software modules.
- an image decoding device corresponding to the image encoding device according to the first embodiment includes a compressed data memory for storing compressed data compressed by the image encoding device.
- bit plane memory 404 connected to the post-decompression processor 403 for storing the bit plane.
- the image decoding apparatus is further connected to a bit plane memory 404, and connected to a bit plane integrator 405 that integrates bit planes to create a multi-valued image, and a bit plane integrator 405. It includes an image data memory 406 for storing multi-valued images, and an image output device 407 connected to the image data memory 406 for displaying multi-valued images.
- the image output device 407 is assumed to be a CRT (Cathode-Ray Tube), but is not limited to this.
- the compressed data stored in the compressed data memory 401 is decompressed by the data decompressor 402 and supplied to the post-decompression processor 403 (S111). Since this embodiment corresponds to the first embodiment, JBIG is also used in the decompression processing of the data decompressor 402.
- the post-decompressor 403 separates the composite plane, which is the output of the data decompressor 402, into bit planes, and stores them in the bit plane memory 404 (S1102).
- the process of separating three bit planes from the composite plane will be described with reference to FIG. In other words, the process is the reverse of the procedure for creating the composite plane in the encoding device shown in FIG. 8, in which one line is sequentially extracted from the composite plane and separated into bit planes.
- line 0 of the composite plane is line 0 of plane 0
- line 1 of the composite plane is line 0 of plane 1
- line 2 of the composite plane is line 0 of plane 2
- line 3 of the composite plane is plane 0.
- bit plane that is the output of the post-decompression processor 400 is stored in the bit plane memory 4
- the bit plane integrator 405 creates a multi-valued image from the contents of the planes 1 to 3 stored in the bit plane memory 404 according to the rules shown in FIG. 7 and stores it in the image data memory 406. (S111).
- the multi-valued image thus decoded is output to the image output device 407 (S 1 104).
- an image encoding apparatus includes an image input device 301, an image data memory 302 connected to the image input device 301, and an image data memory.
- Bit plane separator 303 connected to 302, bit plane memory 304 connected to bit plane separator 303, and compression preprocessor connected to bit plane memory 304 3 0 5 is included.
- the image coding apparatus further includes a bit plane memory 304 and a compression preprocessor.
- a data compressor 806 connected to the data plane 305 and compressing the bit plane and the composite plane, respectively, and a data compressor 806 connected to the data compressor 806 and temporarily storing the compressed data of the bit plane.
- a second-compressed data memory 808 connected to the time-compressed data memory 807 and the data compressor 806 for temporarily storing data obtained by compressing the combined plane; and a first temporarily-compressed data memory
- a capacity comparison which is connected to 807 and the second-time compressed data memory 808 and compares the data capacity stored in the first-time compressed data memory 807 and the second-time compressed data memory 808
- the first-time compressed data memory 807 or the second-time compressed data memory 808 is connected to the comparator 809 and the capacity comparator 809 based on the comparison result of the capacity comparator 809. Compressed data memory for storing compressed data stored in memory
- Compressed data memory for storing compressed data stored in memory
- the data compressor 806 assumes JBIG compression as in the first embodiment, but the present invention is not limited to this, as described in the first embodiment.
- bit plane memory 304 is compressed for each plane by the data compressor 806 and stored in the first temporary compression data memory 807 (S123).
- the data of each bitplane stored in the bitplane memory 304 is synthesized into a synthesis plane in the compression preprocessor 304 (S1). 0 0 3).
- the created composite plane is compressed by the data compressor 806 and stored in the second-time compressed data memory 808 (S125).
- the capacity comparator 809 determines the capacity (hereinafter referred to as “D 1”) of the data stored in the first-time compressed data memory 807 and the data stored in the second-time compressed data memory 808. —The capacity of the data (hereinafter referred to as “D 2”) (S 1206). If the value of D2 is equal to or greater than the value of D1 (YES in S1206), the contents of the first temporary compressed data memory 807 are copied to the compressed data memory 307 (S1 207). In other cases, the contents of the second-time compressed data memory 808 are copied to the compressed data memory 307 (S122).
- the meaning of S 1207 and S 1208 will be added.
- the purpose of creating and compressing composite planes is to use the correlation between planes to achieve a higher compression ratio than compressing plane by plane.
- the premise is the empirical fact that there is a correlation between planes, as shown in Figs. However, it is logically possible that there is little correlation between the planes. In such cases, creating a composite plane and then compressing it does not necessarily lead to an improvement in the compression ratio. Therefore, in such a case, a high compression rate is obtained regardless of the type of image by compressing each plane as in the past.
- the method of compressing each plane in S123 and the method of compressing the composite plane in S125 are the same, but different methods may be used.
- the compressed data contains information such as the number of planes included in the data and the range of the compressed data corresponding to each plane.Therefore, when decoding, the compressed data is compressed for each power plane, which is a composite plane. It is easy to distinguish whether the data is data that has been obtained. However, the method of describing compressed data of multiple planes is not specified. In the case of a different compression method, it is necessary to consider the arrangement of the contents of the first temporary compressed data memory 807 so that the compressed data for each plane can be distinguished during decoding. Such an example is shown in Figure 15. That is, by storing the number of planes and the number of bytes of compressed data of each plane at the head, the existence range of the data of each plane can be clarified.
- an image decoding apparatus corresponding to the image encoding apparatus includes a compressed data memory 401 and data decompression connected to the compressed data memory 401.
- Data type determiner 903 connected to the data expander 402 and the data expander 402 to determine the type of plane data expanded by the data expander 402, and the data type determiner 90 3, a decompression post-processor 403 that separates a composite plane into bit planes based on the judgment result of the data type judgment unit 903, a data type judgment unit 903, and a post-decompression processor 4.
- Bit plane memory 404 that is connected to 03 and stores the bit plane, bit plane integrator 405 connected to bit plane memory 404, and bit plane integrator 405 Image data memory 406 and the image data memory 406 Image output apparatus 4 0 7 and the including.
- JBIG is also used in the expansion processing of the data expander 402.
- the compressed data stored in the compressed data memory 401 is decompressed by the data decompressor 402 (S111).
- the data type judgment unit 9 03 Identifies whether the compressed data is data obtained by combining a plurality of bit planes into a single bit plane and then compressed, or is data obtained by individually compressing a plurality of bit planes (S1304) .
- This identification method is performed by reading the number of planes included in the compressed data from the compressed data.
- JBIG which is the compression method of this embodiment, uses the information corresponding to the number of planes stored in the header part of the compressed data according to the regulations.
- the number of planes and the number of bytes of data to be decompressed easily for example, by using a data format as shown in Fig. 15 You can know. Also, if the size of the original image (or each bit plane before synthesis) is known, the size can be compared with the size of the image decompressed by the data decompressor 402. It is identifiable. This is because the height or width of the composite plane is always an integral multiple of the original image (or each bit plane before composition). For example, in the synthesis method shown in Fig. 8, the vertical width of the synthesis plane is three times that of the original image (or each bit plane before synthesis). It can be easily determined whether there is.
- the compressed data is a synthesized plane.However, it is determined whether or not the compressed data is a synthesized plane without performing the data expansion. If it can be determined, it is possible to do so.
- the compression of the composite plane is performed as described in the third embodiment.
- a higher compression rate can be achieved by using another compression method in the data decompressor 402.
- both the data obtained by combining a plurality of bit planes into a single bit plane and then compressed and the data obtained by individually compressing a plurality of bit planes are obtained.
- Decryption can be performed.
- an image that achieves a higher compression ratio is created by creating a composite plane from a series of highly similar continuous images instead of multiple bit planes created from the same image and performing compression. It is an encoding device.
- an image coding apparatus is connected to an image input apparatus 1501 for inputting a continuous image, an image input apparatus 1501, and an image input apparatus 1 Image data memory 1502 for storing continuous image data input from 501, and image data memory 1502 before compression for generating a composite plane from continuous image data input Connected to the processor 1503 and the pre-compression processor 1503 to compress the composite plane, and connected to the data compressor 1504 and the data compressor 1504 and connected to the data compressor 1 And a compressed data memory 1505 for storing the compressed data output from the 504.
- the continuous image input from the image input device 1501 is stored in the image data memory 1502 (S1771).
- the image data memory 1502 has a structure capable of storing a plurality of image data.
- the input image is assumed to be a color image of 256 gradations taking values from 0 to 255.
- the number of gradations and the type of image (color image or binary Is not limited to this.
- a bit plane is prepared for each color component (RGB, YCbCr, etc.), and a composite plane is generated from each bit plane, thereby applying the present invention. It is possible.
- the compression preprocessor 1 500 generates a composite plane from the input continuous image. (S1702). That is, pixels at the same position are selected from a predetermined number of images, and a composite plane is generated so that those pixels are located in the vicinity.
- This embodiment is different from the first embodiment in that the image of each bit plane for synthesizing the synthesized plane is not a binary image but a multi-valued image.
- the synthesis play is performed such that the correlated pixels between different planes become pixels located nearby.
- a composite plane is generated from four images according to the correspondence shown in FIG. 9, but a composite plane may be generated from three images according to the correspondence shown in FIG.
- the present invention is not limited to these synthesis methods.
- the composite plane generated by the compression preprocessor 1503 is compressed by the data compressor 1504 and stored in the image data memory 1502 (S1703).
- the compression method of the data compressor 1504 employs JPEG (Joint Photographic Experts Group) compression, but the closer the pixels located in the vicinity are, the higher the compression ratio and the higher the compression ratio.
- JPEG Joint Photographic Experts Group
- the compression method that can be expected is not limited to this. It is known that the large correlation between pixels and the small number of high-frequency components are essentially the same (see “Image Information Compression” Ohmsha (1991)). Since any method is used for the method, any ordinary compression method can be applied to the present invention.
- the image when compressing a plurality of multi-valued images, instead of compressing the plurality of multi-valued images individually, the image is converted to a composite plane and then compressed, which is higher than the compression of individual data. It is intended to obtain a compression ratio. Consecutive frames in a series of moving image sequences, or document images taken from the same book, have high similarity in individual images. Therefore, such an effect can be expected.
- the present invention when the present invention is applied, only when a higher compression ratio can be obtained, compression is performed using a composite plane. In other cases, compression is performed for each individual image. It is also possible.
- the bit data at the same position has a correlation.
- multiple image data can be By combining one image data and compressing the image, the compression capacity can be reduced. It can also support existing image compression standard methods.
- an image decoding device corresponding to the image encoding device includes a compressed data memory 1601 storing compressed data compressed by the image encoding device, A data plane that is connected to the compressed data memory 1601, expands the compressed data, and a composite plane that is connected to the data expander 1602 and that is output from the data expander 1602.
- a post-decompression processor 1603 for separating the image into a plurality of images; an image data memory 164 connected to the post-decompression processor 163 for storing a plurality of separated images;
- an image output device 165 connected to the data memory 164 for displaying a plurality of images.
- the compressed data extracted from the compressed data memory 1601 is decompressed by the data decompressor 1602, and supplied to the post-decompressor 1603 (S1801).
- the decoded composite plane is separated into a plurality of images in the post-decompression processor 1603, and is stored in the image data memory 1604 (S1802).
- the reverse process of the combining method shown in FIG. 9 may be performed as shown in FIG.
- the separating method will be different accordingly.
- the plurality of image data stored in the image data memory is output from the image output device 1605. According to this embodiment, it is possible to decode the image data encoded by the image encoding device described in the fifth embodiment.
- each program is provided by a computer-readable recording medium such as a magnetic disk or a CD-ROM (Compact Disc-Read Only Memory). Further, each program may be supplied to a computer by another computer via a communication line.
- a computer-readable recording medium such as a magnetic disk or a CD-ROM (Compact Disc-Read Only Memory).
- each program may be supplied to a computer by another computer via a communication line.
- the correlation between each bit plane is determined. As well as using standard image compression, higher compression rates can be achieved while using existing hardware or software modules.
- processing when generating a composite plane can be reduced.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00951993A EP1217827A4 (en) | 1999-08-27 | 2000-08-14 | IMAGE ENCODING DEVICE AND CORRESPONDING METHOD, IMAGE DECODING DEVICE AND CORRESPONDING METHOD, AND COMPUTER READABLE RECORDED MEDIUM FOR RECORDING AN IMAGE ENCODING AND DECODING PROGRAM |
US10/049,513 US7031531B1 (en) | 1999-08-27 | 2000-08-14 | Image encoding device and method therefor, image decoding apparatus and method therefor, and computer-readable recorded medium on which image encoding program and image decoding program are recorded |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24071299A JP3853115B2 (ja) | 1999-08-27 | 1999-08-27 | 画像符号化装置、画像復号化装置、画像符号化方法及び画像復号化方法 |
JP11/240712 | 1999-08-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001017230A1 true WO2001017230A1 (fr) | 2001-03-08 |
Family
ID=17063597
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/005450 WO2001017230A1 (fr) | 1999-08-27 | 2000-08-14 | Dispositif de codage d'image et procede correspondant, dispositif de decodage d'image et procede correspondant, et support enregistre lisible par l'ordinateur pour enregistrer un programme de codage et de decodage d'image |
Country Status (5)
Country | Link |
---|---|
US (1) | US7031531B1 (ja) |
EP (1) | EP1217827A4 (ja) |
JP (1) | JP3853115B2 (ja) |
TW (1) | TW595122B (ja) |
WO (1) | WO2001017230A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114630125A (zh) * | 2022-03-23 | 2022-06-14 | 徐州百事利电动车业有限公司 | 基于人工智能与大数据的车辆图像压缩方法与系统 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3805172B2 (ja) * | 1999-09-30 | 2006-08-02 | キヤノン株式会社 | 画像処理装置及び方法及び記憶媒体 |
JP2004120122A (ja) * | 2002-09-24 | 2004-04-15 | Sharp Corp | 画像処理装置 |
AU2004284829A1 (en) * | 2003-12-15 | 2005-07-07 | Matrixview Limited | Compressing image data |
CN100338937C (zh) * | 2004-03-02 | 2007-09-19 | 致伸科技股份有限公司 | 影像压缩装置及其方法 |
TWI344305B (en) * | 2007-05-16 | 2011-06-21 | Alpha Imaging Technology Corp | Image processing method and apparatus thereof |
JP2011217347A (ja) * | 2010-03-16 | 2011-10-27 | Sony Corp | 画像符号化装置とその方法、画像復号化装置とその方法、およびプログラム |
Citations (8)
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JPH0530496A (ja) * | 1990-06-13 | 1993-02-05 | Mitsubishi Electric Corp | 符号化方法及び符号化装置 |
JPH05145766A (ja) * | 1991-11-22 | 1993-06-11 | Canon Inc | 画像処理装置 |
JPH06113333A (ja) * | 1992-09-28 | 1994-04-22 | Fujitsu Ltd | 多眼式立体映像の直交変換符号化方式 |
JPH06169407A (ja) | 1992-11-27 | 1994-06-14 | Fuji Xerox Co Ltd | 符号化装置 |
US5341440A (en) | 1991-07-12 | 1994-08-23 | Earl Joseph G | Method and apparatus for increasing information compressibility |
JPH06332667A (ja) * | 1993-05-26 | 1994-12-02 | Canon Inc | 符号化装置 |
JPH0746532A (ja) * | 1993-08-02 | 1995-02-14 | Sharp Corp | 映像信号のディジタル記録及び再生装置 |
JPH07322070A (ja) | 1994-05-24 | 1995-12-08 | Ricoh Co Ltd | ファクシミリ装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS625779A (ja) * | 1985-03-04 | 1987-01-12 | Kokusai Denshin Denwa Co Ltd <Kdd> | 階調フアクシミリ画像信号の符号化方式 |
JPS63296564A (ja) | 1987-05-28 | 1988-12-02 | Matsushita Electric Ind Co Ltd | ビットプレ−ン予測符号化方法 |
US4951229A (en) * | 1988-07-22 | 1990-08-21 | International Business Machines Corporation | Apparatus and method for managing multiple images in a graphic display system |
EP0523939B1 (en) * | 1991-07-15 | 1998-10-07 | Canon Kabushiki Kaisha | Image encoding |
US5442458A (en) * | 1991-12-18 | 1995-08-15 | Eastman Kodak Company | Method and associated apparatus for encoding bitplanes for improved coding efficiency |
US5603043A (en) * | 1992-11-05 | 1997-02-11 | Giga Operations Corporation | System for compiling algorithmic language source code for implementation in programmable hardware |
JP3364074B2 (ja) | 1995-06-05 | 2003-01-08 | 株式会社リコー | ビットプレーン符号化装置 |
GB2327003A (en) * | 1997-07-04 | 1999-01-06 | Secr Defence | Image data encoding system |
-
1999
- 1999-08-27 JP JP24071299A patent/JP3853115B2/ja not_active Expired - Fee Related
-
2000
- 2000-08-14 WO PCT/JP2000/005450 patent/WO2001017230A1/ja active Application Filing
- 2000-08-14 US US10/049,513 patent/US7031531B1/en not_active Expired - Fee Related
- 2000-08-14 EP EP00951993A patent/EP1217827A4/en not_active Withdrawn
- 2000-08-17 TW TW89116632A patent/TW595122B/zh not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0530496A (ja) * | 1990-06-13 | 1993-02-05 | Mitsubishi Electric Corp | 符号化方法及び符号化装置 |
US5341440A (en) | 1991-07-12 | 1994-08-23 | Earl Joseph G | Method and apparatus for increasing information compressibility |
JPH05145766A (ja) * | 1991-11-22 | 1993-06-11 | Canon Inc | 画像処理装置 |
JPH06113333A (ja) * | 1992-09-28 | 1994-04-22 | Fujitsu Ltd | 多眼式立体映像の直交変換符号化方式 |
JPH06169407A (ja) | 1992-11-27 | 1994-06-14 | Fuji Xerox Co Ltd | 符号化装置 |
JPH06332667A (ja) * | 1993-05-26 | 1994-12-02 | Canon Inc | 符号化装置 |
JPH0746532A (ja) * | 1993-08-02 | 1995-02-14 | Sharp Corp | 映像信号のディジタル記録及び再生装置 |
JPH07322070A (ja) | 1994-05-24 | 1995-12-08 | Ricoh Co Ltd | ファクシミリ装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1217827A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114630125A (zh) * | 2022-03-23 | 2022-06-14 | 徐州百事利电动车业有限公司 | 基于人工智能与大数据的车辆图像压缩方法与系统 |
CN114630125B (zh) * | 2022-03-23 | 2023-10-27 | 徐州百事利电动车业有限公司 | 基于人工智能与大数据的车辆图像压缩方法与系统 |
Also Published As
Publication number | Publication date |
---|---|
EP1217827A4 (en) | 2008-04-09 |
US7031531B1 (en) | 2006-04-18 |
JP3853115B2 (ja) | 2006-12-06 |
EP1217827A1 (en) | 2002-06-26 |
TW595122B (en) | 2004-06-21 |
JP2001069505A (ja) | 2001-03-16 |
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