WO2004056084A1 - 画像データの圧縮装置及び復元装置、並びに画像データの圧縮プログラム及び復元プログラム - Google Patents
画像データの圧縮装置及び復元装置、並びに画像データの圧縮プログラム及び復元プログラム 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
- H04N1/46—Colour picture communication systems
- H04N1/64—Systems for the transmission or the storage of the colour picture signal; Details therefor, e.g. coding or decoding means therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
- H04N19/33—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability in the spatial domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
Definitions
- the present invention relates to an image data compression device and a decompression device, and an image data compression program and a decompression program.
- JPEG and JPEG 2000 have been developed as compression and decompression methods for still image data.
- JPEG or JPEG2000 Information technology: JPEG2000 image coding system, ISO / IEC FCD1544-1, March 2000, Information technology: digital compression and coding of continuous tone sti 11 images (JPEG) , Described in ISO / IEC 10918-1, 1993.
- Image processing device and method, image output device, and digital camera device and portable information terminal using the same filed on June 18, 2004 by the applicant of the present invention (Application No. 2002 No. 177, 107) describes an image processing apparatus and an image processing method, and more specifically, color data for a plurality of different color components. There is disclosed an image processing apparatus and an image processing method that divides the included color image data into a plurality of pieces while maintaining the data size, and further outputs after performing processing such as compression.
- the present invention provides an image data compression device and a decompression device capable of transmitting and receiving image data with a smaller data amount by applying this technology, and a compression program and a decompression program for image data. It is. Disclosure of the invention
- the present invention provides a device for compressing image data, which comprises obtaining a plurality of single-component image data relating to color, which can be obtained by sampling image data of a predetermined area. At least one single-component image data is divided into a plurality of single-component image data, and the plurality of single-component image data are converted into a larger number of single-component image data, and then compression is performed.
- the single-component image data refers to image data including only one component among a plurality of components constituting a color. Data representing a color image represents the three primary colors of light
- R, G, B (red, green, blue) are composed of three components of data.
- Power which represents luminance and chrominance, and YUV (luminance, chrominance, chrominance) are often composed of three components.
- Single-component image data refers to image data that contains only one component, such as only the R component, only the Y component, and so on.
- a decompression device for compressed image data at least one piece of single-component image data for a plurality of pieces of color-related single-component image data, which can be obtained by sampling image data of a predetermined area, is obtained.
- the compressed image data is divided into a plurality of single-component image data, and the plurality of single-component image data is converted into a larger number of single-component image data.
- the plurality of simple components obtained by decompressing the compressed image data It is characterized by combining the divided image data, converting a plurality of single component image data from the plurality of single component image data into the plurality of single component image data, and then performing restoration.
- the present invention provides a compression apparatus for image data, wherein each of three single-component image data of RGB components has a predetermined color among a plurality of pixels arranged in the horizontal and vertical directions, each of which has individual color information.
- the pixels obtained by performing the above sampling are combined with each other by removing pixels that have not been sampled for the R component and the B component single component image data and moving them in the horizontal and vertical directions.
- the G component single component image data is divided into two G1 component and G2 component single component image data such that pixels evenly separated from each other in the horizontal and vertical directions have the same component, and are not sampled.
- the three pixels of the R, G, and B components are combined into an RG 1 G 2 B component by removing the pixels and moving them in the horizontal and vertical directions and joining them together. It is characterized in four rows Ukoto compressed after conversion to a single-component image data.
- the compression may be performed after the converted four single-component image data of the RG1G2B component is converted into four single-component image data of the YUVGG two component.
- the present invention relates to an image data restoring apparatus, wherein a predetermined one of a plurality of pixels arranged in the horizontal and vertical directions, each of which has individual color information in each of three single-component image data of RGB components. Pixels obtained by performing the above sampling are removed from the R component and the B component single component image data by removing the unsampled power pixels and moving them in the horizontal and vertical directions. / ⁇ , two single component images of the G1 component and the G2 component of the G component single component image data so that pixels evenly separated from each other in the horizontal and vertical directions have the same component. Divide the data and remove the unsampled pixels to make them horizontal.
- the restoration may be performed after converting the four single-component image data of the YUVG2 component into the four single-component image data of the RG1G2B component.
- the present invention relates to a compression apparatus for image data, wherein each of three single-component image data of a YUV component has individual color information and includes a plurality of pixels arranged in horizontal and vertical directions. From the above, one pixel is extracted for every four pixels for the single component image data of the Y component, while one pixel is extracted for every two pixels for the single component image data of the U component and the V component. The pixels obtained by performing sampling are extracted in the horizontal or vertical direction with respect to the single component image data of the U component and the V component, excluding the unsampled pixels. The two component image data of the Y component and the Y component are combined so that pixels that are evenly separated from each other in the horizontal and vertical directions have the same component. Moving them horizontally and vertically while combining them into data and removing unsampled pixels, It is characterized in that compression is performed after converting three single-component image data of YUV component into four single-component image data of two Y1UVY components.
- the present invention provides an image data restoration apparatus, wherein each of three single component image data of a YUV component has individual color information and is selected from a plurality of pixels arranged in horizontal and vertical directions.
- the single component image data of the Y component one pixel is extracted for every four pixels.
- the single component image data of the U component and the V component one pixel is extracted for every two pixels. In this way, the pixels obtained by performing sampling are moved in the horizontal or vertical direction by excluding the unsampled pixels in the single-component image data of the U component and the V component.
- the two components of the single component image data of the Y component are divided into two components, a Y1 component and a Y2 component, such that pixels evenly separated from each other in the horizontal and vertical directions have the same component.
- the three single component image data of the YUV component is divided into four components of Y1UVY by dividing them into component image data and moving them in the horizontal and vertical directions while removing strong pixels that have not been sampled.
- the V component single component image data the pixel obtained by performing the sampling is moved in the horizontal or vertical direction to return to the original position, and the single component image of the Y1 component and the Y2 component
- the pixels obtained by performing the above-mentioned sampling by combining the single-component image data and moving them in the horizontal and vertical directions are returned to the original positions. It is characterized in that restoration is performed after converting the four single component image data of the Y1UVY two component into the three single component image data of the YUV component.
- the method of moving may be predetermined with the compression device, or may use data from the decompression device side in the compression device. You may be told.
- the present invention also provides a compression apparatus for image data, comprising: means for sampling each of the plurality of predetermined components with respect to image data composed of a plurality of predetermined components. Means for creating more than the plurality of single-component image data composed of a part of any one of the components; and means for compressing the single-component image data, further comprising: It is characterized in that at least two are composed of the same component among the predetermined components.
- the predetermined plurality of components may be three components of RGB or YUV.
- the compression device according to the present invention can include means for converting the single-component image data into single-component image data composed of other components having different properties.
- the image data input to the compression device according to the present invention is composed of three components of RGB, and the single component image data created by sampling these components is four of RGGB. That is, a plurality of G component single component image data are created.
- a sampling method for example, it is preferable to sample one pixel for every four pixels for the R and B components and one pixel for every two pixels for the G component.
- the three components of R, G, and B are converted to have the attributes of Y, U, and V, respectively.
- compress the four single component image data of YU VG For compression, JPEG or JPEG 2000 can be used, but it is more convenient to compress with JPEG 2000.
- the present invention also provides a decompression device for image data, comprising: means for decompressing the compressed image data to return to the single-component image data for the compressed image data compressed by the compression device according to the present invention; And a means for combining and extending two or more single-component image data composed of the same component among the plurality of predetermined components.
- Recovery according to the invention may further comprise means for converting the single-component image data into single-component image data composed of other components having different properties.
- the restoring device according to the present invention further includes: means for creating first restored image data from the plurality of single component image data; and means for creating second restored image data from the plurality of expanded single component image data. And can be configured to switch and output one of the first restored image data and the second restored image data.
- the compressed image data input to the decompression device according to the present invention is decompressed in the same manner as the method used for compression by the compression device. That is, decompression is performed. If the data decompressed in this way is four single-component image data each having a YUVG component, the three YUV components are converted into RGB components, respectively. Next, the single-component image data of the R and B components are each expanded to a size twice as large in the vertical and horizontal directions. Since there are two G component single component image data, these are combined and expanded to the same size as the R and B components. Finally, image data composed of three components of RGB is output.
- the restoration apparatus can switch between output data composed of single-component image data before decompression and data composed of decompressed data.
- the image data compression or decompression device according to the present invention can be configured as one compression and decompression device having both of these features.
- the compression device, the decompression device, and the compression / decompression device are often implemented as a program for operating a computer as the image data compression device, the decompression device, or the compression / decompression device according to the present invention. That is, the present invention provides a computer comprising: means for acquiring image data composed of a plurality of predetermined components; means for sampling each of the plurality of predetermined components; and any one of the plurality of predetermined components from the sampled data.
- Consists of some of the components Means for creating single-component image data by more than the plurality; operating as means for compressing the single-component image data; and at least two of the single-component image data, It can be expressed as a compression program characterized by operating as if it were the same component. Or a means for decompressing the compressed image data back to the single-component image data by decompressing the compressed image data by the computer with respect to the compressed image data compressed by the compression program or the compression device according to the present invention; and decompressing the single-component image data.
- J PEG or J P E 200 000 may be used for the compression or decompression.
- FIG. 1 is a diagram for explaining the configuration of a PC according to the first embodiment of the present invention relating to image capture and compression.
- FIG. 2 is a conceptual diagram showing a compression method using JPEG.
- FIG. 3 is a diagram illustrating a configuration of the PC according to the first embodiment of the present invention, which is related to the restoration of compressed data.
- FIG. 4 is a flowchart illustrating the operation of the compression device according to the present invention.
- FIG. 5 is a flowchart illustrating the operation of the restoration apparatus according to the present invention.
- FIG. 6 is a diagram for explaining a configuration relating to image capture and compression of a PC according to the second embodiment of the present invention. ⁇
- FIG. 7 is a diagram illustrating a configuration of a PC according to the second embodiment of the present invention, which is related to the restoration of compressed data.
- a PC personal computer
- This PC is connected to the Internet and can send and receive data such as images via the Internet. It can also be connected to a digital camera, etc., and import image data from a digital camera, etc.
- a PC to which the present invention is applied can transmit an image captured from the Internet, a digital camera, or the like according to the present invention, and can restore and output a received compressed image according to the present invention.
- PC described below is an example of a medium to which the present invention can be preferably applied, and it goes without saying that the present invention is not limited to a PC, but can be applied to various other digital devices such as a digital camera. Mona! / ,.
- the input unit 11 is a part that is connected to an external device such as a digital camera and captures image data into the PC. This may use a well-known scheme such as USB. Alternatively, a configuration may be made so that an image data can be downloaded from a server on the Internet by connecting to the Internet. In this case, a method such as Ethernet may be used.
- Image data in a format generally used at present is often composed of three single-component image data (plane) of RGB or YUV. Note that the properties are slightly different between RGB and YUV.
- image data composed of RGB has been imported, and these are shown in FIG. 1 as 110 (R: red image), 111 (G: green image), 1 1 2 (B: blue image).
- Each of the single component image data 113, 114, 115 includes a plurality of pixels.
- Each pixel has unique position information and color information in each of the single-component image data 113, 114, and 115.
- the color information includes, for example, luminance and the like, and the color information of each pixel in each single-component image data can be represented by, for example, 8 bits.
- the down-sampling unit 12 is a unit that samples color information from each of the single-component image data 110, 111, and 112 of the RGB component. Sampling is preferably performed within a range where deterioration of the image can be tolerated, and preferably by a method that facilitates interpolation. As a preferable sampling method, for example, a sampling method based on an array of primary colors can be considered. As is well known, the primary color Bayer arrangement is one of the RGB arrangement methods, in which G components are arranged in a pine pattern, with R and B components between them. They are arranged alternately. According to the present invention, color information is sampled at predetermined positions of each of the single-component image data 110, 111, and 112 of RGB components according to this arrangement.
- Figure 1 shows the results obtained by performing sampling based on the primary color system distribution IJ (in this case, especially the so-called RGGB type). It is shown conceptually for each of 21 and 122. In the drawing, for example, for the single component image data 120 of the R component, a portion indicated by “ ⁇ ” indicates a sampled pixel.
- the B-component single-component image data 122 is the same as the R-component single-component image data 122. As is clear, when sampling is performed based on this primary color Bayer array, one pixel is extracted from eight pixels for each of the single-component image data 120 and 122 of the R component and the B component.
- color information for a total of four pixels is obtained, and for the G component single-component image data 121, color information for a total of eight pixels is obtained by extracting one pixel for every four pixels.
- the human eye is the most sensitive to the G component of the RGB component because it obtains more information about the G component than the R and B components. It is believed that this is the case).
- the sampling method does not necessarily need to be based on the above method. For example, color information for four pixels may be selected for single-component image data of the G component and B component, and color information for eight pixels may be selected for single-component image data of the R component. Further, sampling may be performed based on a so-called GRBG type among primary color Bay arrays. However, in order to prevent image deterioration at the time of restoration, the pixels of the RGB components are equally spaced apart from each other in the horizontal and vertical directions as regularly as possible in the primary color Bay array described above, for example, as in the primary color Bay array. It is preferable to perform sampling in a state where the sensor is closed.
- the decomposing unit 13 converts the three single-component image data of RGB components obtained by performing sampling into four single-component image data of RG 1 G 2 B components, and outputs each single-component image data. That is, in each single-component image data, at least one pixel that has not been sampled is eliminated (removed) to obtain single-component image data smaller than the original single-component image data.
- Preferred reduction methods are, for example, all that were not sampled by the down sampling , The pixels sampled are removed, and the sampled pixels are moved in the horizontal and vertical directions to be arranged adjacent to each other or to be combined with each other.
- each single-component image data after processing in the decomposing unit 13 can be viewed as a data obtained by simply reducing the size of the original image.
- FIG. 1 conceptually shows four single-component image data 130, 131, 132, and 133 generated by the processing in the decomposing unit 13.
- the processing in the decomposing unit 13 causes the R component and B component of 4 ⁇ 4 pixels of the three single component image data 120, 121, and 122 of the RGB component to be output.
- the single-component image data 120 and 122 are reduced by the preferred method described above to obtain 2 ⁇ 2 pixel (half resolution) R-component and B-component single-component image data 130 and 133, and 4 ⁇ 4 pixels
- the G component single-component image data 121 is divided into two and reduced by the preferred method described above to obtain a 2 ⁇ 2 pixel (half resolution) G 1 component and G 2 component single component image.
- the data are 131 and 132.
- the single-component image data 131 of the G1 component is a single component representing color information of the pixel indicated by “ ⁇ ⁇ ” among the pixels sampled by the down sampling unit shown in FIG.
- single-component image data 132 of the G2 component is single-component image data representing color information regarding a pixel at a location indicated by “ ⁇ ”. Since the single-component image data 131 of the G1 component and the single-component image data 132 of the G2 component are elements constituting the single-component image data of the G component, it is apparent that the original Thus, complete single-component image data 121 of the G component can be obtained.
- the single-component image data of the G1 and G2 components 131, 13 2 is formed by regularly dividing the G component single-component image data so that pixels separated from each other in the horizontal and vertical directions have the same component, for example, as shown above.
- the designer can freely determine which part of the G component is the G1 component or the G2 component.
- the G component single-component image data 131 and the G two-component single component image data 132 are, as it were, the G components of the original image. Therefore, it can be said that the image is reduced.
- the processing in the decomposing unit 13 the data amount in the input unit 11, that is, 4 X4 (the number of pixels in the basic area) X 3 (the number of single component image data) X8
- the processing in the data composer 13 reduces the data amount as a whole, but on the other hand, the position information of each pixel is lost. However, the lost position information is stored in the decomposing unit 13 and the down sampling unit 12 at the time of restoration (to be described later in particular).
- the RGB-YUV converter 14 converts the RGB components to YUV components in a manner well known to those skilled in the art.
- four single-component image data 130, 131, 132, and RG 1 G 2 B components generated by the processing in the decomposing unit 13 are shown.
- (133) is formed. Note that the conversion to YUV is performed because JPEG or the like is used in the compression unit described below.
- the compression unit 15 converts the three single component image data 140, 141, 142 of the YUV component and the single component image data 143 of the G component obtained by the processing in the decomposing unit 13 into, for example, J Compress using PEG or J PEG2000.
- J Compress using PEG or J PEG2000.
- various methods generally used for image compression can be used, and are not limited to JPEG or the like. Since these compression methods are well known, a detailed description of these methods themselves is omitted here.
- the information in the basic area can be, for example, data of about 6 bits as a whole.
- the YUV component When compression is performed using JPEG, as shown in Fig. 2, the YUV component
- the information about the three single-component image data 140, 141, and 142 is compressed as one file, for example, fi 1 e.1, and the information about the G two-component single-component image data 143 is stored in another file, for example. Compressed as fi 1 e.
- the reason that the G2 component is compressed as a separate file is that the G2 component needs to be processed twice by JPEG. This will be apparent to those skilled in the art.
- each of the single component image data 140, 141, 142, and 143 of the YUVG2 component can be compressed for each single component image data.
- four files are formed, and the relation between them can be clarified by the file names or the like as in the above.
- the output unit 16 outputs the file compressed by the compression unit 15.
- the output may be for saving the file on a recording medium or for sending to a server on the Internet.
- the input unit 31 reads data compressed by the method according to the present invention from a recording medium, Or download such data from a server on the Internet c
- the decompression unit 32 decompresses the file compressed by the compression unit (15 in FIG. 1) using a method corresponding to the compression method used on the transmission side, and converts the file into three units of YUV components of 2 ⁇ 2 pixels.
- the component image data 320, 321, and 322 and the 2 ⁇ 2 pixel G2 component single component image data 323, ie, a total of four single component image data are returned.
- These single-component image data are exactly the same as the four single-component image data (140, 141, 142, and 143 in Fig. 1) of the two YUVG components before being compressed by the compression unit (15 in Fig. 1). You can think.
- the YUV-RGB conversion unit 33 performs a process opposite to the process in the RGB-YUV conversion unit (14 in FIG. 1) on the transmission side.
- the three single component image data 320, 321 and 322 of the YUV component are converted into three single component image data 330, 331 and 332 of the RG1 B component before conversion. .
- the remaining G-component single-component image data 323 is not processed by RGB-YUV (14 in Fig. 1).
- FIG. 3 by the processing in the YUV-RGB conversion unit 33, four single-component image data 330, 331, 332, RG1G2B components of 2 ⁇ 2 pixels, respectively. 333 are formed.
- the composing section 34 is a section provided corresponding to the decomposing section (13 in FIG. 1).
- the composer 34 is the de-composer (Fig. 1
- Each single-component image data is expanded to its original size by reflecting it on the three single-component image data of RGB components (that is, the reduced single-component image data is returned to the original size).
- Decompression can be performed, for example, by moving the pixels sampled by the down-sampling unit (12 in FIG. 1) in the horizontal and vertical directions to return to the original position. With this operation, the position information lost in the processing in the decomposing unit (13 in FIG. 1) is reflected on each single-component image data of the RGB component.
- FIG. 3 conceptually shows three single-component image data 340, 341 and 342 generated by the processing in the composer 34.
- the processing in the composer 34 causes the R component of each 2 ⁇ 2 pixel and the single component image data 330 and 333 of the B component to become the R component of 4 ⁇ 4 pixels (full resolution).
- the G1 component and G2 component single component image data 331 and 332 of 2 ⁇ 2 pixels are combined with the G component and expanded. , 4 ⁇ 4 pixels (resolution) of G component single component image data 341.
- the interpolator 35 interpolates the color information lost by sampling in the down-sampling unit (12 in FIG. 1) of the transmitter.
- the data is expanded by this interpolation.
- various methods for pixel interpolation and an interpolation method according to the calculation capability of the apparatus and the required image quality may be used.
- the simplest interpolation method is to copy the same value as a pixel with data to a neighboring pixel without data.
- three single-component image data 350, 351 and 352 of RGB components are generated. Note that the arrows in the drawings schematically show the movement of data when performing interpolation. Thus, the restoration of the original color image is completed.
- the output unit 36 outputs the restored original color image, that is, restored image data.
- the output unit 36 may be a display that displays a color image.
- the output unit 36 may be a storage medium that simply stores three single-component image data of RGB components without particularly restoring a color image.
- the output unit 36 can be provided between the decompression unit 32 and the YUV-RGB conversion unit 33 or between the YUV-RGB conversion unit 33 and the composing unit 34.
- the YUVG two-component single-component image data 320 to 323 RGl G2B single-component image data 3330 to 333 are obtained. No image is obtained.
- the output unit 36 may be provided between the decompression unit 32 and the YUV-RGB conversion unit 33 described above, or between the YUV-RGB conversion unit 33 and the composing unit 34.
- the technique of the present invention in order to obtain a complete image, it is necessary to know the processing in the composer 34, and it has a decomposer (13 in FIG. 1). Although it is necessary, even if the processing in the composer 34 is not known, and even if it does not have the data composer (13 in FIG. 1), based on the data received from the transmitting side. It means that you can see the image with some accuracy.
- FIG. 4 shows the operation of the compression device.
- a color image is taken into the device by the input unit (step 1).
- predetermined information is sampled from each pixel of each single component image data by the down-sampling unit (120 to 122 in FIG. 1) (step 2).
- the decomposing unit converts the sampled three single-component image data of RGB components into four single-component image data of RG1G2B components, and reduces each single-component image data. (130-133 in Fig. 1) (Step 3).
- the RGB—YUV converter converts the RG 1 B component into a YUV component (step 4).
- three single component image data of the YUV component and single component image data of the G 2 component, for a total of four Single component image data (140 to 143 in Fig. 1) is formed.
- the information on the four single component image data of the YUVG two components is compressed using JPEG or the like (step 5), and finally, the file is output at the output unit (step 6).
- Figure 5 shows the operation of the restoration device.
- the file is received by the input unit (step 1), and then the compressed file is decompressed by the decompression unit, and converted into four single component image data of YUVG two components (320 to 323 in FIG. 3).
- the relevant information is decrypted (step 2).
- the YUV-RGB conversion unit converts the YUV component into RGB components, and the three single-component image data of the RG1 B component before conversion and the single-component image data of the G2 component, for a total of four single-component image data (Steps 3 to 333 in FIG. 3) are formed (Step 3).
- the four single-component image data of RG 1 G 2 B components are converted into three single-component image data of RGB components by the composer, and the positional information lost in the decomposer is obtained. Is reflected in the converted three single-component image data of the RGB component, and each single-component image data is expanded to its original size (340 to 342 in FIG. 3) (step 4). Thereafter, the interpolation unit recovers the color information lost in the processing in the down-sampling unit by interpolation, and restores the original color image (step 5). Finally, it can be output or displayed as restored image data (step 6). As described above, the output stage may be provided between step 2 and step 3 (step 6 ') or between step 3 and step 4 (step 6 ").
- the resolution of the restored image data that can be output in steps 6 and 6 " is different from that of the restored image data output in step 6.
- a switching device (not shown) may be provided so that a user can freely select and output these various types of restored image data.
- the restored image data that can be output in steps 6 'and 6 " that is, an output image composed of one single component image data (in this case, a semi-resolution image)
- the color image can be the same size as before compression.
- the color image is described as being represented by the RGB component. 1 This may be represented by the YUV component.
- the RGB-YUV converter (14 in FIG. 1) and the corresponding YUV-RGB converter (33 in FIG. 3) are unnecessary.
- the second embodiment will be described with reference to FIGS. 6 and 7, focusing on differences from the first embodiment. 6 and 7 correspond to FIGS. 1 and 3 in the first embodiment, respectively. Items not particularly described may be considered in the same manner as in the first embodiment.
- an input unit 51 takes in YUV format data composed of single component image data 510, 511, and 512 of YUV components.
- YUV format data composed of single component image data 510, 511, and 512 of YUV components.
- data of 4 X 4 pixels is included for the Y component, the U component and the V component
- data of 4 X 2 pixels is included.
- the down-sampling unit 52 extracts one pixel for every four pixels from the single-component image data 510 of the Y component, so that, for example, as shown in FIG. 6, the primary colors described in FIG.
- the single-component image data 520 of the Y component is obtained.
- the single-component image data 5 11 and 5 12 of the U component and the V component by extracting one pixel for every two pixels, for example, as shown in FIG.
- the single-component image data of the U and V components is obtained. 52 1 and 5 22 are formed.
- the decomposing unit 53 converts the sampled three single-component image data 520, 521, and 522 of the YUV component into four single-component image data of two Y1UVY components, Reduce the image data (530, 531, 5332, 533 in Fig. 6).
- the single component image data 530 and 531 of the Y1 component and the Y2 component are the single component image data of the G1 and G2 components in the first embodiment (131, 1 in FIG. 1). 3 2)
- the single-component image data 532 and 533 of the U component and the V component are the single-component image data of the R component and the B component in the first embodiment (130, 13 in FIG. 1). It can be considered as equivalent to 3).
- the processing in the decomposing unit 53 the three single component image data 520, 522, and 522 of the YUV component are converted into the single component image data 520 of the Y component of 4 ⁇ 4 pixels.
- the image is divided into two and reduced to obtain single-component image data 530,531 of 2X2 pixels (half resolution) of Y1 and Y2 components, while the U and V components of 4X2 pixels are
- the single-component image data 521 and 522 are reduced to single-component image data 532 and 533 of 2 ⁇ 2 pixels of a U component and a V component.
- the compression unit 54 compresses information on the four single-component image data 530 to 533 of two Y1UVY components using, for example, JPEG2000. In this case, since the processing by JPEG2000 is not performed twice as in the G2 component of the first embodiment, it can be formed as one file.
- the output unit 55 outputs this file.
- an input unit 71 receives a file.
- the decompression unit 71 decompresses this file using a compression method corresponding to the compression method used at the time of compression, and as shown in FIG. 7, four single pixels of 2 ⁇ 2 pixels, Y 1 UVY 2 components. Return to component image data 720-723.
- the composer 73 converts the four single-component image data 720-723 of the Y1UVY2 component into three single-component image data 730 to 732 of the YUV component, and loses the data in the decomposer.
- Each single-component image data is expanded to its original size by reflecting the obtained position information on the three single-component image data of the converted YUV component. That is, by the processing in the composer 73, the U component of each 2 ⁇ 2 pixel and the single component image data 722 and 723 of the V component are expanded and the U component of 4 ⁇ 4 pixels (full resolution) are expanded.
- the V-component single-component image data 731 and 732 are obtained.
- the Y1 and Y2-component single-component image data 720 and 721 of each 2X2 pixel are combined with the Y component and expanded to obtain 4 X4 pixel data. (Full resolution) Y component single component image data 730.
- the trapping unit 74 performs interpolation on the single-component image data 740 of the Y component, for example, in the same manner as the single-component image data of the G component (341 in FIG. 3) in the first embodiment.
- the locations sampled by the decomposing unit (53 in Fig. 6) for example, the pixels in the first and third rows are sampled immediately below. Missing parts, eg lines 2 and 4 To perform interpolation. This interpolation method is well known to those skilled in the art and will not be described in detail here.
- each of the transmitter and the receiver has been described as being divided into a plurality of parts.
- this classification is for the purpose of explanation only.
- the function of the input unit on the transmitting side and the function of the down-sampling unit are often executed at once.
- a color image is generally detected in a state where it is sampled from the beginning using a detector having a plurality of detection elements that detect only a specific color component. Therefore, these classification methods are not important for the present invention.
- the G component is divided into two components G1 and G2, or the Y component is divided into two components Y1 and Y2. There is no need to divide it, you may divide it further. It is enough if the image is finally obtained by combining.
- the present invention only the embodiment relating to the single component image data of the RGB component and the Y UV component has been described, but the present invention is similarly applied to the case where the information regarding the color is expressed by the same single component image data. It would be possible. Further, an important feature of the present invention is that the single component image data relating to color is divided, and the present invention is not limited to the invention described in the embodiment of the present invention.
- the image data compression or decompression device according to the invention can also be configured as one compression and decompression device having both of these features.
- the compression device, the decompression device, and the compression / decompression device may be implemented as a program that causes a computer to operate as the image data compression device, the decompression device, or the compression / decompression device according to the present invention.
- image data can be transmitted and received with a smaller data amount than before.
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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AU2002368463A AU2002368463A1 (en) | 2002-12-18 | 2002-12-18 | Image data compression device and decompression device and image data compression program and decompression program |
JP2004560583A JP4012201B2 (ja) | 2002-12-18 | 2002-12-18 | 画像データの圧縮装置及び復元装置、並びに画像データの圧縮プログラム及び復元プログラム |
EP02790801A EP1575262A4 (en) | 2002-12-18 | 2002-12-18 | DATA-IMAGE COMPRESSION DEVICE AND DECOMPRESSION DEVICE AND IMAGE-DATA COMPRESSION PROGRAM AND DECOMPRESSION PROGRAM |
PCT/JP2002/013221 WO2004056084A1 (ja) | 2002-12-18 | 2002-12-18 | 画像データの圧縮装置及び復元装置、並びに画像データの圧縮プログラム及び復元プログラム |
US11/153,160 US20050286778A1 (en) | 2002-12-18 | 2005-06-15 | Compression unit, decompression unit for image data and programs for compressing and decompressing image data |
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PCT/JP2002/013221 WO2004056084A1 (ja) | 2002-12-18 | 2002-12-18 | 画像データの圧縮装置及び復元装置、並びに画像データの圧縮プログラム及び復元プログラム |
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US (1) | US20050286778A1 (ja) |
EP (1) | EP1575262A4 (ja) |
JP (1) | JP4012201B2 (ja) |
AU (1) | AU2002368463A1 (ja) |
WO (1) | WO2004056084A1 (ja) |
Cited By (5)
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JP2006121669A (ja) * | 2004-10-19 | 2006-05-11 | Microsoft Corp | 可逆の色変換を用いてモザイク状画像データをエンコードするためのシステムおよび方法 |
WO2010055893A1 (ja) | 2008-11-13 | 2010-05-20 | Oya Nagato | 樹状形式によるデータ処理方法およびデータ処理装置 |
US8948523B2 (en) | 2008-05-29 | 2015-02-03 | Nagato Oya | Data processing method in tree form and data processing device |
CN114189689A (zh) * | 2021-11-25 | 2022-03-15 | 广州思德医疗科技有限公司 | 图像压缩处理方法、装置、电子设备和存储介质 |
CN115150390A (zh) * | 2022-06-27 | 2022-10-04 | 山东信通电子股份有限公司 | 一种图像显示方法、装置、设备及介质 |
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US20070201058A1 (en) * | 2006-02-28 | 2007-08-30 | Texas Instruments Incorporated | Systems and methods for indirect image data conversion |
US8200959B2 (en) * | 2007-06-28 | 2012-06-12 | Cisco Technology, Inc. | Verifying cryptographic identity during media session initialization |
US8417942B2 (en) | 2007-08-31 | 2013-04-09 | Cisco Technology, Inc. | System and method for identifying encrypted conference media traffic |
US8837598B2 (en) * | 2007-12-28 | 2014-09-16 | Cisco Technology, Inc. | System and method for securely transmitting video over a network |
US20090169001A1 (en) * | 2007-12-28 | 2009-07-02 | Cisco Technology, Inc. | System and Method for Encryption and Secure Transmission of Compressed Media |
EP2528319A1 (en) * | 2011-05-23 | 2012-11-28 | Alcatel Lucent | Image data compressing and decompressing methods and devices |
US10721470B2 (en) | 2018-07-06 | 2020-07-21 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Compression of a raw image |
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- 2002-12-18 AU AU2002368463A patent/AU2002368463A1/en not_active Abandoned
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- 2002-12-18 EP EP02790801A patent/EP1575262A4/en not_active Withdrawn
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JP2006121669A (ja) * | 2004-10-19 | 2006-05-11 | Microsoft Corp | 可逆の色変換を用いてモザイク状画像データをエンコードするためのシステムおよび方法 |
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KR101201047B1 (ko) * | 2004-10-19 | 2012-11-14 | 마이크로소프트 코포레이션 | 가역성의 색 변환을 채용하는 모자이크된 이미지 데이터를인코딩하는 시스템 및 방법 |
US8948523B2 (en) | 2008-05-29 | 2015-02-03 | Nagato Oya | Data processing method in tree form and data processing device |
WO2010055893A1 (ja) | 2008-11-13 | 2010-05-20 | Oya Nagato | 樹状形式によるデータ処理方法およびデータ処理装置 |
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CN114189689B (zh) * | 2021-11-25 | 2024-02-02 | 广州思德医疗科技有限公司 | 图像压缩处理方法、装置、电子设备和存储介质 |
CN115150390A (zh) * | 2022-06-27 | 2022-10-04 | 山东信通电子股份有限公司 | 一种图像显示方法、装置、设备及介质 |
CN115150390B (zh) * | 2022-06-27 | 2024-04-09 | 山东信通电子股份有限公司 | 一种图像显示方法、装置、设备及介质 |
Also Published As
Publication number | Publication date |
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JPWO2004056084A1 (ja) | 2006-04-20 |
EP1575262A4 (en) | 2010-02-24 |
AU2002368463A1 (en) | 2004-07-09 |
EP1575262A1 (en) | 2005-09-14 |
US20050286778A1 (en) | 2005-12-29 |
JP4012201B2 (ja) | 2007-11-21 |
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