WO2005101849A1 - 圧縮画像データファイルの作成方法、画像データ圧縮装置及び撮影装置 - Google Patents
圧縮画像データファイルの作成方法、画像データ圧縮装置及び撮影装置 Download PDFInfo
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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
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/146—Data rate or code amount at the encoder output
- H04N19/152—Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
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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
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/124—Quantisation
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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 creation of a compressed image data file: a method, an image data compression device, and a photographing device.
- a digital camera which is a dedicated camera, usually has a function for estimating the number of remaining shots so that users can be notified if they can take another shot.
- one physical film was consumed for each shot, so the number of remaining shots could be clearly known.
- the data size of the image data file generated for each photographing is usually not a fixed value. However, it is not possible to clearly know the number of photos that can be taken.
- the remaining number of images that can be shot is estimated by reducing the variation in the data size of the image data file generated for each shooting and by making the value as constant as possible.
- the functions that enable it are implemented.
- the reason that the data size of the image data file differs for each photographing in the digital photographing machine is that the image data is compressed. More to data storage media In order to store the image data, the image data is usually stored in a compressed state on a data recording medium. This compression involves one or more compression parameters, and the compression factor called the Q factor or Q table is involved in the JPEG compression used in current digital cameras.
- the data size of the compressed image data varies depending on the content of the captured image even if the data is compressed using the same parameters. For this reason, if the values of the compression parameters are the same for all image data, the size of the data file of the generated compressed image differs for each shooting, which makes it difficult to predict the number of remaining shots. . Therefore, as described in Japanese Patent Application Laid-Open No. Hei 4-1233333, a conventional dedicated photographing device compresses image data created by photographing with several different compression parameter values to obtain desired data. If the compressed image data can be compressed to the size, the compressed image data is used for the image data file to be finally saved, that is, the compressed image data file, and the data size of the generated compressed image data file is always kept constant. Like that. Therefore, the value of the compression parameter used for compressing the image data differs for each photographing.
- FIG. 13 is a block diagram of a conventional dedicated photographing machine.
- the digital camera 202 which is a dedicated camera, has a lens 204, a solid-state image sensor 206, a / 0 converter 208, a DSP 210 for image processing, a CPU 212, and a main storage device 2. 14, an external storage device 2 16, a display 2 18, a user interface 220 such as a shutter button, etc., and signals are exchanged with these devices via a bus 222.
- the CPU 212 issues a command to start shooting, and the light passing through the lens 204 is converted into an electric signal by the solid-state image sensor 206, and the electric signal is transmitted. Is digitized by the AZD converter 208 and temporarily stored in the main storage device 214.
- the solid-state imaging device 206 All signals output from the pixels are stored in the main storage device 214 as digital data.
- the output signal of the solid-state image sensor 206 which is stored in the DSP 210 main storage device 214, is read out, and one frame of image data is created from the data. I do. Image data is in RGB or YUV format.
- the DSP 210 temporarily stores the created one-frame image data in the main storage device 21 again.
- the DSP 210 reads out the image data for one frame previously created from the main storage device 214, sets the compression parameter to a predetermined value, and JPEG-compresses the compressed image data file. Prepare and measure the data size of the compressed image data file. If the data size is not the desired data size, the compressed image data file is discarded, the previously created image data is read out again from the main storage device 214, and the JPEG compression is performed again by changing the compression parameter value. And measure the data size after compression. The DSP 210 repeats the above operation to produce the final output compressed image data from the image data compressed according to the compression parameter value of the desired data size, and stores it in the main storage device 21 Save to 6.
- the method of creating a compressed image data file implemented by a conventional digital camera uses the entire image data to be compressed.
- a method is used in which compression is performed using a certain compression parameter value, the data size after compression is checked, and if the data size is larger than the desired size, the entire image data to be compressed is compressed again using another compression parameter value. are doing. Disclosure of the invention
- the method of producing a compressed image data file according to the present invention differs from the prior art in that the image data to be compressed is compressed to produce a compressed image data file.
- the step of extracting a portion of a predetermined size and the process of compressing the data of the portion by a predetermined method to create compressed partial data change the value of a compression parameter used in the predetermined method each time
- a predetermined number of pieces of compressed partial data compressed using different compression parameter values from one piece of data are created. This is done over the entire image data to be compressed, and for each of the above-mentioned compression parameter values, Calculate the total data size, and construct a compressed image data file that will be the final output from the compressed partial data compressed with the compression parameter value that is less than or equal to the predetermined threshold and that is the closest to the threshold. It is characterized by.
- the compressed image data file may be configured from the compressed partial data compressed with the compression parameter value that decreases.
- the predetermined method used for compression may be, for example, a JPEG method.
- JPEG compression When JPEG compression is used, Q factors or Q tables specified in JPEG can be used as compression parameters to be changed during the repetition processing.
- the present invention includes the following image data compression device. That is, the image data compression device is an image data compression device that compresses image data to create a compressed image data file, and includes a partial data acquisition unit that acquires image data to be compressed by a predetermined size. And a process of creating compressed portion data by compressing one part of the data by a predetermined method, and once a compression parameter value used for the predetermined method. By repeating a predetermined number of times while changing to a plurality of pieces of compressed partial data, one piece of partial data is compressed using different compression parameter values, and further, the plurality of pieces of compressed partial data are sequentially output.
- the image data compression device is an image data compression device that compresses image data to create a compressed image data file, and includes a partial data acquisition unit that acquires image data to be compressed by a predetermined size. And a process of creating compressed portion data by compressing one part of the data by a predetermined method, and once a compression parameter value used for the predetermined method.
- Compression means for each of the compression parameter values, for obtaining a total of the data sizes of all the compressed partial data compressed with the same compression parameter value, and wherein the total is equal to or less than a predetermined threshold value and And a data file composing means for composing the compressed image data file from the compressed partial data compressed using the compression parameter value closest to the threshold value.
- the compressed image data file may be configured from the compressed partial data compressed with the compression parameter value that minimizes the sum.
- the predetermined method used for compression may be, for example, a JPEG method.
- JPEG compression When JPEG compression is used, a Q factor or a Q table defined in the JPEG scheme can be used as a compression parameter to be changed during the repetitive processing.
- the present invention includes the following image data compression device. That is, the image data compression device is an image data compression device that compresses image data to create a compressed image data file, and includes an image data compression unit and a data file configuration unit.
- the image data compression unit includes: (A 1) a partial data acquisition unit that captures image data to be compressed for each part of a predetermined size and temporarily stores the data of the part; An interleave compression section for compressing the partial data stored in the acquisition section by a predetermined method to produce compressed partial data; and (A 3) a data output section for outputting the compressed partial data.
- the interleave compression unit includes a plurality of compression parameter values used for the predetermined method, and a plurality of compressed partial data compressed using different compression parameter values for one partial data.
- the data output unit sequentially outputs the plurality of compressed partial data
- the data file configuration unit includes: (B1) an output from the data output unit.
- a data input unit for inputting the compressed partial data obtained,
- B 2) a data storage unit for storing the compressed partial data input from the data input unit, and
- B 3) a compressed partial data input from the data input unit
- a data size calculation unit for calculating the total data size of all the compressed partial data created from the same image data and compressed with the same compression parameter value for each of the different compression parameter values for each of the different compression parameter values; and
- a data size determination unit that determines a compression parameter value whose sum is equal to or less than a predetermined threshold value and is a value closest to the threshold value as an optimal compression parameter value; and (B5) using the optimal compression parameter value
- a data shaping unit that configures the compressed image data file from the compressed compressed partial data.
- the data size determination unit can be configured to determine the compression parameter value with the smallest total as the optimal compression parameter value.
- the interleave compression unit can be configured to add a marker indicating the compression parameter value used for compression to the compressed partial data.
- the predetermined method used for compression may be, for example, a JPEG method.
- JPEG compression When JPEG compression is used, a Q factor or a Q table defined in JPEG can be used as a compression parameter.
- an RST marker defined by the JPEG standard as the marker.
- the imaging apparatus is an imaging apparatus including a camera module and a host module.
- the camera module includes (A 1) a part of a sensor that converts incident light into an electric signal, and (A 2) ) An image data construction unit for constructing image data from the electric signal; (A 3) a camera module side data storage unit for temporarily storing a part or all of the image data; and (A 4) a force camera module side.
- the image data stored in the data storage section is stored in a predetermined size section.
- a partial data acquisition unit that captures every minute and temporarily stores the data of the part;
- the interleave compression unit includes a plurality of values of compression parameters used for the predetermined method, and different values of the compression parameters for one partial data.
- the data transmitting unit sequentially transmits the plurality of compressed partial data, and (B) the host module comprises: (B1) ) A data receiving unit that receives data transmitted from the camera module; (B2) a host-side data storage unit that stores compressed partial data received by the data receiving unit; and (B3) a data input unit.
- a data size calculator for calculating the total data size of all the compressed partial data created from the same image data and compressed with the same compression parameter value for each of the partial data, for each of the different compression parameter values;
- a data size judging unit for judging a compression parameter value whose sum is equal to or smaller than a predetermined threshold value and is closest to the threshold value as an optimum compression parameter value;
- a data shaping unit that configures a compressed image data file including information obtained by compressing the entire image data from the compressed partial data that has been compressed, and (B6) a storage device that stores the compressed image data file. It is characterized by.
- the data size determination unit may be configured to determine the compression parameter value having the smallest total as the optimal compression parameter value. it can.
- the host module can be configured to have a telephone function.
- it may be configured to have a telephone function using a CDMA system.
- the photographing device according to the present invention has a function of previewing a photographed image. That is, the force 200, 108, the image data constructing unit 3 creates preview image data for preview from the electric signal before constructing the image data, and the data transmitting unit transmits the compressed partial data.
- the preview image data is configured to be transmitted to a host module, and the host module includes a display device and receives the preview image data and displays the preview image data on the display device.
- the data compression unit in the camera module, includes a partial data for preview image obtained by lowering a resolution of the partial data from the partial data.
- the data transmission unit is configured to sequentially transmit the preview image partial data and the plurality of compressed partial data generated from one of the partial data
- the host module includes: The preview image partial data is stored in the host-side data storage section, and the preview data of the image data is configured from the preview image partial data stored in the host-side data storage section by the data reduction section.
- a display device for displaying the preview image data on the display device. May be implemented.
- the interleave compression unit may be configured to add a marker indicating the compression parameter value used for compression to the compressed partial data.
- the predetermined method used for compression may be, for example, a JPEG method.
- a Q factor or a Q taper specified in the JPEG system can be used as the compression parameter value.
- an RST marker defined by the JPEG standard as the marker.
- FIG. 1 is a block diagram of a jif image data compression device according to the present invention.
- FIG. 2 is a flowchart illustrating the operation of the image data compression device according to the present invention.
- FIG. 3 is a diagram showing a state of interleave compression according to the present invention.
- FIG. 4 is a diagram showing a state of data output from the interleave compression unit of the image data compression device according to the present invention.
- FIG. 5 is a diagram showing how the total data size of the compressed partial data is measured and how the compressed partial data to be used for final output is selected.
- FIG. 6 is a diagram showing an outline of a hardware configuration of an image data compression device that creates a compressed image data file in the JPEG format, which is one embodiment of the present invention.
- FIG. 7 is a flowchart illustrating the operation of the interleave compression unit according to the first embodiment.
- FIG. 8 is a flowchart for explaining the operation of the data fining unit in the first embodiment.
- FIG. 9 is an external view of a camera-equipped mobile phone according to a second embodiment of the present invention.
- FIG. 1 ⁇ is a diagram schematically illustrating a hardware configuration of a camera-equipped mobile phone according to the second embodiment.
- FIG. 11 is a flowchart illustrating the operation of the camera module according to the second embodiment.
- FIG. 12 is a flowchart illustrating the operation of the host module according to the second embodiment.
- FIG. 13 is a block diagram of a digital camera according to the related art. BEST MODE FOR CARRYING OUT THE INVENTION
- a method for producing a compressed image data file is a method for producing a compressed image data file by compressing image data, wherein (1) a step of extracting a portion having a predetermined size from the image data; 2) By repeating the process of compressing the data of the portion by a predetermined method to create compressed partial data a predetermined number of times while changing the value of the compression parameter used for the predetermined method each time, Producing the predetermined number of the compressed partial data compressed by using different compression parameter values for one partial data, respectively, over the entirety of the image data.
- the compressed image data file is constituted by the compressed partial data compressed with the compression parameter value whose sum is equal to or less than a predetermined threshold value and is the value closest to the threshold value. It is a manufacturing method. A method for producing a powerful compressed image data file can be executed by hardware using an image data compression apparatus as shown in FIG.
- FIG. 1 is a diagram showing functional blocks of an image data compression device according to the present invention.
- the image data compression device 2 includes a partial data acquisition unit 4, an interleave compression unit 6, and a data file configuration unit 10.
- the partial data acquisition unit 4 includes a data acquisition control unit 14 that controls the extraction of partial data constituting a part of the original image data 12 to be compressed, and a buffer memory 1 that temporarily stores the extracted partial data. 6 is provided.
- the buffer memory 16 does not need to store the entire image data, but only needs to store a small part of the image data.
- the interleave compression section 6 compresses the partial data stored in the buffer memory 16 by a predetermined method to produce compressed partial data, and the operation and compression parameter values of the data compression circuit 18 Data compression control unit 20 for controlling
- the data compression circuit 18 has a plurality of compression parameter values used for the above-mentioned predetermined method.
- the compression method for example, the often lacking JPEG method can be considered.
- the compression parameters include the Q factor and Q table specified in the JPEG method. Changing the values of these compression parameters will change the data size and image quality after compression.
- the data compression control unit 20 operates the data compression circuit 18 by switching the value of the compression parameter each time and operating the data a predetermined number of times, thereby storing the data in the buffer memory 16; Create a plurality of compressed partial data using different compression parameter values. Therefore, a plurality of pieces of compressed partial data created using different compression parameter values from one piece of partial data are sequentially output from the interleave compression unit 6.
- the data file configuration unit 10 includes a memory controller 8, a RAM 9, a R ⁇ M 21, and a CPU 22.
- the RAM 9 stores the compressed partial data output from the interleave compression unit 6. Since the RAM 9 must store all compressed partial data created from the image data 12 to be compressed, the RAM 9 must have a considerably larger capacity than the buffer memory 16.
- the memory controller 8 compresses the storage destination address in the RAM 9 of the compressed partial data output from the interleave compression unit 6 according to the compression parameter value used for compression, thereby compressing the compressed partial data with the same compression parameter value.
- the compressed partial data is stored together in the same area in the RAM 9.
- the ROM 21 stores a program for operating the CPU 22 as an information processing device.
- the CPU 22 checks the data stored in the RAM 9 according to the program stored in the ROM 21 and obtains the total data size of all the compressed partial data compressed with the same compression parameter value for each compression parameter value.
- the compressed partial data compressed using a compression parameter value whose sum is equal to or less than a predetermined threshold value and is the closest to the threshold value.
- a compressed image data file which is the final output of the image data compression device 2 is constructed.
- the compressed image data file is obtained by compressing the entirety of the original image data 12.
- the compressed image data file is specified by the JPEG standard. File format.
- the configured compressed image data file is output to the outside as it is in the storage capacity of the external storage device 24.
- step S1 is the start of processing.
- the data acquisition control unit 14 takes out a predetermined size portion of the original image data 12 to be compressed from the storage unit in which the image data 12 is stored, and stores the portion in the buffer memory 16 Store.
- the data compression control 20 selects and sets the compression parameter value of the data compression circuit 18.
- the data compression control unit 20 reads out the partial data stored in the buffer memory 16. Either of steps S3 and S4 may be performed first, or they may be performed simultaneously.
- step S5 the data compression circuit 18 compresses the partial data read out in step S4 by a predetermined method using the compression parameter value set in step S3, and generates compressed partial data. I do.
- step S6 the generated data for 5 minutes of compression is output from the interleave compression section 6.
- step S7 it is determined whether or not steps S3 to S6 have been repeated a predetermined number of times. If not, the process returns to step S3.
- the data compression control unit 20 sets the value of the compression parameter of the data compression circuit 18 to a different value each time step S3 is repeated. For this reason, a plurality of pieces of compressed partial data that are compressed using different compression parameter values are created from one piece of partial data, and the plurality of pieces of compressed partial data are sequentially output from the interleave compression unit 6. become.
- Steps S3 to S6 are repeated for the number of compression parameter values used. 05108 Repeat t and proceed to step S8.
- step S8 it is determined whether all necessary parts of the image data 12 to be compressed have been extracted.
- Step S2 the process returns to step S2, and the data acquisition control unit 14 stores the data in the buffer memory 16. Discards the stored partial data 1 ", and extracts the data of ⁇ from the previous time from the image data 12 to be compressed and stores it in the buffer memory 16. The part newly stored in the buffer memory 16 As for the data, Steps S3 to S6 are repeated as many times as the number of compression parameters to be used, and a plurality of compressed partial data created from the partial data are sequentially output from the interleave compression unit 6. Step S As a result of the repetition in step 7 and step S 8, the output of the interleave compression unit 6 is obtained by compressing data confined with one compression parameter value with another compression parameter value The the data thus interleaving output.
- FIG. 3 is a schematic diagram showing a state of compression by the interleave compression unit 6.
- P 1; P 2 and P 3 indicate partial data constituting different parts of the original image data 12 respectively.
- the data compression control section 2 0 sets the value of the compression parameter of the data pressure 'condensation circuit 1 8 Q a (Step S 3)
- the partial data P i is read from the buffer memory 16 (step S 4), and the read is compressed using the compression parameter value Q a to generate compressed partial data P la (step S 5).
- Prepared compressed partial data P a is output from the interleave compression section 6 (Sutetsu flop S 6).
- step S 7 the data compression control section 2 0 is set to a different value Q b is the previous value of the compression parameter of the data compression circuit 1 8, are stored in the server Ffamemori 1 6 parts
- the data P is read (steps S3, S5).
- the data compression circuit 1 8 partial data compressed using the parameter value Q b a, to prepare the compressed partial data P lb (S 5).
- T JP2004 / 005108 Compress the partial data P, using the parameter value Q c , to generate compressed partial data P lc, and the partial data P i to generate the compressed partial data P ld, which is compressed using the parameter value Q d. .
- step S2 returns, and the partial data stored in the buffer memory 16 is discarded. stored in the buffer memory 1 6 takes out a P 2.
- step S 2 each parameter value Q a to Q d to produce a compressed partial data P 2a ⁇ P 2 [1, sequentially outputted (step S 3 ⁇ S 6).
- step S 8 the next partial data P 3 are read, likewise compressed partial data compressed by different that the parameter value Q a to Q d respectively to produce a P 3a ⁇ P 3d, to output sequentially (step S 3 ⁇ S 7).
- the data IJ output from the interleave compression unit 6 is as shown in FIG.
- FIG. 4 is a schematic diagram showing a state of data output from interleave compression section 6.
- the output of the interleave compression unit 6 is data obtained by compressing the same partial data, instead of data that is continuously compressed by the same compression parameter value as in the conventional technology.
- Several data compressed by different compression parameter values follow each other, and then another piece of data is followed by a number of data compressed by different compression parameters. That is, data compressed using a certain compression parameter value becomes an output interleaved with data compressed using another compression parameter value different from the compression parameter value. This is one feature of the present invention.
- steps S2 to S5 a step of extracting a predetermined size portion from the image data to be compressed, and a process of compressing the partial O data by a predetermined method to generate compressed partial data Is repeated for a predetermined number of times while changing the value of the compression parameter for each time, thereby using different compression parameter values for one piece of the partial data.
- V. A method of repeating the two steps of producing the predetermined number of compressed partial data compressed over the entire image data to be compressed is hereinafter referred to as interleave compression.
- step S9 When the entire processing of the image data to be compressed has been completed in step S8, the compression processing ends (step S9). Note that it is not necessary to perform the processing of steps S2 to S7 for all parts of the image data to be compressed, and it is possible to discard the data without compressing it. You do not need to do it.
- the data acquisition control unit 14 is to be subjected to the thinning processing of the image data 12 to be compressed, and the buffer memory 16 is used for the data of the part to be discarded (thinned out). Can be configured not to be stored in
- step S6 the compressed partial data output from the interleaved compressing section 6 is allocated to an appropriate area on the RAM 9 by the memory controller 8 in step S15; TL and step S11. Actually stored in RAM 9. Therefore, when the compression process is completed in step S9, the RAM 9 stores all the compressed partial data created by the interleave compression unit 6 in the same area for each compressed partial data compressed with the same compression parameter value. Will be stored.
- Step S 1 2 CPU 2 2 is, 'in accordance with a program stored in the ROM 2 1, regulating the compressed partial data stored in the RAM 9 base, all compressed in the same compression parameter value of the compression section data Determine the total data size for each of the compression parameters.
- step SL3 the total of the data size of the compressed partial data is selected and the compressed partial data compressed using the compression parameter value that is less than or equal to the threshold value and is closest to the threshold value is selected. I do.
- FIG. 5 is a schematic diagram showing a state of the compressed partial data stored in the RAM 9. In R AM 9, 004/005108 As shown in FIG.
- C a indicates a set of compressed partial data compressed using the compression parameter value Q a
- C b indicates a set of compressed partial data compressed using the compression parameter value Q b
- C e and C d denote a group of compressed partial data compressed using the compression parameter values Q c and Q d , respectively.
- the horizontal direction in FIG. 5 shows the data size. In this example, the data size of C a is the largest, and the data size of C d is the smallest. Then, the CPU 22 calculates the total data size of them according to the program stored in the ROM 21 (step S12). In ⁇ train shown in FIG.
- step S12 if the sum of the data sizes of the compressed partial data exceeds the threshold value, ie, any of the data sizes C a to C d in the example of FIG. If the total of the compressed partial data exceeds the threshold value, a set of the compressed partial data having the minimum total is selected. (In this example, it is C d .)
- step S14 the CPU 22 constructs a final compressed image data file to be output from the selected compressed partial data according to the program stored in the ROM 21.
- the compressed image data file contains the entire compressed information of the original image data 12.
- the compressed image data file is configured to have a file format defined by the JPEG standard. This completes the process of creating a compressed image data file (step S15), but the created compressed image data file is output to the outside for storage and the like.
- 3 Tsushi force P have P 2, P 3, although not described, it is naturally be composed actually ⁇ much larger number of parts .
- image data to be compressed as XGA that is, image data of 1600 pixels ⁇ 1200 pixels, and consider a portion having a size of 8 pixels ⁇ 8 pixels as the partial data.
- the interleave compression unit 6 is configured to add a function for determining the data size of the produced compressed partial data, and to add a value of the determined data size to the IE compressed partial data to be output and to output.
- a function is added to accumulate the data size value added to the compressed partial data each time the compressed partial data is input to the memory controller 8.
- the addition is performed for each compression parameter value used for compressing the compressed partial data.
- the accumulated value is stored in the RAM 9 at an appropriate location.
- the CPU 22 reads the integration data stored in that location on the RAM 9.
- the compression parameter that realizes the optimal data size, and it is possible to reduce the processing amount of the CPU 22.
- all the functions of the data file configuration unit 10 can be realized by software. That is, when the compressed partial data output from the interleave compression unit 6 is stored in the RAM 9, the data is not sorted according to the compression parameter values used for compression, and is sequentially input to the data file configuration unit 10. It may be stored in RAM 9. In this case, CPU22 and ROM21
- FIG. 6 is a diagram schematically showing a hardware configuration of the image data compression device.
- the image data compression device 26 includes a partial data acquisition unit 28, an interleave compression unit 30, a RAM 9, and a data file configuration unit 60, similarly to the image data compression device 2 described above.
- the partial data acquisition unit 28 of the present embodiment has a buffer memory 31 and a data acquisition unit control unit 32, like the partial data acquisition unit 4 in the image data compression device 2 of FIG. These functions are the same as those in the partial data acquisition unit 4 in the image data compression device 2 in FIG. 1, but differ in that two functions are added.
- One is a function that, when the data acquisition unit control unit 32 captures partial data from the image data 34 to be compressed, simultaneously performs the thinning process specified in the JPEG system.
- the data acquisition unit control unit 32 is configured so that, of the image data 34 to be compressed, the data that is discarded without performing the JPEG encoding process is not taken into the buffer memory 31 from the beginning. .
- the other is to perform DCT (Discrete Cosine Transform) before storing the acquired partial data in the buffer memory 31.
- the partial data acquisition unit 28 includes a DCT circuit 3 &.
- the interleave compression section 30 of the present embodiment has a data compression circuit 38 and a data compression control section 40, like the interleave compression section 6 in the image data compression apparatus 2 of FIG. These functions are performed by the interleave compression unit in the image data compression device 2 in Fig. 1. 6 is the same as that of the sixth embodiment, except that the interleave compression section 30 in the present embodiment is optimized to use the JPEG method as the compression method and has a stiff structure.
- the data compression circuit 38 includes a 'Q table storage unit 42, a Q factor storage unit 44, a multiplier 46, a divider 48, a zigzag conversion unit 50, an event peak coding unit 51, and an RS insertion unit 52.
- the Q factor and the Q taper are compression parameters defined by the JPEG method, and changing this value changes the data size after compression.
- a plurality of Q factor values are stored in the Q factor storage unit 44, and the value of the Q factor used for quantization can be switched under the control of the data compression control unit 40.
- a plurality of Q tables are provided in the Q table storage unit 42 and the plurality of Q tables can be switched.
- the Q factor is a coefficient, but the Q tape is a matrix. Therefore, the description of “compression parameter value” in the description so far does not exclude that it is a matrix.
- the RS Ti input section 52 differs from the RST input section 52 of the conventional JPEG compressor in that the same RST marker is added to all partial data compressed with the same Q factor and compressed with different Q factors.
- a different RST marker is attached to the specified partial data. That is, an RST marker is inserted as an identification marker for identifying the compression parameter value used for the compression, that is, the value of the Q factor.
- RST 1 is added to all compressed partial data with a Q factor of 1
- RST 2 is added to all compressed partial data with a Q factor of 2.
- the data file configuration unit 60 of the present embodiment includes a memory controller 53, a ROM 54, a RAM 55, and a CPU 56, like the data file 'configuration unit 10 in the image data compression device 2 in FIG. You.
- the data file configuration unit 60 in the present embodiment is the final output of the image data compression device 26.
- the configuration is different.
- the RAM 55 stores the compressed partial data output from the interleave compression unit 30.
- the compressed compressed data is stored in the same area in the RAM 9.
- the ROM 54 stores a program for operating the CPU 56 as an information processing device.
- the data stored in the RAM 55 is examined, and the total data size of all the compressed partial data compressed with the same Q factor is obtained for each Q factor value.
- CP XJ 56 selects a compressed partial data using a Q factor value which is equal to or less than a predetermined threshold value and is a value closest to the threshold value.
- the compressed image data file that is the final output of the image data compression device 26 is configured to be in the format specified by the JPEG standard according to the system.
- the program stored in OM54 removes the RST marker attached as a marker that identifies the Q factor value used for compression from the selected compressed partial data, and follows the rules specified in the JPEG standard again.
- compressed image data Huai Le of CPU 5 6 is constructed in accordance with a program stored in the R OM 54 by conventional J PEG compressor, the entire image data 3 4 J It is equivalent to a compressed image data file created by PEG compression, and can be handled as image data on a personal computer or the like.
- the image data compression device 26 includes an image data compression unit 58 in charge of compression processing, and a data file # for producing a final output compressed image data file from the interleaved compressed partial data.
- the feature is that it is separated into 60.
- the present invention can be implemented in such an embodiment.
- This embodiment is convenient when the image data compression apparatus according to the present invention is incorporated in an electronic device with a built-in camera in which the camera unit and other parts are manufactured separately.
- the camera module incorporates an image data compression unit 58
- the telephone module incorporates a data file configuration unit 60.
- Embodiments are possible.
- the image data compression section 58 has a data output section 61 for outputting compressed partial data
- the data file construction section 60 has a data input section 62 for inputting the compressed partial data.
- the data output section 61 is simply an interleave compression section.
- Data input section 6 2 solves the shaping of the compressed partial data shaped by the data output unit 61 transfers the compressed partial data solved shaping to the memory controller 5 3.
- step S21 is the start of processing.
- the data acquisition control unit 32 extracts a portion of the image data 34 to be compressed having a predetermined size from the storage unit in which the image data is stored. However, if the part should be discarded (thinned out) according to the setting of JPEG, the next necessary part is taken out without taking out the part.
- the extracted partial data is converted into frequency domain data by the DCT circuit 36 (step S23) and stored in the buffer memory 31 (step S24).
- step S25 the data compression control unit 40 and the Q factor storage unit
- Step S 26 the data The data compression control unit 40 reads the Q table from the Q table storage unit 42 and 1 to.
- step S27 the multiplier 46 multiplies the Q tape read in step S26 by the Q factor selected / read in step S25.
- step S28 the data compression control unit 40 reads out the partial data stored in the buffer memory 31.
- step S29 the divider 48 divides the partial data read in step S28 into the Q table multiplied by the Q factor in step S27. Step S28 is quantization referred to in the JPEG system.
- step S30 zigzag conversion is performed on the one-minute data quantized in the zigzag conversion unit 50, and in step S31, the partial data subjected to zigzag conversion in the entropy coding unit 51 is processed.
- Entropy coding is performed.
- step S32 the RST insertion unit 52 adds an RST marker to the partial data after entropy coding.
- step S32 unlike the RST marker assignment in the conventional JPEG compressor, the same RST marker is assigned to all partial data compressed using the same Q-factor value, and different Q-factor values are assigned.
- a different RST marker is assigned to the partial data compressed using That is, in the present embodiment, the RST marker is used as an identification marker for identifying the value of the Q factor used for compression.
- step S32 the compressed partial data is completed.
- step S33 the data output unit shapes the compressed partial data according to the specifications of the interface between the data output unit 61 and the data input unit 62, and converts the shaped compressed partial data into a data file configuration unit 60 Output to
- step S34 the data compression control unit 40 determines whether or not step S33 from step S25 is repeated a predetermined number of times. If not, return to step f 25.
- the data compression control unit 2 Select a different Q factor from the factor store.
- the interleave compression unit 30 uses a plurality of compressed partial data compressed by using different Q factors from the same partial data. Are generated one after another, and these compressed partial data are sequentially output from the data output unit 61.
- steps S25 to S33 are repeated by the number of Q factors to be used, it is determined in step S35 whether all necessary portions of the image data 34 to be compressed have been extracted.
- step S22 the data acquisition control unit 32 discards the partial data stored in the buffer memory 31 and sets a different The part of the data is extracted and stored in the buffer memory 31.
- Steps S25 to S33 are repeated by the number of Q factor values to be used for the partial data newly stored in the buffer memory 31, and the partial data is compressed using different Q factor directs. A plurality of compressed partial data are created.
- step S34 and step S35 the data output from the data output unit 61 is obtained by combining data compressed with a certain Q factor value with data compressed with another Q factor value. The result is an interleaved output. This situation is similar to that shown in FIG.
- the compression processing ends (step S36).
- Step S41 is the opening of the process.
- step S42 the compressed partial data output from the data output unit 61 is sequentially input to the data input unit 62.
- the compressed partial data is subjected to shaping adapted to the specifications of the interface.
- step S43 the memory controller 53 specifies the storage destination address in the R Akl 55 of the compressed partial data.
- the memory controller 53 is the same The storage destination addresses of the compressed partial data are allocated so that the compressed partial data compressed with the Q fat value is stored together in the same area in the RAM 55.
- step S44 the compressed partial data is stored in the RAM 55 one after another. When the storage of all the compressed partial data sent from the image data compression unit 58 is completed, the memory controller 53 notifies the CPU 56 of the storage completion.
- step S45 the CPU 56 checks the compressed partial data stored in the RAM 55 according to the program stored in the ROM 54, and checks all compressed data with the same Q factor value. Calculate the total data size of the compressed partial data for all Q factor values used for compression. Then in step S46, ⁇ ? In accordance with the program stored in 13 ⁇ 4 ⁇ M 54, the compression is performed by using the Q factor value in which the total data size of the compressed partial data is equal to or smaller than a predetermined threshold value and is the closest to the threshold value. Select partial data. If the sum of the data sizes of the compressed 3 ⁇ 45 minute data exceeds the threshold for all the used Q factor values, select the compressed partial data using the Q factor value with the smallest sum.
- step S47 the CPU 56 according to the program stored in the ROM 54, except for the RST marker added as a marker for distinguishing the Q factor value used for compression from the selected EE compressed partial data,
- the RST marker is added again according to the provisions of the JPEG standard, and the final output JPEG format compressed image data file is constructed.
- the processing of the data file composing section 60 is completed (step S48), but the produced compressed image data file is externally output for storage or the like, and stored in an appropriate external storage device 63. You.
- FIG. 9 is an external view of a camera-equipped mobile phone to which the present invention is applied.
- the mobile phone 64 has alphanumeric keys 66 on the front side for entering phone numbers and text of e-mails, function keys 68 for operating various functions of mobile phones with built-in cameras, and calls.
- On-hook key 70 for terminating the call
- off-hook key 72 for answering and sending calls
- display 74 etc.Equipped with a camera module 76, battery compartment cover 77 on the back side .
- the camera module 76 includes a lens 78 and a strobe 80.
- an antenna section 82 is provided on the upper surface, and a housing 84 for integrally holding these is provided.
- the mobile phone 64 with a built-in camera can have not only a telephone function and a camera function but also various functions such as a telephone directory, a calculator, a schedule book, a game, and the like.
- the alphanumeric keys 66, the function keys 68, the on-hook keys 70, and the off-hook keys 72 are each assigned a plurality of roles.
- FIG. 10 is a diagram schematically showing a hardware configuration of a camera-equipped mobile phone 64 according to the present invention.
- the camera-equipped mobile phone 64 is composed of a camera module 76 that captures images to create image data, and a host module 86 that has the function of storing the image data and also has a telephone function and a PDA function. Be composed.
- the camera module 76 includes a lens 78, an imaging device 88 that converts light incident through the lens 78 into an electric signal, an AD converter 90 that converts an output signal of the imaging device 88 into a digital signal, Image data construction unit 92 that constructs image data by color capture processing from output signals of digitized image sensor 8 8, Memory 9 that temporarily stores image data constructed by image data construction unit 9 2 Has 4 etc.
- the output signal of the image sensor 88 is processed by the image data construction unit 92 to become image data that can be displayed on a personal computer or printed on a printer for the first time.
- the image data construction unit 92 can be configured to construct a predetermined number of lines, for example, 16 lines, instead of constructing one frame of image data at a time.
- the constructed image data portion is stored in the memory 94 one after another.
- the camera module 76 further includes an image data compression unit 96.
- the image data compression unit 96 is the same as the image data compression unit 58 of the compressed image data file creation device according to the present invention described in the first embodiment, and uses the interleave compression using the JPEG method described in FIG.
- the image data compression unit 96 differs from the image data compression unit 58 in the first embodiment in that it is controlled by a camera control unit 98 described later as a whole.
- the image data compression unit 96 includes a partial data acquisition unit 100, an interleave compression unit 102, and a data output unit 104, like the image data compression unit 58. These are the same as the partial data acquisition unit 28, the interleave compression unit 30, and the data output unit 61 of the compressed image data file production device 26 described in the first embodiment, respectively.
- the camera module 76 further includes a camera control unit 98 that controls the functions of the camera module 76.
- the camera control unit 98 includes a CPU and software for operating the CPU, and receives an instruction from the host module 86 to receive an image pickup device 88, an AZD converter 90, and an image data construction unit 92.
- the image data compression section 96 is controlled.
- the interleaved compressed image data is transmitted to the host module 86 through the camera-side data IZF 106, and the control information between the camera module 76 and the host module 86 is transmitted to the camera-side control I / F 1 Exchanged through 08.
- the image data construction unit 92 and the image data compression unit 96 are preferably configured as hardware circuits. Further, it is preferable that these hardware circuits and the camera control unit 98 are integrated and configured as a single-chip LSI as the imaging control device 110.
- the host module 86 has an application processing unit 112, a baseband processing unit 114, which controls telephone functions, an antenna unit 82, a main storage device 116, such as a DRAM, an SD card ⁇ an MMC card, etc.
- the external storage device 118 which is a storage device suitable for long-term storage of data, the keypad 120 including the keys 66, 68, 70, and 72 in FIG. Equipped with sprays 7 4.
- the application processing unit 112 receives the data transmitted from the processor 122, the ROM 124 that stores the program for operating the processor 122, the memory controller 125, and the camera module 76.
- the main storage device 1 16 is connected to the processor 122 and the memory controller 125 via a bus 129, and the external storage device 118, the keypad 120, and the display 74 are connected to the bus 130.
- Through the processor is connected to 122.
- the program stored in the ROM 124 realizes the same function as the data file configuration unit 60 of the image data compression device 26 described in the first embodiment in cooperation with the processor 122, Phonebook 'Calculator' Schedule Book ⁇ Realize games and other various functions.
- the camera module 76 is directly controlled by the camera module control section 98.
- the camera module control section 98 executes control of the camera module 76 according to an instruction of the application processing section 112. For example, when a shooting button in the keypad 120 is pressed, the application processing unit 112 senses the pressing and controls the camera control unit 98 to give a command to “take a picture” on the host side. I / F 1 28, camera side control Transmit through IZF 108. Then, the camera control unit 98 interprets the command, and directly controls the image sensor 88, the A / D converter 90, the image data construction unit 92, and the image data compression unit 96 to capture the image. And image data construction, and image data compression.
- step S51 is the start of shooting.
- step S52 the image sensor 88 is exposed.
- step S53 the electric signal output from the image sensor Is converted into a digital signal format signal.
- step S54 the image data constructing unit 92 constructs image data that can be handled by the VASCON printer from the digitized output signal of the image sensor 88. .
- the constructed image data is stored in the memory 94 (step S55).
- step S56 the partial data acquisition unit 100 extracts partial data of a predetermined size from the memory 94, performs DCT processing, and stores the data therein. This processing is the same as that described in steps S22 to S24 in FIG.
- step S57 the interleave compression unit 102 compresses the partial data stored in the partial data acquisition unit 100 by using different Q factor values. To create compressed partial data. This processing is the same as that described in steps S25 to S32 in FIG.
- step S58 the compressed partial data generated by the interleave compression unit 102 is shaped according to the specifications of the data I / F, and is sequentially output from the data output unit 104.
- step S59 it is determined whether or not all necessary parts of the image data 34 to be compressed have been compressed. If No, the process returns to step S56, and if Yes, the process ends. (Step S60).
- step S54 the image data construction unit 92 does not construct one frame of image data at a time, but constructs a predetermined number of lines, for example, 16 lines.
- the constructed image data is stored in the memory 94, but before the constructed image data is stored in the memory 94, the image data stored in the memory 94 is stored.
- the photographing control device 110 can be configured so as to perform all the interleave compression. With this configuration, it is sufficient for the memory 94 to have a capacity of, for example, 16 lines, which leads to a reduction in camera module space and manufacturing cost. ⁇
- Step S61 is the start of the process.
- the compressed partial data is sequentially input to the camera module 76 through the camera-side data I / F 106 and the host-side data I / F 126. These compressed partial data are de-shaped in the data input unit 62 according to the specifications of the interface.
- the memory controller 125 specifies the storage destination address of the compressed partial data in the main storage device 116. At this time, the memory controller 125 assigns the storage destination address of the compressed partial data so that the compressed partial data compressed with the same Q factor value is collectively stored in the same area in the main storage device 116.
- the compressed partial data is sequentially stored in the main storage device 116. When the storage of all the compressed partial data sent from the image data compression unit 58 is completed, the memory controller 125 notifies the processor 122 of the completion of the storage.
- step S65 the processor 1 22 checks the compressed partial data stored in the main storage 1 16 according to the program stored in the ROM 1 24, and checks all data compressed with the same Q-fat value. Calculate the total data size of the compressed partial data for all Q factor values used for compression.
- step S66 the port processor 122 sets the total data size of the compressed partial data to a value equal to or less than a predetermined threshold value and closest to the threshold value according to the program stored in the ROM 122. Select the compressed partial data that has been compressed using the Q factor. If you use all Q factor values! / If the sum of the data sizes of the compressed partial data exceeds the threshold value, the compressed partial data that has been compressed is selected using the Q fatter value that minimizes the total.
- step S67 the processor 122 selects the Q factor used for compression from the selected compressed partial data according to the program stored in the ROM 124. Except for the RST marker added as a marker for distinguishing values, re-attach the RST marker according to the rules stipulated in the JPEG standard and construct a final output JPEG format compressed image data file I do.
- step S69 the created JPEG format compressed image data file is stored in the external storage device 118. This ends the processing (step S69).
- the camera-equipped mobile phone 64 previews the image data constructed by photographing on the display 74.
- the following configuration can be adopted.
- all the output signals of the imaging device 88 which have been subjected to AZD conversion are temporarily stored in appropriate storage means.
- the image data construction section 92 reads out the stored output signal from the storage means and resizes the output signal to construct preview image data.
- the output signal of the image sensor 88 is read again from the storage means to construct image data for storage, and then interleave compression is performed. Since the preview image data has a low resolution (for example, 240 pixels ⁇ 120 pixels), the image data for preview need not be compressed by the image data compression unit 96.
- the preview image data is transmitted to the host module 86 prior to all the compressed partial data.
- the image data compression section 96 has a function of creating preview image data.
- the image data compression unit 96 first creates preview image partial data whose resolution is simply reduced with respect to the partial data stored in the partial data acquisition unit 100, and outputs the data from the data output unit. It is configured to output the data and then to compress the partial data. That is, in this configuration, the preview image partial data and the plurality of compressed partial data, which are respectively created from the same partial data, are sequentially output from the camera module 76.
- the partial data for the preview image is created for all the partial data stored in the partial data acquisition unit 100. It is not necessary to manufacture them, it is sufficient to perform only a part of them.
- the processor 122 based on the program stored in the ROM 124, converts the preview image partial data stored separately in the main storage device 116 into the display 7 4 Must have the function of composing the preview image data to be displayed on the screen.
- the compression method used in the present invention is not limited to JPE 3G.Even when JPEG is used, the embodiment using a Huffman table as a compression parameter to be changed in interleave compression,
- a marker other than RST is used as a marker indicating the compression parameter value.
- the JPEG standard defines markers that can be applied as the above markers.
- the embodiments of the present invention are not limited to hardware, and the present invention can be implemented as computer software incorporating a method for creating a compressed image data file according to the present invention.
- the present invention is not limited to such electronic devices, and can be applied to electronic devices such as mobile phones with built-in cameras and PDAs and portable computers. It is also possible to apply to 0 2 etc. In any case, various embodiments are possible without departing from the spirit of the present invention.
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Abstract
Description
Claims
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JP2006512203A JP4406640B2 (ja) | 2004-04-09 | 2004-04-09 | 圧縮画像データファイルの作成方法、画像データ圧縮装置及び撮影装置 |
CNA2004800431187A CN1954611A (zh) | 2004-04-09 | 2004-04-09 | 压缩图像数据文件的生成方法,图像数据压缩装置及摄影装置 |
PCT/JP2004/005108 WO2005101849A1 (ja) | 2004-04-09 | 2004-04-09 | 圧縮画像データファイルの作成方法、画像データ圧縮装置及び撮影装置 |
EP04726795A EP1737238A4 (en) | 2004-04-09 | 2004-04-09 | PRODUCTION METHOD FOR COMPRESSED IMAGE FILES, IMAGE COMPRESSION DEVICE AND PICTURE DEVICE |
US11/545,011 US7477796B2 (en) | 2004-04-09 | 2006-10-06 | Method for preparing compressed image data file, image data compression device, and photographic device |
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KR102416160B1 (ko) * | 2019-12-20 | 2022-07-05 | 라인플러스 주식회사 | 영상 저장 서비스 제공 방법, 컴퓨터 프로그램 및 컴퓨팅 장치 |
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Also Published As
Publication number | Publication date |
---|---|
CN1954611A (zh) | 2007-04-25 |
US20070098284A1 (en) | 2007-05-03 |
EP1737238A1 (en) | 2006-12-27 |
US7477796B2 (en) | 2009-01-13 |
EP1737238A4 (en) | 2010-12-15 |
JP4406640B2 (ja) | 2010-02-03 |
JPWO2005101849A1 (ja) | 2008-03-06 |
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