JP4125080B2 - Image processing apparatus, image processing method, and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image processing apparatus and an image processing method for outputting image data of electronic information captured by a digital still camera or a video camera to an output device such as a printer via a recording medium.
[0002]
[Prior art]
Conventionally, heat-sensitive paper has been used as printing paper, and a plurality of heating elements arranged in the main scanning direction are selectively driven to convey the paper in the sub-scanning direction, thereby printing dots on the paper. There is a line thermal transfer printer.
[0003]
In recent years, with the progress of input devices that handle images such as digital cameras, digital video cameras, and scanners on the input side, thermal transfer type printer devices have attracted attention as printing means.
[0004]
Because the inkjet printer has only two choices of whether or not to drop the droplets, let the small droplets land on the paper and get an apparent resolution and gradation by methods such as error diffusion On the other hand, in the case of a thermal transfer printer, the controllable heat value can be easily changed in one pixel, so that a large gradation can be obtained for one pixel. As a result, it is possible to obtain a smoother and higher quality image as compared with the ink jet printer. In addition, the performance of the thermal head and the performance of paper materials have also improved, making it possible to obtain image prints that are as good as silver halide photographs with a finished quality, especially in order to keep pace with the recent progress of digital cameras. It is attracting attention as a printer for natural images.
[0005]
Therefore, such a printer device and a photographing device such as a digital camera or a digital video camera are directly connected to each other or are integrally configured, and the photographed image information is passed through a device such as a computer for processing the image information. There is also a system for printing.
[0006]
A printing system in which a digital camera and a printer device are directly connected will be specifically described. An image taken with a digital camera is temporarily stored in a recording medium included in the digital camera. In order to print out the image from the printer device, the user directly connects the digital camera and the printer device with a dedicated cable. Next, the image stored in the recording medium is displayed on the display device of the digital camera, and the image to be printed is selected. Needless to say, the operation member of the digital camera is used to select an image at this time. When the image to be printed can be selected, the print instruction key assigned to the operation member of the digital camera is pressed. By doing so, image processing for printing is executed in the digital camera. When the image processing in the digital camera is completed, the print data is transferred to the printer device, and the printer device prints out the received data.
[0007]
In the above description, the user can easily perform a photographic printout by simply operating the operation member of the digital camera several times for printing out, which is very convenient.
[0008]
In addition, the digital camera has a JPG chip for compressing captured image data into a JPG file or decompressing the JPG file to restore the image data due to the nature of the device. In general, it has an IC chip having a resizing function for making data a desired size. Effective use of the hardware resources of this digital camera for creating print data not only greatly increases the processing time compared to the case where JPG decompression and resizing functions are realized by software processing, but also as a total printing system. The required resources can be configured at the minimum, leading to cost reduction.
[0009]
On the other hand, the realization of print data image processing within the digital camera as in the configuration of the print system described above has the advantage that the hardware blocks suitable for image processing for print data creation can be used effectively. There is also a disadvantage of being limited by another hard block in the digital camera. Specifically, image processing for creating print data must be performed in the limited work memory of the digital camera, and when the print data size increases, the work memory of the digital camera may be insufficient. . Conventionally, in order to solve this problem, when writing to the work memory for each block (primary resizing, secondary resizing) of image processing of print data, the size of all the print data (credit card size) supported by the device , L size, A6 size, etc.), the resizing rate and the image format (YUV format) are set in advance to solve the shortage of work memory during image processing of print data.
[0010]
[Problems to be solved by the invention]
However, the fact that the image format after image conversion (YUV format) is uniquely determined by the print data size (credit card size, L size, A6 size, etc.) as in the configuration of the printing system described above depends on the input image size. However, even if there is a sufficient work memory for image processing, the image data is thinned out, so that there is a problem that the print image is excessively deteriorated.
[0011]
[Means for Solving the Problems]
In order to solve such a problem, the present invention includes a capturing unit that captures compressed image data from a storage medium in which image data is recorded, a decompressing unit that decompresses compressed image data captured by the capturing unit, and a decompressing unit. An internal memory for storing the decompressed image data; and output means for converting the image data stored in the internal memory into print image data and outputting the print image data. The decompression means before decompressing the compressed image data The format of the luminance color difference signal is selected based on the size of the image data after decompressing the compressed image data and the free space in the internal memory.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
FIG. 1 shows a configuration diagram of a first embodiment of the present invention. In the first embodiment, an image photographed by the digital camera 1 and an image stored in the memory medium after photographing and read out again are processed into print data of the sublimation printer in the digital camera, and then yellow via two dedicated cables. In this example, the data is sent to a sublimation printer 3 in the order of magenta and cyan, and the data is color-printed.
[0013]
The user can select a print pattern, an image to be printed, a print designation frame, and the like with the operation member 4 of the digital camera shown in FIG. 1 and confirm the contents on the liquid crystal screen 5 of the digital camera.
[0014]
FIG. 2 is a schematic diagram for explaining the basic principle of the sublimation thermal transfer system of the image recording system used in the present invention. The sublimation type thermal transfer method is a method using a diffusion phenomenon of a dye (pigment).
In the figure, reference numeral 11 denotes an ink sheet in which dyes of three colors (yellow, magenta, and cyan) are applied to a plastic sheet. The ink sheet 11 is superimposed on the dedicated photographic paper 12 and sandwiched between the thermal head 13 and the platen roller 14, and the ink sheet is sublimated / thermally diffused onto the dedicated photographic paper 12 by the heat of the thermal head 13. Get a color print.
[0015]
In addition, in order to ensure the color development of the sublimation dye 15, a receiving layer 16 mainly composed of a polyester resin is applied to the dedicated photographic paper 12. At this time, gradation can be given by controlling the amount of heat given to the thermal head 13. By giving gradation to each of the three colors (yellow, magenta, and cyan) and printing them on the same part of the photographic paper, high-definition full-color printing in units of one pixel can be realized.
[0016]
Next, FIG. 3 shows a block diagram of a digital camera that performs an image processing portion for creating print data in this embodiment. In the figure, 20 is a CCD for converting an image formed through a lens into an electric signal, 21 is a CPU that controls the digital camera system, and is responsible for arithmetic processing, and 22 is an image that processes an electric signal sent from the CCD. A processing engine, 23 is a flash ROM for storing a program for controlling the digital camera system, 24 is an SDRAM for temporarily storing image data or used for data processing work, and 25 is an image. A CF (Compact Flash (R) memory) for storing data files, 26 a CF connector for mounting the CF on the digital camera, 27 an image taken with the digital camera, An LCD 28 for displaying a menu for operating the camera is an LCD driver for driving the LCD. Iber.
[0017]
In this embodiment, three print patterns can be selected as shown in FIG.
[0018]
First, there is no border (FIG. 4-1). This pattern prints an image on the entire surface of the recording paper. The second has a border (FIG. 4-2). This pattern is printed so that the entire image fits on the recording paper. The third is multi (FIG. 4-3). In this pattern, eight identical images are printed (in the case of card size).
[0019]
Furthermore, in this embodiment, it is possible to select three types of printing paper as shown in FIG. In the figure, (1) is the card size and the vertical and horizontal size is 1040x662 pixels. Since sublimation printers can express 256 levels of gradation with one pixel, a data amount of 1040x662x256 (bit) = 1040x662 (Byte) = 688.480 (Kbyte) is required for printing in each of yellow, magenta, and cyan. . (2) is an L size and the vertical and horizontal sizes are 1456 x 1100 pixels. The amount of data is yellow, magenta and cyan.
1456x1100x256 (bit) = 1456x1100 (Byte) = 1601.600 (Kbyte).
(3) is A6 size and the vertical and horizontal size is 1808x1232 pixels. The amount of data is yellow, magenta and cyan.
1808x1232x256 (bit) = 1808x1232 (Byte) = 2227.456 (Kbyte).
[0020]
The amount of data on each printing paper is as follows. If the card size in (1) is 1.000, the L size in (2) is 2.326 times that of A, and the A6 size in (3) is 3.235 times. It can be seen that the work memory required for processing increases.
[0021]
FIG. 6 shows a print image data creation procedure of this embodiment. First, (2) the JPG file stored in the CF (compact flash (R) memory) is read into the work memory of the digital camera.
[0022]
Next, (3) the JPG file on the work memory is sent to the JPG chip and decompressed, and then the primary resizing is performed. At this time, the image data after the primary resizing in the YUV format is written on the work memory. Furthermore, (4) a low pass filter is applied if necessary from the relationship between the input image size and the print image size. (5) The image data after the primary resizing or after the low pass filter is read and subjected to the secondary resizing to obtain the desired YUV format data, and the result is written in the work memory, and the image data is sharpened. Finally, {circle over (6)} yellow (Y), magenta (M), and cyan (C) print image data are created from the YUV format image data.
[0023]
The use of the work memory during the print image data creation procedure described above will be specifically described with reference to FIG.
[0024]
In the figure, dark shaded portions above and below each memory map are areas used by the system. First, the JPG file read from the CF (compact flash (R) memory) is expanded in the JPEG reading area 71 of FIG. Next, the JPG file developed on the JPEG reading area 71 is read into the image conversion block 1 and decompressed, and then primary resizing is executed. As an area for developing the resultant data, an area 72 shown in FIG. At this time, in consideration of the certainty of the expansion process, the area 71 where the JPG file is expanded should not be overwritten. Next, when the input image is very large and it is expected that the data reduction is obviously large compared to the amount of data to be output, a low pass filter is applied. For example, if the print size is relatively small, the print data to be output may be small, but this print data is expected to be, for example, ½ or less than the image data after being expanded and subjected to the primary resizing. In some cases, a low-pass filter is applied.
[0025]
When it is necessary to apply a low-pass filter, the work memory is used as much as shown in FIG. Further, the data after applying the low-pass filter is developed in a region 74 at the same position (address) as the data after the primary resizing. Therefore, the position (address) of data when the data is transferred to the image conversion block 2 (secondary resizing) is the same regardless of whether or not the low-pass filter is applied. The developed area after the secondary resizing is shown in an area 75 in FIG. Yellow (Y), magenta (M), and cyan (C), which are print data, are created from the YUV data after the secondary resizing, and are created in the Y / M / C data area 76 shown in FIG. expand. Finally, the peripheral portion of the Y / M / C data is copied to the Y '/ M' / C 'data area 77 in FIG. The data is complete.
[0026]
It should be noted that in the above-described print data processing, the data in the intermediate stage must have a data size that can be processed in the work memory at each time point.
[0027]
At the same time, in order to improve the print image quality as much as possible, it is desirable to secure as much data as possible to be processed as print data.
[0028]
Therefore, in this embodiment, the YUV format and the resizing rate of the image data after the primary resizing are determined so as not to exceed the size of the work memory 72 for expanding the image after the primary resizing, so that the data is written to the work memory. It is possible to adjust the data capacity, avoid duplication of work memory areas required during print image data processing, and eliminate print image deterioration.
[0029]
The YUV format referred to here is a ratio in which luminance data (Y) and color difference data (U, V) are included when representing image data. YUV4: 4: 4, YUV4: 2: 2, YUV4: 1: 1, etc. are common formats. YUV4: 4: 4 is the case where the ratio of the luminance data and the U and V color difference data is equal. YUV4: 2: 2 is a data format in which U and V color difference data is 2 with respect to luminance data 4, and YUV4: 1: 1 is data in which U and V color difference data is 1 with respect to luminance data 4. Format. FIG. 8 shows the difference in data amount between YUV4: 2: 2 and YUV4: 1: 1.
[0030]
In the case of YUV4: 2: 2, 4 words of data are required to express 4 pixels of data, and in the case of YUV4: 1: 1, 3 words of data are required to express 4 pixels of data. is there. Therefore, it can be seen that YUV4: 1: 1 requires 3/4 of the data amount compared to YUV4: 2: 2. It can be seen that it is advantageous to use YUV 4: 1: 1 when the amount of data in the work memory is insufficient.
[0031]
Further, from the data packing form of YUV4: 2: 2 and YUV4: 1: 1 in FIG. 8, in the case of YUV4: 2: 2, data can be handled in units of 2 pixels, but YUV4: 1: 1. In this case, it can be seen that data can be handled only in units of 4 pixels. This means that when resizing, etc., YUV4: 2: 2 can handle a data size that is a multiple of 2, but YUV4: 1: 1 can only handle a data size that is a multiple of 4. However, YUV 4: 2: 2 is more advantageous from the viewpoint of degree of freedom in size. Further, from the viewpoint of the amount of information of the image data, when expressing the same image, YUV 4: 2: 2 can be expressed more faithfully and image degradation can be considered to be less than YUV 4: 1: 1.
[0032]
In consideration of the above, how to determine the resizing ratio and YUV format at the time of primary resizing in the present embodiment will be specifically described with reference to FIGS.
[0033]
The way of thinking is different depending on whether a low pass filter is applied or not.
[0034]
When the low pass filter is not applied. The flowchart is shown in FIG. First, the denominator of the primary resizing rate, the numerator, and the YUV format of the rewritten writing data are set as initial values (S1). The denominator and numerator of the primary resizing ratio are set to 8. With this value, the data after JPG decompression is expanded on the work memory without being resized. The YUV format of the write data is set to 4: 2: 2. Next, it is determined whether or not the data amount after JPG decompression and primary resizing fits in the work memory capacity secured in advance (S2). If yes, go to the left branch, if no, go to the right branch. When the process proceeds to the left branch at Yes, the resize target size as the image size after the secondary resizing is compared with the value obtained by multiplying the input image size by (B-2) / A (S3). If the resize target size is smaller, the value of the primary resize rate is set to B-2 (= 6) (S4). In this case, the primary resizing rate is set to 8/8 and the resizing is not performed, and the resizing to the target size is performed once. This is because the image size after resizing is generally better when the image is resized to the target size.
[0035]
However, if the result of reduction by primary resizing becomes smaller than the resize target size, the image data is discarded more than necessary, so the numerator of the primary resizing rate is left at the initial value ( S5). If NO has never been determined in S2, the YUV format remains the initial value regardless of whether the process proceeds to S4 or S5. In this example, it is 4: 2: 2.
[0036]
If the condition determination in S2 is No, the process proceeds to S6. Since the YUV format is 4: 2: 2 at the beginning, the process proceeds to S7, where the YUV format is set to 4: 1: 1. Thereafter, the condition determination of S2 is performed again. If the result of S2 is Yes at this stage, the process proceeds to S3 and the above operation is performed. If the answer is No, the process proceeds to S6. Since the YUV format is 4: 1: 1 this time, it is reset to 4: 2: 2 in S8, and 2 is subtracted from the initial value of the molecule in S9. The primary resizing ratio at this time is denominator = 8, numerator = 6, YUV format 4: 2: 2. The above operations are repeated to determine the primary resizing rate and the YUV format at the time of writing after the primary resizing.
[0037]
That is, the primary resizing rate and the YUV format after the primary resizing are as follows.
1. The YUV format is 4: 2: 2 and the primary resizing is the same size and the resized data fits in the work memory. If the input image is 6/8 times larger than the resizing target size, the primary resizing is performed. The ratio is 6/8 and the YUV format is 4: 2: 2.
2. The YUV format is 4: 2: 2 and the primary resizing is the same size and the resized data is stored in the work memory. If the input image is 6/8 times smaller than the resize target size, the primary resizing ratio is 8 / 8, YUV format 4: 2: 2.
3. If the YUV format is 4: 2: 2 and the primary resizing is the same size, and the data after resizing does not fit in the work memory, the YUV format is set to 4: 1: 1 to perform the primary resizing in the work memory. If the later data is stored and the input image is 6/8 times larger than the resize target size, the primary resize ratio is 6/8 and the YUV format is 4: 1: 1.
4). If the YUV format is 4: 2: 2 and the primary resizing is the same size, and the data after resizing does not fit in the work memory, the YUV format is set to 4: 1: 1 to perform the primary resizing in the work memory. When the subsequent data is stored and the input image is 6/8 times smaller than the resize target size, the primary resize ratio is 8/8 and the YUV format is 4: 1: 1.
5. If the data after the primary resizing does not fit in the work memory even if the primary resizing is 4: 1: 1 with the YUV format set to 4: 1, the work memory is set to the YUV format 4: 2: 2 and the molecule 6 If it seems that the data after the primary resizing fits within it,
The primary resizing ratio is 6/8 and the YUV format is 4: 2: 2.
[0038]
Note that only five cases are listed here because, as will be described later, a low-pass filter is applied when the primary resizing ratio is expected to be 4/8. This is because it is assumed that this flow does not become 4/8.
[0039]
Next, when applying a low-pass filter, the flowchart is shown in FIG.
In this case, it is assumed that the image data after development is obviously large, and the resizing rate in the primary resizing is smaller than 4/8 (that is, 1/2).
[0040]
Note that this flow may be automatically applied when a print size smaller than a predetermined print size is selected.
[0041]
First, in S11, the denominator of the primary resizing rate, the numerator, and the YUV format of the rewritten writing data are set as initial values. The denominator and numerator of the primary resizing ratio are set to 8. With this value, the data after JPG decompression is expanded on the work memory without being resized. The YUV format of the write data is set to 4: 2: 2. Next, in S12, it is determined whether the data amount after JPG decompression / primary resizing fits in the work memory capacity reserved in advance. If yes, go to the left branch (S13), if no, go to the right branch (S15). If the process proceeds to the left branch (S13) with Yes, it is determined whether there is sufficient work memory when the low-pass filter is applied. If the determination is Yes, the process proceeds to the left branch. In S14, the numerator of the primary resizing rate is set to 8 with the initial value, and at this time, the YUV format of the write data after the primary resizing rate and the resizing is determined with the initial value. It will be. Since the low-pass filter is less effective unless it is applied before resizing the image, the primary resizing rate is set to be as large as possible.
[0042]
If any of the condition determinations in S12 and S13 is No, the process proceeds to S15 and the YUV format is set to 4: 1: 1 (S16). After that, the condition judgment of S12 and S13 is performed again. When both the results of S12 and S13 are Yes, the process proceeds to S14, and the numerator of the primary resizing rate is set to 8 with the initial value. If either of the determination results in S12 and S13 is No, the process proceeds to S15 again, and the current YUV format is 4: 1: 1, so that the YUV format is reset to 4: 2: 2 in S17, and S18 Then subtract 2 from the initial value of the numerator. The primary resizing ratio at this time is denominator = 8, numerator = 6, YUV format 4: 2: 2. The above operations are repeated to determine the primary resizing rate and the YUV format at the time of writing after the primary resizing.
[0043]
That is, the primary resizing rate and the YUV format after the primary resizing are as follows.
1. If the YUV format is 4: 2: 2, the primary resizing is the same size, the resized data can be stored in the work memory, and there is enough work memory to execute the low-pass filter, the primary resizing ratio is 8/8. YUV format is 4: 2: 2.
2. If the YUV format is 4: 2: 2 and the primary resizing is the same size, the data after resizing will not fit in the work memory, or if there is not enough work memory to execute the low-pass filter, the YUV format will be 4 When 1: 1 is selected, the data after the primary resizing is stored in the work memory, and if there is sufficient work memory for the execution of the low-pass filter, the primary resizing ratio is 8/8, the YUV format is 4: 1: 1
3. If the YUV format is 4: 1: 1 and the primary resizing does not fit in the work memory even if the primary resizing is the same size, or if there is not enough work memory to execute the low-pass filter, the YUV format is set to 4. : 2: 2 If the numerator is 6 and the data after the primary resizing is stored in the work memory and there is enough work memory to execute the low-pass filter, the primary resizing ratio is 6/8, YUV format 4: 2 : 2
[0044]
Here, the primary resizing rate is up to 6/8. However, when it is desired to reduce the data amount as the primary resizing rate, a low pass filter having a larger data reducing rate is applied, for example, the amount of image data immediately after development. It is sufficient to prepare something that is about 1/4 of that.
Of course, it is possible to respond even if the processing is continued until the primary resizing rate becomes 4/8, 2/8.
[0045]
Although the print image data processing is performed in consideration of what has been described so far, a series of data processing flow of this embodiment is as shown in FIG.
[0046]
In this embodiment, a printer capable of printing only the card size and a printer capable of printing the card size, L size, and A6 size are supported, and the YUV format as an initial value is set according to the paper size. However, this initial value setting can be appropriately changed by performing the processes shown in FIGS.
[0047]
Hereinafter, the processing flow will be described. The set Print Mode is acquired (S21). As described with reference to FIG. 4, the print mode can be selected from borderless, bordered, and multi, but which print mode is designated is acquired. In S22, Printer Type is acquired. As described above, in this embodiment, the printer type that can print only the card size and the printer that can print the card, L size, and A6 size are supported, and the Printer Type is acquired. In S23, the printer type acquired in S22 is determined. If the printer can print only the card size, the Paper Type is fixed to the card (S24a). If the printer is capable of card, L size, and A6 size printing, the Paper Type is acquired (S24b). In S25, Paper Type is determined, and the card, L size, and A6 are allocated. In the case of the card size (S26a), the data format of YUV 4: 2: 2 is designated after the primary resizing and after the secondary resizing, and the address of the work memory to which data is written after the primary resizing and after the secondary resizing is designated. . For L size (S26b), specify the data format of YUV4: 2: 2 after primary resizing, YUV4: 1: 1 after secondary resizing, and write the data after primary resizing and after secondary resizing. Specify an address. For A6 size (S26c), YUV4: 2: 2 after primary resizing, YUV4: 1: 1 data format after secondary resizing, and address of work memory where data is written after primary resizing and after secondary resizing Is specified.
[0048]
Here, the image data format after the primary resizing and the secondary resizing is set for each printing paper, but this value varies depending on the usable work memory capacity.
[0049]
That is, in the subsequent S27, the primary resizing rate and the image format after the primary resizing are determined by the procedure described with reference to FIGS. In S28, JPG decompression and primary resizing are performed in the YUV format determined in S27, and the data is written to the work memory. In S29, the data written in the work memory after the primary resizing is read, the secondary resizing is executed, and the data is written in the work memory in the YUV format designated in S26a, b, and c.
[0050]
S30, whether the Print Mode is multi or not is determined. In S31, if it is multi, the secondary resize is further performed after the secondary resize. By performing the resizing process in a divided manner in this way, image quality deterioration can be suppressed somewhat. In S32, sharpness is applied to the image data resized to a desired size. In S33, first, yellow (Y) data is created from image data in the YUV data format. The subsequent processing is performed every time magenta (M) and cyan (C) are created. As a result, you will go through the same routine three times. In S34, Print Mode is determined for fine adjustment and position adjustment of print data. If there is no border, in S36c, the data for several pixels in the peripheral portion of the data after color conversion from the YUV data is discarded and copied to the print data storage area. When there is a border, the print data storage area is filled with white data (FFh) by the amount corresponding to the printing paper in S35b. In S36b, the data for several pixels in the peripheral portion of the data after color conversion from the YUV data is discarded in the print data storage area and copied to the center of gravity. In the case of multi, the print data storage area is filled with white data (FFh) by the amount corresponding to the print paper in S35a. In S36b, a few pixels of data in the peripheral portion of the data after color conversion from the YUV data are discarded in the print data storage area and the same number of images are arranged. In S37, the print data is transferred to the printer.
[0051]
The processing from S33 to S37 is repeated every time magenta (M) and cyan (C) are created.
[0052]
As described above, this print system can be realized.
[0053]
[Second Embodiment]
FIG. 12 shows a configuration diagram of the second embodiment of the present invention. In the second embodiment, an image photographed by a digital camera 1001 and an image stored in a memory medium after photographing and read again are processed into print data of a sublimation printer in the digital camera, and then incorporated in the digital camera. This is an example of color printing with a sublimation printer.
[0054]
The user can select a print mode, an image to be printed, the number of prints, and the like with the operation member 1002 of the digital camera shown in FIG. 12, and can confirm the contents on the liquid crystal screen 1003 of the digital camera.
[0055]
Since the image processing for creating print data is the same as that of the first embodiment and is omitted here, the digital camera and the printer are always integrated, and therefore a mode for automatically starting printing after photographing is provided. Since the print paper is built in beforehand, when this mode is set, the processes of S26a, b, and c in FIG. 11 are automatically selected according to the set paper size.
[0056]
Further, in an ordinary digital camera, the image size obtained by photographing can be selected and set.
[0057]
However, in the case of a mode in which print processing is automatically performed after shooting, the image size obtained by shooting is determined in advance depending on the paper to be used.
[0058]
That is, the user can control troublesome operations only by selecting a mode for automatically performing print processing after shooting, since camera control is performed in accordance with the built-in paper. In such a case, the print obtained can be made as high in image quality as possible according to the sheet by making maximum use of the internal memory.
[0059]
【The invention's effect】
As described above, according to the present invention, when configuring a print system in which a printer device and a photographing apparatus such as a digital camera or a digital video camera are directly connected, or those devices are integrated, The resizing ratio of image conversion method 1 (primary resizing), the image format after image conversion (YUV format), the size of the data area in which the data is expanded after the image size conversion, the image size converted by image conversion method 1 And final target image size, whether to apply a low-pass filter (LPF) before image size conversion, and whether there is enough work memory when executing the low-pass filter. It is possible to use the memory area as effectively as possible without running out of work memory. That. And it became possible to reduce deterioration of the obtained print image as much as possible.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a first embodiment;
FIG. 2 is a diagram for explaining the outline of the sublimation thermal transfer system.
FIG. 3 is a block diagram of a digital camera according to the present embodiment.
FIG. 4 is an explanatory diagram of a print pattern
FIG. 5 is a diagram for explaining the print data size depending on the print paper.
FIG. 6 is a diagram for explaining a print data image processing procedure;
FIG. 7 is a diagram for explaining how to use the work memory when creating print image data.
FIG. 8 is a diagram for explaining a difference in data amount between YUV422 and YUV411.
FIG. 9: Primary resizing ratio, determination flow of YUV format (without low-pass filter)
FIG. 10: Primary resizing ratio, determination flow of YUV format (with low-pass filter)
FIG. 11 is a diagram for explaining the processing flow of the embodiment;
FIG. 12 is a diagram for explaining a second embodiment.

Claims (11)

Capture means for capturing compressed image data from a storage medium in which image data is recorded;
Expansion means for expanding the compressed image data captured by the capture means;
An internal memory for storing image data expanded by the expansion means;
Output means for converting the image data stored in the internal memory into print image data and outputting it;
Before developing the compressed image data by the developing means, there is a selection means for selecting the format of the luminance color difference signal based on the size of the image data after the compressed image data is developed and the free space of the internal memory. An image processing apparatus.   The expansion unit further includes a resizing unit that resizes the image stored in the internal memory according to the size of print image data to be output to the output device, and the selection unit includes the internal unit. The image processing apparatus according to claim 1, wherein a format of the luminance color difference signal and a resizing ratio in the resizing unit are controlled according to a free space of a memory. Furthermore, it has filtering means for applying low-pass filter processing to the image data developed by the developing means,
The selection means determines whether or not a work area for the low-pass filter processing is secured in the internal memory. If the work area cannot be secured, the expansion means uses the format of the luminance color difference signal and the resizing means. The image processing apparatus according to claim 1, wherein the resizing rate is controlled.   The necessity of the low-pass filter processing is determined based on the relationship between the amount of data when the compressed image data is expanded without applying the low-pass filter and the amount of print image data output by the output means. The image processing apparatus according to claim 3.   5. The image processing apparatus according to claim 3, wherein, when the low-pass filter process is applied, the selection unit performs control so that a resizing rate by the resizing unit becomes equal to the same size.   2. The image processing apparatus according to claim 1, wherein the image processing apparatus is a digital camera having an image display means and an imaging means, and has an instruction means for giving an output instruction to an image displayed by the image display means. The image processing apparatus according to claim 5.   The said selection means selects the format of a brightness | luminance color difference signal from the format of the some brightness | luminance color difference signal from which the ratio of the data amount of a brightness | luminance signal and a color difference signal differs, The any one of Claim 1 thru | or 6 characterized by the above-mentioned. The image processing apparatus described. A capturing step of capturing compressed image data from a storage medium on which image data is recorded;
A decompression step of decompressing the compressed image data captured in the capture step;
An internal memory for storing the image data expanded in the expansion step;
An output step of converting the image data stored in the internal memory into print image data and outputting the print image data;
Before expanding the compressed image data in the expanding step, a selection step of selecting the format of the luminance color difference signal based on the size of the image data after expanding the compressed image data and the free space of the internal memory An image processing method comprising:   The expanding step further includes a resizing step for resizing in accordance with the size of print image data to be output to the output device, and according to the free space of the internal memory, the luminance color difference signal format and the resizing step The image processing method according to claim 8, wherein a resizing rate of the image is controlled. And a filtering step for applying low-pass filter processing to the image data developed by the developing means.
In the selection step, it is determined whether or not a work area for the low-pass filter process is secured in the internal memory. If the work area cannot be secured, the format of the luminance color difference signal and the resizing step in the development step are determined. The image processing method according to claim 8, wherein the resizing rate is controlled.   11. A computer-readable recording medium on which a program for executing the image processing method according to claim 8 is recorded.

Images