JP2002271790A - Image compressor, electronic camera and image processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image compressor that divides image data into a plurality of tile images and compresses the image in the unit of the tile images so as to properly adjust occurrence of a discontinuous image deviation. SOLUTION: The image compressor is configured with a tile division section that divides image data by a rectangular border into a plurality of tile images, an image compression section that applies image compression to each tile image resulting from division by the tile division section, a file generating section that incorporates compressed data of each tile image compressed by the image compression section to generate a compression file and also with a division pattern variable section that revises the border of the tile image to vary the division pattern of the tile images.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image compression apparatus for dividing image data into a plurality of tile images and performing image compression for each tile image. The present invention relates to an electronic camera equipped with the image compression device. The present invention relates to an image processing program that divides image data into a plurality of tile images and performs image compression for each tile image.

[0002]

2. Description of the Related Art In December 1999, a committee draft of a JPEG2000 image compression algorithm (CD: Committee Dr.
aft) was created and the core core technical content was frozen. Hereinafter, the image compression processing of JPEG2000 will be briefly described.

Color coordinate conversion The input image is subjected to color coordinate conversion as needed.

Tile division An input image is divided into a plurality of image areas (hereinafter referred to as "tile images"). The subsequent encoding processing is independently performed on each tile image.

Wavelet Transform A tile image is subjected to a discrete wavelet transform in two directions, that is, a plurality of sub-bands (LL, LH, HL, HH).
Is divided into bands. Of these, the LL band in the lowest frequency band is recursively subjected to discrete wavelet transform.

Quantization Wavelet transform coefficients are quantized for each subband. In the unified lossy / lossless processing, the quantization step is set to “1”. in this case,
In the lossy compression, the lower N bit planes are discarded in a subsequent process. This discarding process is a process equivalent to the quantization step “2 to the Nth power”.

Bit Modeling The quantized wavelet transform coefficients are divided into coded blocks of a fixed size (for example, 64 × 64) in each subband. After transform coefficients in each code block are divided into sign bits and absolute values, the absolute values are distributed to a natural binary bit plane. The bit plane constructed in this way is sequentially divided into three types of coding passes (Significance pass, Refinement pass,
Cleanuppass). It should be noted that the sign bit is encoded immediately after the most significant bit of the corresponding absolute value appears on the bit plane.

[0008] ROI (Region Of Interest) coding Information amount is preferentially allocated to a selected area on a tile image,
This is a function for improving the decoding image quality of the selected area. Specifically, the quantized transform coefficient located in the selected area is shifted up by S bits. As a result, the selected area is shifted to a higher-order bit plane, and encoding is performed with priority over any bit in the non-selected area. In the Max shift method, the bit shift number S is set to be larger than the number of digits of the most significant bit of the non-selected area. Therefore, the non-zero transform coefficient in the selected area always takes a value equal to or greater than “2 to the power of S”. Therefore, at the time of decoding, the transform coefficients in the selected area can be easily restored by selectively shifting down the quantized value equal to or larger than “2 to the power of S”.

Arithmetic Coding The coded data is further subjected to arithmetic coding by an MQ coder.

Bit stream formation The coded data of each tile image is put together in a predetermined order (such as SNR progressive) to form a bit stream.

According to the above-described encoding procedure, JPEG
2000 compressed image files are generated. As for the latest JPEG2000, the final committee proposal (http: // ww
By referring to (w.jpeg.org/fcd15444-1.zip), you can know more accurately. Furthermore, after the approval of international standards scheduled for March 2001, ISO
More detailed and accurate international standards can be known through ITU-T and other standard organizations.

[0012]

As described above, each tile image is independently subjected to image compression. Therefore, a compression error occurs independently in each tile image, and the compression error increases as the compression ratio of the image increases. Due to the compression error, discontinuous displacement of the image (such as discontinuous displacement of gradation or discontinuous displacement of picture) is likely to occur in the expanded image at the boundary portion. In particular, when this discontinuous displacement of the image overlaps with a main subject (such as a human face) in the image, there is a problem that the impression of the entire image is greatly impaired. Therefore, an object of the present invention is to appropriately adjust the position at which the above-described discontinuous image shift occurs.

[0013]

To solve the above-mentioned problems, the present invention is configured as follows.

According to a first aspect of the present invention, there is provided an image compression apparatus which divides image data by boundaries and divides the image data into a plurality of tile images, and an image compression method for each tile image divided by the tile division unit. An image compression unit that performs compression, and a file generation unit that generates a compressed file by combining the compressed data of each tile image compressed by the image compression unit, and changes the boundary of the tile image to divide the tile image division pattern It is characterized by further comprising a variable division pattern variable section.

In a second aspect of the present invention, in the image compression apparatus according to the first aspect, the division pattern variable section avoids a selected area to which the image compression section preferentially allocates a code amount. , Set the boundaries of the tile image.

According to a third aspect of the present invention, in the image compression apparatus according to the first aspect, the division pattern variable unit changes the boundary of the tile image according to a user operation.

According to a fourth aspect of the present invention, in the image compression apparatus according to the third aspect, the division pattern variable section receives an input of a range on an image in response to a user operation. And a boundary setting unit that sets a boundary while avoiding the range on the image input by the range input unit.

According to a fifth aspect of the present invention, in the image compression apparatus according to the fourth aspect, the image compression unit comprises:
A range on the image input by the range input unit is set as a selected region, and a code amount is preferentially assigned to the selected region.

<Claim 6> According to a sixth aspect of the present invention, in the image compression apparatus according to any one of the first to fifth aspects, the division pattern variable section moves the position of the boundary. Variable the division pattern of the tile image.

According to a seventh aspect of the present invention, in the image compression apparatus according to any one of the first to fifth aspects, the variable division pattern unit combines adjacent tile images. Then, a part of the boundary is erased to change the division pattern of the tile image.

<Eighth Aspect> According to an eighth aspect of the present invention, in the image compression apparatus according to any one of the first to fifth aspects, the division pattern variable section changes the offset of the position of the boundary. Then, the division pattern of the tile image is changed.

<Claim 9> The image processing program according to the ninth aspect causes a computer to operate the computer according to the first to eighth aspects.
And a function as a tile division unit, an image compression unit, a file generation unit, and a division pattern variable unit.

According to a tenth aspect of the present invention, there is provided an electronic camera, comprising: the image compression apparatus according to any one of the first to eighth aspects; And a recording unit for storing a file. In this electronic camera, the image data generated by the imaging unit is converted into a compressed file by the image compression device, and is stored in the recording unit.

<Eleventh Aspect> According to an eleventh aspect of the present invention, in the electronic camera according to the tenth aspect, the image data generated by the imaging unit is displayed, and whether or not the image data is compressed and stored is determined by the user. A display confirmation unit determined by an operation is provided. Further, when displaying the image data, the display confirmation unit also displays the division pattern of the tile image together and confirms the suitability of the division pattern by a user operation.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, claims 1 to 8, 10, and 11 will be described.
An embodiment corresponding to the present invention will be described.

<< Structure of Embodiment >> FIG. 1 is an external view of an electronic camera 11 according to this embodiment. FIG. 2 is a block diagram schematically showing the inside of the electronic camera 11. 1 and 2, an electronic camera 11 includes a photographic lens 12
Is attached. The light receiving surface of the image sensor 13 is arranged in the image space of the taking lens 12. The output of the image sensor 13 is output via an AD converter 14 and a signal processor 15
It is provided to the buffer memory 16. An image processing unit 17 and an image encoding unit 18 are connected to the data bus of the buffer memory 16, respectively.

This image encoding unit 18 is a JPEG200
In order to execute the image compression process defined as 0, the following configuration requirements are provided. Tile division unit 20 Color conversion unit 21 Wavelet conversion unit 22 Quantization unit 23 Bit modeling unit 24 Arithmetic coding unit 25 Bit stream generation unit 26 ROI setting unit 27

The compressed file generated by the image encoding unit 18 is provided to the recording unit 32. The recording unit 32 records and stores the compressed file on the memory card 33. The image bus 34 is also connected to the data bus of the buffer memory 16. This image display unit 34
Displays the image data in the buffer memory 16 on the liquid crystal screen 35 on the back of the housing. A range input unit 36 such as a touch panel is attached on the liquid crystal screen 35. The range input unit 36 detects a range input by a finger or a pen. Further, a decision button 37 and a selection button 38 are also provided on the housing of the electronic camera 11. Output signals of these operation members 36 to 38 are given to a microprocessor 39 in the electronic camera 11. The microprocessor 39 includes an image processing unit 17, an image encoding unit 1
8. System control of the recording unit 32 and the image display unit 34 is executed.

<< Correspondence with the Invention >> The correspondence between the items described in the claims and the present embodiment will be described below. It should be noted that the correspondence relationship here is merely an example for reference, and does not limit the present invention.

Regarding the correspondence between the items described in claims 1 to 3 and 5 to 8 and this embodiment, the tile dividing section corresponds to the tile dividing section 20, the image compressing section is the color converting section 21, the wavelet transforming section. 22, a quantization unit 23, a bit modeling unit 24, an arithmetic coding unit 25, and an ROI setting unit 27, a file generation unit corresponds to the bit stream generation unit 26, and a division pattern variable unit is a microprocessor 39.
And the range input unit 36.

Regarding the correspondence between the items described in claim 4 and the present embodiment, the range input section corresponds to the range input section 36, and the boundary setting section corresponds to the microprocessor 39.

Regarding the correspondence between the items described in claim 10 and the present embodiment, the image pickup unit corresponds to the image pickup device 13, the AD conversion unit 14, and the signal processing unit 15, and the recording unit corresponds to the recording unit 3
Corresponds to 2.

With respect to the correspondence between the items described in claim 11 and the present embodiment, the display confirmation section corresponds to the image display section 34, the microprocessor 39, the enter button 37, and the select button 38.

<< Description of Operation of the Present Embodiment >> FIG. 3 is a flowchart for explaining the operation of the present embodiment. Hereinafter, the operation of the present embodiment will be described in the order of the step numbers shown in FIG.

Step S1: The image pickup device 13 picks up a subject image in response to a release operation and generates analog image data. This image data is digitized via the AD conversion unit 14 and then supplied to the signal processing unit 15. The signal processing unit 15 performs real-time processing such as black level correction and gradation conversion on the image data, and temporarily records the image data in the buffer memory 16. The image processing unit 17 accesses the image data in the buffer memory 16 and performs two-dimensional image processing such as color interpolation processing.

Step S2: Next, the microprocessor 39 inquires of the ROI setting section 27 whether or not the selection area has been set. Here, when the selected area is not set in the ROI setting unit 27, the microprocessor 39 shifts the operation to Step S3. On the other hand, if the selected area has been set in the ROI setting unit 27 in advance, the microprocessor 39 shifts the operation to step S4.

Step S3: If the selected area is not set in advance, the microprocessor 39 initializes the setting information of the division pattern so that the image data is equally divided into a predetermined number. The dotted border shown in FIG. 4 is a diagram showing the initial state of this division pattern. After this action,
The microprocessor 39 shifts the operation to step S5.

Step S4: If the selected area has been set in advance, the microprocessor 39 creates setting information of the divided pattern avoiding the selected area. Note that, here, it is preferable to perform any one of the following setting operations. The boundary movement mode microprocessor 39 determines the upper end, lower end, left end, and right end of the selected area. Next, the microprocessor 39 sequentially sets vertical and horizontal boundaries so that the image data is equally divided. At this time, when the vertical boundary line is located between the left end and the right end of the selection area, the microprocessor 39 sets this boundary line to the left end /
Move to the right end, whichever is closer. The movement of the horizontal boundary line is performed in the same manner. FIG. 5 shows a division pattern set by such a boundary movement. Tile combination mode-First, the microprocessor 39
Sets the division pattern by dividing the image data equally.
Next, the microprocessor 39 selects a tile image including at least part of the selected region from among the tile images thus equally divided. Microprocessor 39
Deletes the border between tile images so as to combine the selected tile images. FIG. 6 shows a division pattern set by such tile composition. Offset change mode ... First, the microprocessor 39 sets the division pattern by equally dividing the image data. Next, the microprocessor 39 entirely changes the offset of the boundary line so that the selected region is included therein and the boundary line does not pass through the selected region. FIG. 7 shows a division pattern set by such an offset change. In this case, as shown in FIG. 8, it is preferable to reduce the total number of tile images by combining the odd tiles T located at both ends of the screen.

Step S5: Microprocessor 39
Gives the setting information of the division pattern to the image display unit 34. The image display unit 34 combines the image data in the buffer memory 16 with the division pattern, and displays it on the liquid crystal screen 35 as shown in FIG.

Step S6: The user checks the display on the liquid crystal screen 35 (FIG. 9). In this state, the user can operate the selection button 38 and the determination button 37 to select whether to compress and save the image data being displayed on the monitor. Further, the user can input the range of the main subject on the screen via the range input unit 36. The microprocessor 39 branches the operation according to these user operations. That is, when “do not compress and save” is selected (NO in FIG. 9), the microprocessor 39 performs the operation in step S in preparation for the next imaging operation.
Return to 1. When “compress and save” is selected (YES in FIG. 9), the microprocessor 39 determines that both the image data being displayed and the divided pattern have been approved by the user, and shifts the operation to step S9. I do.
On the other hand, when the range is input via the range input unit 36 (shaded portion in FIG. 9), the microprocessor 39 determines that the division pattern needs to be adjusted, and shifts the operation to step S7.

Step S7: Microprocessor 39
Avoids the range input through the range input unit 36,
Create the setting information of the division pattern. Note that the details of the setting operation here are the same as those in step S4 described above, and a description thereof will not be repeated.

Step S8: Microprocessor 39
Creates a mask image of the range input through the range input unit 36 and sets it in the ROI setting unit 27 as a selected area. Thereafter, the microprocessor 39 returns the operation to Step S5. As a result, the operations of steps S5 to S8 are repeated until the user approves the division pattern.

Step S9: Microprocessor 39
Gives the setting information of the division pattern to the tile division unit 20. The tile division unit 20 divides the image data in the buffer memory 16 into tile images and reads out the image data based on the setting information of the division pattern.

Step S10: The image encoding unit 18
JPEG2000 compression encoding is executed for each tile image. That is, the color conversion unit 21 converts the tile image into color components such as YCbCr by color coordinate conversion. The wavelet transform unit 22 recursively performs a wavelet transform on the tile image after the color coordinate transformation to convert the tile image into a transform coefficient for each subband. Quantizer 23
Performs a predetermined quantization on this transform coefficient. The bit modeling unit 24 divides the quantized transform coefficients into bit planes. At this time, the bit modeling unit 24
The information of the selected area is obtained from the I setting unit 27, and the conversion coefficient corresponding to the selected area is shifted up to the upper plane. The bit modeling unit 24 performs three kinds of encoding passes on the bit plane thus created in order from the most significant bit. The arithmetic encoding unit 25 further arithmetically encodes the encoded data processed by the bit modeling unit 24.

Step S11: The bit stream generation unit 26 generates a compressed file by combining the encoded data of each tile image in a prescribed order.

Step S12: The recording section 32 records this compressed file on the memory card 33. By a series of these operations, the operation of the present embodiment is completed.

<< Effects of this Embodiment >> According to the above-described operation, in this embodiment, it is possible to appropriately set the boundaries of tile images while avoiding the main subject. As a result, in the decompressed image data, it is possible to avoid a situation in which a discontinuous shift occurs by overlapping the main subject. In particular, in the present embodiment, when a selection region is set for ROI encoding, the boundary of the tile image is set avoiding the selection region. Therefore, it is possible to appropriately set the boundary of the tile image while avoiding the main subject in the selected area.
Further, in the present embodiment, the user can confirm the division pattern on the liquid crystal screen 35 and then reset the division pattern via the range input unit 36.

<< Supplementary Items of the Embodiment >> In the above-described embodiment, the electronic camera 11 including the image compression device has been described. However, the present invention is not limited to this. For example, the procedure of this embodiment (steps S2 to S11 shown in FIG. 3) may be implemented as software to create an image processing program (corresponding to claim 9). By causing the computer to execute the image processing program, it is possible to obtain the same functions and effects as those of the present embodiment.

In the above-described embodiment, the division pattern is set based on the range input by the user. However, the present invention is not limited to this. For example, a plurality of representative division patterns may be prepared on the electronic camera 11 side, and the user may select and operate this division pattern. In addition, the user may finely adjust the division pattern by performing a moving operation or an erasing operation on the boundary of the tile image.

Further, for example, the image processing unit 17 extracts an edge portion from the image data, and
May set the boundary of the tile image avoiding the edge portion. In this setting, it is preferable to perform an adjustment process for minimizing the number of intersections between the boundary of the tile image and the edge portion.

In the above-described embodiment, the selection area is set after the division pattern setting operation is performed.
However, the present invention is not limited to this. For example, when the ROI coding is not performed, the setting of such a selection area may not be performed (at this time, step S8 is not performed). Further, when the selected region for ROI coding is fixed in advance, it is not necessary to set the selected region.

Further, the above-described embodiment uses the JPEG20
The case where the image compression processing of 00 is performed has been described. However, the present invention is not limited to this. In general, the present invention can be applied to general image compression in which image data is divided into tiles and compressed.

In the above embodiment, the division pattern is set in accordance with the user's input. However, the present invention is not limited to this.
For example, it is assumed that an area limitation or a size limitation is imposed on a tile image due to factors such as a processing buffer capacity.
In such a case, it is preferable to set the division pattern according to the user input within the range of the area limitation and the dimension limitation.

[0054]

According to a first aspect of the present invention, there is provided an image compression apparatus including a division pattern variable unit. The division pattern variable unit can change the division pattern of the tile image. As a result, it is possible to set the boundary of the tile image while avoiding the main subject. Therefore, in the expanded image data, it is possible to avoid a situation where a discontinuous displacement occurs in a main subject or the like.

<< Claim 2 >> The image compression apparatus according to claim 2 is
Set the boundaries of the tile image avoiding the selected area. Since the selected area has particularly little image degradation due to compression, it is often set in alignment with the main subject. Therefore, by setting the boundary of the tile image while avoiding the selected area, it is possible to avoid the main subject with a high probability. Such a setting of the boundary is very excellent in that the operation load on the user can be reduced since no manual operation is required. When the selection area and the boundary of the tile image intersect, a discontinuous displacement may start immediately outside the selection area. The invention of claim 2 is also excellent in that such unnatural discontinuous displacement can be prevented and the shape of the selected area can be made inconspicuous.

<< Claim 3 >> An image compression apparatus according to claim 3 is
Change the boundaries of tile images according to user operations. Therefore, the user can appropriately set the boundary of the tile image while avoiding the main subject and the like.

<< Claim 4 >> The image compression apparatus according to claim 4 is
A range input unit is provided for receiving a range input on the image from the user. The device side automatically sets the boundary of the tile image while avoiding the input range of the range input section. In this case, the user only needs to input an important range on the screen as it is, without being particularly aware of the division pattern of the tile image. Therefore, it is possible to save the troublesome and complicated work of the user operating the division pattern one by one.

<Claim 5> An image compression apparatus according to claim 5 is
The input range of the range input unit is diverted as a selection area, and the code amount is preferentially assigned to the selection area. Therefore, the user can specify the division pattern and the selection region at one time, and can rationally save the trouble of inputting the selection region separately.

<< Claim 6 >> An image compression apparatus according to claim 6 is
The position of the boundary is moved to change the division pattern of the tile image.

<Claim 7> An image compression apparatus according to claim 7 is
Adjacent tile images are combined to change the tile image division pattern.

<< Claim 8 >> The image compression apparatus according to claim 8 is
The offset position of the boundary of the tile image is changed to change the division pattern of the tile image. Such an offset change does not change the maximum area of the tile image. Therefore, a fixed capacity (capacity corresponding to the maximum area) may be ensured in the buffer at the time of image compression, and an image compression apparatus suitable for IC or software is realized.

[Claim 9] An image processing program according to a ninth aspect of the present invention is directed to a computer for controlling the tile division unit, the image compression unit, the file generation unit, and the division pattern variable unit according to any one of the first to eighth aspects. Function as Therefore, it is possible to realize the image compression device according to any one of claims 1 to 8 on a computer.

<Claim 10> Normally, once a discontinuous shift has occurred on an image, it is difficult to completely recover it.
Therefore, an electronic camera according to a tenth aspect is equipped with the image compression device according to any one of the first to eighth aspects, and varies the division pattern from the first image compression immediately after imaging. Therefore, it is possible to reliably avoid a situation in which a discontinuous shift that is difficult to restore overlaps a desired subject from the first image compression.

[Claim 11] The electronic camera according to claim 11 confirms the suitability of the division pattern together with the user when confirming whether to compress and save the image data. Therefore, the user can perform both checking operations at once, and an electronic camera that is easy to use is realized.

[Brief description of the drawings]

FIG. 1 is an external view of an electronic camera 11 according to an embodiment.

FIG. 2 is a block diagram showing the inside of the electronic camera 11;

FIG. 3 is a flowchart illustrating the operation of the embodiment.

FIG. 4 is a diagram showing an initial state of a division pattern.

FIG. 5 is a diagram showing an example of a division pattern by boundary movement.

FIG. 6 is a diagram illustrating an example of a division pattern by tile combination.

FIG. 7 is a diagram illustrating an example of a division pattern by an offset change.

FIG. 8 is a diagram illustrating an example of a division pattern by an offset change.

FIG. 9 is a diagram showing a display example of confirmation before recording.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electronic camera 12 Photographing lens 13 Image sensor 14 AD conversion part 15 Signal processing part 16 Buffer memory 17 Image processing part 18 Image encoding part 20 Tile division part 21 Color conversion part 22 Wavelet transformation part 23 Quantization part 24 Bit modeling part 25 Arithmetic encoding unit 26 Bit stream generation unit 27 ROI setting unit 32 Recording unit 33 Memory card 34 Image display unit 35 Liquid crystal screen 36 Range input unit 37 Enter button 38 Select button 39 Microprocessor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H04N 101: 00 H04N 7/133 Z F term (Reference) 5C022 AA13 AC03 AC31 5C059 KK01 LC03 MA00 MA24 MC11 MC38 ME11 PP01 PP16 SS15 TA60 TB08 TC34 TC47 TD18 UA02 5C078 AA04 BA35 BA44 BA53 CA22 DA01 5J064 AA01 BA13 BA15 BB12 BC01 BC02 BC06 BC16 BC29 BD03

Claims (11)

[Claims] 1. A tile division unit that divides image data at a boundary and divides the image data into a plurality of tile images; an image compression unit that performs image compression for each of the tile images divided by the tile division unit; A file generation unit that generates a compressed file by combining the compressed data of each tile image compressed by the unit, and changing a boundary of the tile image to change a division pattern of the tile image. An image compression device, further comprising: 2. The image compression apparatus according to claim 1, wherein the image compression unit has a function of preferentially allocating a code amount to a selected area preset in the image data and compressing the selected area. The image compression apparatus, wherein the division pattern variable unit sets the boundary while avoiding the selected area. 3. The image compression apparatus according to claim 1, wherein the division pattern changing unit changes a boundary of the tile image according to a user operation. 4. The image compression device according to claim 3, wherein the divided pattern variable unit is input by a range input unit that receives an input of a range on an image in accordance with a user operation, and input by the range input unit. An image compression device comprising: a boundary setting unit that sets the boundary while avoiding the range on the image. 5. The image compression apparatus according to claim 4, wherein the image compression unit sets a range on the image input by the range input unit as a selection area, and codes the selection area preferentially. An image compression apparatus characterized in that an amount is assigned and compressed. 6. The image compression device according to claim 1, wherein the division pattern variable unit changes a position of the boundary to change a division pattern of the tile image. An image compression apparatus characterized by the above-mentioned. 7. The image compression apparatus according to claim 1, wherein the division pattern variable unit combines adjacent tile images to partially erase the boundary, and An image compression apparatus characterized by changing a division pattern of a tile image. 8. The image compression device according to claim 1, wherein the division pattern variable unit changes an offset of the boundary to change a division pattern of the tile image. An image compression apparatus, comprising: 9. An image for causing a computer to function as the tile division unit, the image compression unit, the file generation unit, and the division pattern variable unit according to any one of claims 1 to 8. Processing program. 10. The method according to claim 1, wherein:
The image compression apparatus according to claim 1, further comprising: an imaging unit that captures a subject image to generate image data; and a recording unit that stores a file. The image compression apparatus stores the image data generated by the imaging unit in the image compression apparatus. The electronic camera converts the compressed file into the compressed file and stores the compressed file in the recording unit. 11. The electronic camera according to claim 10, further comprising: a display confirmation unit that displays the image data generated by the imaging unit and determines whether to compress and save the image data by a user operation. The electronic camera according to claim 1, wherein the display confirmation unit displays the division pattern of the tile image together when displaying the image data, and confirms whether the division pattern is appropriate by a user operation.