JP2003037740A - Electronic device and digital still camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device and a digital still camera, which make it possible to generate or transmit coded data in a format convenient for each of peripheral devices to which the coded data are transmitted. SOLUTION: The electronic device or the digital still camera includes a processor for compressing image data by coding the image data, so as to generate coded data; a data communicating section for performing a bilateral data- communication with a peripheral device; and a determining section for determining a coding method for cording the image data, based on information pertaining to the peripheral device, which are acquired by the data communicating section. The processor codes the image data, on the basis of the coding method determined by the determining section, to generate the coded data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device and a digital still camera, and more particularly to a peripheral device that processes data generated by the electronic device and the digital still camera,
Particularly preferably, the present invention relates to an electronic device and a digital still camera capable of generating or transmitting coded data in a convenient format according to the peripheral device on the other side transmitting the data.

[0002]

2. Description of the Related Art A digital still camera converts a subject image picked up by an image pickup device such as a CCD into multivalued image data. Since this multi-valued image data contains a great deal of information, when it is stored in an external storage medium such as a memory card or transmitted to peripheral devices such as computer terminals, printers, mobile terminals, etc., the amount of data is small. There is a problem in that the processing time becomes very long and the processing time becomes very long.

Therefore, in general, in order to reduce the data storage amount and the transmission time, the obtained multi-valued image data is encoded and compressed to significantly reduce the data amount. Be seen.

As a general coding / compression technique, the image data of the original image is divided into a plurality of blocks, and the pixel values in each block are subjected to DCT by using the discrete cosine transform (DCT).
JPEG, which is an international standard encoding method for still images, is known in which a T coefficient is obtained, the DCT coefficient is quantized by a predetermined quantization step, and then encoded.

[0005]

However, when transmitting encoded data to a peripheral device, such a peripheral device as a printer is desired to start printing early even during data transmission. In this case, the method of transmitting the encoded data needs to be performed sequentially, but there is a problem that the image content cannot be determined until all the data is transmitted.

On the other hand, in JPEG, as an extension method, a progressive coding method is defined in which the outline of the image content can be grasped at an early stage by gradually refining the image. However, in this method, data is transmitted. When the peripheral device used is a printer, printing cannot be started until all the data has been sent.

In addition, depending on the peripheral device on the other side transmitting the encoded data, the data size may be too large to be transmitted, and not only the time for transmitting the data but also the data itself is wasted. There is also the problem of becoming.

The present invention has been made in view of such conventional circumstances, and generates encoded data in a convenient format according to the peripheral device that processes the data or the peripheral device on the other side that transmits the data. Alternatively, it is an object to provide an electronic device and a digital still camera which can be transmitted and are excellent in usability.

[0009]

According to the present invention for solving the above-mentioned problems, data is transmitted and received between an image processing means for compressing image data by encoding to obtain encoded data and a peripheral device. The image processing unit includes a data communication unit and a determining unit for determining an encoding method of the image data based on the peripheral device information acquired by the data communicating unit. Encoding the image data based on the determined encoding method,
An electronic device, characterized in that the encoded data is obtained.

Further, the image pickup optical system, an image pickup means for picking up an optical image formed by the image pickup optical system to obtain image data, and the image data obtained by the image pickup means are encoded and compressed. An image processing unit that obtains encoded data, a data communication unit that transmits and receives data to and from a peripheral device, and an encoding method of the image data based on the information of the peripheral device acquired by the data communication unit. Determining means for determining, and the image processing means encodes the image data based on the encoding method determined by the determining means to obtain the encoded data. It is a digital still camera.

Further, the image data obtained by the image processing means for compressing the image data by encoding to obtain the encoded data, the data communication means for transmitting and receiving the data to and from the peripheral device, and the data communication means. An electronic device, comprising: a data conversion unit that rearranges a transmission order of encoded data based on information of a peripheral device.

Further, an image processing means for subjecting image data to wavelet transformation to generate hierarchical structure data for each frequency band, dividing this into a plurality of block areas, encoding each block area, and compressing the image data. A data communication unit that transmits and receives data to and from the peripheral device, and the transmission order of the encoded data for each block area to the peripheral device is arranged based on the information of the peripheral device acquired by the data communication unit. And an electronic device having a data conversion unit for changing.

Further, the image data is obtained by the image processing means for compressing the image data by encoding to obtain the encoded data, the data communication means for transmitting and receiving the data to and from the peripheral device, and the data communication means. And a recompression unit that recompresses the image data compressed by the image processing unit, based on the information of the peripheral device.

Furthermore, image processing means for subjecting image data to wavelet transformation to generate hierarchical structure data for each frequency band, dividing this into a plurality of block areas, encoding each block area and compressing the image data. And a data communication unit that transmits and receives data to and from the peripheral device, and a recompressor that recompresses the image data compressed by the image processing unit based on the information of the peripheral device acquired by the data communication unit. And an electronic device.

Furthermore, the photographing optical system, the image pickup means for picking up an optical image formed by the photographing optical system to obtain image data, and the image data taken in by the image pickup means are encoded and compressed. Then, based on the information of the peripheral device acquired by the image processing means for obtaining the encoded data, the data communication means for transmitting and receiving the data to and from the peripheral device, and the transmission order of the encoded data. And a data conversion means for rearranging the data.

Further, a photographing optical system, a photographing means for photographing the optical image formed by the photographing optical system to obtain image data, and a wavelet transform for the image data fetched by the photographing means to obtain a frequency band. An image processing unit that generates hierarchical structure data for each, divides this into a plurality of block areas, encodes each block area to compress the image data, and a data communication unit that transmits and receives data between the peripheral device. And a data conversion unit that rearranges the transmission order of the encoded data for each block area to the peripheral device based on the peripheral device information acquired by the data communication unit. Is.

Further, the image pickup optical system, an image pickup means for picking up an optical image formed by the image pickup optical system to obtain image data, and the image data taken in by the image pickup means are encoded and compressed. An image processing unit that obtains encoded data, a data communication unit that transmits and receives data to and from the peripheral device, and the image processing unit that compresses the image data based on the information of the peripheral device acquired by the data communication unit. And a recompression means for recompressing the image data.

Furthermore, a photographing optical system, an image pickup means for picking up an optical image formed by the photographing optical system to obtain image data, and a wavelet transform for the image data taken in by the image pickup means to obtain a frequency band. An image processing unit that generates hierarchical structure data for each, divides this into a plurality of block areas, encodes each block area to compress the image data, and a data communication unit that transmits and receives data between the peripheral device. And a recompression unit that recompresses the image data compressed by the image processing unit based on the information of the peripheral device acquired by the data communication unit.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An outline of the present invention is shown in FIG. 14 (a) so that encoded data can be generated or transmitted in a convenient format according to a peripheral device on the other side transmitting the data. As described above, first, the encoded data is generated from the image data based on the predetermined encoding method, and the transmission order for transmitting the encoded data to the peripheral device is arranged based on the acquired information about the peripheral device. Changing and FIG.
As shown in (b), before obtaining the encoded data from the image data, the peripheral device information is acquired in advance, and the image data encoding method is determined based on the peripheral device information. It is to generate encoded data from image data based on the determined encoding method.

With respect to the details of the embodiments of the present invention, the former invention will be described first, and then the latter invention will be described.

FIG. 1 is a block diagram showing an overall schematic configuration of a digital still camera which is an example of an electronic device.
In the figure, 1 is a control unit, 2 is a switch input unit, 3 is a photographing optical system, 4 is an image sensor, 5 is an A / D converter, 6 is a signal processing unit, 7 is an arithmetic processing unit, and 8 is an external storage medium. An interface unit, 9 is an image display unit, and 10 is a data transmission / reception interface unit.

The control unit 1 activates and controls a sequence of photographing / recording / reproduction and data transmission / reception in response to an input signal from a switch input unit 2 including a power switch and various operation switches.

An optical image obtained by photographing and recording through a photographing optical system 3 including a lens is formed on a light receiving surface of an image pickup device 4 such as a CCD. The image pickup element 4 photoelectrically converts the formed optical image and sends the converted analog image signal to the A / D converter 5.

The A / D converter 5 converts the analog image signal sent from the image pickup device 4 into a digital image signal for each pixel and sends it to the signal processing section 6. The signal processing unit 6 converts the color components (R, G, B) of the digital image signal for each pixel into luminance color difference signals (Y, Cb, Cr) and sends them to the arithmetic processing unit 7 which is an image processing unit. The image signal converted into the luminance color difference signal is image-compressed in the arithmetic processing unit 7.

The configuration of the arithmetic processing unit 7 will be described with reference to the block diagram shown in FIG. In the present embodiment, the arithmetic processing unit 7 employs a method of encoding an image signal using discrete wavelet transform.

The image signal for each pixel converted into the luminance color difference signal by the signal processing unit 6 is first subjected to discrete wavelet conversion in the wavelet conversion unit 7a in the arithmetic processing unit 7. That is, the wavelet transform unit 7a performs a known discrete wavelet transform on each pixel data of one screen input from the signal processing unit 6 and decomposes it into a plurality of frequency bands called subbands.

This discrete wavelet transform is shown in FIG.
As shown in FIG. 4, the original image data shown in (a) is applied to a low-pass filter (LPF) and a high-pass filter (HPF), respectively, in the order of the horizontal direction and the vertical direction to convert the frequency components into low-frequency components (L). High frequency component (H)
And the data is downsampled to ½, and LL, HL, L as shown in FIG.
Subband coding is performed on a subblock composed of four components H and HH.

Then, the LL component of the four generated sub-blocks is subjected to the same processing as described above to further divide the LL component into four sub-blocks.
LLLL, LLHL, LLLH, L as shown in (c)
Hierarchical structure data is generated by subband coding into seven subblocks of LHH, HL, LH, and HH.

The wavelet transform coefficients (hierarchical structure data) generated by the above-mentioned subband coding are once stored in the buffer 7b, and then LLLL, LLHL, LL.
Quantization unit 7c in the order of LH, LLHH, HL, LH, HH
Sent to.

In the case of image data having a large number of pixels, the LLLL component is further divided into sub-blocks by performing the same processing as described above, and as shown in FIG. It is also possible to have data.

The quantizing unit 7c quantizes the wavelet transform coefficient for each sub-band output from the buffer 7b at a quantizing step determined for each sub-band.
The quantization step in the quantization unit 7c is 1,
Substantially no quantization is required.

The quantizing unit 7c quantizes all the wavelet transform coefficients in one subband, and then outputs the quantized value (quantized wavelet transform coefficient) to the coefficient bit modeling unit 7d.

In the coefficient bit modeling section 7d, the quantized value of the wavelet transform coefficient quantized by the quantizing section 7c is converted into an MS having a large energy as shown in FIG.
Low energy from B (Most Significant Bit) L
Bit planes are formed into a plurality of bit planes BP1, BP2, ... BPn in the order of SB (Least Significant Bit).

Next, the quantized data of the wavelet transform coefficient that has been converted into bit planes is output to the encoding unit 7e and encoded. In the present embodiment, publicly known arithmetic coding is carried out in the coding unit 7e.

The coding unit 7e divides the quantized wavelet transform coefficient into a plurality of coding blocks (block areas) called code blocks for each sub-block. FIG. 6 shows an example in which one sub block is divided into 16 × 16 coded blocks. Each bit plane is further divided into stripes, and in each coded block, the stripes are vertically scanned from the upper left direction to perform arithmetic coding. In the illustrated example, the stripe width is 4.

The image data encoded by the encoding unit 7e is generated as an image compression file with a necessary header and the like added.

In the case of generating a resolution progressive file, which is a hierarchical coding method, for example, this image compression file is first supported in the file header by the number of horizontal and vertical pixels, block arrangement, and is supported, as shown in FIG. After information such as resolution is written, as described above, MS
Coded data of a code block of a subband having the lowest frequency component of the B bit plane (for example, the LLLLLL component in FIG. 3D) is written. Here, the hierarchical encoding method refers to a method in which a plurality of images having different resolutions are created step by step from one image and encoded.
Particularly preferably, a plurality of images having different resolutions are recursively created from one still image, and the data is configured in a pyramid type with the highest resolution image as the base and the lowest resolution image as the apex. The encoding method.

Next, the coded data of the code block corresponding to the position of the code block on the plane immediately below the MSB is written. The same process is repeated until the LSB plane. Further, the position of the code block is moved and the encoded data from MSB to LSB is written in the same manner as above. In this way, after all the subbands of one frequency component are encoded, the encoded data of the code blocks of the subbands of the high frequency component are sequentially written.

The length of the block is described at the beginning of the coded data for each code block, and the data can be rearranged in block units based on this information.

The image compression file thus generated is output from the encoded data output unit 7f and stored in the external storage medium M such as a memory card via the external storage medium interface unit 8 shown in FIG. It

The encoding method has been described above by taking the case of generating a resolution progressive file, which is a hierarchical encoding method, as an example. However, the encoding method is not limited to this, and one image is used as image data. A sequential encoding method, which is a method of encoding in the order of, may be used.

On the other hand, at the time of reproduction, the image compression file read from the external storage medium M through the external storage medium interface unit 8 is output from the encoded data input unit 7g of the arithmetic processing unit 7 as shown in FIG. The data is output to the expansion processing unit 7h and expanded. The luminance / color difference signal generated by the expansion processing is output from the expansion data output unit 7i to the signal processing unit 6. Here, after being converted into a signal suitable for display, the signal is output to the image display unit 9 including a display device such as an LCD and the image is displayed.

Data transmission / reception to / from external peripheral equipment such as a printer or a portable terminal is performed via a data transmission / reception interface section 10 which is a data communication means. In the present embodiment, the control unit 1 at the start of data transmission / reception with the peripheral device, type information of the peripheral device connected to the data transmission / reception interface unit 10, for example, information such as a printer or a mobile terminal, and an output horizontal level. Information such as the number of pixels and the number of vertical pixels is acquired.

Next, the control unit 1 reads the image compression file from the external storage medium M via the external storage medium interface unit 8, and the encoded data input unit 7 of the arithmetic processing unit 7 is read.
Enter in g.

The coded data input to the coded data input unit 7g is temporarily stored in the buffer 7j, and then, in the coded data conversion unit 7k, the above-mentioned peripherals obtained by the data transmission / reception interface unit 10 in the control unit 1. Based on the device type information, the code strings are rearranged so that the data format is convenient for the peripheral device.

That is, the encoded data conversion unit 7k rearranges the transmission order of the encoded data for each encoded block to the peripheral device based on the peripheral device information acquired by the data transmission / reception interface unit 10. This is a data conversion unit, which recognizes blocks from the number of horizontal and vertical pixels and block arrangement information described in the file header and the block length at the beginning of each code block, and performs a process of rearranging the data.

FIG. 8 shows an example in which compressed data generated by arithmetically coding each code block in this embodiment is hierarchically expressed in ascending order of resolution. (A) is an example of an image in which the resolution is sequentially increased from a low resolution image A to B, C, and (b) is an example of each image A, B, C
Data A1, A2, ...
The state of C64 is shown. Although the bit planes for each resolution are not shown here for simplification of description, for example, the data A1 includes coded data of a code block corresponding to the position for each bit plane. , Are treated and processed in the same manner as the data A1.

In the present invention, for example, when the peripheral device connected to the data transmission / reception interface unit 10 is a mobile terminal, the encoded data conversion unit 7k based on the acquired type information, as shown in FIG. , The data of the image compression file is A1, A2, A3, A4, B1,
B2, B3, B4, B5, ... C63, C64 are rearranged, and the encoded data rearranged in this way is transmitted from the encoded data output unit 7f to the peripheral device connected to the data transmission / reception interface unit 10.

In the peripheral device (portable terminal) to which this coded data is transmitted, a predetermined decompression process is performed, and then the process shown in FIG.
As shown in (a), the image is reproduced with the resolution gradually increasing from the image with the small resolution, so that the receiving side can quickly determine the image content.

The data transmission / reception interface unit 10
When the peripheral device connected to the printer is a printer, the encoded data conversion unit 7k is based on the acquired type information.
In FIG. 9, as shown in FIG. 9, the data of the image compression file is changed to A1, B1, B2, B5, B6, C1, C2, C.
3, C4, C9, C10, ... are rearranged and transmitted from the encoded data output unit 7f to the peripheral device connected to the data transmission / reception interface unit 10.

In the peripheral device (printer) which receives the encoded data, the image is reproduced sequentially by the predetermined decompression processing, so that the printing can be executed immediately from the top of the image even during the communication. Becomes

In the present invention, when the displayable image size or printable image size of the peripheral device is known from the peripheral device type information acquired from the data transmission / reception interface unit 10 by the control unit 1. It is also preferable to delete the data of unnecessarily high resolution from the hierarchical structure data before transmitting the data.

For example, when the peripheral device on the receiving side is a portable terminal and the image C having a high resolution as shown in FIG. 8 (a) cannot be displayed, as shown in FIG.
A2, A3, A4, B1, B2, ... B15, B16 are rearranged and the high resolution image data (image data on the C side) is deleted, and the data format is changed to the peripheral device (mobile terminal). ) To.

Further, when the peripheral device on the receiving side is a printer, an image C having a high resolution as shown in FIG.
If you cannot print the A, B, as shown in FIG.
1, B2, B5, B6, A2, B3, ... B15, B16
Then, the data transmission / reception interface unit 10 transmits the high resolution image data (image data of the C plane) to the peripheral device (printer) in the data format.

As described above, by rearranging the data according to the type information of the peripheral device on the receiving side and deleting the data having an unnecessarily high resolution before transmission, the image data can be transmitted more efficiently. It becomes possible, the transmission time can be shortened, and the data corresponding to the memory capacity of the receiving side is transmitted.

In this case, since the transmitting side intentionally sends the data in which the image information is partially deleted to the peripheral device, although not shown, a warning means is provided in the present invention, and the control section 1 controls the transmission. It is preferable to display a warning by using the image display unit 9 or the like so that the user can confirm the warning.

Further, there is provided a selection means for selecting whether to delete a part of the data and send it to the peripheral device, or to send the data that is not deleted as it is, and prior to this sending, the user is given the above-mentioned sending form. It is also preferable to be free to choose. It should be noted that whether to delete a part of the data and send it to the peripheral device or to send the data that is not deleted as it is may be automatically selected based on the information from the peripheral device. In addition, the peripheral device sends a command instructing whether you want to delete some data and send it, or whether you want to send data that is not deleted, and based on this command, the digital still camera sends some data. You may decide whether to delete.

The above embodiment is an example in which after the encoded data is generated in the arithmetic processing unit 7, the transmission order of the encoded data is rearranged based on the information of the peripheral device. An embodiment in which a method (encoding method) for generating encoded data in the arithmetic processing unit 7 is determined based on the information in 1 will be described with reference to FIG.

In this embodiment, first, when a digital still camera is used for photographing, in the signal processing section 6, the digital image signal for each pixel is divided into color components (R, G, B) as in the above embodiment. ) Is a luminance color difference signal (Y, C
b, Cr), and sent to the arithmetic processing unit 7 which is an image processing means.

Here, when the image signal is sent to the arithmetic processing section 7, the data transmission / reception interface section 10 causes the data transmission / reception with the external peripheral equipment such as a printer or a portable terminal before starting the data transmission / reception with the peripheral equipment. Is transmitted and received. In this embodiment, prior to the control unit 1 starting data transmission / reception with the peripheral device, type information of the peripheral device such as whether the peripheral device is a printer or a mobile terminal, and information such as the number of horizontal pixels and the number of vertical pixels that can be output. Trying to get. The information about the peripheral device may be acquired in advance before shooting.

Next, the control unit 1 determines an encoding method which is a convenient data format for the peripheral device based on the peripheral device type information which is the information acquired by the data transmission / reception interface unit 10. That is, the control unit 1
Data transmission / reception interface unit 1 which is a data communication means
It also includes a determining unit for determining the image data encoding method based on the peripheral device information acquired by 0.

In the arithmetic processing section 7 in this embodiment,
A plurality of different encoding methods are prepared as methods for encoding the image signal, and the image signal sent from the signal processing unit 6 is compressed based on one of the encoding methods determined by the control unit 1. To do.

The plurality of different encoding methods are different in the arrangement order of encoded data.
The arithmetic processing unit 7 performs encoding based on the arrangement order of encoded data in the encoding method determined by the control unit 1.
The determination of the arrangement order of the encoded data is performed by the operation processing unit 7 including at least a hierarchical encoding system and a sequential encoding system as the encoding system, and preferably, the control unit 1 uses the encoding system as the encoding system. It is decided to use either the hierarchical coding method or the sequential coding method. For example, in the control unit 1,
When it is determined that the peripheral device is a mobile terminal, the encoding system is determined to be a hierarchical encoding system, and when it is determined that the peripheral device is a printer, the encoding system is sequentially encoded. Determine the method.

Here, the image compression method by the hierarchical encoding method and the recording format of the compressed image data on the memory (external recording medium M) are as described in the above-mentioned embodiment, and here as well. Since the same operation can be performed, the description thereof will be omitted. The image compression method by the sequential encoding method and the recording format of the compressed image data on the memory will be described below.

When the image data as shown in FIG. 13A is compressed by the sequential encoding method, the head data of the image data of one image (the area "1" at the upper left of FIG. 13A). From the bottom, the last data (Fig. 13
The image data is compressed up to the "64" area at the lower right of (a), and the encoded data is recorded in the memory in the order in which the compression processing was performed (see FIG. 13B).

Further, in the case of the image data subjected to the wavelet transform, as described above, as shown in FIG. 8A, the resolution is sequentially increased from the image A having the smaller resolution to the images B and C. Image data corresponding to the acquired image is created, and A1, B1, B2, B5, B6 shown in FIG.
C1, C2, C3, C4, C9, C10, C11, C1
2, ..., C27, C28, A2, B3, B4, B7, B
8, C5, C6, ..., C63, C64 block order,
Encoding processing is performed from the upper left block to the lower right block of the image of each resolution, and the encoded data is recorded in the memory in that order.

As described above, when the image data is compressed by the sequential encoding method and the compressed image data is recorded in the memory and then the image is reproduced, the image data relating to the reproduced image is recorded. By reproducing the image data sequentially from the top area of the memory area, the reproduction can be started from the upper left pixel of the image with the image quality when the reproduction is completed, and the reproduction can be completed with the lower right pixel of the image. . That is, it is possible to generate optimum image data for a peripheral device such as a printer corresponding to such a reproducing method.

In this embodiment, when the control unit 1 determines that the encoding method is the hierarchical encoding method, it is also preferable to generate the resolution data according to the acquired information on the peripheral device. That is, when the displayable image size of the peripheral device is known from the type information of the peripheral device acquired from the data transmission / reception interface unit 10 by the control unit 1, a layer generated by the hierarchical encoding method is used. Data in which unnecessary high resolution data is deleted from the structural data is generated.

For example, when the peripheral device is a mobile terminal and the coding method is determined to be the hierarchical coding method in the control unit 1, the information of the peripheral device (mobile terminal) is displayed as shown in FIG. When the image C having a high resolution as shown cannot be displayed, as shown in FIG. 10, A1, A2, A3, A
4, B1, B2, ... B15, B16, and the like have a data format in which high-resolution image data (image data of the C surface) is deleted. This eliminates the waste of encoding image data of unnecessary resolution depending on the peripheral device,
It becomes possible to obtain efficient coded data according to the peripheral device, and also when transmitting the coded data to the peripheral device, the transmission time can be shortened and the data corresponding to the memory capacity of the receiving side can be obtained. Is transmitted, it is possible to avoid a situation in which reception is impossible.

FIG. 12 is a block diagram showing the configuration of the arithmetic processing unit 7 of the digital still camera according to still another embodiment. The same reference numerals as those in FIG. 2 indicate the same components, and detailed description thereof will be omitted here. Further, since the overall configuration of the digital still camera is the same as that in FIG. 1, detailed description will be omitted.

This embodiment is characterized in that the arithmetic processing section 7 is provided with a recompression processing section 7l as a recompression means for recompressing the coded data once generated.

First, as described above, the image signal input from the signal processing unit 6 to the arithmetic processing unit 7 (see FIG. 1) is a wavelet transform unit 7a, a quantizing unit 7c, a coefficient bit modeling unit 7d, an encoding unit. After 7e, the encoded data is output from the encoded data output section 7f to the external storage medium M via the external storage medium interface section 8.

Also in this embodiment, data is transmitted / received to / from external peripheral devices such as a printer and a portable terminal via the data transmission / reception interface unit 10.
Here, when the control unit 1 starts data transmission / reception with the peripheral device, the control unit 1 acquires the type information of the peripheral device connected to the data transmission / reception interface unit 10, for example, information such as a printer or a mobile terminal.

Next, the control section 1 reads the image compression file from the storage medium M via the external storage medium interface section 8 and inputs it to the encoded data input section 7g of the arithmetic processing section 7.

The coded data input to the coded data input unit 7g is temporarily stored in the buffer 7j and then, in the recompression processing unit 7l, based on the peripheral device type information acquired by the control unit 1. The encoded data is recompressed so that the data size is set in advance so as to correspond to the peripheral device.

For example, the recompression processing unit 7l first decodes all code blocks and restores all bit planes from MSB to LSB shown in FIG. next,
Discard the LSB bit plane and bit shift the upper bit plane. This processing is equivalent to performing the quantization processing on the wavelet transform coefficient.

The bit plane in which the above data is updated is coded by the coding unit 7e in the same manner as described above, and is image-compressed to the external storage medium M via the coded data output unit 7f and the external storage medium interface unit 8. It is recorded as a file. The file size to be generated can be adjusted by the bit shift amount, and is realized by repeating the bit shift processing and subsequent steps so as to obtain a desired data size.

According to this embodiment, recompression is executed even if the data size of the encoded data generated is too large depending on the peripheral device on the other side transmitting the encoded data. As a result, it becomes possible to generate and transmit coded data having an optimum size according to the peripheral device, which is extremely convenient.

In the digital still camera described above, the encoded data generated in the arithmetic processing unit 7 is stored in the removable external storage medium M via the external storage medium interface unit 8. It may be stored in an internal storage medium such as a built-in memory provided in the main body.

The hierarchical structure data described above may be of any type as long as the data structure is recognizable and reproducible between the respective models, but at the end of 2000, Standardized JPEG2000
If the image data conforms to the above format, the present invention can be more easily implemented.

The present invention is not limited to digital still cameras, but can be widely applied to electronic equipment having a configuration capable of generating encoded data and transmitting / receiving data to / from peripheral equipment.

[0082]

According to the present invention, it is possible to provide an electronic device and a digital still camera which are excellent in usability and which can transmit encoded data in a convenient format according to the peripheral device on the other side to which the data is transmitted. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a digital still camera.

FIG. 2 is a block diagram showing an embodiment of an arithmetic processing unit.

3A to 3D are explanatory views showing a state in which image data is decomposed into a plurality of subbands.

FIG. 4 is an explanatory diagram showing a filter configuration in wavelet transform.

FIG. 5 is an explanatory diagram showing a state in which image data is converted into a bit plane.

FIG. 6 is an explanatory diagram showing an example in which one sub block is divided into coding blocks.

FIG. 7 is a diagram showing an example of the configuration of an image file when sequentially expanding from a low resolution.

FIG. 8A is an example of an image in which the resolution is sequentially increased from a low resolution image, and FIG. 8B is an explanatory diagram showing a state of data compressed block by block in each image.

FIG. 9 is a diagram showing an example of the configuration of an image file when decompressing from the top of the image.

FIG. 10 is a diagram showing an example of the configuration of an image file when high-resolution data is deleted and sequentially expanded from low resolution.

FIG. 11 is a diagram showing an example of the configuration of an image file when high-resolution data is deleted and decompressed from the top of the image.

FIG. 12 is a block diagram showing another embodiment of an arithmetic processing unit.

13A is an explanatory diagram showing a case where image data is compressed by a sequential encoding method, and FIG. 13B is an explanatory diagram showing a state of the data.

FIG. 14A is a diagram showing coded data generated from image data based on a predetermined coding method, and the coded data is transmitted to the peripheral device based on the acquired peripheral device information. FIG. 2B is a diagram for explaining the invention in which the transmission order is rearranged, in which the information of the peripheral device is acquired in advance before the encoded data is obtained from the image data, and the image data is acquired based on the information of the peripheral device. Determine the encoding method of
The figure explaining the invention which produces | generates the encoding data from image data based on the determined encoding system.

[Explanation of symbols]

1: Control unit 2: Switch input section 3: Shooting optical system 4: Image sensor 5: A / D converter 6: Signal processing unit 7: Arithmetic processing unit 7a: Wavelet transform unit 7b: buffer 7c: quantizer 7d: Coefficient bit modeling section 7e: Encoding unit 7f: Encoded data output section 7g: Coded data input section 7h: Decompression processing unit 7i: Decompressed data output section 7j: buffer 7k: Encoded data converter 7l: Recompression processing unit 8: External storage medium interface section 9: Image display section 10: Data transmission / reception interface unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor, Wisdom Nemoto             2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica stock             Inside the company (72) Inventor Etsuko Rokutanda             2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica stock             Inside the company F-term (reference) 5C022 AA13 AB00                 5C059 MA24 PP01 PP16 RE07 SS15                       SS28 TA17 TB03 TC45 UA02                       UA06 UA12 UA14                 5C078 BA53 BA64 CA34 DA01 DA02                       EA00

Claims (25)

[Claims] 1. An image processing unit for compressing image data by encoding to obtain encoded data, a data communication unit for transmitting and receiving data to and from peripheral devices, and an image processing unit acquired by the data communication unit. Determining means for determining an encoding method of the image data based on information of peripheral devices, the image processing means, based on the encoding method determined by the determining means, the image data Is encoded to obtain the encoded data. 2. The determining means determines the arrangement order of the encoded data based on the information of the peripheral device, and the image processing means determines the arrangement order of the encoded data based on the determined arrangement order of the encoded data. The electronic device according to claim 1, wherein the image data is encoded. 3. The image processing means applies wavelet transform to image data to generate hierarchical structure data for each frequency band, divides the hierarchical structure data into a plurality of block areas, and encodes each block area. 3. The electronic device according to claim 2, wherein the image data is compressed by compressing the image data. 4. The electronic device according to claim 2, wherein the determining unit determines the coding method to be either a hierarchical coding method or a sequential coding method. 5. The image processing means, when the deciding means decides to use a hierarchical coding scheme as the coding scheme, generates data having a resolution according to information of the peripheral device. Item 4. The electronic device according to item 4. 6. An image pickup optical system, and image pickup means for obtaining image data by picking up an optical image formed by the image pickup optical system, wherein the image processing means is obtained by the image pickup means. The electronic device according to claim 1, wherein the image data is subjected to a wavelet transform. 7. An image pickup optical system, an image pickup unit for picking up an optical image formed by the image pickup optical system to obtain image data, and an image data obtained by the image pickup unit is encoded and compressed. An image processing unit that obtains encoded data, a data communication unit that transmits and receives data to and from a peripheral device, and an encoding method of the image data based on the peripheral device information acquired by the data communication unit. Determining means for determining, and the image processing means obtains the encoded data by encoding the image data based on the encoding method determined by the determining means. Digital still camera. 8. The determining means determines the arrangement order of the encoded data based on the information of the peripheral device, and the image processing means encodes the image data based on the arrangement order of the encoded data. The digital still camera according to claim 7, wherein the digital still camera is a digital still camera. 9. The image processing means performs wavelet transform on the image data to generate hierarchical structure data for each frequency band, divides the hierarchical structure data into a plurality of block areas, and encodes each block area. 9. The digital still camera according to claim 8, wherein the image data is compressed by compression. 10. The digital still camera according to claim 8, wherein said deciding means decides either the hierarchical coding system or the sequential coding system as the coding system. 11. The image processing means, when the determining means determines a hierarchical encoding method as the encoding method,
11. The digital still camera according to claim 10, wherein data having a resolution according to information on the peripheral device is generated. 12. An image processing unit for compressing image data by encoding to obtain encoded data, a data communication unit for transmitting and receiving data to and from a peripheral device, and an image processing unit obtained by the data communication unit. An electronic device, comprising: a data conversion unit that rearranges a transmission order of encoded data based on information of a peripheral device. 13. Image processing means for subjecting image data to wavelet transformation to generate hierarchical structure data for each frequency band, dividing this into a plurality of block areas, and encoding each block area to compress the image data. A data communication unit that transmits and receives data to and from the peripheral device; and a transmission order of the encoded data for each block area to the peripheral device based on the information of the peripheral device acquired by the data communication unit. An electronic device comprising: a data conversion unit for changing the data. 14. The electronic device according to claim 12, wherein the data conversion unit rearranges the image data having a smaller resolution into a format for sequentially transmitting the image data or a format for sequentially transmitting the image data. . 15. The data converting means, when sequentially transmitting the image data having a smaller resolution, selects the data having an unnecessarily high resolution among the image data according to the information of the peripheral device acquired by the data communication means. The electronic device according to claim 14, wherein the electronic device is deleted. 16. The electronic apparatus according to claim 15, further comprising warning means for warning that the image data has been deleted by the data conversion means. 17. An image processing unit for compressing image data by encoding to obtain encoded data, a data communication unit for transmitting and receiving data to and from a peripheral device, and an image processing unit obtained by the data communication unit. An electronic device, comprising: a recompression unit that recompresses the image data compressed by the image processing unit based on information of peripheral devices. 18. An image processing means for subjecting image data to wavelet transformation to generate hierarchical structure data for each frequency band, dividing this into a plurality of block areas, encoding each block area and compressing the image data. A data communication unit that transmits and receives data to and from the peripheral device; and a recompression unit that recompresses the image data compressed by the image processing unit based on the peripheral device information acquired by the data communication unit. An electronic device comprising: 19. An image pickup optical system, an image pickup unit for picking up an optical image formed by the image pickup optical system to obtain image data, and image data captured by the image pickup unit is encoded and compressed. , An image processing unit for obtaining encoded data, a data communication unit for transmitting and receiving data to and from a peripheral device, and a transmission order of the encoded data based on the information of the peripheral device acquired by the data communication unit. A digital still camera having a data conversion means for rearranging. 20. An image pickup optical system, an image pickup means for picking up an optical image formed by the image pickup optical system to obtain image data, and a wavelet transform for image data taken in by the image pickup means to obtain a frequency band. An image processing unit that generates hierarchical structure data for each, divides this into a plurality of block areas, encodes each block area to compress the image data, and a data communication unit that transmits and receives data between peripheral devices. And a data conversion unit that rearranges the transmission order of the encoded data for each block area to the peripheral device based on the peripheral device information acquired by the data communication unit. . 21. The digital still according to claim 19, wherein the data converting means rearranges the image data having a smaller resolution into a format for sequentially transmitting the image data or a format for sequentially transmitting the image data. camera. 22. The data converting means, when sequentially transmitting the image data having a smaller resolution, selects the data having an unnecessarily high resolution among the image data according to the information of the peripheral device acquired by the data communication means. The digital still camera according to claim 21, wherein the digital still camera is deleted. 23. A digital still camera according to claim 22, further comprising warning means for warning that the image data has been deleted by the data converting means. 24. An image pickup optical system, an image pickup unit for picking up an optical image formed by the image pickup optical system to obtain image data, and image data captured by the image pickup unit is encoded and compressed. An image processing unit that obtains encoded data, a data communication unit that transmits and receives data to and from a peripheral device, and an image processing unit that compresses the image data based on the information about the peripheral device acquired by the data communication unit. And a recompression means for recompressing the image data. 25. An image pickup optical system, an image pickup unit for picking up an optical image formed by the image pickup optical system to obtain image data, and a wavelet transform for the image data taken in by the image pickup unit to obtain a frequency band. An image processing unit that generates hierarchical structure data for each, divides this into a plurality of block areas, encodes each block area to compress the image data, and a data communication unit that transmits and receives data between peripheral devices. And a recompression unit for recompressing the image data compressed by the image processing unit based on the peripheral device information acquired by the data communication unit.