JP3344875B2 - Image processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a bit plane by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and forms a bit plane for each bit plane. An image processing device that performs a binary encoding process and encodes and compresses an original image;
A bit plane formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image consisting of multiple bits per pixel, and encoding obtained by performing binary encoding processing for each bit plane An image processing apparatus for decoding the image data of the original image based on the data, and a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel. An image processing apparatus that forms a bit plane by extracting bit data of the same bit order for each pixel for each color component, performs a binary encoding process for each bit plane, and encodes and compresses the original image, and From a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel, for each color component, On the basis ax each bit plane of the binary coding processing to encoded data obtained, the image processing apparatus for decoding the image data of the original image, and,
From a monochrome multi-tone image consisting of multiple bits per pixel,
A bit plane is formed by extracting the bit data of the same bit order for each pixel, and a binary encoding process is performed for each bit plane to encode and compress the original image. An image processing device having a transmission function of transmitting value-encoded data to a partner terminal; and a color multi-tone image including a plurality of color components and one color component including a plurality of bits per pixel. For a color component, a bit plane is formed by extracting bit data of the same bit order for each pixel, a binary encoding process is performed for each bit plane, and the original image is encoded and compressed. The present invention relates to an image processing apparatus having a transmission function of transmitting the binary coded data to a partner terminal.

[0002]

2. Description of the Related Art In recent years, with the diversification of data communication and data processing, for example, as a document to be exchanged by a facsimile device or processed by a personal computer device, a monochrome multi-gradation comprising a plurality of bits per pixel is used. There is a demand for using an image or a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel.

Here, as is well known, since the data amount of image data is very large, if the data is processed as it is, for example, the capacity of a storage device required for storage becomes enormous, Since the time required for data processing becomes excessively long, usually, data communication is performed or accumulated in a state where image data is encoded and compressed to reduce the data amount. In particular, since a black-and-white multi-tone image and a color multi-tone image have a large number of bits per pixel, an encoding method capable of encoding and compressing with higher efficiency is required.

For example, when encoding and compressing a black-and-white multi-tone image, an encoding method (so-called JPEG method) in which a plurality of bits per pixel is handled as it is.
A so-called bit plane in which bit data of the same bit order in a monochrome multi-tone image is extracted for each pixel to form a bit plane, and a binary encoding process is performed for each bit plane to encode and compress the original image. There are two types of encoding methods. In the latter encoding method, an appropriate binary image encoding method, for example, an MH method, an MR method, an MMR method, a JBIG method, or the like is adopted as a binary encoding process.

Here, in the former coding method described above,
Because it is a so-called lossy encoding method that partially reduces the information amount of the original image to the extent that the image quality is not impaired using human visual characteristics, the character image in the reproduced image is blurred, or if the encoding compression ratio is increased, There is a situation that the image quality of the reproduced image is extremely deteriorated, and in the latter encoding method, the encoding compression rate when encoding and compressing a monochrome multi-tone image is slightly inferior to the former encoding method. There are circumstances.

[0006]

[0005] Now, when trying to distribute image information formed by compressing an image of a predetermined size (length and width dimensions) using, for example, an exchangeable storage medium such as a floppy disk, etc. , Floppy disk 1
It is preferable that the number of pieces of image information that can be stored per sheet can be specified to some extent.

For example, when the latter encoding method is used for such an application, the following inconvenience occurs.

That is, in the binary image encoding method adopted in the latter encoding method, encoding is performed using a variable-length code, so that the amount of code data per image is:
Because the image fluctuates considerably depending on the complexity of the image, etc., the number of images that can be accommodated per floppy disk greatly fluctuates depending on the content of the image. Occurs.

The present invention has been made in view of the above circumstances, and provides an image processing apparatus capable of limiting the amount of code data when encoding and compressing a black-and-white multi-tone image or a color multi-tone image. It is intended to be. It is another object of the present invention to provide an image processing apparatus capable of forming an original image by appropriately processing code data having such a limited data amount. It is another object of the present invention to provide an image processing apparatus capable of limiting the data amount of transmission image information to the limited data amount when the data amount that can be handled by the partner terminal is limited in image communication.

[0010]

According to the present invention, a bit plane is formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel. In an image processing apparatus that performs a binary coding process for each time and encodes and compresses an original image, the data of the bit plane is binary-coded in bit plane units from the bit plane of the most significant bit to the bit plane of the lower bit. Bit plane encoding means for encoding and outputting binary encoded data, and the total data amount in bit plane units calculated in the output order of the binary encoded data output from the bit plane encoding means are predetermined. Code amount control means for limiting the code amount within the range.

Further, a bit plane is formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and a binary encoding process is performed for each bit plane. In an image processing apparatus that encodes and compresses an original image, the data of the bit plane is binary-coded from A bit plane encoding means for outputting the bit plane encoding means, and the total data amount per bit plane calculated in the output order of the binary encoded data output from the bit plane encoding means is limited to within a predetermined value, A code amount system for adding information indicating the number of bits per pixel of the original image to the head of the binary coded data It is those with the means.

Also, a bit plane is formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and a binary encoding process is performed for each bit plane. In an image processing apparatus that encodes and compresses an original image, the bit plane data is binary-coded in bit plane units from the highest-order bit plane to the lower-order bit plane, so that , A data amount limit value input means for inputting a data amount limit value of the binary encoded data, and an output of the binary encoded data output from the bit plane encoding means. A code for limiting the total data amount in bit plane units calculated in order within the limit value input from the data amount limit value input means. Those having a quantity control means.

Further, a bit plane is formed by extracting bit data of the same bit order for each pixel from a black and white multi-tone image composed of a plurality of bits per pixel. In an image processing apparatus that encodes and compresses an original image, the data of the bit plane is binary-coded from , A data amount limit value input means for inputting a data amount limit value of the binary encoded data, and an output of the binary encoded data output from the bit plane encoding means. When the total data amount in the bit plane unit calculated in order is limited within the limit value input from the data amount limit value input means, Moni, those having a code amount control means for adding the information representing the number of bits per pixel of the top on the original image of the binary coded data.

Further, a bit plane is formed by extracting bit data of the same bit order for each pixel from a black and white multi-tone image composed of a plurality of bits per pixel, and a binary encoding process is performed for each bit plane. In the image processing apparatus for decoding the image data of the original image based on the coded data obtained in the above, the binary coded data for each bit plane is decoded and the bit planes of a predetermined number of bit planes are decoded. Bit plane decoding means for forming a unit of image data; and bit plane image data of lower-order bits which could not be decoded normally among bit plane unit decoded image data output from the bit plane decoding means. Inserting image data generating means for generating interpolated image data for interpolating Bit plane data generating means for forming image data of an original image based on the decoded image data normally decoded and output from the stage and the interpolated image data output from the inserted image data generating means. Things.

A bit plane is formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and a binary encoding process is performed for each bit plane. In the image processing apparatus for decoding the image data of the original image based on the coded data obtained in the above, a bit plane for decoding the binary coded data for each bit plane to form image data in a bit plane unit Decoding means, among the bit-plane-unit decoded image data output from the bit-plane decoding means, image data of bit planes of lower bits that could not be decoded normally, and
The difference between the number of bit planes corresponding to the information representing the number of bits per pixel of the original image added to the head of the binary coded data and the number of bit planes normally decoded by the bit plane decoding means , Inserted image data generating means for generating image data of lower bits corresponding to the number of bit planes, decoded image data output from the bit plane decoding means, and image output from the inserted image data generating means. It is provided with bit plane data generating means for forming image data of an original image based on the data.

In addition, a plurality of color components and one
A bit plane is formed by extracting bit data of the same bit order for each color component for each pixel from a color multi-tone image in which one color component consists of a plurality of bits per pixel, and two bit planes are formed for each bit plane. In an image processing apparatus that performs value encoding processing and encodes and compresses an original image, for each color component, the data of the bit plane is shifted from the bit plane of the most significant bit to the bit plane of the lower bit in bit plane units. A bit plane encoding means for binary encoding and outputting binary encoded data, and a bit plane unit calculated for each color component in the output order of the binary encoded data outputted from the bit plane encoding means. With code amount control means for limiting the total data amount of A.

In addition, a plurality of color components
A bit plane is formed by extracting bit data of the same bit order for each color component for each pixel from a color multi-tone image in which one color component consists of a plurality of bits per pixel, and two bit planes are formed for each bit plane. In an image processing apparatus that performs value encoding processing and encodes and compresses an original image, for each color component, the data of the bit plane is shifted from the bit plane of the most significant bit to the bit plane of the lower bit in bit plane units. A plurality of bit plane encoding means for binary encoding and outputting binary encoded data, and for each color component,
A plurality of code amount control means for limiting the total data amount per bit plane calculated in the output order of the binary coded data output from the plurality of bit plane coding means to a predetermined value or less. Things.

In addition, while being composed of a plurality of color components,
A bit plane is formed by extracting bit data having the same bit order for each color component for each pixel from a color multi-tone image in which one color component is composed of a plurality of bits per pixel, and two bit planes are formed for each bit plane. In an image processing apparatus that performs value encoding processing and encodes and compresses an original image, for each color component, the data of the bit plane is shifted from the bit plane of the most significant bit to the bit plane of the lower bit in bit plane units. A bit plane encoding unit that outputs binary encoded data by binary encoding, and a bit plane unit calculated for each color component in the output order of the binary encoded data output from the bit plane encoding unit. Limits the total amount of data within a predetermined value,
A code amount control means for adding information indicating the number of color components and the number of bits per pixel is provided at the head of the binary coded data.

In addition, while being composed of a plurality of color components,
A bit plane is formed by extracting bit data of the same bit order for each color component for each pixel from a color multi-tone image in which one color component consists of a plurality of bits per pixel, and two bit planes are formed for each bit plane. In an image processing apparatus that performs value encoding processing and encodes and compresses an original image, for each color component, the data of the bit plane is shifted from the bit plane of the most significant bit to the bit plane of the lower bit in bit plane units. A plurality of bit plane encoding means for binary encoding and outputting binary encoded data, and for each color component,
The total data amount per bit plane calculated in the output order of the binary encoded data output from the plurality of bit plane encoding means is limited to a predetermined value or less, and the binary encoded data At the beginning,
It comprises a plurality of code amount control means for adding information indicating the number of color components and the number of bits per pixel.

In addition, while being composed of a plurality of color components,
A bit plane is formed by extracting bit data of the same bit order for each color component for each pixel from a color multi-tone image in which one color component consists of a plurality of bits per pixel, and two bit planes are formed for each bit plane. In an image processing apparatus that performs value encoding processing and encodes and compresses an original image, for each color component, the data of the bit plane is shifted from the bit plane of the most significant bit to the bit plane of the lower bit in bit plane units. Bit plane encoding means for binary encoding and outputting binary encoded data, data amount limit value input means for inputting a data amount limit value of the binary encoded data, and for each color component, The total of the bit plane units calculated in the output order of the binary coded data output from the bit plane coding means. The chromatography data amount, those having a code amount control means for limiting the limit value input from the data amount limiting value input means.

In addition, while being composed of a plurality of color components,
A bit plane is formed by extracting bit data of the same bit order for each color component for each pixel from a color multi-tone image in which one color component consists of a plurality of bits per pixel, and two bit planes are formed for each bit plane. In an image processing apparatus that performs value encoding processing and encodes and compresses an original image, for each color component, the data of the bit plane is shifted from the bit plane of the most significant bit to the bit plane of the lower bit in bit plane units. Bit plane encoding means for binary encoding and outputting binary encoded data, data amount limit value input means for inputting a data amount limit value of the binary encoded data, and for each color component, The total of the bit plane units calculated in the output order of the binary coded data output from the bit plane coding means. Data amount within the limit value input from the data amount limit value input means, and information indicating the number of color components and the number of bits per pixel at the beginning of the binary coded data. It is provided with a code amount control means to be added.

In addition, while being composed of a plurality of color components,
From a color multi-tone image in which one color component consists of a plurality of bits per pixel, for each color component, based on coded data obtained by performing a binary coding process for each bit plane, In an image processing device that decodes image data, a bit plane decoding unit that decodes the binary coded data for each bit plane to form image data in units of bit planes of a predetermined number of bit planes, Inserted image data generating means for generating interpolated image data for interpolating bit plane image data of lower bits that could not be decoded normally among bit plane unit decoded image data output from the bit plane decoding means. And decoded image data that is normally decoded and output from the bit plane decoding unit. Bit plane data generating means for forming image data of each color component based on the interpolated image data output from the insertion image data generating means, and an image of each color component output from the bit plane data generating means It is provided with image data conversion output means for forming image data of an original image based on the data.

In addition, while being composed of a plurality of color components,
From a color multi-tone image in which one color component consists of a plurality of bits per pixel, for each color component, based on coded data obtained by performing a binary coding process for each bit plane, In an image processing device for decoding image data, bit plane decoding means for decoding the binary coded data for each bit plane to form image data in bit plane units, and output from the bit plane decoding means. Out of the decoded image data in units of bit planes, the image data of the bit plane of the lower bit that could not be decoded normally, and the image data per pixel of the original image added to the head of the binary coded data. The number of bit planes corresponding to the information representing the number of bits and the bit planes normally decoded by the bit plane decoding means. Image data generating means for generating image data of lower bits corresponding to the number of bit planes corresponding to the number of bit planes, decoded image data output from the bit plane decoding means, and the inserted image data generating means Bit plane data generating means for forming image data of each color component based on the image data output from the image processing apparatus; and the two-dimensional image processing apparatus based on the image data of each color component output from the bit plane data generating means. It is provided with image data conversion output means for forming image data of an original image corresponding to the number of color components added to the head of the value encoded data.

Further, as the inserted image data generating means, means for generating image data composed of pseudo random data can be used.

A bit plane is formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and is subjected to a binary encoding process for each bit plane. In the image processing apparatus having the transmission function of transmitting the binary coded data to the destination terminal by a predetermined transmission procedure while encoding and compressing the original image, the data of the bit plane is converted into the most significant bit. Bit plane encoding means for performing binary encoding on a bit plane basis and outputting binary encoded data from a plane to a bit plane of lower bits, and binary encoded data output from the bit plane encoding means; Of the total data amount per bit plane calculated in the output order of Those having a code amount control means for limiting within.

In addition, while being composed of a plurality of color components,
A bit plane is formed by extracting bit data of the same bit order for each color component for each pixel from a color multi-tone image in which one color component is composed of a plurality of bits per pixel. In the image processing apparatus having the transmission function of transmitting the binary coded data to the partner terminal by a predetermined transmission procedure while performing the value encoding process and encoding and compressing the original image, for each color component, Bit plane encoding means for binary encoding the bit plane data from the most significant bit plane to the lower bit plane and outputting binary encoded data in units of bit planes, and each color component , The bit map calculated in the output order of the binary coded data output from the bit plane coding means. The total data amount of over down units, those having a code amount control means for limiting within limit value notified from the destination terminal by a predetermined pre-transmission procedure.

[0027]

Therefore, the data amount of the code data when the monochrome multi-tone image or the color multi-tone image is encoded and compressed can be limited to a predetermined value or a value specified from the outside. Therefore, for example, handling of code data at the time of image distribution becomes easy.

Further, since the original black-and-white multi-tone image or color multi-tone image can be restored from the code data whose data amount is limited, such code data can be appropriately handled.

In the image communication, when the data amount that can be handled by the partner terminal is limited, the data amount of the transmission image information of the monochrome multi-tone image or the color multi-tone image can be limited to the limited data amount. In addition, image communication of a monochrome multi-tone image or a color multi-tone image can be efficiently performed.

Further, since the data amount is limited from the most significant bit plane to the lower bit plane, the upper bit which carries a larger amount of information for a monochrome multi-tone image or a color multi-tone image. Bit plane code data is always included, and as a result, even if the lower-order bit plane deleted due to the data amount limitation is generated as random data, for example,
The quality of the reproduced image is quite good.

[0031]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a coding apparatus for a monochrome multi-tone image according to an embodiment of the present invention. in this case,
The black-and-white multi-tone image to be encoded has 8 bits per pixel.

In FIG. 3, black and white multi-tone image data PX
Are added to the bit plane generation unit 1. The bit plane generation unit 1 extracts the eighth bit data for each pixel of the black-and-white multi-tone image data PX to form eighth bit data (hereinafter referred to as eighth bit plane data). The eighth bit plane data is output to the bit plane encoding unit 2, and then the seventh bit data is extracted to form seventh bit plane data (hereinafter, referred to as seventh bit plane data). The bit plane data is output to the bit plane encoding unit 2. Then, the sixth bit data is extracted to form the sixth bit plane data (hereinafter referred to as the sixth bit plane data), and the sixth bit plane is generated. The data is output to the bit plane encoding unit 2, and then the data of the fifth bit is extracted and , And outputs the fifth bit plane data to the bit plane encoding unit 2. Then, the fourth bit data is extracted and the fourth bit data is extracted. It forms plane data (hereinafter, referred to as fourth bit plane data), outputs the fourth bit plane data to the bit plane encoding unit 2, and then extracts third bit data to extract third bit bit plane data. (Hereinafter, referred to as third bit plane data), and outputs the third bit plane data to the bit plane encoding unit 2. Next, the second bit data is extracted and the second bit plane data (hereinafter, referred to as third bit plane data) is extracted. , Second bit plane data), and the second bit plane data is bit-played. Output to down coder 2,
Next, the first bit data is extracted to form first bit plane data (hereinafter, referred to as first bit plane data), and the first bit plane data is output to the bit plane encoding unit 2. With it,
The bit depth data Sn indicating the number of bits per bit in the black and white multi-tone image data PX is output to the code amount control unit 3.

Upon receiving the eighth bit plane data, the bit plane encoding unit 2 applies a predetermined binary image encoding method to the eighth bit plane data, and generates the encoded data of the eighth bit plane ( (Hereinafter, referred to as an eighth bit plane code data) to the code amount control unit 3 and, when the seventh bit plane data is input, a predetermined binary image coding method is applied to the seventh bit plane data, thereby forming the seventh bit plane data. The encoded data of the seventh bit plane (hereinafter, referred to as the seventh bit plane encoded data) is output to the code amount control unit 3 and the sixth bit plane data is input. Code data of the sixth bit plane formed by applying the When code data is output to the code amount control unit 3 and the fifth bit plane data is input, a predetermined binary image coding method is applied to the fifth bit plane data, and the fifth bit plane When code data (hereinafter, referred to as fifth bit plane code data) is output to the code amount control unit 3 and the fourth bit plane data is input, a predetermined binary image coding method is applied to the fourth bit plane data, The code data of the fourth bit plane formed thereby (hereinafter, referred to as fourth bit plane code data) is output to the code amount control unit 3, and when the third bit plane data is input, a predetermined number of bits of the third bit plane data are determined. Value image coding method is applied, and code data of a third bit plane formed thereby (hereinafter, third bit plane) When the second bit plane data is input, a predetermined binary image coding method is applied to the second bit plane data, and the second bit plane formed by the second bit plane data is generated. Is output to the code amount control unit 3 and the first bit plane data is input, a predetermined binary image coding method is applied to the first bit plane data. The first bit plane code data (hereinafter, referred to as first bit plane code data) formed thereby is output to the code amount control unit 3.

As shown in FIG. 2, the code amount control unit 3 adds the value n of the bit depth data Sn to the beginning, and outputs the eighth bit plane encoded data sequentially input from the bit plane encoding unit 2. To sequentially output the first bit plane encoded data as encoded data PD;
When the output encoded data PD reaches a preset data amount, the output of the input bit plane encoded data is stopped, and the end code E of a predetermined bit pattern indicating the end of the encoded data PD is changed. Add
The output of the encoded data PD ends.

Accordingly, at this time, the bit plane coded data of the lower bit plane of the portion exceeding the set data amount is not output as the code data PD, so that the data amount of the code data PD is limited to the set data amount. You.

FIG. 3 shows an example of a decoding device for forming original image data based on the code data PD.

In the figure, a bit plane decoding unit 4
Extracts the value n added to the head of the input code data PD, outputs the value n as bit depth data SS to the bit plane data generation unit 5, and outputs the eighth bit plane code data and the seventh bit .. Are sequentially decoded, and the image data obtained by the decoding is output to the bit plane data creation unit 5. The bit plane code data of the last bit plane of the code data PD may end in the middle of one image and have an end code E added thereto. Up to this point, the image data is output to the bit plane data generator 5 and the decoding error is notified to the bit plane data generator 5.

When the complete bit plane image data is input from the bit plane decoding unit 4, the bit plane data creation unit 5 outputs the image data to the image data output unit 7 as the bit plane image data. With respect to the bit plane for which the decoding error has been notified, the insertion data generated from the insertion data generation unit 6 is arranged as the image data of the portion where the image data has not been obtained, and the image data of one bit plane is completed. And outputs the completed image data to the image data output unit 7 as image data of the bit plane. Further, the bit plane data generation unit 5 generates one image data from the insertion data generation unit 6 for the bit plane image data not output from the bit plane decoding unit 4, and divides the generated image data. , As image data of each bit plane, the image data output unit 7
Output to

The insertion data generator 6 generates random data of the number of bits specified by the bit plane data generator 5 (random pattern data of "1" and "0"), and outputs the output data. Are added to the bit plane data creation unit 5.

The image data output unit 7 forms black and white multi-tone image data based on the image data of each bit plane output from the bit plane data creation unit 5, and decodes the formed image data PXr. The image data is output to the next-stage device as black-and-white multi-tone image data.

FIG. 4 shows a processing example of the code amount control section 3 of the encoding apparatus shown in FIG.

First, after outputting the value n of the data depth data Sn in a form of being added to the head of the code data PD (processing 1
01), one unit of data is input from the bit plane encoding unit 2 (process 102), and the input data amount is accumulated (process 103).

Then, it is checked whether or not the accumulated value is equal to or greater than a predetermined value KA (decision 104). If the result of decision 104 is NO, one unit of data input at that time is encoded data PD (Process 10
5) Returning to the processing 102, the remaining data is input / output.

When the result of the determination 104 is YES, the data amount of the output code data PD has reached the limit data amount. At this time, a predetermined end code E is output (process 106). The processing for one monochrome multi-tone image is completed.

FIG. 5 shows a processing example of the bit pattern data creating section 5 of the decoding apparatus shown in FIG.

First, a counter LP for storing the number of processed bit planes is initialized to 0 (step 20).
1) Until the end of decoding of one bit plane is notified from the bit plane decoding unit 4, the data output from the bit plane decoding unit 4 is sequentially input (process 202, NO loop of judgment 203). .

When the end of decoding is notified from the bit plane decoding unit 4 and the result of the judgment 203 is YES, the value of the counter LP is increased by one (process 204). It is checked whether or not it has been notified that the decoding process has been completed normally (decision 205).

If the bit plane decoding unit 4 has not notified that the decoding process has been abnormally terminated, and if the result of the judgment 205 is YES, the bit plane The image data is output to the image data output unit 7 as image data of the (n- (LP-1))-th bit plane (process 206). Then, it is checked whether or not the value of the counter LP is equal to or more than n (decision 207). When the result of the decision 207 is NO, the process returns to the process 202 for processing the image data of the next bit plane. Also, the result of judgment 207 is YE
At S, the decoding process for one image has been completed, and the operation is terminated.

If the bit plane decoding unit 4 notifies that the decoding process has been abnormally terminated, and if the result of the judgment 205 is NO, one bit input at that time is output. Of the plane image data, the remaining data is generated by the insertion data generation unit 6 to complete the image data of one bit plane (process 208), and the image data is converted to the (n- (LP-
1)) Output to the image data output unit 7 as bit plane image data (process 209).

Then, it is checked whether or not the value of the counter LP is equal to or more than n (decision 210). When the result of the decision 210 is NO, the bit planes thereafter are not included in the code data. The data of one bit plane is generated and input by the insertion data generator 6 (process 211), the value of the counter LP is increased by one (process 212), and the generated image data is sent to the (n
-(LP-1)) As bit plane image data,
The image data is output to the image data output unit 7 (processing 213), and the process returns to the determination 210 to check whether or not the processing of all the bit planes has been completed.

When the result of determination 210 is YES, the decoding process for one image has been completed, and the operation is terminated.

As described above, in this embodiment, the code data P
Since the data amount of D is limited to the set value, for example,
Handling of code data at the time of image distribution becomes easy.

Since the data amount of the code data is limited from the bit plane of the most significant bit to the bit plane of the lower bit, the bit plane of the upper bit which carries a larger amount of information for the monochrome multi-tone image Code data is always included, and as a result, the bit plane of the lower bits deleted due to the data amount limitation, for example,
Even when it is generated as random data, the quality of the reproduced image is quite good.

FIG. 6 shows an example of a color multi-tone image coding apparatus according to another embodiment of the present invention. In this case, the color multi-tone image to be encoded is RG
It has color components of B3 primary color, and each color component is 1
It has a bit depth of 8 bits per pixel.

In the figure, 24-bit color multi-tone image data CP is applied to a color component separation section 10. The color component separation unit 10 outputs the color multi-tone image data CP.
Are converted into 8-bit R-component R multi-gradation image data CPr, 8-bit G-component G multi-gradation image data CPg, and 8
It is to be decomposed into B multi-gradation image data CPb of bit B component, and R multi-gradation image data CPr, G multi-gradation image data CPg, and B multi-gradation image data CPb are
Bit plane generators 12r, 12g, 12b respectively
Has been added to Further, the color component separation unit 10 outputs to the code output unit 11 color related information SSa indicating the number m of color components in the color multi-tone image data CP and the bit depth n per pixel for each color component. I have.

The bit plane generation unit 12r extracts the eighth bit data for each pixel of the R multi-gradation image data CPr to form eighth bit plane data, and encodes the eighth bit plane data into a bit plane code. To the encoding unit 13r, and then extracts the seventh bit data to form seventh bit plane data, and encodes the seventh bit plane data into the bit plane encoding unit 13r.
r, and then extracts the sixth bit data to form sixth bit plane data, outputs the sixth bit plane data to the bit plane encoding unit 13r, and then extracts the fifth bit data. To form the fifth bit plane data and output the fifth bit plane data to the bit plane encoding unit 13r. Then, the fourth bit data is extracted to form the fourth bit plane data and the fourth bit plane data is formed. The plane data is output to the bit plane encoding unit 13r, then the third bit data is extracted to form third bit plane data, and the third bit plane data is output to the bit plane encoding unit 13r. , Extracting the second bit data to form second bit plane data, and forming the second bit plane Outputs over data to the bit-plane coding unit 2, then, it outputs the first bit plane data into bit plane coding unit 13r to form the first bit plane data by extracting first bit of data.

Upon receiving the eighth bit plane data, the bit plane encoding unit 13r applies a predetermined binary image encoding method to the eighth bit plane data, and encodes the eighth bit plane encoded data formed thereby. When the data is output to the amount control unit 14r and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane coded data formed thereby is encoded by the code amount control unit. 14r, and when the sixth bit plane data is input, the sixth
A predetermined binary image coding method is applied to the bit plane data, and the sixth bit plane code data formed by the application is output to the code amount control unit 14r. When the fifth bit plane data is input, the fifth bit plane data is input. , A predetermined binary image coding method is applied, the fifth bit plane code data formed thereby is output to the code amount control unit 14r, and the fourth bit plane data is input. Applying a binary image coding scheme, the fourth
When the bit plane code data is output to the code amount control unit 14r and the third bit plane data is input, a predetermined binary image coding method is applied to the third bit plane data, and the third bit plane code formed thereby is formed. When the data is output to the code amount control unit 14r and the second bit plane data is input, a predetermined binary image encoding method is applied to the second bit plane data, and the second bit plane code data formed thereby is encoded. When the first bit plane data is output to the amount control unit 14r and the first bit plane data is input, a predetermined binary image encoding method is applied to the first bit plane data, and the first bit plane code data formed thereby is converted into the code amount control unit. 14r.

The code amount control unit 14r sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding unit 13r as encoded data, and outputs the encoded data. When the coded data reaches a preset data amount, the output of the input bit plane coded data is stopped, and an end code E of a predetermined bit pattern representing the end of the coded data is added, and The output of the data is terminated, and the code data is output to the code output unit 11.
Has been added to

The bit plane generation unit 12g extracts the eighth bit data for each pixel of the G multi-tone image data CPg to form eighth bit plane data, and encodes the eighth bit plane data into a bit plane code. Output to the encoding unit 13g, and then extracts the seventh bit data to form seventh bit plane data, and encodes the seventh bit plane data into the bit plane encoding unit 13g.
g, and then extracts the sixth bit data to form sixth bit plane data, outputs the sixth bit plane data to the bit plane encoding unit 13g, and then extracts the fifth bit data. To generate the fifth bit plane data and output the fifth bit plane data to the bit plane encoding unit 13g. Then, the fourth bit data is extracted to form the fourth bit plane data and the fourth bit plane data is formed. The plane data is output to the bit plane encoding unit 13g, the third bit data is extracted to form third bit plane data, and the third bit plane data is output to the bit plane encoding unit 13g. , The second bit data is extracted to form second bit plane data, and the second bit plane Outputs over data to the bit-plane coding unit 2, then, it outputs the first bit plane data into bit plane coding unit 13g to form a first bit plane data by extracting first bit of data.

Upon receiving the eighth bit plane data, the bit plane encoding unit 13g applies a predetermined binary image encoding method to the eighth bit plane data, and encodes the eighth bit plane encoded data formed thereby. When the data is output to the amount control unit 14g and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane code data formed thereby is encoded by the code amount control unit. 14g, and the sixth bit plane data is input.
A predetermined binary image coding method is applied to the bit plane data, the sixth bit plane code data formed by the predetermined method is output to the code amount control unit 14g, and the fifth bit plane data is input. Is applied to the code amount control unit 14g, and when the fourth bit plane data is inputted, a predetermined binary image coding method is applied to the fourth bit plane data. Applying a binary image coding scheme and forming the fourth
When the bit plane code data is output to the code amount control unit 14g and the third bit plane data is input, a predetermined binary image coding method is applied to the third bit plane data, and the third bit plane code formed thereby is applied. When the data is output to the code amount control unit 14g and the second bit plane data is input, a predetermined binary image encoding method is applied to the second bit plane data, and the second bit plane code data formed thereby is encoded. When the first bit plane data is output to the amount control unit 14g and the first bit plane data is input, a predetermined binary image coding method is applied to the first bit plane data, and the first bit plane code data formed thereby is encoded by the code amount control unit. Output to 14g.

The code amount control unit 14g sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding unit 13g as encoded data, and outputs the encoded data. When the coded data reaches a preset data amount, the output of the input bit plane coded data is stopped, and an end code E of a predetermined bit pattern representing the end of the coded data is added, and The output of the data is terminated, and the code data is output to the code output unit 11.
Has been added to

The bit plane generating section 12b extracts the eighth bit data for each pixel of the B multi-gradation image data CPb to form eighth bit plane data, and encodes the eighth bit plane data into a bit plane code. And outputs the seventh bit data to form a seventh bit plane data. The seventh bit plane data is output to the bit plane encoding unit 13b.
b, and then extracts the sixth bit data to form sixth bit plane data, outputs the sixth bit plane data to the bit plane encoding unit 13b, and then extracts the fifth bit data. To form the fifth bit plane data and output the fifth bit plane data to the bit plane encoding unit 13b, and then extract the fourth bit data to form the fourth bit plane data and generate the fourth bit plane data. The plane data is output to the bit plane encoding unit 13b, then the third bit data is extracted to form third bit plane data, and the third bit plane data is output to the bit plane encoding unit 13b. , The second bit data is extracted to form second bit plane data, and the second bit plane Outputs over data to the bit-plane coding unit 2, then, it outputs the first bit plane data into bit plane coding unit 13b to form a first bit plane data by extracting first bit of data.

Upon receiving the eighth bit plane data, the bit plane encoding unit 13b applies a predetermined binary image encoding method to the eighth bit plane data, and encodes the eighth bit plane encoded data formed thereby. When the data is output to the amount control unit 14b and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane code data formed thereby is encoded by the code amount control unit. 14b, and the sixth bit plane data is input.
A predetermined binary image encoding method is applied to the bit plane data, the sixth bit plane code data formed by the predetermined binary image coding method is output to the code amount control unit 14b, and the fifth bit plane data is input. , A predetermined binary image encoding method is applied, the fifth bit plane code data formed thereby is output to the code amount control unit 14b, and the fourth bit plane data is input. Applying a binary image coding scheme, the fourth
When the bit plane code data is output to the code amount control unit 14b and the third bit plane data is input, a predetermined binary image coding method is applied to the third bit plane data, and the third bit plane code formed thereby is applied. When the data is output to the code amount control unit 14b and the second bit plane data is input, a predetermined binary image encoding method is applied to the second bit plane data, and the second bit plane code data formed thereby is encoded. When the first bit plane data is output to the amount control unit 14b and the first bit plane data is input, a predetermined binary image coding method is applied to the first bit plane data, and the first bit plane code data formed thereby is encoded by the code amount control unit. 14b.

The code amount control unit 14b sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding unit 13b as encoded data, and outputs the encoded data. When the coded data reaches a preset data amount, the output of the input bit plane coded data is stopped, and an end code E of a predetermined bit pattern representing the end of the coded data is added, and The output of the data is terminated, and the code data is output to the code output unit 11.
Has been added to

As shown in FIG. 7A, the code output unit 11 adds the value of the number m of color components and the value of the bit depth n to the head, and outputs the R output from the code amount control unit 14r. The color code data CD in which the component code data, the G component code data output from the code amount control unit 14g, and the B component code data output from the code amount control unit 14b are sequentially arranged is output. As shown in FIG. 2B, the coded data of each color component is arranged in order from the eighth bit plane coded data to the first bit plane coded data, and finally the end of the coded data is determined. This is a format in which an end code E of a predetermined bit pattern is added.

Therefore, at this time, for each color component, the bit plane coded data of the lower bit plane of the portion exceeding the set data amount is not output as, and the data amount of the code data of each color component is Limited by data volume.

FIG. 8 shows an example of a decoding apparatus for forming original image data based on color code data CD.

In the figure, a code distribution section 15 converts an R component code data CDr, a G component code data CDg, and a B component code data C from a color code data CD.
Db, respectively, to extract the code data CDr
Is applied to the bit plane decoding unit 16r, and the code data CDg is applied to the bit plane decoding unit 16g.
The code data CDb is added to the bit plane decoding unit 16b. The code distribution unit 15 extracts the value n added to the head of the input color code data CD, and outputs the value n to the bit plane data creation units 17r, 17g, and 17b as bit depth data SSn.

The bit plane decoding unit 16r sequentially decodes the eighth bit plane code data, the seventh bit plane data,... For the input code data CDr in bit plane units, and obtains the image data Is output to the bit plane data creation unit 17r. Also, the bit plane code data of the last bit plane of the code data CDr may end in the middle of one image and have an end code E added thereto. Until the image data is output to the bit plane data generation unit 17r, a decoding end signal SSb indicating a decoding error is output to the bit plane data generation unit 17r. In other cases, when the decoding of one bit plane data is completed, a decoding end signal S indicating a normal end of decoding is obtained.
Sb is output to the bit plane data creation unit 17r.

When the complete bit plane image data is input from the bit plane decoding unit 16r, the bit plane data creation unit 17r converts the image data into image data output unit 19r as the bit plane image data.
On the other hand, regarding the bit plane for which the decoding error has been notified, the insertion data generated from the insertion data generating unit 18r is arranged as the image data of the portion where the image data has not been obtained, and one bit plane is output. The image data is completed, and the completed image data is output to the image data output unit 19r as the bit plane image data. Further, the bit plane data creation unit 17r
For the bit-plane image data not output from the bit-plane decoding unit 16r, one image data is generated from the insertion data generation unit 18r, and the generated image data is Is output to the image data output unit 19r.

The insertion data generator 18r generates random data ("1", "0" random pattern data) having the number of bits specified by the bit plane data generator 17r. , Bit plane data creation unit 17r.

The image data output section 19r forms R component multi-tone image data based on the image data of each bit plane output from the bit plane data creation section 17r, and forms the formed R component multi-tone image. The data is output to the image data conversion output unit 20.

The bit plane decoding unit 16g sequentially decodes the eighth bit plane code data, the seventh bit plane data,... In units of bit planes for the input code data CDg, and obtains the image data obtained thereby. Is output to the bit plane data creation unit 17g. Also, the bit plane code data of the last bit plane of the code data CDg may end in the middle of one image and have an end code E added thereto. Until the image data is output to the bit plane data generation unit 17g, a decoding end signal SSb indicating a decoding error is output to the bit plane data generation unit 17g. In other cases, when the decoding of one bit plane data is completed, a decoding end signal S indicating a normal end of decoding is obtained.
Sb is output to the bit plane data creation unit 17g.

When the complete bit plane image data is input from the bit plane decoding unit 16g, the bit plane data generating unit 17g converts the image data into image data output unit 19g as the bit plane image data.
On the other hand, for the bit plane for which the decoding error has been notified, the insertion data generated from the insertion data generating unit 18g is arranged as the image data of the portion where the image data has not been obtained, and one bit plane is output. The image data is completed, and the completed image data is output to the image data output unit 19g as the image data of the bit plane. Further, a bit plane data creation unit 17g
For the bit plane image data not output from the bit plane decoding unit 16g, the insertion data generation unit 18g generates one image data, and the generated image data is converted to the bit plane image data. Is output to the image data output unit 19g.

The insertion data generator 18g generates random data ("1", "0" random pattern data) of the number of bits designated by the bit plane data generator 17g, and its output data is , Bit plane data creation unit 17g.

The image data output unit 19g forms G component multi-tone image data based on the image data of each bit plane output from the bit plane data creation unit 17g, and forms the formed G component multi-tone image. The data is output to the image data conversion output unit 20.

The bit plane decoding unit 16b sequentially decodes the eighth bit plane code data, the seventh bit plane data,... In units of bit planes for the input code data CDb, and obtains the image data obtained thereby. Is output to the bit plane data creation unit 17b. Also, the bit plane code data of the last bit plane of the code data CDb may end in the middle of one image and have an end code E added thereto. Until the image data is output to the bit plane data generation unit 17b, a decoding end signal SSb indicating a decoding error is output to the bit plane data generation unit 17b. In other cases, when the decoding of one bit plane data is completed, a decoding end signal S indicating a normal end of decoding is obtained.
Sb is output to the bit plane data creation unit 17b.

When the complete bit plane image data is input from the bit plane decoding unit 16b, the bit plane data creation unit 17b converts the image data into image data output unit 19b as the bit plane image data.
On the other hand, for the bit plane for which the decoding error has been notified, the insertion data generated from the insertion data generating unit 18b is arranged as the image data of the portion for which the image data has not been obtained, and one bit plane is output. The image data is completed, and the completed image data is output to the image data output unit 19b as the bit plane image data. Further, the bit plane data creation unit 17b
For the bit plane image data that is not output from the bit plane decoding unit 16b, the insertion data generation unit 18b generates one image data, and the generated image data is used as the bit plane image data. Is output to the image data output unit 19b.

The insertion data generator 18b generates random data ("1", "0" random pattern data) having the number of bits specified by the bit plane data generator 17b. , And bit plane data creation unit 17b.

The image data output section 19b forms B-component multi-tone image data based on the image data of each bit plane output from the bit-plane data creation section 17b, and forms the formed B-component multi-tone image. The data is output to the image data conversion output unit 20.

The image data conversion and output unit 20 outputs the R component multi-tone image data added from the image data output unit 19r,
Forming 24-bit original image image data CPr based on G component multi-tone image data added from the image data output portion 19g and B component multi-tone image data added from the image data output portion 19b The image data CPr is output to the next-stage device.

FIG. 9 shows a processing example of the code amount control unit 14 (14r, 14g, 14b) of the encoding apparatus shown in FIG.

First, the bit plane encoding unit 13 (13
r, 13g, 13b), one unit of data is input (process 301), and the input data amount is accumulated (process 30).
2). Then, it is determined whether or not the accumulated value is equal to or greater than a predetermined value KA (determination 303).
When it becomes O, the data for one unit input at that time is output as code data (process 304), and the process 30
Returning to step 1, the remaining data is input / output.

When the result of determination 303 is YES, the data amount of the output code data has reached the limit data amount, and in this case, a predetermined end code E
Is output (process 305), and the process for one color multi-tone image ends.

As described above, in this embodiment, since the data amount of the code data of each color component is limited to the set value, for example, the handling of the code data at the time of image distribution becomes easy.

Since the amount of code data is limited from the most significant bit plane to the least significant bit plane, the upper bit plane, which carries a greater amount of information for a monochrome multi-tone image, is used. Code data is always included, and as a result, the bit plane of the lower bits deleted due to the data amount limitation, for example,
Even when it is generated as random data, the quality of the reproduced image is quite good.

FIG. 10 shows an example of a color multi-tone image coding apparatus according to still another embodiment of the present invention. In this case, the color multi-tone image to be encoded has three primary color components of RGB, and each color component has a bit depth of 8 bits per pixel.

In the figure, 24-bit color multi-tone image data CP is applied to a color component separation section 21. The color component separation section 21 outputs the color multi-tone image data CP
Is the 8-bit R-component R multi-tone image data, G
The image data is sequentially decomposed into G multi-tone image data of component and B multi-tone image data of B component, and R multi-tone image data, G multi-tone image data, and B multi-tone image The data is sequentially added to the bit plane generation unit 22. Further, the color component separation section 21 outputs to the code output section 25 the color-related information SSa indicating the number m of color components in the color multi-tone image data CP and the bit depth n per pixel for each color component. I have.

The bit plane generation unit 22 calculates the 8th bit for each pixel of each of the R multi-gradation image data, the G multi-gradation image data, and the B multi-gradation image data which are sequentially added. To form the eighth bit plane data,
The bit plane data is output to the bit plane encoding unit 23, and then the data of the seventh bit is extracted and the data of the seventh bit is extracted.
The bit plane data is formed and the seventh bit plane data is output to the bit plane encoding unit 23. Then, the sixth bit data is extracted to form the sixth bit plane data, and the sixth bit plane data is converted into a bit. The data is output to the plane encoding unit 23, the fifth bit data is extracted to form fifth bit plane data, and the fifth bit plane data is output to the bit plane encoding unit 23. Is extracted to form fourth bit plane data, and the fourth bit plane data is encoded by the bit plane encoding unit 23.
, And then extracts the third bit data to form third bit plane data, outputs the third bit plane data to the bit plane encoding unit 23, and then extracts the second bit data. The second bit plane data is formed and the second bit plane data is output to the bit plane encoding unit 2. Then, the first bit data is extracted to form the first bit plane data, and the first bit plane data is formed. The data is output to the bit plane encoding unit 23.

Upon input of the eighth bit plane data, the bit plane coding unit 23 applies a predetermined binary image coding method to the eighth bit plane data, and codes the eighth bit plane coded data formed thereby. When the data is output to the amount control unit 24 and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane data is formed.
When the bit plane code data is output to the code amount control unit 24 and the sixth bit plane data is input, a predetermined binary image coding method is applied to the sixth bit plane data, and the sixth bit plane code formed thereby is applied. When the data is output to the code amount control unit 24 and the fifth bit plane data is input, a predetermined binary image encoding method is applied to the fifth bit plane data, and the fifth bit plane code data formed thereby is encoded. When the data is output to the amount control unit 24 and the fourth bit plane data is input, a predetermined binary image coding method is applied to the fourth bit plane data, and the fourth bit plane code data formed thereby is encoded by the code amount control unit. 24 and the third
When the bit plane data is input, a predetermined binary image encoding method is applied to the third bit plane data,
The third bit plane code data thus formed is output to the code amount control unit 24, and when the second bit plane data is input, a predetermined binary image coding method is applied to the second bit plane data, thereby forming the second bit plane data. When the second bit plane code data is output to the code amount control unit 24 and the first bit plane data is input, a predetermined binary image coding method is applied to the first bit plane data, and the first The bit plane code data is output to the code amount control unit 24.

The code amount control unit 24 sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding unit 23 as encoded data, and outputs the encoded data. When the coded data reaches a preset data amount, the output of the input bit plane coded data is stopped, and an end code E of a predetermined bit pattern representing the end of the coded data is added, and The output of the data is terminated, and the code data is applied to the code output unit 24. When the output of the code data is completed,
The end signal SE is output to the color component separation section 21. As a result, the color component separation section 21 outputs image data of the next color component.

As shown in FIG. 7 (a), the code output section 25 adds the value of the number m of color components and the value of the bit depth n to the head, and outputs the R output from the code amount control section 24. The color code data CD in which the component code data, the G component code data, and the B component code data are sequentially arranged is output. Similarly to the above, the code data of each color component is arranged in the order of the eighth bit plane encoded data to the first bit plane encoded data as shown in FIG. This is a format in which an end code E of a predetermined bit pattern representing the end of the coded data is added.

As described above, in this case, the coding apparatus can be configured only by providing the bit plane generation unit 22, the bit plane coding unit 23, and the code amount control unit 24 one by one. Cost can be reduced.

FIG. 11 shows another example of a decoding apparatus for forming original image data based on color code data CD.

In the figure, a code distribution unit 26 converts an R component code data CDr, a G component code data CDg, and a B component code data C from a color code data CD.
Db are sequentially extracted, and code data CDr,
CDg and CDb are sequentially added to the bit plane decoding unit 27. The code distribution unit 26 extracts the value n added to the head of the input color code data CD, outputs the value n to the bit plane data creation unit 28 as bit depth data SSn, and extracts the value m. The data is output to the image data conversion output unit 29 as color component number data SSm.

The bit plane decoding unit 27 converts the sequentially input code data CDr, CDg, CDb into eighth bit plane code data in units of bit planes.
The seventh bit plane data,... Are sequentially decoded, and the obtained image data is output to the bit plane data creation unit 28. Also, code data CDr, CDg, C
The bit plane code data of the last bit plane of Db may end in the middle of one image and have an end code E added thereto. The bit plane data generator 28 outputs a decoding end signal SSb indicating a decoding error to the bit plane data generator 28.
Output to In other cases, when the decoding of one bit plane data is completed, a decoding end signal SSb indicating the normal end of decoding is output to the bit plane data creation unit 28.

When the complete bit plane image data is input from the bit plane decryption unit 27, the bit plane data creation unit 28 outputs the image data to the image data output unit 31 as the bit plane image data. For the bit plane for which the decoding error has been notified, the insertion data generated from the insertion data generating unit 30 is arranged as the image data of the portion where the image data has not been obtained, and the image data of one bit plane is The completed image data is output to the image data output unit 31 as the bit plane image data.
Further, the bit plane data generation unit 28 generates one image data from the insertion data generation unit 30 for the bit plane image data not output from the bit plane decoding unit 27, and generates the generated image data. Is output to the image data output unit 31 as image data of each bit plane.

Also, the insertion data generating section 30 generates random data (“1”, “0” random pattern data) of the number of bits designated by the bit plane data generating section 28.
The output data is applied to the bit plane data creation unit 28.

The image data output unit 31 forms multi-tone image data of each color component based on the image data of each bit plane output from the bit plane data creation unit 28, The formed multi-tone image data is output to the image data conversion output unit 29.

The image data conversion output section 29 forms 24-bit original image image data CPr based on multi-tone image data of each color component added from the image data output section 31. CPr is output to the next stage device.

Therefore, in this case, only one bit plane decoding unit 27, one bit plane data creation unit 28, one insertion data generation unit 30, and one image data output unit 31 need to be provided. Cost can be significantly reduced.

FIG. 12 shows an example of a coding apparatus for a monochrome multi-tone image according to another embodiment of the present invention. In this case, the black-and-white multi-tone image to be encoded has 8 bits per pixel. In the figure, the same parts as those in FIG. 1 and corresponding parts are denoted by the same reference numerals.

In the figure, black and white multi-tone image data PX
Are added to the bit plane generation unit 1. For each pixel of the monochrome multi-tone image data PX, the bit plane generation unit 1 extracts the eighth bit data to form the eighth bit plane data, and encodes the eighth bit plane data into the bit plane encoding unit 2 , And then extract the seventh bit data to form seventh bit plane data, output the seventh bit plane data to the bit plane encoding unit 2, and then extract the sixth bit data. The sixth bit plane data is formed, and the sixth bit plane data is output to the bit plane encoding unit 2. Then, the fifth bit data is extracted to form the fifth bit plane data, and the fifth bit plane data is formed.
Outputting the bit plane data to the bit plane encoding unit 2, then extracting the fourth bit data to form fourth bit plane data, and outputting the fourth bit plane data to the bit plane encoding unit 2; Then
The third bit data is extracted to form third bit plane data, and the third bit plane data is output to the bit plane encoding unit 2. Then, the second bit data is extracted to extract the second bit plane data. And outputs the second bit plane data to the bit plane encoding unit 2. Next, the first bit data is extracted to form first bit plane data, and the first bit plane data is subjected to bit plane encoding. Output to section 2. At the same time, it outputs bit depth data Sn indicating the number of bits per bit in the monochrome multi-tone image data PX to the code amount control unit 3a.

Upon input of the eighth bit plane data, the bit plane encoding unit 2 applies a predetermined binary image encoding method to the eighth bit plane data, and encodes the eighth bit plane encoded data formed thereby. When the data is output to the amount control unit 3a and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane code data formed thereby is encoded by the code amount control unit 3a,
When the sixth bit plane data is input, a predetermined binary image coding method is applied to the sixth bit plane data, and the sixth bit plane code data formed thereby is output to the code amount control unit 3a. When the plane data is input, a predetermined binary image coding method is applied to the fifth bit plane data, and the fifth bit plane coded data formed thereby is transmitted to the code amount controller 3a.
When the fourth bit plane data is input, a predetermined binary image coding method is applied to the fourth bit plane data, and the fourth bit plane code data formed thereby is output to the code amount control unit 3a. , When the third bit plane data is input, a predetermined binary image coding method is applied to the third bit plane data, and the third bit plane code data formed thereby is output to the code amount control unit 3a. When the bit plane data is input, a predetermined binary image coding method is applied to the second bit plane data, and the second bit plane coded data formed thereby is output to the code amount control unit 3a.
When the first bit plane data is input, a predetermined binary image coding method is applied to the first bit plane data, and the first bit plane coded data formed by this is output to the code amount control unit 3a.

The code amount control unit 3a, as shown in FIG.
With the value n of the bit depth data Sn added to the head,
Eighth bit plane encoded data to first bit plane encoded data sequentially input from the bit plane encoding unit 2 are sequentially output as encoded data PD, and the output encoded data PD is output from an external device. When the data amount corresponding to the added limited data amount signal DV is reached, the output of the input bit plane encoded data is stopped, and an end code E of a predetermined bit pattern indicating the end of the encoded data PD is added. , Encoded data P
The output of D ends.

Here, the limited data amount signal DV is output from the control unit of the facsimile apparatus when the encoding apparatus is incorporated in the facsimile apparatus, for example.

FIG. 13 shows a processing example of the code amount control section 3a of the encoding apparatus shown in FIG.

First, the value of the limited data amount signal DV is input and set to the variable KB (process 401), and after outputting the value n of the data depth data Sn at the beginning of the code data PD (process 401). 402), one unit of data is input from the bit plane encoding unit 2 (process 403), and the input data amount is accumulated (process 404).

Then, it is checked whether or not the accumulated value is equal to or larger than the value of the variable KB (decision 405). If the result of the decision 405 is NO, the data for one unit inputted at that time is encoded data. Output as PD (Process 40
6) Return to the process 403 to input / output the remaining data.

When the result of the determination 405 is YES, the data amount of the output code data PD has reached the limit data amount. At this time, a predetermined end code E is output (process 407). The processing for one monochrome multi-tone image is completed.

As described above, in this embodiment, since the data amount of the code data can be appropriately set from the external device, for example, the data amount of the code data can be set to a data amount desired by the user. Can be used and the usability is improved.

FIG. 14 shows an example of a color multi-tone image coding apparatus according to another embodiment of the present invention. In this case, the color multi-tone image to be encoded is R
It has color components of three primary colors GB, and each color component has a bit depth of 8 bits per pixel.
6, the same reference numerals are given to the same parts and corresponding parts as in FIG.

In the figure, 24-bit color multi-tone image data CP is applied to a color component separation section 10. The color component separation unit 10 outputs the color multi-tone image data CP.
Are converted into 8-bit R-component R multi-gradation image data CPr, 8-bit G-component G multi-gradation image data CPg, and 8
It is to be decomposed into B multi-gradation image data CPb of bit B component, and R multi-gradation image data CPr, G multi-gradation image data CPg, and B multi-gradation image data CPb are
Bit plane generators 12r, 12g, 12b respectively
Has been added to Further, the color component separation unit 10 outputs to the code output unit 11 color related information SSa indicating the number m of color components in the color multi-tone image data CP and the bit depth n per pixel for each color component. I have.

For each pixel of the R multi-tone image data CPr, the bit plane generating unit 12r extracts the eighth bit data to form eighth bit plane data, and encodes the eighth bit plane data into a bit plane code. And outputs the seventh bit data to form a seventh bit plane data.
r, and then extracts the sixth bit data to form sixth bit plane data, outputs the sixth bit plane data to the bit plane encoding unit 13r, and then extracts the fifth bit data. To form the fifth bit plane data and output the fifth bit plane data to the bit plane encoding unit 13r. Then, the fourth bit data is extracted to form the fourth bit plane data and the fourth bit plane data is formed. The plane data is output to the bit plane encoding unit 13r, then the third bit data is extracted to form third bit plane data, and the third bit plane data is output to the bit plane encoding unit 13r. , Extracting the second bit data to form second bit plane data, and forming the second bit plane Outputs over data to the bit-plane coding unit 2, then, it outputs the first bit plane data into bit plane coding unit 13r to form the first bit plane data by extracting first bit of data.

Upon input of the eighth bit plane data, the bit plane encoding unit 13r applies a predetermined binary image encoding method to the eighth bit plane data, and encodes the eighth bit plane encoded data formed thereby. When the data is output to the amount control unit 14ra and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane coded data formed thereby is encoded by the code amount control unit. 14r
a, and when the sixth bit plane data is input,
A predetermined binary image coding method is applied to the sixth bit plane data, and the sixth bit plane coded data formed by the application is output to the code amount control unit 14ra.
When the bit plane data is input, a predetermined binary image encoding method is applied to the fifth bit plane data,
The fifth bit plane code data formed thereby is output to the code amount control unit 14ra, and when the fourth bit plane data is input, a predetermined binary image coding method is applied to the fourth bit plane data, thereby forming the fourth bit plane data. The fourth bit plane coded data thus obtained is transmitted to the code amount control unit 14.
When the third bit plane data is input and the third bit plane data is input, a predetermined binary image coding method is applied to the third bit plane data, and the third bit plane code data formed thereby is output to the code amount control unit 14ra. And
When the second bit plane data is input, a predetermined binary image coding method is applied to the second bit plane data, and the second bit plane code data formed thereby is output to the code amount control unit 14ra, and the first bit plane data is output. When the plane data is input, a predetermined binary image coding method is applied to the first bit plane data, and the first bit plane coded data formed thereby is output to the code amount control unit 14ra.

The code amount control unit 14ra sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding unit 13r as encoded data, and outputs the encoded data. When the encoded data reaches a data amount corresponding to the limited data amount signal DV applied from an external device, the output of the input bit plane encoded data is stopped, and the end of a predetermined bit pattern indicating the end of the encoded data is terminated. The code E is added, and the output of the coded data is ended. The coded data is added to the code output unit 11.

The bit plane generation unit 12g extracts the eighth bit data for each pixel of the G multi-tone image data CPg to form eighth bit plane data, and encodes the eighth bit plane data into a bit plane code. Output to the encoding unit 13g, and then extracts the seventh bit data to form seventh bit plane data, and encodes the seventh bit plane data into the bit plane encoding unit 13g.
g, and then extracts the sixth bit data to form sixth bit plane data, outputs the sixth bit plane data to the bit plane encoding unit 13g, and then extracts the fifth bit data. To generate the fifth bit plane data and output the fifth bit plane data to the bit plane encoding unit 13g. Then, the fourth bit data is extracted to form the fourth bit plane data and the fourth bit plane data is formed. The plane data is output to the bit plane encoding unit 13g, the third bit data is extracted to form third bit plane data, and the third bit plane data is output to the bit plane encoding unit 13g. , The second bit data is extracted to form second bit plane data, and the second bit plane Outputs over data to the bit-plane coding unit 2, then, it outputs the first bit plane data into bit plane coding unit 13g to form a first bit plane data by extracting first bit of data.

Upon input of the eighth bit plane data, the bit plane encoding unit 13g applies a predetermined binary image encoding method to the eighth bit plane data, and encodes the eighth bit plane encoded data formed thereby. When the seventh bit plane data is output to the amount control unit 14ga and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane code data formed thereby is encoded by the code amount control unit. 14g
a, and when the sixth bit plane data is input,
A predetermined binary image coding method is applied to the sixth bit plane data, and the sixth bit plane coded data formed by the application is output to the code amount control unit 14ga.
When the bit plane data is input, a predetermined binary image encoding method is applied to the fifth bit plane data,
The fifth bit plane code data formed thereby is output to the code amount control unit 14ga, and when the fourth bit plane data is input, a predetermined binary image coding method is applied to the fourth bit plane data, thereby forming the fourth bit plane data. The fourth bit plane coded data thus obtained is transmitted to the code amount control unit 14.
ga, and when the third bit plane data is input, a predetermined binary image coding method is applied to the third bit plane data, and the third bit plane coded data formed thereby is output to the code amount control unit 14ga. And
When the second bit plane data is input, a predetermined binary image coding method is applied to the second bit plane data, and the second bit plane code data formed by the second bit plane data is output to the code amount control unit 14ga, and the first bit plane data is output. When the plane data is input, a predetermined binary image coding method is applied to the first bit plane data, and the first bit plane coded data formed thereby is output to the code amount control unit 14ga.

The code amount control unit 14ga sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding unit 13g as encoded data, and outputs the encoded data. When the encoded data reaches a data amount corresponding to the limited data amount signal DV applied from an external device, the output of the input bit plane encoded data is stopped, and a predetermined bit pattern indicating the end of the encoded data is output. The end code E is added to end the output of the encoded data, and the encoded data is added to the code output unit 11.

The bit plane generation unit 12b extracts the eighth bit data for each pixel of the B multi-gradation image data CPb to form eighth bit plane data, and encodes the eighth bit plane data into a bit plane code. And outputs the seventh bit data to form a seventh bit plane data. The seventh bit plane data is output to the bit plane encoding unit 13b.
b, and then extracts the sixth bit data to form sixth bit plane data, outputs the sixth bit plane data to the bit plane encoding unit 13b, and then extracts the fifth bit data. To form the fifth bit plane data and output the fifth bit plane data to the bit plane encoding unit 13b, and then extract the fourth bit data to form the fourth bit plane data and generate the fourth bit plane data. The plane data is output to the bit plane encoding unit 13b, then the third bit data is extracted to form third bit plane data, and the third bit plane data is output to the bit plane encoding unit 13b. , The second bit data is extracted to form second bit plane data, and the second bit plane Outputs over data to the bit-plane coding unit 2, then, it outputs the first bit plane data into bit plane coding unit 13b to form a first bit plane data by extracting first bit of data.

Upon input of the eighth bit plane data, the bit plane coding unit 13b applies a predetermined binary image coding method to the eighth bit plane data, and codes the eighth bit plane code data formed thereby. When the data is output to the amount control unit 14ba and the seventh bit plane data is input, a predetermined binary image encoding method is applied to the seventh bit plane data, and the seventh bit plane code data formed thereby is encoded by the code amount control unit 14ba. 14b
a, and when the sixth bit plane data is input,
A predetermined binary image coding method is applied to the sixth bit plane data, and the sixth bit plane coded data formed thereby is output to the code amount control unit 14ba.
When the bit plane data is input, a predetermined binary image encoding method is applied to the fifth bit plane data,
The fifth bit plane code data formed thereby is output to the code amount control unit 14ba, and when the fourth bit plane data is input, a predetermined binary image coding method is applied to the fourth bit plane data, thereby forming the fourth bit plane data. The fourth bit plane coded data thus obtained is transmitted to the code amount control unit 14.
When the third bit plane data is input and the third bit plane data is input, a predetermined binary image encoding method is applied to the third bit plane data, and the third bit plane code data formed thereby is output to the code amount control unit 14ba. And
When the second bit plane data is input, a predetermined binary image coding method is applied to the second bit plane data, and the second bit plane coded data formed thereby is output to the code amount control unit 14ba, and the first bit plane data is output. When the plane data is input, a predetermined binary image coding method is applied to the first bit plane data, and the first bit plane coded data formed thereby is output to the code amount control unit 14ba.

The code amount control unit 14ba sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding unit 13b as encoded data, and outputs the encoded data. When the encoded data reaches a data amount corresponding to the limited data amount signal DV applied from an external device, the output of the input bit plane encoded data is stopped, and a predetermined bit pattern indicating the end of the encoded data is output. Is added, and the output of the encoded data is terminated, and the encoded data is added to the code output unit 11.

As shown in FIG. 7A, the code output unit 11 adds the value of the number m of color components and the value of the bit depth n to the head, and outputs the R output from the code amount control unit 14ra. The color code data CD in which the component code data, the G component code data output from the code amount control unit 14ga, and the B component code data output from the code amount control unit 14ba are sequentially arranged is output. As shown in FIG. 2B, the coded data of each color component is arranged in order from the eighth bit plane coded data to the first bit plane coded data, and finally the end of the coded data is determined. This is a format in which an end code E of a predetermined bit pattern is added.

FIG. 15 shows a processing example of the code amount control units 14ra, 14ga, and 14ba of the encoding apparatus shown in FIG.

First, the value of the limited data amount signal DV is input and set to a variable KB (processing 501), and one unit of data is input from the bit plane encoding units 13r, 13g, and 13b (processing 502). The calculated data amount is accumulated (process 503).

Then, it is checked whether or not the accumulated value is equal to or larger than the value of the variable KB (decision 504). If the result of the decision 504 is NO, the data of one unit input at that time is encoded data. (Process 505),
Returning to the process 502, the remaining data is input / output.

If the result of determination 504 is YES, it means that the data amount of the output code data has reached the limit data amount.
Is output (process 506), and the process for one color multi-tone image ends.

As described above, in this embodiment, the data amount of the code data of each color component can be appropriately set from an external device. For example, the data amount of the code data is set to a data amount desired by the user. And the usability is improved.

FIG. 16 shows an example of a color multi-tone image coding apparatus according to still another embodiment of the present invention. In this case, the color multi-tone image to be encoded has three primary color components of RGB, and each color component has a bit depth of 8 bits per pixel. In this figure, the same parts as those in FIG. 10 and corresponding parts are denoted by the same reference numerals.

In the figure, 24-bit color multi-tone image data CP is applied to a color component separation section 21. The color component separation section 21 outputs the color multi-tone image data CP
Is the 8-bit R-component R multi-tone image data, G
The image data is sequentially decomposed into G multi-tone image data of component and B multi-tone image data of B component, and R multi-tone image data, G multi-tone image data, and B multi-tone image The data is sequentially added to the bit plane generation unit 22. Further, the color component separation section 21 outputs to the code output section 25 the color-related information SSa indicating the number m of color components in the color multi-tone image data CP and the bit depth n per pixel for each color component. I have.

The bit plane generation unit 22 determines whether the R multi-gradation image data, the G multi-gradation image data, and the B multi-gradation image data are sequentially added to the 8th bit. To form the eighth bit plane data,
The bit plane data is output to the bit plane encoding unit 23, and then the data of the seventh bit is extracted and the data of the seventh bit is extracted.
The bit plane data is formed and the seventh bit plane data is output to the bit plane encoding unit 23. Then, the sixth bit data is extracted to form the sixth bit plane data, and the sixth bit plane data is converted into a bit. The data is output to the plane encoding unit 23, the fifth bit data is extracted to form fifth bit plane data, and the fifth bit plane data is output to the bit plane encoding unit 23. Is extracted to form fourth bit plane data, and the fourth bit plane data is encoded by the bit plane encoding unit 23.
, And then extracts the third bit data to form third bit plane data, outputs the third bit plane data to the bit plane encoding unit 23, and then extracts the second bit data. The second bit plane data is formed and the second bit plane data is output to the bit plane encoding unit 2. Then, the first bit data is extracted to form the first bit plane data, and the first bit plane data is formed. The data is output to the bit plane encoding unit 23.

Upon input of the eighth bit plane data, the bit plane coding unit 23 applies a predetermined binary image coding method to the eighth bit plane data, and codes the eighth bit plane code data formed thereby. When the data is output to the amount control unit 24a and the seventh bit plane data is input, a predetermined binary image coding method is applied to the seventh bit plane data, and the seventh bit plane code data formed thereby is encoded by the code amount control unit. When the sixth bit plane data is input and the sixth bit plane data is input, a predetermined binary image encoding method is applied to the sixth bit plane data, and the sixth bit plane code data formed thereby is output to the code amount control unit 24a. Then, when the fifth bit plane data is input, a predetermined two An image coding method is applied, and the fifth bit plane code data formed by this is output to the code amount control unit 24a, and when the fourth bit plane data is input, the predetermined binary image coding for the fourth bit plane data is performed. When the third bit plane data is input to the code amount control unit 24a and the third bit plane data is input, a predetermined binary image coding method is applied to the third bit plane data. Then, the third bit plane code data formed thereby is output to the code amount control unit 24a, and when the second bit plane data is input, a predetermined binary image coding method is applied to the second bit plane data, Is output to the code amount control unit 24a, and the first bit play The data input, the first bit plane data by applying a predetermined binary image encoding scheme, and outputs the first bit-plane coding data formed by it to the code amount control unit 24a.

The code amount control section 24a sequentially outputs the eighth bit plane encoded data to the first bit plane encoded data sequentially input from the bit plane encoding section 23 as encoded data, and outputs the encoded data. When the encoded data reaches a data amount corresponding to the limited data amount signal DV applied from an external device, the output of the input bit plane encoded data is stopped, and a predetermined bit pattern indicating the end of the encoded data is output. Is added, and the output of the encoded data is terminated. The encoded data is added to the code output unit 25. When the output of the code data is completed, an end signal SE is output to the color component separation section 21. As a result, the color component separation section 21 outputs image data of the next color component.

As shown in FIG. 7A, the code output section 25 adds the value of the number m of color components and the value of the bit depth n to the head, and outputs the R output from the code amount control section 24a. The color code data CD in which the component code data, the G component code data, and the B component code data are sequentially arranged is output.

The code data of each color component is
Similarly to the above, as shown in FIG. 7B, the eighth bit plane encoded data to the first bit plane encoded data are sequentially arranged, and finally, the end of a predetermined bit pattern indicating the end of the encoded data This is a format to which a code E is added.

As described above, in this case, the coding apparatus can be configured only by providing the bit plane generation unit 22, the bit plane coding unit 23, and the code amount control unit 24a one by one. Cost can be reduced. In addition, since the data amount of each color component can be controlled from an external device, the usability of the encoding device is improved.

FIG. 17 shows a group 3 facsimile apparatus according to still another embodiment of the present invention. In addition,
This group 3 facsimile apparatus can read a transmission original as a black-and-white multi-valued image (multi-tone image) and record and output a received original as a black-and-white multi-valued image.

In the figure, a control unit 31 performs control processing of each unit of the group 3 facsimile apparatus and facsimile transmission control procedure processing. A system memory 32 stores a control processing program executed by the control unit 31. , And various data required when executing the processing program, and constitutes a work area of the control unit 31.
Is for storing various information unique to the group 3 facsimile apparatus.

The multi-value scanner 34 is for reading an original image at a predetermined resolution and a predetermined gradation, and the multi-value plotter 35 is for reading an image at a predetermined resolution and a predetermined gradation. The operation display section 36 is for operating the facsimile apparatus, and includes various operation keys and various display devices.

The encoding / decoding section 37 encodes and compresses the image signal and decodes the encoded and compressed image information into the original image signal. The encoding function is as shown in FIG. The encoding device shown in FIG. 12 is provided, and as the decoding function, the decoding device shown in FIG. 3 is provided. The image storage device 38 is for storing a large number of encoded and compressed image information.

The group 3 facsimile modem 39 is for realizing the modem function of the group 3 facsimile. The group 3 facsimile modem 39 has a low-speed modem function (V.21 modem) for exchanging transmission procedure signals and mainly exchanges image information. High-speed modem function (V.17 modem,
V. 33 modem; 29 modem, V.29. 27ter modem etc.).

The network control device 40 is for connecting the facsimile apparatus to a public telephone line network and has an automatic transmission / reception function.

The control unit 31 and the system memory 3
2, parameter memory 33, multi-value scanner 34, multi-value plotter 35, operation display unit 36, encoding / decoding unit 37, image storage device 38, group 3 facsimile modem 39,
The network control device 40 is connected to an internal bus 41, and data exchange between these elements is mainly performed via the internal bus 41.

Data exchange between the network controller 40 and the group 3 facsimile modem 39 is directly performed.

FIG. 18 shows an example of the image information transmitting process of the facsimile apparatus shown in FIG.

First, a call is made to the designated destination (process 6).
01), a predetermined pre-transmission procedure is executed to set various conditions for image information transmission with the partner terminal (step 60).
2). At this time, since the partner terminal notifies the receivable data amount as a device function, the value of the notified data amount is used as the device function by the code amount control unit of the encoding device of the encoding / decoding unit 37. The limit data amount signal DV to be added to 3a is set (process 603). As a result, thereafter, in the encoding / decoding unit 37, the data amount of the output coded data is limited to the value of the limited data amount signal DV.

Next, the image of the transmission document for one page is read by the multi-level scanner 34 (process 604), and the obtained black-and-white multi-tone image data is encoded and decoded by the encoding / decoding section 3.
7, the image information (code data PD) obtained by this is transmitted to the other terminal (process 606), and a corresponding post-message signal is transmitted at that time (process 607).
A response signal is received from the partner terminal (process 608).

Here, it is checked whether or not another transmission original is set on the multi-valued scanner 34 (decision 609). An image transmission operation is performed.

If the image transmission operation for all transmission originals has been completed and the result of determination 609 is NO, a disconnection command signal DCN is transmitted (process 610), and the line is restored (process 611). , A series of transmission operations ends.

As described above, in this embodiment, since the data amount of the transmission image information is suppressed to the data amount that can be received by the partner terminal, appropriate multi-valued image information (multi-tone image information) is transmitted. It can be performed.

In the above-described embodiment, the insertion data generating section generates the image data to be inserted by the pseudo-random generation processing. However, the insertion data is generated by other data generation processing, for example, the well-known prediction processing. Image data to be generated.

In the above-described embodiment, when the number of bits per pixel of the monochrome multi-tone image data is 8 bits,
Also, although the number of bits per pixel of the color multi-tone image data is 24 bits (8 bits for each color component), the present invention can be similarly applied to other numbers of bits. .

Further, in the above-described embodiment, the case where the three primary colors of RGB are used as the color components of the color multi-tone image data has been described. Can be applied.

In the above-described embodiment, the communication function having the group 3 facsimile communication function has been described. However, other communication functions such as the group 4 facsimile communication function and the general-purpose data transmission function can be used. The present invention can be similarly applied to

[0156]

As described above, according to the present invention,
Since the amount of code data when encoding and compressing a black-and-white multi-tone image or a color multi-tone image can be limited to a predetermined value or a value specified from the outside, for example, There is an effect that the handling of the code data at the time of distribution becomes easy.

In addition, since the original black-and-white multi-tone image or color multi-tone image can be restored from the code data whose data amount is limited, such code data can be appropriately handled. Get.

In the image communication, when the data amount that can be handled by the partner terminal is limited, the data amount of the transmission image information of the monochrome multi-tone image or the color multi-tone image can be limited to the limited data amount. Thus, an effect is obtained that image communication of a monochrome multi-tone image or a color multi-tone image can be efficiently performed.

Since the data amount is restricted from the bit plane of the most significant bit to the bit plane of the lower bit, the upper bit that carries a larger amount of information for a monochrome multi-tone image or a color multi-tone image. Bit plane code data is always included, and as a result, even if the lower-order bit plane deleted due to the data amount limitation is generated as random data, for example,
The effect that the image quality of the reproduced image is quite good is also obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a monochrome multi-tone image encoding apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of code data PD.

FIG. 3 is a block diagram illustrating an example of a decoding device that forms original image data based on code data PD.

FIG. 4 is a flowchart illustrating a processing example of a code amount control unit of the encoding device.

FIG. 5 is a flowchart illustrating an example of processing of a bit pattern data creation unit of the decoding device.

FIG. 6 is a block diagram showing an example of a color multi-tone image coding apparatus according to another embodiment of the present invention.

FIG. 7 is a schematic diagram showing an example of color code data.

FIG. 8 is a block diagram illustrating an example of a decoding device that forms original image data based on color code data CD.

FIG. 9 is a flowchart showing a processing example of a code amount control unit of the encoding device shown in FIG. 6;

FIG. 10 is a block diagram showing an example of a color multi-tone image coding apparatus according to still another embodiment of the present invention.

FIG. 11 is a block diagram showing another example of a decoding device that forms original image data based on color code data CD.

FIG. 12 is a block diagram showing an example of a coding apparatus for a black-and-white multi-tone image according to another embodiment of the present invention.

FIG. 13 is a flowchart illustrating an example of processing of a code amount control unit of the encoding device illustrated in FIG. 12;

FIG. 14 is a block diagram showing an example of a color multi-tone image coding apparatus according to another embodiment of the present invention.

15 shows a processing example of a code amount control unit of the encoding device shown in FIG.

FIG. 16 is a block diagram showing an example of a color multi-tone image coding apparatus according to still another embodiment of the present invention.

FIG. 17 is a block diagram showing a group 3 facsimile apparatus according to still another embodiment of the present invention.

18 is a flowchart showing a processing example at the time of transmission of the device of FIG. 17;

[Explanation of symbols]

1, 12r, 12g, 12b, 22-bit plane generating unit 2, 13r, 13g, 13b, 23-bit plane encoding unit 3, 3a, 14r, 14ra, 14g, 14ga, 14
b, 14ba, 24, 24a Code amount control unit 4, 16r, 16g, 16b, 27 bit plane decoding unit 5, 17r, 17g, 17b, 28 bit plane data creation unit 6, 18r, 18g, 18b, 30 Insert data Generation unit 7, 19r, 19g, 19b, 31 Image data output unit 10, 21 Color component separation unit 11, 25 Code output unit 15, 26 Code distribution unit 20, 29 Image data output conversion unit 31, Control unit 32 System memory 33 Parameter Memory 34 Multi-level scanner 35 Multi-level plotter 37 Encoding / decoding unit

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 1/41-1/419

Claims (17)

(57) [Claims] 1. A bit plane formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and performing a binary encoding process for each bit plane. In an image processing apparatus for encoding and compressing an original image, the bit-plane data is binary-coded in bit-plane units from the bit plane of the most significant bit to the bit plane of the lower-order bit, and the binary encoded data is A bit plane encoding means for outputting the data amount, and a code amount for limiting the total data amount per bit plane calculated in the output order of the binary encoded data output from the bit plane encoding means to within a predetermined value. An image processing apparatus comprising control means. 2. A bit plane formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and performing a binary encoding process for each bit plane. In an image processing apparatus for encoding and compressing an original image, the bit-plane data is binary-coded in bit-plane units from the bit plane of the most significant bit to the bit plane of the lower-order bit, and the binary encoded data is Bit plane encoding means for outputting the total data amount per bit plane calculated in the output order of the binary encoded data output from the bit plane encoding means, within a predetermined value, A code amount control method for adding information representing the number of bits per pixel of the original image to the head of the binary coded data. The image processing apparatus characterized by comprising a. 3. A bit plane formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and performing a binary encoding process for each bit plane. In an image processing apparatus for encoding and compressing an original image, the bit-plane data is binary-coded in bit-plane units from the bit plane of the most significant bit to the bit plane of the lower-order bit, and the binary encoded data is Bit plane encoding means for outputting a data amount limit value input means for inputting a data amount limit value of the binary encoded data, and output of the binary encoded data output from the bit plane encoding means. A code amount for limiting the total data amount in the bit plane unit calculated in order within the limit value input from the data amount limit value input means. An image processing apparatus comprising control means. 4. A bit plane is formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and a binary encoding process is performed for each bit plane. In an image processing apparatus for encoding and compressing an original image, the bit-plane data is binary-coded in bit-plane units from the bit plane of the most significant bit to the bit plane of the lower-order bit, and the binary encoded data is Bit plane encoding means for outputting a data amount limit value input means for inputting a data amount limit value of the binary encoded data, and output of the binary encoded data output from the bit plane encoding means. The total data amount in the bit plane unit calculated in order is limited to within the limit value input from the data amount limit value input means. And a code amount control means for adding information representing the number of bits per pixel of the original image to the head of the binary coded data. 5. A bit plane formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and performing a binary encoding process for each bit plane. An image processing apparatus that decodes image data of an original image based on the encoded data obtained by decoding the binary encoded data for each of the bit planes. A bit plane decoding unit that forms a unit of image data; and a bit plane image data of a lower bit that cannot be decoded normally among the bit plane unit decoded image data output from the bit plane decoding unit. Inserting image data generating means for generating interpolated image data for interpolating Bit plane data generating means for forming image data of an original image based on the decoded image data normally decoded and output from and the interpolated image data output from the inserted image data generating means. An image processing apparatus characterized by the above-mentioned. 6. A bit plane formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image composed of a plurality of bits per pixel, and performing a binary encoding process for each bit plane. An image processing apparatus for decoding image data of an original image based on the coded data obtained in the above step, comprising: a bit plane for decoding the binary coded data for each bit plane to form image data in a bit plane unit Decoding means, of the bit-plane-decoded image data output from the bit-plane decoding means, bit-plane image data of lower bits that could not be decoded normally;
And the number of bit planes corresponding to information representing the number of bits per pixel of the original image added to the head of the binary coded data and the number of bit planes normally decoded by the bit plane decoding means. , The inserted image data generating means for generating image data of lower bits corresponding to the number of bit planes corresponding to the difference between the bit planes, the decoded image data output from the bit plane decoding means, An image processing apparatus comprising: bit plane data generating means for forming image data of an original image based on image data to be processed. 7. Bit data of the same bit order for each color component is extracted for each pixel from a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel. An image processing apparatus that forms a bit plane, performs binary coding for each bit plane, and encodes and compresses the original image. For each color component, the data of the bit plane is converted into the most significant bit. Bit plane encoding means for performing binary encoding in units of bit planes and outputting binary encoded data from the plane to the bit plane of lower bits, and for each color component, output from the bit plane encoding means. The total data amount per bit plane calculated in the output order of binary encoded data The image processing apparatus characterized by comprising a code amount control means for limiting within a value was. 8. A color multi-tone image comprising a plurality of color components and one color component comprising a plurality of bits per pixel. For each color component, bit data having the same bit order is extracted for each pixel. An image processing apparatus that forms a bit plane, performs binary coding for each bit plane, and encodes and compresses the original image. For each color component, the data of the bit plane is converted into the most significant bit. A plurality of bit plane coding means for performing binary coding in units of bit planes and outputting binary coded data from the plane to a bit plane of lower bits, and the plurality of bit plane codings for each color component Means the total data amount in bit plane units calculated in the output order of the binary encoded data output from the means. The image processing apparatus characterized by comprising a plurality of code amount control means for limiting respectively within order determined value of Flip. 9. From a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel, bit data of the same bit order is extracted for each pixel for each color component. An image processing apparatus that forms a bit plane, performs binary coding for each bit plane, and encodes and compresses the original image. For each color component, the data of the bit plane is converted into the most significant bit. Bit plane encoding means for performing binary encoding on a bit plane basis and outputting binary encoded data from the plane to the bit plane of lower bits, and for each color component, the bit plane encoding means The total data amount per bit plane calculated in the output order of binary encoded data And a code amount control means for adding information indicating the number of color components and the number of bits per pixel at the beginning of the binary coded data. apparatus. 10. A bit data having the same bit order for each color component is extracted for each pixel from a color multi-tone image including a plurality of color components and one color component including a plurality of bits per pixel. An image processing apparatus that forms a bit plane, performs binary coding for each bit plane, and encodes and compresses the original image. For each color component, the data of the bit plane is converted into the most significant bit. A plurality of bit plane coding means for performing binary coding in units of bit planes and outputting binary coded data from the plane to a bit plane of lower bits, and the plurality of bit plane codings for each color component The total data amount in bit plane units calculated in the output order of the binary coded data output from the A plurality of code amount control means for limiting information within a predetermined value and adding information indicating the number of color components and the number of bits per pixel to the head of the binary coded data are provided. An image processing apparatus characterized by the above-mentioned. 11. Bit data of the same bit order for each color component is extracted for each pixel from a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel. An image processing apparatus that forms a bit plane, performs binary coding for each bit plane, and encodes and compresses the original image. For each color component, the data of the bit plane is converted into the most significant bit. A bit plane encoding unit that performs binary encoding in bit plane units and outputs binary encoded data from the plane to a bit plane of lower bits, and inputs a limit value of a data amount of the binary encoded data. Data amount limit value input means, and a binary code output from the bit plane coding means for each color component. An image processing apparatus, comprising: a code amount control unit that limits a total data amount in a bit plane unit calculated in an output order of encoded data to a limit value input from the data amount limit value input unit. 12. From a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel, bit data of the same bit order is extracted for each pixel for each color component. An image processing apparatus that forms a bit plane, performs binary coding for each bit plane, and encodes and compresses the original image. For each color component, the data of the bit plane is converted into the most significant bit. A bit plane encoding unit that performs binary encoding in bit plane units and outputs binary encoded data from the plane to a bit plane of lower bits, and inputs a limit value of a data amount of the binary encoded data. Data amount limit value input means, and a binary code output from the bit plane coding means for each color component. The total data amount in bit plane units calculated in the output order of the encoded data is limited to within the limit value input from the data amount limit value input means, and the number of color components and An image processing apparatus comprising a code amount control unit for adding information indicating the number of bits per pixel. 13. A binary coding process for each color component for each bit plane from a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel. An image processing apparatus that decodes image data of an original image based on the encoded data obtained by decoding the binary encoded data for each of the bit planes. A bit plane decoding unit that forms a unit of image data; and a bit plane image data of a lower bit that cannot be decoded normally among the bit plane unit decoded image data output from the bit plane decoding unit. An insertion image data generating means for generating interpolation image data for interpolating Bit plane data generating means for forming image data of each color component based on the decoded image data that is normally decoded and output, and the interpolated image data output from the inserted image data generating means, An image processing apparatus comprising: an image data conversion output unit that forms image data of an original image based on image data of each color component output from the bit plane data generation unit. 14. A binary encoding process for each bit plane for each color component from a color multi-tone image composed of a plurality of color components and one color component composed of a plurality of bits per pixel. An image processing apparatus for decoding image data of an original image based on the coded data obtained in the above step, comprising: a bit plane for decoding the binary coded data for each bit plane to form image data in a bit plane unit Decoding means, of the bit-plane-decoded image data output from the bit-plane decoding means, bit-plane image data of lower bits that could not be decoded normally;
And the number of bit planes corresponding to information representing the number of bits per pixel of the original image added to the head of the binary coded data and the number of bit planes normally decoded by the bit plane decoding means. , The inserted image data generating means for generating image data of lower bits corresponding to the number of bit planes corresponding to the difference between the bit planes, the decoded image data output from the bit plane decoding means, Bit plane data generating means for forming image data of each color component based on image data to be processed, and the binary coding based on image data of each color component output from the bit plane data generating means. Image data conversion output that forms the image data of the original image corresponding to the number of color components added to the head of the data The image processing apparatus characterized by comprising means. 15. The image processing apparatus according to claim 5, wherein said insertion image data generating means generates image data composed of pseudo-random data. apparatus. 16. A bit plane formed by extracting bit data of the same bit order for each pixel from a monochrome multi-tone image consisting of a plurality of bits per pixel, and performing a binary encoding process for each bit plane. An image processing apparatus having a transmission function of transmitting the binary coded data to the destination terminal by a predetermined transmission procedure while encoding and compressing the original image. Bit plane encoding means for performing binary encoding on a bit plane basis and outputting binary encoded data from the plane to a bit plane of lower bits, and binary encoded data output from the bit plane encoding means The total data amount per bit plane calculated in the output order of The image processing apparatus characterized by comprising a code amount control means for limiting within. 17. Bit data having the same bit order for each color component is extracted for each pixel from a color multi-tone image including a plurality of color components and one color component including a plurality of bits per pixel. A transmission function that forms binary bit planes, performs binary coding for each bit plane, encodes and compresses the original image, and transmits the binary coded data to the destination terminal according to a predetermined transmission procedure. An image processing apparatus comprising: for each color component, the bit-plane data is binary-coded in bit-plane units from the bit plane of the most significant bit to the bit plane of the lower-order bit, and the binary encoded data Output from the bit plane encoding means for each color component. Code amount control means for limiting the total data amount per bit plane calculated in the output order of the binary coded data to within a limit value notified from a partner terminal by a predetermined pre-transmission procedure. Image processing device.