Video coding device and video decoding device

• US 20020009142A1
• Filed: 06/07/2001
• Published: 01/24/2002
• Est. Priority Date: 05/29/1997
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Aono, Tomoko, Katata, Hiroyuki, Kusao, Hiroshi, Saiga, Hisashi
• Granted Patent: US 6,813,314 B2
• Time in Patent Office: Days
• US Class Current: 375/240.11
• CPC Class Codes: H04N 11/042 Codec means
• CPC Class Codes: H04N 19/129 Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/36 Scalability techniques involving formatting the layers as a function of picture distortion after decoding, e.g. signal-to-noise [SNR] scalability
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/63 using sub-band based transform, e.g. wavelets
• CPC Class Codes: H04N 19/64 characterised by ordering of coefficients or of bits for transmission

Abstract

A video coding device capable of adaptively processing input video data according to property of the data and realizing effective progressive transmission of the coded data even if image components are different in size and/or different in the number of subbands. The above-mentioned object can be realized by the provision of a transferring-order deciding and ranging portion that can prepare an integrated component unit by forming combinations of subband-based frequency-coefficients of respective components Y, U and V and can change the number of respective elements of respective components Y, U and V.

Claims

1. A video coding device provided with a subband-decomposing means for decomposing an image being composed of N (N≧

2) kinds of luminance or chrominance components into subband images for each of components Aⁿ (1≦

n≦

N, where n is an integer) composing an image to be coded, coefficient coding means for encoding a frequency coefficient of the subband images, rearranging means for preparing integrated component units by combining frequency coefficients included in respective components Aⁿ according to the coded coefficient data prepared by the coefficient coding means and rearranging the prepared integrated component units of the coefficient-coded data in an ascending order of subband image resolution, starting from the integrated component unit including the coded coefficient data of the lowest resolution subband, and a variable-length coding means for performing variable-length encoding of the rearranged coefficient-coded data, wherein the rearranging means prepares each of the integrated component units by setting therein the frequency coefficients contained in the respective components Aⁿ, said coefficients being all frequency-coefficients included in m (m≧

1) subbands for respective components Aⁿ when the components Aⁿ have the same size and the same number of subbands.

2. A video coding device provided with a subband-decomposing means for decomposing an image being composed of N (N≧

2) kinds of luminance or chrominance components into subband images for each of components Aⁿ (1≦

n≦

N, where n is an integer) composing an image to be coded, coefficient coding means for encoding a frequency coefficient of the subband images, rearranging means for preparing integrated component units by combining frequency coefficients included in respective components Aⁿ according to the coded coefficient data prepared by the coefficient coding means and rearranging the prepared integrated component units of the coefficient-coded data in an ascending order of subband image resolution, starting from the integrated component unit including the coded coefficient data of the lowest resolution subband, and a variable-length coding means for performing variable-length encoding of the rearranged coefficient-coded data, wherein the rearranging means prepares each of the integrated component units by setting therein the frequency coefficients included in the respective components Aⁿ, said coefficients being m (m≧

1) pieces of frequency-coefficients contained at the same relative positions in m (m≧

1) pieces of the respective components'"'"' subbands when the components Aⁿ have the same size and the same number of subbands.

3. A video coding device provided with a subband-decomposing means for decomposing an image being composed of N (N≧

2) kinds of luminance or chrominance components into subband images for each of components Aⁿ (1≦

n≦

N, where n is an integer) composing an image to be coded, coefficient coding means for encoding a frequency coefficient of the subband images, rearranging means for preparing integrated component units by combining frequency coefficients included in respective components Aⁿ according to the coded coefficient data prepared by the coefficient coding means and rearranging the prepared integrated component units of the coefficient-coded data in an ascending order of subband image resolution, starting from the integrated component unit including the coded coefficient data of the lowest resolution subband, and a variable-length coding means for performing variable-length encoding of the rearranged coefficient-coded data, wherein the rearranging means prepares each of the integrated component units by setting therein the different number of frequency-coefficients in the respective components Aⁿ according to each component size when the components Aⁿ are different in size and have the same number of subbands.

4. A video coding device provided with a subband-decomposing means for decomposing an image being composed of N (N≧

2) kinds of luminance or chrominance components into subband images for each of components Aⁿ (1≦

n≦

N, where n is an integer) composing an image to be coded, coefficient coding means for encoding a frequency coefficient of the subband images, rearranging means for preparing integrated component units by combining the subbands included in respective components Aⁿ according to the coded coefficient data prepared by the coefficient coding means and rearranging the prepared integrated component units of the coefficient-coded data in an ascending order of subband image resolution, starting from the integrated component unit including the coded coefficient data of the lowest resolution subband, and a variable-length coding means for performing variable-length encoding of the rearranged coefficient-coded data, wherein the rearranging means prepares each of the integrated component units by combining the same number of low-resolution subbands and the different number of high-resolution subbands for the respective components Aⁿ when the components Aⁿ are different in size and different in the number of subbands.

5. A video coding device provided with a subband-decomposing means for decomposing an image being composed of N (N≧

2) kinds of luminance or chrominance components into subband images for each of components Aⁿ (1≦

n≦

N, where n is an integer) composing an image to be coded, coefficient coding means for encoding a frequency coefficient of the subband images, rearranging means for preparing integrated component units by combining the subbands included in respective components Aⁿ according to the coded coefficient data prepared by the coefficient coding means and rearranging the prepared integrated component units of the coefficient-coded data in an ascending order of subband image resolution, starting from the integrated component unit including the coded coefficient data of the lowest resolution subband, and a variable-length coding means for performing variable-length encoding of the rearranged coefficient-coded data, wherein the rearranging means prepares each of the integrated component units by combining the same number of high-frequency subbands and low-frequency subbands being different in number for respective components Aⁿ when the components Aⁿ are different in sizes and different in the number of subbands.

6. A video-coding device as defined in claim 5, wherein the rearranging means prepares each of the integrated component units by combining lowest ones of resolution subbands of the respective components Aⁿ and all other low-resolution subbands being different in number for respective components Aⁿ.

7. A video decoding device provided with a variable-length decoding means for decoding variable-length coded data, a decoded-data counting means for counting bits of each integrated component unit decoded by the variable-length decoding means, a decoding truncating means for comparing the number of bits counted by the decoded-data counting means with an externally-given number of bits and giving a decoding-stop command when the number of decoded bits exceeds the given number of bits, a component separating means for separating the decoded integrated component unit into respective components An, a data completing means for compensating for lack of truncated data by adding a specified value to each of the components composing a screenful image, data arranging means for arranging coded coefficient data separated by the component separating means into specified positions for respective components Aⁿ, a coefficient decoding means for decoding coded-coefficient data separated and arranged for respective components Aⁿ by the component separating means, and a subband synthesizing means for reproducing a decoded image by combining subbands of data decoded by the coefficient decoding means for respective components Aⁿ, wherein the component separating means separates the integrated component unit as combinations of all frequency coefficients contained in m(m≧

1) subbands for respective components Aⁿ when the components Aⁿ have the same size and the same number of subbands.

8. A video decoding device provided with a variable-length decoding means for decoding variable-length coded data, a decoded-data counting means for counting bits of each integrated component unit decoded by the variable-length decoding means, a decoding truncating means for comparing the number of bits counted by the decoded-data counting means with an externally-given number of bits and giving a decoding-stop command when the number of decoded bits exceeds the given number of bits, a component separating means for separating the decoded integrated component unit into respective components Aⁿ, a data completing means for compensating for lack of truncated data by adding a specified value to each of the components composing a screenful image, data arranging means for arranging coded coefficient data separated by the component separating means into specified positions for respective components Aⁿ, a coefficient decoding means for decoding coded-coefficient data separated and arranged for respective components Aⁿ by the component separating means, and a subband synthesizing means for reproducing a decoded image by combining subbands of data decoded by the coefficient decoding means for respective components Aⁿ, wherein the component separating means separates the integrated component unit as combinations of m (m≧

1) pieces of frequency coefficients having the same relative positions in respective m (m≧

1) subbands of the respective components Aⁿ when the components Aⁿ have the same size and the same number of subbands.

9. A video decoding device provided with a variable-length decoding means for decoding variable-length coded data, a decoded-data counting means for counting bits of each integrated component unit decoded by the variable-length decoding means, a decoding truncating means for comparing the number of bits counted by the decoded-data counting means with an externally-given number of bits and giving a decoding-stop command when the number of decoded bits exceeds the given number of bits, a component separating means for separating the decoded integrated component unit into respective components Aⁿ, a data completing means for compensating for lack of truncated data by adding a specified value to each of the components composing a screenful image, data arranging means for arranging coded coefficient data separated by the component separating means into specified positions for respective components Aⁿ, a coefficient decoding means for decoding coded-coefficient data separated and arranged for respective components Aⁿ by the component separating means, and a subband synthesizing means for reproducing a decoded image by combining subbands of data decoded by the coefficient decoding means for respective components Aⁿ, wherein the component separating means separates the integrated component unit as combinations of the different number of frequency coefficients for respective components Aⁿ according to respective component sizes when the components Aⁿ are different in size and have the same number of subbands.

10. A video decoding device provided with a variable-length decoding means for decoding variable-length coded data, a decoded-data counting means for counting bits of each integrated component unit decoded by the variable-length decoding means, a decoding truncating means for comparing the number of bits counted by the decoded-data counting means with an externally-given number of bits and giving a decoding-stop command when the number of decoded bits exceeds the given number of bits, a component separating means for separating the decoded integrated component unit into respective components Aⁿ, a data completing means for compensating for lack of truncated data by adding a specified value to each of the components composing a screenful image, data arranging means for arranging coded coefficient data separated by the component separating means into specified positions for respective components Aⁿ, a coefficient decoding means for decoding coded-coefficient data separated and arranged for respective components Aⁿ by the component separating means, and a subband synthesizing means for reproducing a decoded image by combining subbands of data decoded by the coefficient decoding means for respective components Aⁿ, wherein the component separating means separates the integrated component unit as combinations of the same number of low-resolution subbands and the different number of high-resolution subbands for respective components Aⁿ when the components Aⁿ are different in size and different in the number of subbands.

11. A video decoding device provided with a variable-length decoding means for decoding variable-length coded data, a decoded-data counting means for counting bits of each integrated component unit decoded by the variable-length decoding means, a decoding truncating means for comparing the number of bits counted by the decoded-data counting means with an externally-given number of bits and giving a decoding-stop command when the number of decoded bits exceeds the given number of bits, a component separating means for separating the decoded integrated component unit into respective components Aⁿ, a data completing means for compensating for lack of truncated data by adding a specified value to each of the components composing a screenful image, data arranging means for arranging coded coefficient data separated by the component separating means into specified positions for respective components Aⁿ, a coefficient decoding means for decoding coded-coefficient data separated and arranged for respective components Aⁿ by the component separating means, and a subband synthesizing means for reproducing a decoded image by combining subbands of data decoded by the coefficient decoding means for respective components Aⁿ, wherein the component separating means separates the integrated component unit as combinations of the same number of high-resolution subbands and different pieces of low-resolution subbands for respective components Aⁿ when the components Aⁿ are different in size and different in the number of subbands.

12. A video-decoding device as defined in claim 11, wherein the component separating means separates the integrated component unit as combinations of subbands for respective components, each combination composed of one lowest resolution subband and different numbers of all other low-resolution subbands.