1. An adaptive variable-length coding method whereby quantized orthogonal transform coefficients are scanned in a zigzag pattern, are modified into run, level data and then are variable-length coded in a coding system for image data, said method comprising the steps of:
setting a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to statistical characteristics of said run, level data;
selecting one of said plurality of variable-length coding tables according to intrainter mode information of the currently processed block, zigzag scanning position and quantization step size; and
variable-length coding the orthogonal transform coefficients according to said selected variable-length coding table, wherein said selecting step has the selecting range of a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to said intrainter mode information of the currently Processed block.
2. The adaptive variable-length coding method as claimed in claim 1, wherein said variable-length coding table is selected in accordance with said zigzag scanning position and quantization step size within the range determined by the corresponding mode.
3. The adaptive variable-length coding method as claimed in claim 1, wherein data of said escape region of said variable-length coding table selected in said variable-length-coding step is coded into data having variable run-length and level-length.
4. An adaptive variable-length decoding method for decoding the data coded by said adaptive variable-length coding method as claimed in claim 1, in a decoding system for image data, said decoding method comprises the steps of:
setting a plurality of variable-length decoding tables having different patterns of a regular region and an escape region according to statistical characteristics of the run, level data;
inputting intrainter mode information transmitted from said coding system;
inputting quantization step size transmitted from said coding system;
detecting position information while zigzag-scanning by accumulating run values of run, level data;
selecting one of said plurality of variable-length coding tables according to said intrainter mode information, quantization step size and position information; and
variable-length decoding the data received according to said selected variable-length coding table.
5. The adaptive variable-length decoding method as claimed in claim 4, wherein said variable-length decoding table selecting step has the selection range of a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to said intrainter mode information of the currently processed block in said mode information inputting step.
6. The adaptive variable-length decoding method as claimed in claim 5, wherein said variable-length decoding table is selected in accordance with said zigzag scanning position and quantization step size within the range determined by the corresponding mode.
7. The adaptive variable-length decoding method as claimed in claim 4, wherein data of said escape region of said variable-length decoding table selected in said variable-length-decoding step is decoded into run, level data corresponding to variable run-length and level-length.
8. An adaptive variable-length decoding method for decoding image data encoded by an adaptive variable-length coding method, in which quantized orthogonal transform coefficients of the image data are scanned in a predetermined pattern and are encoded, the decoding method comprising:
selecting one of a plurality of variable-length decoding tables according to intrainter mode information, scanning position information and quantization step size, wherein the plurality of variable-length decoding tables comprise:
a table selectable for an alternating-current (AC) component of an intra mode that is different from a table selectable for an inter mode;
a table selectable for a direct-current (DC) component of the intra mode;
a table selectable for a direct-current (DC) component of an inter mode; and
a table selectable for an alternating-current (AC) component of the inter mode;
variable-length decoding the encoded quantized orthogonal transform coefficients according to the selected variable-length decoding table.
9. The adaptive variable-length decoding method of claim 8, wherein said variable-length decoding tables have different patterns of a regular region and an escape region.
10. The adaptive variable-length decoding method of claim 9, wherein data of said escape region of said variable-length table selected in said variable-length-decoding step is decoded into data having variable or fixed run-length and level-length.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A semi-automatic sliding device of a sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing in a longitudinal direction, the sliding device comprising:
a first member;
a second member alternatively moving in a transverse or longitudinal direction of the first member while facing the first member;
a guide for guiding the movement of the second member in a transverse or longitudinal direction with regard to the first member; and
a ring shape elastic body rotatably coupled at opposite ends at its circumference to the first and second members and functioning as a semi-automatic driving source for driving the second member in the transverse or longitudinal directions,
wherein the ring shape elastic body exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape,
wherein the force drives the second member towards a fully extended state if the second member is in a substantially extended state in the transverse or longitudinal direction, and
wherein the force drives the second member towards a fully retracted state if the second member is in a substantially retracted state in the transverse or longitudinal direction.
2. The semi-automatic sliding device as claimed in claim 1, wherein the ring shape elastic body
is deformed during movement of the second member,
supplies a driving force to move the second member to an initial position when the second member moves by a distance shorter than a desired distance in the transverse or longitudinal direction, and
supplies driving force to move the second member to a termination position when the second member moves farther than the desired distance in the transverse or longitudinal direction.
3. The semi-automatic sliding device as claimed in claim 1, wherein the ring shape elastic body comprises:
a fixed end rotatably connected to the first member;
a movable end rotatably connected to the second member and moving along with the second member in the transverse or longitudinal direction of the first member; and
an elastic member disposed between the fixed end and the movable end and functioning as a semi-automatic driving source of the second member,
wherein the fixed end and the movable end are substantially symmetrically arranged around the ring shape elastic body,
wherein the fixed end, the movable end and the elastic member are integrally formed, and
wherein the ring shape elastic body exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape.
4. The semi-automatic sliding device as claimed in claim 3, wherein
the ring shape elastic body is deformed in an elliptical shape while supplying the driving force.
5. The semi-automatic sliding device as claimed in claim 1, wherein
an upper surface of the body housing functions as the first member, and
a bottom surface of the sliding housing functions as the second member.
6. A semi-automatic sliding device of a sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing in a longitudinal direction, the semi-automatic sliding device comprising:
a first member;
a second member;
coupling means for restricting the second member so that the second member moves while facing the first member;
guide means for guiding the movement of the second member in a transverse or longitudinal direction with regard to the first member; and
a ring shape elastic body rotatably coupled at opposite ends at its circumference to the first and second members and functioning as a semi-automatic driving source for driving the second member,
wherein the ring shape elastic body exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape,
wherein the force drives the second member towards a fully extended state if the second member is in a substantially extended state in the transverse or longitudinal direction, and
wherein the force drives the second member towards a fully retracted state if the second member is in a substantially retracted state in the transverse or longitudinal direction.
7. The semi-automatic sliding device as claimed in claim 6, wherein the coupling means comprises:
a fixed coupling member for fixing a first portion of the ring shape elastic body; and
a movable coupling member for moving a second portion of the ring shape elastic body.
8. The semi-automatic sliding device as claimed in claim 6, wherein the ring shape elastic body comprises:
a fixed end rotatably connected to the first member by the coupling means;
a movable end rotatably connected to the second member by the coupling means and moved along with the second member by the guide means in the transverse or longitudinal direction; and
an elastic member disposed between the fixed end and the movable end and functioning as a semi-automatic driving source for driving the second member.
9. The semi-automatic sliding device as claimed in claim 6,
wherein the guide means comprises a slot,
wherein the pathway comprises a first guide slot that extends substantially linearly in the transverse direction of the first member and a second guide slot that communicates with the first guide slot and extends substantially linearly in the longitudinal direction of the first member, and
wherein the first and second guide slots form an \u2018L\u2019 shape.
10. A semi-automatic sliding device of a sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing, the sliding device comprising:
a first member;
a second member;
coupling means for restricting the second member so that the second member moves while facing the first member;
guide means for guiding the movement of the second member on the first member in a predetermined direction; and
a ring shape elastic body rotatably coupled at opposite ends at its circumference to the first and second members, the ring shape elastic body supplying driving force to move the second member to a fully retracted position if the second member is in a substantially retracted position and supplying driving force to move the second member to a fully extended position if the second member is in a substantially extended position,
wherein the ring shape elastic body exerts the driving force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape, and
wherein the coupling means comprises a fixed coupling member for rotatably fixing a first portion of the ring shape elastic body; and a movable coupling member for rotatably moving a second portion of the ring shape elastic body.
11. The semi-automatic sliding device as claimed in claim 10, wherein the ring shape elastic body comprises:
a fixed end rotatably connected to the first member by the fixed coupling member;
a movable end rotatably connected to the second member by the movable coupling member; and
an elastic member disposed between the fixed end and the movable end and functioning as a semi-automatic driving source for driving the second member.
12. A sliding-type portable communication terminal comprising:
a body housing comprising a plurality of keys on an upper surface of the body housing;
a sliding housing comprising a display unit mounted on the upper surface of the body housing and sliding on the body housing in a longitudinal, first transverse, or second transverse direction, so as to open and close a desired region on the upper surface of the body housing; and
a three-directional sliding device for connecting the sliding housing to the body housing,
wherein the keys comprise first keys opened only after the sliding housing moves to a first fully open state from a fully closed state in the longitudinal direction or when sliding in the first transverse direction, second keys opened as the sliding housing slides to the first fully open state from the fully closed state in the longitudinal direction, when sliding in the first transverse direction, or as the sliding housing slides to a second fully open state from the fully closed state in the second transverse direction, and third keys opened only as the sliding housing moves to the second fully open state from the fully closed state in the second transverse direction or moves to a third fully open state from a partially closed state in first transverse direction,
wherein the first, second, and third keys comprise mutually exclusive keys, and
wherein the first keys and the second keys are positioned horizontally to each other, and the second keys and the third keys are positioned vertically to each other.
13. The sliding-type portable communication terminal as claimed in claim 12, wherein the three-directional sliding device operates semi-automatically by providing a driving force for driving the sliding housing towards a fully extended state if the sliding housing is in a substantially extended state in the first transverse, second transverse, or longitudinal direction, and for driving the sliding housing towards a fully retracted state if the sliding housing is in a substantially retracted state in the first transverse, second transverse, or longitudinal direction.
14. The sliding-type portable communication terminal as claimed in claim 13, wherein
the first transverse direction is substantially perpendicular to the longitudinal direction, and
the second transverse direction is substantially parallel with the first transverse direction and substantially perpendicular to the longitudinal direction.
15. A semi-automatic sliding device of a sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing, the sliding device comprising:
a first member;
a second member;
coupling means for restricting the second member so that the second member moves while facing the first member;
guide means for guiding the movement of the second member in a first transverse direction substantially perpendicular to a longitudinal direction, or a second transverse direction substantially parallel with the first transverse direction and substantially perpendicular to the longitudinal direction; and
a ring shape elastic body rotatably coupled at opposite ends at its circumference to the first and second members and functioning as a semi-automatic driving source for the sliding movement of the second member,
wherein the ring shape elastic body exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape,
wherein the force drives the second member towards a fully extended state if the second member is in a substantially extended state in the first transverse, second transverse, or longitudinal direction, and
wherein the force drives the second member towards a fully retracted state if the second member is in a substantially retracted state in the first transverse, second transverse, or longitudinal direction.
16. The semi-automatic sliding device as claimed in claim 15, wherein the ring shape elastic body comprises:
a fixed end rotatably connected to the first member by the coupling means;
a movable end rotatably connected to the second member by the coupling means and moved along with the second member by the guide means in the longitudinal, first transverse, or second transverse direction of the first member; and
an elastic member disposed between the fixed end and the movable end and functioning as a semi-automatic driving source for driving the second member.
17. The semi-automatic sliding device as claimed in claim 15, wherein the guide means comprises:
a first guide slot extending linearly in the longitudinal direction;
a second guide slot extending linearly in the first transverse direction; and
a third guide slot communicating with the first guide slot and extending linearly in the second transverse direction,
wherein the first, second and third guide slots comprise a \u2018\u2019 shape.
18. A semi-automatic sliding device of a sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing, the sliding device comprising:
a first member;
a second member;
coupling means for restricting the second member so that the second member moves while facing the first member;
guide means for guiding the movement of the second member in a first longitudinal direction, a second longitudinal direction substantially parallel with the first longitudinal direction, a first transverse direction substantially perpendicular to the first longitudinal direction, or a second transverse direction substantially perpendicular to the first longitudinal direction and substantially parallel with the first transverse direction of the first member; and
a ring shape elastic body rotatably coupled at opposite ends at its circumference to the first and second members and functioning as a semi-automatic driving source for the sliding movement of the second member,
wherein the ring shape elastic body exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape,
wherein the force drives the second member towards a fully extended state if the second member is in a substantially extended state in the first transverse, second transverse, first longitudinal, or second longitudinal direction, and
wherein the force drives the second member towards a fully retracted state if the second member is in a substantially retracted state in the first transverse, second transverse, first longitudinal, or second longitudinal direction.
19. A sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing to open and close the upper surface of the body housing while facing the body housing, the portable communication terminal comprising:
an upper surface of the body housing;
a bottom surface of the sliding housing;
guide means for guiding the movement of the sliding housing on the upper surface of the body housing in a transverse or longitudinal direction; and
a ring shape elastic body rotatably coupled at opposite ends at its circumference to the body housing and the sliding housing, disposed between the bottom surface of the body housing and the upper surface of the sliding housing to function as a semi-automatic driving source for the sliding movement of the sliding housing,
wherein the ring shape elastic body exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape,
wherein the force drives the sliding housing towards a fully extended state if the sliding housing is in a substantially extended state in the transverse or longitudinal direction, and
wherein the force drives the sliding housing towards a fully retracted state if the sliding housing is in a substantially retracted state in the transverse or longitudinal direction.
20. A semi-automatic sliding device of a sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing, the sliding device comprising:
a first member;
a second member sliding in a diagonal direction of the first member while facing the first member;
guide means for guiding the movement of the second member in the diagonal direction; and
a ring shape elastic member having a fixed end rotatably connected at a first opposite end at its circumference to the first member, a movable end rotatably connected at a second opposite end at its circumference to the second member and moved along with the second member by the guide means in the diagonal direction, and a semi-automatic driving source disposed between the fixed end and the movable end for driving the second member,
wherein the elastic member exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape,
wherein the force drives the second member towards a fully extended state if the second member is in a substantially extended state in the diagonal direction, and
wherein the force drives the second member towards a fully retracted state if the second member is in a substantially retracted state in the diagonal direction.
21. A semi-automatic sliding device of a sliding-type portable communication terminal comprising a body housing and a sliding housing sliding on the body housing, the sliding device comprising:
a first member;
a second member sliding along a curved guide slot while facing the first member;
guide means for guiding the movement direction of the second member; and
a ring shape elastic body having a fixed end rotatably connected at a first opposite end at its circumference to the first member, a movable end rotatably connected at a second opposite end at its circumference to the second member and moved together with the second member by the guide means along the curved guide slot, and the elastic body disposed between the fixed end and the movable end and functioning as a semi-automatic driving source for driving the second member,
wherein the ring shape elastic body exerts a force, when deformed, in a direction from a center of the ring shape towards a periphery of the ring shape,
wherein the force drives the second member towards a fully extended state if the second member is in a substantially extended state with respect to the curved guide slot, and
wherein the force drives the second member towards a fully retracted state if the second member is in a substantially retracted state with respect to the curved guide slot.
22. The semi-automatic sliding device as claimed in claim 21, wherein the guide means comprises a curved slot which is curved in a direction of approaching or departing away from the fixed end.