Patent application number | Description | Published |
20100213712 | WIND TURBINE GENERATOR - An object is to improve the operating rate. A first switch is provided in a power line connecting a power generator to a power system, and a second switch that can be opened and closed by remote control is provided in the power line between the power generator and the first switch. In the second switch, a withstand current capability is set that allows current flowing in a low-voltage event and that withstands current having a value equal to or less than a current value specified by the thermal setting of the power generator. In the first switch, a withstand current capability is set that is superior to the withstand current capability of the second switch and that withstands current having a value equal to or less than the current value specified by the thermal setting of the power generator. | 08-26-2010 |
20100250012 | WIND-POWER GENERATION SYSTEM AND OPERATION CONTROL METHOD THEREFOR - An object is to improve the accuracy of power factor adjustment. Power-factor command values corresponding to individual wind turbines are determined by correcting a predetermined power-factor command value for an interconnection node using power factor correction levels set for the individual wind turbines. | 09-30-2010 |
20110074152 | WIND TURBINE GENERATOR AND METHOD OF CONTROLLING THE SAME - In a case where a request for changing a maximum value of active power and a newly defined maximum value of active power are received from the utility grid side, a maximum value of an active power demand value set to a rated value is changed to the newly defined maximum value of active power at a predetermined change rate or less. | 03-31-2011 |
20110077787 | WIND TURBINE GENERATOR, METHOD OF CONTROLLING THE SAME, AND WIND TURBINE GENERATING SYSTEM - Damage is prevented on electric devices in a case where a generator is installed in a cold weather. A wind turbine generator includes a power supply unit connected to a utility grid via a switch gear; a utility grid voltage measuring unit provided between the power supply unit and the utility grid, for measuring a voltage of the utility grid; and a temperature measuring unit for obtaining an ambient temperature of the power supply unit. In a case where a measurement value of the temperature measuring unit or an ambient temperature of the power supply unit estimated based on the measurement value is smaller than a first temperature threshold determined based on a function guarantee temperature of the power supply unit and the voltage measured by the utility grid voltage measuring unit is smaller than a preset voltage threshold, the switch gear operates to interrupt the connection between the power supply unit and the utility grid. | 03-31-2011 |
20110112697 | WIND TURBINE GENERATOR SYSTEM AND OPERATION CONTROL METHOD THEREFOR - An object is to improve the accuracy of reactive power adjustment. Reactive-power command values corresponding to individual wind turbines are determined by correcting a predetermined reactive-power command value for an interconnection node A using reactive power correction levels set for the individual wind turbines. | 05-12-2011 |
20110156388 | WIND TURBINE GENERATOR SYSTEM - It is an object to provide a wind turbine generator system that can promptly restore the system voltage in the event of, for example, a low voltage phenomenon. A controller | 06-30-2011 |
20110204630 | WIND POWER GENERATION SYSTEM AND OPERATION CONTROL METHOD THEREOF - The object is to reduce an output fluctuation in an interconnection node. Provided is an operation control method of a wind power generation system including a step of obtaining the output data of each wind turbine, a step of determining a correlation between output fluctuations of adjacent wind turbines by using output data, and a step of shifting, if a strong correlation is exhibited, a phase of output fluctuation of either one of the adjacent wind turbines by a period at which the strong correlation is exhibited. | 08-25-2011 |
20110291414 | WIND POWER GENERATION SYSTEM AND METHOD OF CONTROLLING THE SAME - Provided is a wind power generation system intending to suppress an increase of torque when a voltage in a utility grid is restored, and to reduce a load to devices due to the torque. The blade control unit controls the pitch angle of the wind turbine blades such that a rotation speed of the power generator becomes equal to or greater than a synchronous rotation speed when the power control unit de-actuates the operations of the converter and the inverter, and controls the pitch angle of the wind turbine blades such that the pitch angle matches a target pitch angle that is determined based on one of a wind speed, a rotation speed of the power generator, and a requested output power when the power control unit re-actuates the operations of the converter and the inverter. | 12-01-2011 |
20110320052 | UTILITY GRID STABILIZATION APPARATUS AND METHOD,AS WELL AS WIND POWER GENERATING SYSTEM - It is an object to supply stable reactive power without requiring large-scale civil engineering work. The invention provides a utility grid stabilization apparatus to be applied to a generating system including a generator having a squirrel-cage induction generator to generate electric power using natural energy and a connection switching section provided between the generator and a utility grid to switch between connection and disconnection of the generator and the utility grid to and from each other, the apparatus including a reactive power regulating section for supplying or absorbing reactive power to or from the utility grid when voltage of the utility grid satisfies a preset variation condition and the generator is disconnected from the utility grid. | 12-29-2011 |
20120286510 | WIND POWER GENERATION SYSTEM AND METHOD OF CONTROLLING THE SAME - Provided is a wind power generation system intending to suppress an increase of torque when a voltage in a utility grid is restored, and to reduce a load to devices due to the torque. The blade control unit controls the pitch angle of the wind turbine blades such that a rotation speed of the power generator becomes equal to or greater than a synchronous rotation speed when the power control unit de-actuates the operations of the converter and the inverter, and controls the pitch angle of the wind turbine blades such that the pitch angle matches a target pitch angle that is determined based on one of a wind speed, a rotation speed of the power generator, and a requested output power when the power control unit re-actuates the operations of the converter and the inverter. | 11-15-2012 |
Patent application number | Description | Published |
20110140428 | MONITORING AND CONTROL APPARATUS AND METHOD AND WIND POWER PLANT EQUIPPED WITH THE SAME - It is an object to reduce influence on a utility grid by reducing a rapid change in active power, and to extend the life of a wind power plant while controlling active power output in response to a request from the utility grid. A monitoring and control apparatus applied to a wind power plant including a plurality of wind turbine generators includes an electric power control unit that controls the wind turbine generators so as to reduce output of the wind power plant in a stepwise manner, when an active power reduction request from a utility grid side is output. | 06-16-2011 |
20110166717 | Real power control in wind farm - A method is provided for controlling real powers supplied from a plurality of wind farms each provided with a plurality of wind turbine generators to the utility grid. The method includes: performing control for reducing real powers supplied from a plurality of wind farms to a utility grid, down to limit values set for the respective wind farms, in response to increase in a grid frequency of the utility grid; and increasing the real power supplied from a first wind farm out of the plurality of wind farms to the utility grid than the limit value set for the first wind farm when the real power actually supplied from a second wind farm out of the plurality of wind farms to the utility grid does not reach the limit value set for the second wind farm. | 07-07-2011 |
20110198846 | VARIABLE-SPEED POWER GENERATOR AND METHOD OF CONTROLLING THE SAME - Reactive power is supplied in accordance with a reactive-power supply instruction from a power grid while ensuring a variable-speed range of a wound-rotor induction generator. A variable-speed power generator includes a prime mover that generates motive power by using natural energy; an electric generator that includes a stator having a primary winding and a rotor having a secondary winding, the stator and the rotor being connected to a power grid, and that generates electric power based on the motive power generated by the prime mover; and a power converter connected to the stator and the rotor, wherein the power converter does not supply reactive power to the power grid, and wherein the variable-speed power generator includes a power-converter controller that causes the electric generator to operate at a rotation speed set to be higher than or equal to a synchronous speed and increases reactive power supplied to the power grid when a reactive-power supply instruction for supplying reactive power to the power grid is obtained from the power grid. | 08-18-2011 |
20110227343 | WIND POWER PLANT AND WIND-POWER-PLANT CONTROL METHOD - A wind power plant includes a wind turbine generator and an electrical storage device that supply electric power to a utility grid. A wind-turbine controller performs for the wind turbine generator an acoustic-noise suppression operation in which the rotational speed of blades is controlled in order to suppress acoustic noise, and also calculates a reduction in output power that is the difference in output power between the normal output power and the acoustic-noise-suppression output power. An electrical-storage-device controller causes the electrical storage device to be charged or discharged, based on the reduction in output power, the acoustic-noise-suppression output power, and the grid-demanded output power demanded from the utility grid. Therefore, the wind power plant can supply, to the utility grid, the electric power demanded from the utility grid even when the operation of suppressing the occurrence of acoustic noise is performed for the wind turbine generator. | 09-22-2011 |
20110309804 | CONTROL DEVICE OF WIND TURBINE GENERATOR AND CONTROL METHOD THEREOF - A control device of a wind turbine generator capable of controlling an active power based on an instruction value, includes a measurement means configured to measure a frequency of a utility grid. The instruction value for controlling the active power is generated to a direction suppressing a variation of the frequency of the utility grid based on conversion information which indicates a predetermined relation between the variation of the frequency and the instruction value when the variation of the frequency of the utility grid measured by the measurement means exceeds a predetermined standard. A wind turbine generator which controls suppression of a disturbance of a grid in its initial stage is realized. | 12-22-2011 |
20120061959 | OUTPUT CONTROL METHOD AND OUTPUT CONTROL UNIT FOR WIND POWER PLANT - A control method for a wind turbine generator and storage battery unit connected to a power grid in parallel, includes calculating total active power and total reactive power, and switching between: a first mode in which the generator outputs turbine required active power and reactive power that can be outputted by the generator and the battery unit outputs battery required active power and battery required reactive power which correspond to a difference between the total active power and the turbine required active power and a difference between the total reactive power and the turbine required reactive power respectively; and a second mode in which the battery required active power is maintained and the battery required reactive power is reduced while the turbine reactive power is increased by an amount of the reduction of the battery required reactive power wherein apparent power exceeds a set battery unit apparent power. | 03-15-2012 |
20120061960 | WIND TURBINE GENERATOR SYSTEM AND WIND TURBINE GENERATOR - An object of the present invention is to make use of wind energy as effectively as possible and increase the amount of generated energy that is supplied to a power system. A power storage apparatus is interposed between and electrically connected to a wind turbine generator and a power system. The wind turbine generator outputs, to the power system side, an amount of active power obtained by subtracting auxiliary machine loss, which is power consumed by an auxiliary machine, from the maximum active power that can be output by a generator, and if the amount of active power output from the wind turbine generator exceeds a limited power value set for the power transmission end, a charge/discharge controller that controls the power storage apparatus causes the power storage apparatus to be charged with part of the power output from the wind turbine generator. | 03-15-2012 |
20120061961 | WIND TURBINE GENERATOR AND METHOD OF CONTROLLING THE SAME - An object of the present invention is to, if a frequency decrease has occurred in a power system, avoid a trip in a wind turbine generator and reliably contribute to recovery of the frequency of the power system. The present invention provides a wind turbine generator that, if a predetermined frequency decrease that requires PFR has occurred in the power system, calculates a marginal active power based on the difference between a predetermined rotational speed lower limit value, which is obtained by providing the parallel-off rotational speed with a predetermined margin, and a measured value of the shaft rotational speed, and generates an active power command value based on the marginal active power. | 03-15-2012 |
20120104753 | CONTROL SYSTEM OF WIND POWER GENERATOR, WIND FARM, AND METHOD FOR CONTROLLING WIND POWER GENERATOR - A wind power generator generates power through a rotation of a rotor and is interconnected, and operated with its power generation output previously limited in order to be able to further supply the power to a power system in response to a decrease in system frequency. Thus, a concentrated control system derives a required restricted amount corresponding to a power generation output required to respond to the decrease in system frequency, derives a value by subtracting an amount corresponding to a latent power generation output with which the power generation output can be increased, from the required restricted amount, and sets a restricted amount of the power generation output in each wind power generator to perform the operation with the power generation output previously limited to respond to the decrease in system frequency, based on the above value. | 05-03-2012 |
20120104755 | WIND FARM CONTROL SYSTEM, WIND FARM, AND WIND FARM CONTROL METHOD - To prevent disconnection of wind turbine generators due to changes in wind conditions even if the wind turbine generators is operated to limit the power output. A plurality of wind turbine generators that generate electric power by the rotation of rotors are provided in a wind farm are interconnected and are operated while the power outputs are limited in advance so as to be able to further supply electric power to a utility grid in response to a decrease in the frequency or voltage of the utility grid. The rotational speed of the rotor, which is a physical quantity related to increase and decrease in the power output of the wind turbine generator, is measured for each of the wind turbine generators by a wind-turbine control system, and the limitation amount of the power output of the wind turbine generator is set for each of the wind turbine generators by a central control system on the basis of the rotational speed of the rotor measured. | 05-03-2012 |
20120133132 | WIND-POWER-STATION CONTROL APPARATUS AND WIND-POWER-STATION CONTROL METHOD - A wind-power-station control apparatus is provided in a wind power station having a plurality of wind turbine generators. To reduce the electrical power supplied from the wind power station to the utility grid, the wind-power-station control apparatus performs, for a wind turbine generator whose actual output electrical power is small relative to the maximum electrical power that can be output, among the plurality of wind turbine generators, output-power reduction control for reducing the output power thereof and increasing the rotational speed of the rotor thereof. Thus, even when control for reducing the output power is performed for the wind turbine generator, it is possible to suppress waste of the wind energy received by the blades and to increase the total annual amount of generated electrical power. | 05-31-2012 |
20120205912 | WIND-TURBINE-GENERATOR CONTROL APPARATUS, WIND TURBINE GENERATOR SYSTEM, AND WIND-TURBINE-GENERATOR CONTROL METHOD - A wind-turbine control device controls a wind turbine generator in which a rotor having a plurality of blades receives wind and rotates. The generator generates electrical power through the rotation of the rotor. The electrical power is supplied to a utility grid, and electric energy to be supplied to the utility grid can be changed according to a change in the frequency of the utility grid. The wind-turbine control device includes a subtracter to calculate a frequency change, which is the difference between a measurement value of the frequency of generated output power of the wind turbine generator and a set value of the frequency of the generated output power of the wind turbine generator. The wind-turbine control device further includes a limiter to limit a change in the electrical power corresponding to the frequency change calculated by the subtracter, based on the rotational speed of the generator. | 08-16-2012 |
20120248772 | CONTROL DEVICE OF WIND TURBINE GENERATOR, WIND TURBINE GENERATOR, WIND FARM, AND CONTROL METHOD FOR WIND TURBINE GENERATOR - An object is to rapidly recover from a voltage drop in a power grid. When the value of a grid voltage detected by a grid voltage detection unit has fluctuated so as to satisfy a condition set in advance for a reference value, a control device controls a wind turbine generator such that a reactive current corresponding to a required output current that is determined by an active current and the reactive current and that indicates an output level to a power grid on the basis of the detection result from the grid voltage detection unit is output to the power grid. | 10-04-2012 |
20120261919 | CONTROL SYSTEM OF WIND POWER GENERATOR, WIND FARM, AND METHOD FOR CONTROLLING WIND POWER GENERATOR - A wind power generator generates power through a rotation of a rotor and is interconnected, and operated with its power generation output previously limited in order to be able to further supply the power to a power system in response to a decrease in system frequency. Thus, a concentrated control system derives a required restricted amount corresponding to a power generation output required to respond to the decrease in system frequency, derives a value by subtracting an amount corresponding to a latent power generation output with which the power generation output can be increased, from the required restricted amount, and sets a restricted amount of the power generation output in each wind power generator to perform the operation with the power generation output previously limited to respond to the decrease in system frequency, based on the above value. | 10-18-2012 |
20120265356 | POWER OUTPUT LEVELING METHOD AND APPARATUS FOR WIND TURBINE GENERATING FACILITY - It is intended to provide a method and an apparatus for leveling power output of a wind turbine generator facility as well as increasing power output. The power output leveling apparatus | 10-18-2012 |
20130001955 | VARIABLE-SPEED POWER GENERATOR AND METHOD OF CONTROLLING THE SAME - A variable-speed power generator includes a prime mover that generates motive power by using natural energy; a wound-rotor induction generator that includes a stator having a primary winding and a rotor having a secondary winding, which are connected to a power grid, the generator generating electric power based on the motive power generated by the prime mover; a power converter connected to the stator and the rotor; and a controller controlling wound-rotor induction generator. The controller responds to instructions, sent by the power grid, for supplying reactive power to the power grid. The response of the controller to an instruction for supplying reactive power to the power grid may include imposing limitations on the reactive power supplied by the power converter to the power grid and causing the wound-rotor induction generator to operate at a rotation speed set higher than or equal to a synchronous speed. | 01-03-2013 |
20130119660 | WIND-POWER GENERATION SYSTEM AND CONTROL METHOD FOR THE SAME - An object is to reduce a decrease in the amount of electric power supplied due to the occurrence of a gust of wind during an output-power limiting operation. Provided is a wind-power generation system in which, in the case where an output-power limiting operation for decreasing the grid frequency is performed, when at least one wind turbine is disconnected depending on the wind conditions, the output power of the other wind turbines in operation is increased. | 05-16-2013 |
20130144450 | GENERATOR SYSTEM - An object is to provide a generator system capable of reducing short-period and long-period output power variations. Provided is a generator system including a pumped-storage power generation facility for leveling a long-period output power variation in a wind turbine; a power storage facility for leveling a short-period output power variation in the wind turbine; and a central control unit that gives control instructions to the wind turbine, the pumped-storage power generation facility, and the power storage facility. | 06-06-2013 |
20130187385 | WIND-TURBINE-GENERATOR CONTROL SYSTEM, WIND TURBINE GENERATOR, WIND FARM, AND WIND-TURBINE-GENERATOR CONTROL METHOD - A turbine controller of a wind turbine generator includes a generated-output-power command value creating section that creates a generated-output-power command value and an optimum-upper-and-lower-limit limiting section that limits the generated-output-power command value by means of an upper limit value and a lower limit value of the generated output power that are determined based on a power curve indicating the relationship between the generated output power and the rotational speed of the generator. Furthermore, the turbine controller includes a limit-value creating section that creates, when the grid frequency is increased above a predetermined reference frequency, a frequency-dependent limit value serving as an upper limit value of the generated-output-power command value, according to the increase in grid frequency; and a first upper-limit limiting section that limits the upper limit value of the generated-output-power command value limited by the optimum-upper-and-lower-limit limiting section, by means of the frequency-dependent limit value. | 07-25-2013 |
20130221669 | WIND TURBINE CONTROL DEVICE AND METHOD FOR REDUCING FLUCTUATION OF GRID FREQUENCY WHEN GRID DISTURBANCE OCCURS, AND WIND TURBINE GENERATOR SYSTEM THEREOF - When a grid disturbance occurs, output power control is performed for each wind turbine so as to reduce fluctuation of a frequency of an output power of the wind turbine at an early stage of the grid disturbance. The output power control is performed for each wind turbine so as to reduce fluctuation of a grid frequency at an interconnection point, in a late stage of the grid disturbance. | 08-29-2013 |
20130221670 | WIND TURBINE GENERATOR SYSTEM, CONTROL APPARATUS THEREFOR, AND CONTROL METHOD THEREFOR - An object is to swiftly respond to a demand made in terms of electric energy from the grid side when an output-power reduction operation is performed. A wind-turbine-generator-system control apparatus includes: an output-power predicting section that estimates a future output-power prediction curve from wind-condition prediction information indicating predicted future wind conditions; and a first setting section that divides the output-power prediction curve into a predetermined number of time segments and sets, for each of the time segments, a first target electric-power value for making reserve electric energy in the corresponding time segment match demand reserve electric energy demanded by the grid side. The output power of each of the wind turbines is controlled based on the first target electric-power value. | 08-29-2013 |
20130221671 | WIND TURBINE GENERATOR SYSTEM, CONTROL APPARATUS THEREFOR, AND CONTROL METHOD THEREFOR - In a control apparatus for a wind turbine generator system, a wind turbine classifying unit classifies a plurality of wind turbines into a first wind turbine group that does not satisfy a rated wind speed condition and a second wind turbine group that satisfies the rated wind speed condition. A first controlling unit releases, for the wind turbines of the first wind turbine group, the output power reducing operation and causes the wind turbines of the first wind turbine group to perform an output power corresponding to a wind condition. A second controlling unit supplements a first deviation, which is a difference between a total output power of the first wind turbine group and a target output power, with an output power from the wind turbine of the second wind turbine group. | 08-29-2013 |
20130234436 | OUTPUT CONTROL APPARATUS AND OUTPUT CONTROL METHOD FOR WIND TURBINE - An output control apparatus for a wind turbine, including an output difference calculation unit; a maximum output rate setting unit; an output command value calculation unit; and an output control unit, wherein the maximum output rate setting unit is configured so that the larger an absolute value of the difference is, the higher the maximum output rate is set at least in a range that the absolute value of the difference is not greater a threshold value. | 09-12-2013 |
20140117948 | VOLTAGE CONTROL APPARATUS, CONTROL METHOD THEREFOR, AND VOLTAGE CONTROL PROGRAM THEREFOR - Provided are a control-amount separating section that separates, when it is determined that an interconnection-point voltage (Vr) at an interconnection point where a wind turbine is connected to a utility grid deviates from a target value, a target control amount for reactive power for matching the interconnection-point voltage (Vr) with the target value into a first control amount serving as a control amount for reactive power that is caused by a fluctuation in active power at the interconnection point and a second control amount serving as a control amount for reactive power that is caused by a change in a power flow in the utility grid; a wind-turbine control device that controls the switching device on the basis of the first control amount; and a capacitor-bank control device that controls the capacitor bank on the basis of the second control amount. | 05-01-2014 |
20140152105 | OUTPUT CONTROL DEVICE AND OUTPUT CONTROL METHOD FOR WIND FARM - An output control device for a wind farm which includes n number of wind turbines includes a WTG output obtaining unit for obtaining a current output P | 06-05-2014 |
20140284927 | WIND TURBINE GENERATOR, METHOD OF WIND TURBINE GENERATION, AND PROGRAM OF THE WIND TURBINE GENERATOR - When a low voltage event occurs in a utility grid, a load on a spindle system is repressed so that a damage is prevented. A rotor having a plurality of wind turbine blades, a generator to be driven by rotation of the rotor, and a pitch angle controller for controlling a pitch angle of the wind turbine blade according to a generator speed are provided, and when a voltage of a utility grid is a predetermined value or less, the pitch angle controller controls the pitch angle so that torsional vibration generated on a spindle system for transmitting the rotation of the rotor to a generator system is repressed. | 09-25-2014 |
Patent application number | Description | Published |
20120213278 | MOVING IMAGE CODING DEVICE, MOVING IMAGE DECODING DEVICE, MOVING IMAGE CODING/DECODING SYSTEM, MOVING IMAGE CODING METHOD AND MOVING IMAGE DECODING METHOD - A frequency transformation determination unit determines whether a plurality of adjacent transformation target regions with the partition boundary interposed therebetween are integrated or not. A transformation coefficient generation unit generates, by applying one frequency transformation, a transformation coefficient for the transformation target regions where the frequency transformation determination unit determined to integrate. | 08-23-2012 |
20120251012 | IMAGE FILTER, ENCODING DEVICE, DECODING DEVICE, AND DATA STRUCTURE - An image filter ( | 10-04-2012 |
20120300849 | ENCODER APPARATUS, DECODER APPARATUS, AND DATA STRUCTURE - An encoding device of the present embodiment includes: an adaptive filter ( | 11-29-2012 |
20130058410 | ENCODING DEVICE, DECODING DEVICE, AND DATA STRUCTURE - A video encoding device includes a side information determination section and a side information encoding section. The side information determination section sets a quantization parameter for each macroblock in such a manner that a difference between quantization parameters for each pair of macroblocks with successive encoding orders is equal to one of n difference values, and transforms the difference into one of n indices with respect to each pair. The side information encoding section generates a binary sequence having a length corresponding to the size of the absolute value of the index. The total of absolute values of the n indices is smaller than the total of absolute values of the n difference values. | 03-07-2013 |
20130121414 | IMAGE INTRA-PREDICTION MODE ESTIMATION DEVICE, IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE, AND ENCODED IMAGE DATA - A coding device and a decoding device are configured to include an estimated prediction mode deciding section ( | 05-16-2013 |
20140140416 | OFFSET DECODING DEVICE, OFFSET CODING DEVICE, IMAGE FILTERING DEVICE, AND DATA STRUCTURE - An adaptive offset filter ( | 05-22-2014 |
20140307801 | ARITHMETIC DECODING DEVICE, IMAGE DECODING DEVICE, ARITHMETIC CODING DEVICE, IMAGE CODING DEVICE, AND ARITHMETIC DECODING METHOD - The amount of processing is reduced with high coding efficiency maintained. There is provided an arithmetic decoding device including syntax decoding means for decoding each of at least a first syntax element and a second syntax element indicating a transform coefficient using arithmetic decoding with a context or arithmetic decoding without a context. The syntax decoding means performs decoding that at least includes not decoding the first syntax element and decoding the second syntax element using the arithmetic decoding without a context, and decoding the first syntax element using the arithmetic decoding with a context and decoding the second syntax element using the arithmetic decoding without a context. | 10-16-2014 |
20140348247 | ARITHMETIC DECODING DEVICE, IMAGE DECODING DEVICE, AND ARITHMETIC CODING DEVICE - To reduce the amount of processing related to coding and decoding of transform coefficients, a sub-block coefficient presence/absence flag indicating whether or not at least one non-zero transform coefficient is included is decoded for each of two or more sub-blocks obtained by dividing a unit region, and a context index of a target sub-block is derived on the basis of transform coefficient presence/absence flags each indicating whether or not a transform coefficient is 0. In accordance with the sub-block coefficient presence/absence flags of adjacent sub-blocks that are adjacent to the target sub-block, the context index of the target sub-block is derived. | 11-27-2014 |
20150222914 | IMAGE DECODING DEVICE AND IMAGE CODING DEVICE - A reference picture information decoding unit ( | 08-06-2015 |
20150245046 | IMAGE DECODING DEVICE - An image decoding device is equipped with a header information decoding means for decoding profile/level information included in a video parameter set after decoding byte-aligned 16-bit extension information (next_essential_info_byte_offset) in the video parameter set. | 08-27-2015 |