Image processing device and method using adaptive offset filter in units of largest coding unit

Abstract

Aspects of the present disclosure provide an image processing device that includes circuitry configured to perform a decoding process on an encoded stream for generating an image. The encoded stream is arranged into largest coding units (LCUs), and filtering parameters applicable to each LCU are provided at a beginning portion of the corresponding LCU. The circuitry is further configured to perform adaptive offset filtering on portions of the image that correspond to the LCUs using the filtering parameters set at the beginning portions of the LCUs, respectively.

1 . An image processing device comprising:
 processing circuitry configured to
 decode an encoded stream for generating an image, the encoded stream being arranged into largest coding units, LCUs, wherein filtering parameters of an adaptive offset filter applicable to each LCU are read from the beginning of the corresponding LCU; and 
 perform adaptive offset filtering on portions of the image that correspond to the LCUs using the filtering parameters of the adaptive offset filter read from the beginning of each respective LCU. 
   
     
     
         2 . The image processing device according to  claim 1 , wherein the filtering parameters of the adaptive offset filter include a type of the adaptive offset filter and an offset value. 
     
     
         3 . The image processing device according to  claim 2 , wherein the processing circuitry is further configured to
 perform deblocking filtering on the image generated by the decoding, and   perform adaptive offset filtering on an image on which a deblocking filter has performed deblocking filtering.   
     
     
         4 . The image processing device according to  claim 1 , wherein the processing circuitry is further configured to
 perform adaptive offset filtering on the image generated by the decoding in units of a largest coding unit using identification date identifying i) a parameter of a previous largest coding unit on which adaptive offset filtering has been performed before a current largest coding unit as being the same as a parameter of the current largest coding unit, ii) whether or not to use a parameter of a previous largest coding unit on which adaptive offset filtering has been performed before a current largest coding unit, or iii) whether or not to use a copy of a parameter of a previous largest coding unit on which adaptive offset filtering has been performed before a current largest coding unit.   
     
     
         5 . The image processing device according to  claim 1 , wherein the processing circuitry is further configured to
 perform adaptive offset filtering on the image generated by the decoding in units of a largest coding unit using identification data specifying a largest coding unit that is identical to a current largest coding unit in terms of a parameter, from within previous largest coding units on which adaptive offset filtering has been performed before the current largest coding unit.   
     
     
         6 . The image processing device according to  claim 1 , wherein the processing circuitry is further configured to
 perform a decoding process in units each having a hierarchical structure.   
     
     
         7 . An image processing method, comprising:
 performing, by an image processing device, a decoding process on an encoded stream for generating an image, the encoded stream being arranged into largest coding units, LCUs, wherein filtering parameters of an adaptive offset filter applicable to each LCU are read from the beginning of the corresponding LCU; and   performing, by the image processing device, adaptive offset filtering on portions of the image that correspond to the LCUs using the filtering parameters of the adaptive offset filter read from the beginning of each respective LCU.   
     
     
         8 . An image processing device, comprising:
 processing circuitry configured to   set filtering parameters of an adaptive offset filter at a beginning of a largest coding unit, which is a unit of transmission,   perform adaptive offset filtering on a decoded image which has been processed by a local decoding process by using the filtering parameters of the adaptive offset filter set during an encoding process of an image, and   perform an encoding process on the image on which the adaptive offset filter has performed adaptive offset filtering for generating an encoded stream, the encoded stream including the filtering parameters of the adaptive offset filter applicable to each largest coding unit set a a beginning of the largest coding unit.   
     
     
         9 . The image processing device according to  claim 8 , wherein the processing circuitry is further configured to
 perform deblocking filtering on a locally decoded image, wherein the adaptive offset filter is configured to perform adaptive offset filtering on the decoded image on which the deblocking filter has performed deblocking filtering.   
     
     
         10 . The image processing device according to  claim 8 , wherein the processing circuitry is further configured to
 set identification data identifying a parameter of a previous largest coding unit on which adaptive offset filtering has been performed before a current largest coding unit as being the same as a parameter of the current largest coding unit, and   transmit the set identification data and the generated encoded stream.   
     
     
         11 . The image processing device according to  claim 1 , wherein the processing circuitry is further configured to
 set identification data identifying whether or not to use a parameter of a previous largest coding unit on which adaptive offset filtering has been performed before a current largest coding unit, and   transmit the set identification data and the generated encoded stream.   
     
     
         12 . The image processing device according to  claim 8 , wherein the processing circuitry is further configured to
 transmit the parameters of the adaptive offset filter at timing of the beginning of a largest coding unit.   
     
     
         13 . The image processing device according to  claim 8 , wherein the processing circuitry is further configured to
 perform an encoding process in units each having a hierarchical structure.   
     
     
         14 . The image processing device according to  claim 8 , wherein the processing circuitry is further configured to
 transmit the generated encoded stream.   
     
     
         15 . An image processing method, comprising:
 setting filtering parameters of an adaptive offset filter at a beginning of a largest coding unit, which is a unit of transmission;   performing adaptive offset filtering on a decoded image, which has been processed by a local decoding process by using filtering parameters of the adaptive offset filter set during an encoding process of an image;   performing an encoding process on the image on which the adaptive offset filtering is performed; and   generating an encoded stream including the filtering parameters of the adaptive offset filter applicable to each largest coding unit set at a beginning of the largest coding unit.   
     
     
         16 . The method of  claim 15 , further comprising:
 performing deblocking filtering on a locally decoded image, wherein the adaptive offset filter performs adaptive offset filtering on the decoded image on which the deblocking filter has performed deblocking filtering.   
     
     
         17 . The method of  claim 15 , further comprising:
 setting identification data identifying a parameter of a previous largest coding unit on which adaptive offset filtering has been performed before a current largest coding unit as being the same as a parameter of the current largest coding unit; and   transmitting the set identification data and the generated encoded stream.   
     
     
         18 . The method of  claim 15 , further comprising:
 setting identification data identifying whether or not to use a parameter of a previous largest coding unit on which adaptive offset filtering has been performed before a current largest coding unit; and   transmitting the set identification data and the generated encoded stream.   
     
     
         19 . The method of  claim 15 , further comprising:
 performing an encoding process in units each having a hierarchical structure.   
     
     
         20 . The method of  claim 15 , further comprising:
 transmitting the parameters of the adaptive offset filter set by the setting unit at a timing of the beginning of a largest coding unit.