Image processing device and method

Abstract

An image processing device and method capable of suppressing block noise. A β LUT_input calculation unit and a clipping unit calculate β LUT_input that is a value input to an existing β generation unit and an extended β generation unit. When the value of β LUT_input qp from the clipping unit is equal to or less than 51, the existing β generation unit calculates β using the LUT defined in the HEVC method and supplies the calculated β to a filtering determination unit. When the value of β LUT_input qp from the clipping unit is larger than 51, the extended β generation unit calculates extended β and supplies the calculated β to the filtering determination unit. The device can be applied to an image processing device, for example.

1 . An image processing device, comprising:
 a decoding unit that generates an image by decoding an encoded stream; and   a filter unit that performs filtering of a filter using a parameter, which is obtained by extending a range of a filter parameter for controlling the filter so as to increase a filter strength, with a block boundary of the image generated by the decoding unit as a target.   
     
     
         2 . The image processing device according to  claim 1 ,
 wherein the range of the filter parameter is extended so as to increase the filter strength of the filter in a state of being consistent with an existing range.   
     
     
         3 . The image processing device according to  claim 2 ,
 wherein the range of the filter parameter is adjusted so as to be continuous in an existing portion and an extended portion.   
     
     
         4 . The image processing device according to  claim 1 ,
 wherein the range of the filter parameter is extended by adding a new filter parameter.   
     
     
         5 . The image processing device according to  claim 1 ,
 wherein the filter parameter is a threshold value used when determining whether or not to perform the filtering.   
     
     
         6 . The image processing device according to  claim 5 ,
 wherein the filter is a deblocking filter, and   the filter parameter is a parameter used when determining whether or not the deblocking filter is required or when determining strength selection.   
     
     
         7 . The image processing device according to  claim 6 ,
 wherein the range of the filter parameter is extended in a linear shape.   
     
     
         8 . The image processing device according to  claim 7 ,
 wherein an inclination of the linear shape is adjustable.   
     
     
         9 . The image processing device according to  claim 6 ,
 wherein the range of the filter parameter is extended in a curved line.   
     
     
         10 . The image processing device according to  claim 5 ,
 wherein the filter is a deblocking filter, and   the filter parameter is a parameter used when determining strength selection of the deblocking filter or used in clipping when performing filtering of the filter.   
     
     
         11 . The image processing device according to  claim 5 ,
 wherein the filter unit performs filtering of the filter using a parameter, which is extended by updating a table using an inclination of a computational expression that expresses the filter parameter, with a block boundary of the image generated by the decoding unit as a target.   
     
     
         12 . The image processing device according to  claim 5 ,
 wherein the filter unit performs filtering of the filter using a parameter, which is extended by adding an offset of the filter parameter to the filter parameter, with a block boundary of the image generated by the decoding unit as a target.   
     
     
         13 . The image processing device according to  claim 5 ,
 wherein the filter parameter includes two types of parameters that use a common offset, and   a parameter calculation unit that calculates the two types of parameters using the common offset is further provided.   
     
     
         14 . The image processing device according to  claim 5 ,
 wherein the filter parameter includes two types of parameters, and   a first parameter calculation unit, which calculates a first filter parameter using an offset of a first parameter, and a second filter parameter calculation unit, which calculates a second filter parameter using the offset of the first parameter, a difference between the first and second filter parameters, and an offset of the second parameter, are further provided.   
     
     
         15 . The image processing device according to  claim 1 ,
 wherein the filter is a deblocking filter.   
     
     
         16 . The image processing device according to  claim 1 ,
 wherein the filter is an adaptive offset filter.   
     
     
         17 . The image processing device according to  claim 1 ,
 wherein the decoding unit decodes the encoded stream in a processing unit having a hierarchical structure.   
     
     
         18 . An image processing method of an image processing device, comprising:
 generating an image by decoding an encoded stream; and   performing filtering of a filter using a parameter, which is obtained by extending a range of a filter parameter for controlling the filter so as to increase a filter strength, with a block boundary of the generated image as a target.   
     
     
         19 . An image processing device, comprising:
 a filter unit that performs filtering of a filter using a parameter, which is obtained by extending a range of a filter parameter for controlling the filter so as to increase a filter strength, with a block boundary of a locally decoded image as a target;   an encoding unit that generates an encoded stream by encoding the image using the image subjected to the filtering of the filter by the filter unit; and   a transmission unit that transmits the encoded stream generated by the encoding unit.   
     
     
         20 . An image processing method of an image processing device, comprising:
 performing filtering of a filter using a parameter, which is obtained by extending a range of a filter parameter for controlling the filter so as to increase a filter strength, with a block boundary of a locally decoded image as a target;   generating an encoded stream by encoding the image using the image subjected to the filtering of the filter; and   transmitting the generated encoded stream.