Image processing device, image processing method, and program

Abstract

[Object] To prevent an inappropriate processing parameter from being used in a case in which an image that may be expressed by various expression methods is handled.[Solution] Provided is an image processing device including: a control unit that decides a processing parameter for image processing performed on an image on the basis of at least one of a transfer function related to conversion between light and an image signal that is applied to the image or a color range that is applied to the image; and a processing unit that executes the image processing using the processing parameter that is decided by the control unit.

1 . An image processing device comprising:
 a control unit that decides a processing parameter for image processing performed on an image on a basis of at least one of a transfer function related to conversion between light and an image signal that is applied to the image or a color range that is applied to the image; and   a processing unit that executes the image processing using the processing parameter that is decided by the control unit.   
     
     
         2 . The image processing device according to  claim 1 , wherein the control unit decides the processing parameter on a basis of a combination of the transfer function and the color range. 
     
     
         3 . The image processing device according to  claim 1 , wherein the control unit decides the processing parameter such that influences of a change in a code value of an image signal due to a difference in the at least one of the transfer function or the color range on the image processing are canceled. 
     
     
         4 . The image processing device according to  claim 1 ,
 wherein the processing unit executes quantization processing on a partial region in a quantization step that is adjusted in accordance with a coding difficulty of each partial region of the image, and   the processing parameter is a parameter related to the quantization processing.   
     
     
         5 . The image processing device according to  claim 4 , wherein the parameter related to the quantization processing includes an adjustment gain of the quantization step for the image. 
     
     
         6 . The image processing device according to  claim 5 , wherein the control unit decides a basic adjustment gain of the quantization step for the image on a basis of the at least one of the transfer function or the color range. 
     
     
         7 . The image processing device according to  claim 6 , wherein the processing unit executes the quantization processing on each partial region in a quantization step after adjustment in which the quantization step is adjusted on a basis of the basic adjustment gain and the coding difficulty of each partial region. 
     
     
         8 . The image processing device according to  claim 1 , wherein the processing unit executes pixel classification processing on the image using the processing parameter. 
     
     
         9 . The image processing device according to  claim 8 , wherein the processing parameter includes a threshold value to be compared with a code value of a color component in the pixel classification processing. 
     
     
         10 . The image processing device according to  claim 9 ,
 wherein the pixel classification processing includes region detection processing for detecting a specific region in the image, and   the threshold value includes a region detection threshold value.   
     
     
         11 . The image processing device according to  claim 10 ,
 wherein the specific region is a region of a specific color, and   the region detection threshold value includes a color determination threshold value.   
     
     
         12 . The image processing device according to  claim 11 ,
 wherein the specific color is a skin color, and   the color determination threshold value includes a skin color determination threshold value.   
     
     
         13 . The image processing device according to  claim 12 , further comprising a quantization unit that executes quantization processing on the image in a quantization step that is adjusted on a basis of a result of the region detection processing. 
     
     
         14 . The image processing device according to  claim 1 , further comprising a storage unit that stores a value of the processing parameter associated with one or both of the transfer function and the color range. 
     
     
         15 . The image processing device according to  claim 1 , wherein the control unit determines a type of the at least one of the transfer function and the color range on a basis of input information related to the at least one of the transfer function or the color range and decides the processing parameter for the image processing on a basis of the determined type. 
     
     
         16 . The image processing device according to  claim 15 , wherein the input information is information acquired via a user interface. 
     
     
         17 . The image processing device according to  claim 15 , wherein the input information is information acquired from an auxiliary signal that is multiplexed with an input image signal that expresses the image. 
     
     
         18 . An image processing method comprising:
 deciding a processing parameter for image processing performed on an image on a basis of at least one of a transfer function related to conversion between light and an image signal that is applied to the image or a color range that is applied to the image; and   executing the image processing using the decided processing parameter.   
     
     
         19 . A program that causes a processor of an image processing device to function as:
 a control unit that decides a processing parameter for image processing performed on an image on a basis of at least one of a transfer function related to conversion between light and an image signal that is applied to the image or a color range that is applied to the image; and   a processing unit that executes the image processing using the processing parameter that is decided by the control unit.