Control device, control method, and display system

Abstract

A control device that executes a local dimming process of a display, the control device, includes a memory; and a processor configured to execute a process including identifying a changed area in which an image is changed in a frame to be displayed on the display, analyzing, in a case where the changed area is identified, every time a frame to be displayed on the display is received, the image in the changed area in the received frame, in a corresponding one of first units for processing so that the image in the changed area is analyzed in the first units for processing over multiple frames by time division processing, and generating control information for controlling the local dimming process for a corresponding area on the display, every time an analysis result with respect to the image in the first unit of processing is output.

What is claimed is: 
     
         1 . A control device that executes a local dimming process of a display, the control device comprising:
 a memory; and   a processor configured to execute a process including   identifying a changed area in which an image is changed in a frame to be displayed on the display,   analyzing, in a case where the changed area is identified, every time a frame to be displayed on the display is received, the image in the changed area in the received frame, in a corresponding one of first units for processing so that the image in the changed area is analyzed in the first units for processing over multiple frames by time division processing, and   generating control information for controlling the local dimming process for a corresponding area on the display, every time an analysis result with respect to the image in the first unit of processing is output.   
     
     
         2 . The control device as claimed in  claim 1 , wherein the identifying identifies the changed area by comparing a parameter calculated from histograms of the image in respective areas in a frame to be processed, with a parameter calculated from histograms of an image in corresponding areas in a previous frame preceding the frame to be processed. 
     
     
         3 . The control device as claimed in  claim 1 , wherein the identifying identifies the changed area, based on a signal from a head unit configured to output the image to be displayed on the display. 
     
     
         4 . The control device as claimed in  claim 1 , wherein the generating adjusts, every time the analysis result with respect to the image in the first unit of processing is output, image quality of the image in a corresponding portion. 
     
     
         5 . The control device as claimed in  claim 1 , the processor is further configured to execute obtaining, in a case where the changed area is identified, every time a frame to be displayed on the display is received, histograms of the image in the changed area in the received frame, in the corresponding one of first units for processing. 
     
     
         6 . The control device as claimed in  claim 5 , wherein the analyzing analyzes the image in the changed area, based on the histograms obtained by the obtaining unit, in the corresponding one of first units for processing. 
     
     
         7 . The control device as claimed in  claim 1 , wherein the analyzing changes a range of areas to be analyzed in which the image is analyzed in the changed area, according to a range in the frame in which the changed area is present. 
     
     
         8 . The control device as claimed in  claim 1 , wherein the analyzing changes a range of areas to be analyzed in which the image is analyzed in the changed area, according to a transition pattern among a plurality of display modes. 
     
     
         9 . The control device as claimed in  claim 1 , wherein the display is a liquid crystal display, and
 wherein the generating generates control information for controlling a corresponding backlight, every time the analysis result with respect to the image in the first unit of processing is output.   
     
     
         10 . A control method of a local dimming process of a display, executed by a control device, the control method comprising:
 identifying a changed area in which an image is changed in a frame to be displayed on the display;   analyzing, in a case where the changed area is identified, every time a frame to be displayed on the display is received, the image in the changed area in the received frame, in a corresponding one of first units for processing so that the image in the changed area is analyzed in the first units for processing over multiple frames by time division processing; and   generating control information for controlling the local dimming process for a corresponding area on the display, every time an analysis result with respect to the image in the first unit of processing is output.   
     
     
         11 . The display method as claimed in  claim 10 , wherein the identifying identifies the changed area by comparing a parameter calculated from histograms of the image in respective areas in a frame to be processed, with a parameter calculated from histograms of an image in corresponding areas in a previous frame preceding the frame to be processed. 
     
     
         12 . The display method as claimed in  claim 10 , wherein the identifying identifies the changed area, based on a signal from a head unit configured to output the image to be displayed on the display. 
     
     
         13 . The display method as claimed in  claim 10 , the control method further includes obtaining, in a case where the changed area is identified, every time a frame to be displayed on the display is received, histograms of the image in the changed area in the received frame, in the corresponding one of first units for processing. 
     
     
         14 . The display method as claimed in  claim 10 , wherein the analyzing changes a range of areas to be analyzed in which the image is analyzed in the changed area, according to a range in the frame in which the changed area is present. 
     
     
         15 . The display method as claimed in  claim 10 , wherein the analyzing changes a range of areas to be analyzed in which the image is analyzed in the changed area, according to a transition pattern among a plurality of display modes. 
     
     
         16 . A display system comprising:
 a head unit;   a display; and   a control device including a memory and a processor, provided between the head unit and the display, and configured to execute a local dimming process of the display,   wherein the processor is configured to execute a process including   identifying a changed area in which an image is changed in a frame to be displayed on the display,   analyzing, in a case where the changed area is identified by the identifying unit, every time a frame to be displayed on the display is received, the image in the changed area in the received frame, in a corresponding one of first units for processing so that the image in the changed area is analyzed in the first units for processing over multiple frames by time division processing, and   generating control information for controlling the local dimming process for a corresponding area on the display, every time an analysis result with respect to the image in the first unit of processing is output.   
     
     
         17 . The display system as claimed in  claim 16 , wherein the identifying identifies the changed area by comparing a parameter calculated from histograms of the image in respective areas in a frame to be processed, with a parameter calculated from histograms of an image in corresponding areas in a previous frame preceding the frame to be processed. 
     
     
         18 . The display system as claimed in  claim 16 , wherein the identifying identifies the changed area, based on a signal from the head unit configured to output the image to be displayed on the display. 
     
     
         19 . The display system as claimed in  claim 16 , the processor further executes obtaining, in a case where the changed area is identified, every time a frame to be displayed on the display is received, histograms of the image in the changed area in the received frame, in the corresponding one of first units for processing. 
     
     
         20 . The display system as claimed in  claim 16 , wherein the analyzing unit changes a range of areas to be analyzed in which the image is analyzed in the changed area, according to a range in the frame in which the changed area is present.