Video compression apparatus and video compression program

Abstract

A video compression apparatus for compressing video data as a series of frames outputted from an imaging element that has a plurality of imaging regions for imaging a subject and for which imaging conditions can be set for the respective imaging regions, includes: a setting unit configured to set, based on an imaging condition set in a compression target region of a frame different from a reference frame, a search region for detecting a specific region in the reference frame; and a detection unit configured to detect, based on the compression target region, the specific region in the search region set by the setting unit.

What is claimed is: 
     
         1 . A video compression apparatus for compressing video data output as a series of frames from an imaging element that has a plurality of imaging regions for imaging a subject and for which imaging conditions can be set for respective imaging regions of the plurality of imaging regions, the video compression apparatus comprising:
 a processor configured to:
 set, based on one of the imaging conditions to which the imaging element is set in a compression target region of a frame different from a reference frame, a search region for detecting a specific image region in the reference frame; and 
 detect, based on the compression target region, the specific image region in the search region that has been set. 
   
     
     
         2 . The video compression apparatus according to  claim 1 ,
 wherein the processor is configured to set the search region to the specific image region and image regions of other imaging conditions surrounding the specific image region.   
     
     
         3 . The video compression apparatus according to  claim 1 ,
 wherein the processor is configured to magnify or reduce the search region based on a relation among the plurality of imaging conditions.   
     
     
         4 . The video compression apparatus according to  claim 3 ,
 wherein the processor is configured to magnify or reduce the search region based on a difference among values shown by the plurality of imaging conditions.   
     
     
         5 . The video compression apparatus according to  claim 3 ,
 wherein the processor is configured to reduce the search region when a specific imaging condition on which the setting of the search region is based is a specific exposure time and other imaging conditions among the plurality of imaging conditions other than the specific imaging condition is an exposure time shorter than the specific exposure time.   
     
     
         6 . The video compression apparatus according to  claim 1 , wherein
 the processor is configured to set, as a first search region, a first specific image region among image regions of images generated and having a plurality of imaging conditions that has a specific imaging condition and in which the compression target region exists and set, as a second search region, image regions other than the first specific image region among the image regions, and   the processor is configured to use the first search region that has been set and the second search region that has been set to execute a processing having different pixel accuracies to thereby generate a motion vector.   
     
     
         7 . The video compression apparatus according to  claim 2 ,
 wherein the processor is configured to execute a processing in an area exterior of the search region based on a result of the processing in the search region.   
     
     
         8 . The video compression apparatus according to  claim 2 , wherein
 the processor is configured to execute a block matching for a search target range as a matching target with the compression target region in the search region based on a ratio between specific pixels included in the search target range and the specific image region and other pixels included in the image regions other than the search target range and the specific image region.   
     
     
         9 . A video compression apparatus for compressing video data output as a series of frames from an imaging element that has a plurality of imaging regions for imaging a subject and for which imaging conditions can be set for respective imaging regions of the plurality of imaging regions, the video compression apparatus comprising:
 a processor configured to:
 set a search region for detecting a specific image region within a reference frame based on at least one of the plurality of imaging conditions to which the imaging element is set; and 
 detect, based on a compression target region of a frame different from the reference frame, the specific image region from the search region that has been set. 
   
     
     
         10 . A non-transitory computer-readable storage medium on which is stored a video compression program that causes a processor to execute compression of video data output as a series of frames from an imaging element that has a plurality of imaging regions for imaging a subject and for which imaging conditions can be set for respective imaging regions of the plurality of imaging regions, the program including instructions that cause the processor to:
 set, based on one of the imaging conditions to which the imaging element is set in a compression target region of a frame different from a reference frame, a search region for detecting a specific image region in the reference frame; and   detect, based on the compression target region, the specific image region in the search region that has been set.   
     
     
         11 . A non-transitory computer-readable storage medium on which is stored a video compression program that causes a processor to execute compression of video data output as a series of frames from an imaging element that has a plurality of imaging regions for imaging a subject and for which imaging conditions can be set for respective imaging regions of the plurality of imaging regions, the program including instructions that cause the processor to:
 set a search region for detecting a specific image region within a reference frame based on at least one of the plurality of imaging conditions to which the imaging element is set; and   detect, based on a compression target region of a frame different from the reference frame, the specific image region from the search region that has been set.