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 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, comprising:
 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.   
     
     
         2 . The video compression apparatus according to  claim 1 ,
 wherein the setting unit 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 setting unit is configured to magnify or reduce the search region based on the relation among the plurality of imaging conditions.   
     
     
         4 . The video compression apparatus according to  claim 3 ,
 wherein the setting unit 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 setting unit is configured to reduce the search region when the specific imaging condition 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 setting unit is configured to set, as a first search region, a 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 specific image region among the image regions,   wherein the generation unit is configured to use the first search region set by the setting unit and the second search region set by the setting unit to execute the processing having different pixel accuracies to thereby generate the motion vector.   
     
     
         7 . The video compression apparatus according to  claim 2 ,
 wherein the generation unit is configured to execute the processing exterior of the search region based on the result of the processing in the search region.   
     
     
         8 . The video compression apparatus according to  claim 2 , further comprising:
 a control unit 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 the 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 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, comprising:
 a setting unit configured to set a search region for detecting a specific region within a reference frame based on at least one of the plurality of imaging conditions set to the imaging element; and   a detection unit configured to detect, based on a compression target region having a frame different from the reference frame, the specific region from the search region set by the setting unit.   
     
     
         10 . A video compression program for causing a processor to execute the compression of 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,
 wherein the video compression program causes the processor:   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   to detect, based on the compression target region, the specific region in the search region.   
     
     
         11 . A video compression program for causing a processor to execute the compression of 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,
 to set a search region for detecting a specific region within a reference frame based on at least one of the plurality of imaging conditions set to the imaging element; and   to detect, based on a compression target region having a frame different from the reference frame, the specific region from the search region set by the setting unit.