14. A system, comprising: a processor; memory including instructions that, upon being executed by the processor, cause the system to: identify query descriptors for query content of a search request, the query descriptors characterizing the query content; for each content piece of at least a portion of a content collection: identify a subset of content descriptors of the content piece that corresponds to at least a portion of the query descriptors, the content descriptors characterizing the content piece, one or more of the subset of the content descriptors corresponding to one or more blur transforms; identify first candidate regions of the content piece, one or more of the first candidate regions overlapping with at least another one of the first candidate regions, each first candidate region corresponding to at least a portion of the subset of the content descriptors; and select the content piece for inclusion in a matching content subset of the content collection when at least one of the first candidate regions comprises a first proportionate size greater than a first proportion threshold; and provide the matching content subset in response to the search request.
14. A system, comprising: a processor; memory including instructions that, upon being executed by the processor, cause the system to: identify query descriptors for query content of a search request, the query descriptors characterizing the query content; for each content piece of at least a portion of a content collection: identify a subset of content descriptors of the content piece that corresponds to at least a portion of the query descriptors, the content descriptors characterizing the content piece, one or more of the subset of the content descriptors corresponding to one or more blur transforms; identify first candidate regions of the content piece, one or more of the first candidate regions overlapping with at least another one of the first candidate regions, each first candidate region corresponding to at least a portion of the subset of the content descriptors; and select the content piece for inclusion in a matching content subset of the content collection when at least one of the first candidate regions comprises a first proportionate size greater than a first proportion threshold; and provide the matching content subset in response to the search request. 16. The system of claim 14 , wherein each first candidate regions is contained within a whole region of the content piece.