@startuml PersonSDK Architecture

!theme plain
skinparam backgroundColor white
skinparam componentStyle rectangle

package "PersonSDK" {

    component "IRuntime" as runtime
    component "Configuration" as config

    interface "IBackend" as backend
    component "CPU Backend" as cpu_backend
    component "GPU Backend" as gpu_backend
    component "Other Backends" as other_backends

    interface "IHeadDetector" as head_detector
    interface "IBodyDetector" as body_detector
    interface "IHeadPosition" as head_position
    interface "IBodyPosition" as body_position
    interface "IFrameView" as frame_view

    ' Advanced processing components
    interface "IBodyExtractor" as body_extractor
    interface "IBodyClassifier" as body_classifier
    interface "ITracker" as tracker
    interface "IUpperBodyExtractor" as upper_extractor
    interface "IUpperBodyClassifier" as upper_classifier
    interface "IBodyMatcher" as body_matcher

    ' Utility interfaces
    interface "ISizeRule" as size_rule
    interface "IRoi" as roi
    interface "KwArg" as kwarg
}

' Relationships
runtime --> config : uses
runtime --> backend : creates
backend <|-- cpu_backend
backend <|-- gpu_backend
backend <|-- other_backends

backend --> head_detector : new_head_detector()
backend --> body_detector : new_body_detector()
backend --> body_extractor : new_body_extractor()
backend --> body_classifier : new_body_classifier()
backend --> tracker : new_tracker()

head_detector --> head_position : returns vector<>
body_detector --> body_position : returns vector<>

head_detector --> frame_view : processes
body_detector --> frame_view : processes

head_detector --> kwarg : uses
body_detector --> kwarg : uses
head_detector --> size_rule : uses
head_detector --> roi : uses

body_extractor --> body_position : processes
body_classifier --> body_position : processes
tracker --> head_position : tracks
tracker --> body_position : tracks

upper_extractor --> body_position : processes
upper_classifier --> body_position : processes
body_matcher --> body_position : matches

note top of runtime
Entry point for SDK
Handles configuration
and backend management
end note

note right of head_detector
Main detection interface
set_defaults(args)
run(image, args)
Thread-safe with external sync
end note

note bottom of kwarg
Flexible parameter system:
Type-safe variants
Named parameters
Default value management
end note

@enduml