Initial Implementation

Summary

Initial implementation of Mini-ImagePipe framework completed.

Status: Completed Date Archived: 2026-04-23

Completed Work

1. Set up project structure and core infrastructure

  • 1.1 Create CMake project structure with CUDA support
    • Set up CMakeLists.txt with CUDA language support
    • Configure include directories and library targets
    • Requirements: Project setup
  • 1.2 Implement ImageBuffer and KernelConfig data structures
    • Create include/types.h with ImageBuffer, KernelConfig, PipelineConfig structs
    • Requirements: Data Models
  • 1.3 Implement IOperator base interface
    • Create include/operator.h with abstract IOperator class
    • Requirements: Component Interfaces

2. Implement Memory Manager

  • 2.1 Implement MemoryManager singleton with pinned memory allocation
    • Create src/memory_manager.cu with cudaHostAlloc/cudaFree
    • Implement allocatePinned, freePinned, allocateDevice, freeDevice
    • Implement async copy functions with CUDA streams
    • Requirements: 7.1, 7.2
  • 2.2 Implement memory pool for pinned memory reuse
    • Add MemoryPool struct with free block tracking
    • Implement block reuse logic in allocate/free
    • Requirements: 7.4
  • 2.3 Implement fallback to pageable memory
    • Add fallback logic when cudaHostAlloc fails
    • Log warning on fallback
    • Requirements: 7.3
  • 2.4 Implement shutdown and cleanup
    • Free all tracked allocations on shutdown
    • Requirements: 7.5
  • 2.5 Write property test for memory pool reuse
    • Property 17: Memory Pool Reuse
    • Validates: Requirements 7.4
  • 2.6 Write property test for memory cleanup
    • Property 18: Memory Cleanup
    • Validates: Requirements 7.5

3. Checkpoint - Memory Manager

  • Ensure all tests pass, ask the user if questions arise.

4. Implement Color Conversion Operator

  • 4.1 Implement ColorConvertOperator class
    • Create src/operators/color_convert.cu
    • Implement RGB_TO_GRAY, BGR_TO_RGB, RGBA_TO_RGB conversions
    • Use luminance formula Y = 0.299R + 0.587G + 0.114*B
    • Requirements: 4.1, 4.2, 4.3
  • 4.2 Implement alpha channel preservation
    • Preserve alpha channel during conversions when present
    • Requirements: 4.4
  • 4.3 Write property test for RGB to Grayscale formula
    • Property 8: RGB to Grayscale Formula
    • Validates: Requirements 4.2
  • 4.4 Write property test for BGR to RGB channel swap
    • Property 9: BGR to RGB Channel Swap
    • Validates: Requirements 4.3
  • 4.5 Write property test for alpha channel preservation
    • Property 10: Alpha Channel Preservation
    • Validates: Requirements 4.4

5. Implement Resize Operator

  • 5.1 Implement ResizeOperator class with bilinear interpolation
    • Create src/operators/resize.cu
    • Implement bilinear interpolation kernel
    • Requirements: 3.1
  • 5.2 Implement nearest-neighbor interpolation
    • Add NEAREST mode to resize kernel
    • Requirements: 3.2
  • 5.3 Implement coordinate mapping and arbitrary scale factors
    • Compute src coordinates from dst coordinates
    • Support both upscaling and downscaling
    • Requirements: 3.3, 3.4
  • 5.4 Write property test for resize coordinate mapping
    • Property 6: Resize Coordinate Mapping
    • Validates: Requirements 3.1, 3.2, 3.3
  • 5.5 Write property test for arbitrary scale factors
    • Property 7: Resize Arbitrary Scale Factors
    • Validates: Requirements 3.4

6. Implement Sobel Edge Detection Operator

  • 6.1 Implement SobelOperator class
    • Create src/operators/sobel.cu
    • Implement 3x3 Sobel kernels for Gx and Gy
    • Use shared memory for efficient access
    • Requirements: 2.1, 2.3
  • 6.2 Implement gradient magnitude computation
    • Compute magnitude as sqrt(Gx² + Gy²)
    • Output single-channel result
    • Requirements: 2.2, 2.4
  • 6.3 Write property test for Sobel gradient computation
    • Property 4: Sobel Gradient Computation
    • Validates: Requirements 2.1, 2.2
  • 6.4 Write property test for Sobel single-channel output
    • Property 5: Sobel Single-Channel Output
    • Validates: Requirements 2.4

7. Checkpoint - Basic Operators

  • Ensure all tests pass, ask the user if questions arise.

8. Implement Gaussian Blur Operator

  • 8.1 Implement GaussianBlurOperator class with separable filter
    • Create src/operators/gaussian_blur.cu
    • Generate 1D Gaussian kernels for horizontal and vertical passes
    • Support kernel sizes 3x3, 5x5, 7x7
    • Requirements: 1.1, 1.2
  • 8.2 Implement shared memory with halo regions
    • Load tile + halo into shared memory
    • Handle boundary with reflection padding
    • Requirements: 1.3, 1.4
  • 8.3 Implement multi-channel support
    • Support 1, 3, and 4 channel images
    • Requirements: 1.5
  • 8.4 Write property test for Gaussian blur multi-channel support
    • Property 1: Gaussian Blur Multi-Channel Support
    • Validates: Requirements 1.1, 1.5
  • 8.5 Write property test for separable filter equivalence
    • Property 2: Separable Filter Equivalence
    • Validates: Requirements 1.2
  • 8.6 Write property test for reflection padding boundary handling
    • Property 3: Reflection Padding Boundary Handling
    • Validates: Requirements 1.4

9. Checkpoint - All Operators

  • Ensure all tests pass, ask the user if questions arise.

10. Implement Task Graph

  • 10.1 Implement TaskNode and TaskGraph classes
    • Create src/task_graph.cpp
    • Implement addTask, addDependency methods
    • Track node states (PENDING, READY, RUNNING, COMPLETED, FAILED)
    • Requirements: 5.1
  • 10.2 Implement cycle detection
    • Use DFS-based cycle detection in addDependency
    • Reject edges that would create cycles
    • Requirements: 5.1
  • 10.3 Implement topological sorting
    • Implement getTopologicalOrder using Kahn’s algorithm
    • Implement getReadyTasks for scheduler
    • Requirements: 5.6
  • 10.4 Write property test for DAG cycle detection
    • Property 11: DAG Cycle Detection
    • Validates: Requirements 5.1

11. Implement DAG Scheduler

  • 11.1 Implement DAGScheduler class with CUDA streams
    • Create src/scheduler.cu
    • Create configurable number of CUDA streams
    • Implement stream assignment for tasks
    • Requirements: 6.1, 6.4
  • 11.2 Implement dependency-based execution
    • Execute tasks in topological order
    • Respect all dependency constraints
    • Trigger dependents when task completes
    • Requirements: 5.2, 5.4
  • 11.3 Implement CUDA event synchronization
    • Insert events for cross-stream dependencies
    • Synchronize all streams on completion
    • Requirements: 6.2, 6.5
  • 11.4 Implement error propagation
    • Mark failed tasks and halt dependents
    • Invoke error callback on failure
    • Requirements: 5.5
  • 11.5 Write property test for dependency ordering
    • Property 12: Dependency Ordering
    • Validates: Requirements 5.2, 5.4, 5.6
  • 11.6 Write property test for error propagation
    • Property 13: Error Propagation
    • Validates: Requirements 5.5
  • 11.7 Write property test for stream assignment and synchronization
    • Property 14: Stream Assignment and Synchronization
    • Validates: Requirements 6.1, 6.2
  • 11.8 Write property test for stream synchronization on completion
    • Property 15: Stream Synchronization on Completion
    • Validates: Requirements 6.5

12. Checkpoint - Scheduler

  • Ensure all tests pass, ask the user if questions arise.

13. Implement Pipeline Builder

  • 13.1 Implement Pipeline class
    • Create src/pipeline.cpp
    • Implement addOperator, connect methods
    • Wire to TaskGraph and DAGScheduler
    • Requirements: 8.1
  • 13.2 Implement automatic intermediate buffer allocation
    • Allocate buffers based on operator output dimensions
    • Manage buffer lifecycle
    • Requirements: 8.2
  • 13.3 Implement shared output for multiple dependents
    • Ensure single execution for nodes with multiple dependents
    • Share output buffer reference
    • Requirements: 8.3
  • 13.4 Implement runtime parameter configuration
    • Add setParameter method for runtime updates
    • Apply without graph reconstruction
    • Requirements: 8.4
  • 13.5 Implement batch processing
    • Implement executeBatch for multiple frames
    • Requirements: 8.5
  • 13.6 Write property test for pipeline topology and buffer management
    • Property 19: Pipeline Topology and Buffer Management
    • Validates: Requirements 8.1, 8.2
  • 13.7 Write property test for no redundant computation
    • Property 20: No Redundant Computation
    • Validates: Requirements 8.3
  • 13.8 Write property test for runtime parameter configuration
    • Property 21: Runtime Parameter Configuration
    • Validates: Requirements 8.4
  • 13.9 Write property test for batch processing
    • Property 22: Batch Processing
    • Validates: Requirements 8.5

14. Final Checkpoint

  • Ensure all tests pass, ask the user if questions arise.

15. Integration and wiring

  • 15.1 Create example pipeline demonstrating all operators
    • Create examples/demo_pipeline.cpp
    • Chain Resize → ColorConvert → GaussianBlur → Sobel
    • Requirements: 8.1
  • 15.2 Write integration tests for end-to-end pipeline
    • Test complete pipeline execution
    • Verify output correctness
    • Requirements: All

Notes

  • All tasks including property tests are required for comprehensive coverage
  • Each task references specific requirements for traceability
  • Checkpoints ensure incremental validation
  • Property tests validate universal correctness properties
  • Unit tests validate specific examples and edge cases
  • CUDA code files use .cu extension, C++ files use .cpp