Delta Filter¶
Class: DeltaFilterBlockV1
Source: inference.core.workflows.core_steps.flow_control.delta_filter.v1.DeltaFilterBlockV1
The Delta Filter is a flow control block that triggers workflow steps only when an input value changes. It avoids redundant processing and optimizes system efficiency.
+----------------+ (value changes) +----------------+
| Previous Value | -----------------------> | Next Steps |
+----------------+ +----------------+
Key Features:
Change Detection: Tracks input values and only proceeds when a change is detected. Dynamic Value Support: Handles various input types (e.g., numbers, strings). Context-Aware Caching: Tracks changes on a per-video basis using video_identifier.
Usage Instructions: Input Configuration: Set "Input Value" to reference the value to monitor (e.g., counter). Next Steps Setup: Define steps to execute on value change.
Example Use Case:
A video analysis workflow counts people in the zone. When the count changes, Delta Filter triggers downstream steps (e.g., setting variable in OPC), minimizing redundant processing.
Type identifier¶
Use the following identifier in step "type" field: roboflow_core/delta_filter@v1to add the block as
as step in your workflow.
Properties¶
| Name | Type | Description | Refs |
|---|---|---|---|
name |
str |
Enter a unique identifier for this step.. | ❌ |
The Refs column marks possibility to parametrise the property with dynamic values available
in workflow runtime. See Bindings for more info.
Available Connections¶
Compatible Blocks
Check what blocks you can connect to Delta Filter in version v1.
- inputs:
Image Preprocessing,Image Slicer,OpenAI,Dynamic Crop,Multi-Label Classification Model,Roboflow Dataset Upload,Moondream2,Corner Visualization,Google Gemini,Depth Estimation,Keypoint Detection Model,PTZ Tracking (ONVIF).md),Keypoint Detection Model,Dimension Collapse,Single-Label Classification Model,Model Comparison Visualization,Time in Zone,Email Notification,Mask Visualization,Model Monitoring Inference Aggregator,Property Definition,Line Counter,OpenAI,Detections Filter,Barcode Detection,Morphological Transformation,Classification Label Visualization,Time in Zone,Dynamic Zone,Florence-2 Model,Stitch Images,Cache Set,Triangle Visualization,Pixel Color Count,Stability AI Image Generation,CogVLM,Ellipse Visualization,SIFT Comparison,Detections Stabilizer,Llama 3.2 Vision,Florence-2 Model,Overlap Filter,Distance Measurement,Byte Tracker,Local File Sink,Detection Offset,Background Color Visualization,QR Code Generator,Segment Anything 2 Model,Anthropic Claude,VLM as Detector,Byte Tracker,Polygon Visualization,Camera Focus,Cosine Similarity,Detections Classes Replacement,Instance Segmentation Model,Identify Outliers,Image Contours,OpenAI,Object Detection Model,Dominant Color,Halo Visualization,VLM as Classifier,Detections Merge,EasyOCR,Stability AI Inpainting,Grid Visualization,Image Blur,Instance Segmentation Model,Time in Zone,Delta Filter,Absolute Static Crop,LMM,Color Visualization,Stability AI Outpainting,Keypoint Visualization,Trace Visualization,Clip Comparison,First Non Empty Or Default,Google Vision OCR,YOLO-World Model,Image Slicer,Clip Comparison,Size Measurement,Environment Secrets Store,Multi-Label Classification Model,Buffer,Detections Consensus,Image Threshold,Contrast Equalization,Path Deviation,Velocity,Relative Static Crop,Path Deviation,Camera Calibration,Blur Visualization,Roboflow Dataset Upload,JSON Parser,Qwen2.5-VL,Perspective Correction,SIFT,Icon Visualization,Detections Transformation,Label Visualization,QR Code Detection,Stitch OCR Detections,Object Detection Model,VLM as Detector,Byte Tracker,SmolVLM2,Single-Label Classification Model,Line Counter Visualization,Line Counter,SIFT Comparison,Slack Notification,Image Convert Grayscale,Detections Combine,Roboflow Custom Metadata,Gaze Detection,Perception Encoder Embedding Model,Expression,Twilio SMS Notification,VLM as Classifier,Cache Get,Identify Changes,Polygon Zone Visualization,Rate Limiter,Detections Stitch,Bounding Rectangle,Data Aggregator,Dot Visualization,LMM For Classification,Template Matching,CLIP Embedding Model,Circle Visualization,Bounding Box Visualization,OCR Model,Reference Path Visualization,CSV Formatter,Pixelate Visualization,Continue If,Webhook Sink,Crop Visualization - outputs: None
Input and Output Bindings¶
The available connections depend on its binding kinds. Check what binding kinds
Delta Filter in version v1 has.
Bindings
Example JSON definition of step Delta Filter in version v1
{
"name": "<your_step_name_here>",
"type": "roboflow_core/delta_filter@v1",
"image": "<block_does_not_provide_example>",
"value": "$steps.line_counter.count_in",
"next_steps": "$steps.write_to_csv"
}