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:
Bounding Rectangle,Line Counter,Ellipse Visualization,Label Visualization,Llama 3.2 Vision,Polygon Zone Visualization,Detections Stabilizer,Size Measurement,Time in Zone,Image Contours,Background Color Visualization,Color Visualization,Image Blur,Stitch Images,LMM,Clip Comparison,First Non Empty Or Default,Segment Anything 2 Model,Dynamic Crop,Pixelate Visualization,Template Matching,Instance Segmentation Model,Keypoint Detection Model,VLM as Detector,Delta Filter,QR Code Detection,SIFT Comparison,Detection Offset,Object Detection Model,Reference Path Visualization,VLM as Classifier,Classification Label Visualization,Clip Comparison,Perspective Correction,OCR Model,Byte Tracker,Roboflow Dataset Upload,Instance Segmentation Model,Roboflow Dataset Upload,Single-Label Classification Model,Image Slicer,Trace Visualization,YOLO-World Model,Model Monitoring Inference Aggregator,Twilio SMS Notification,Detections Filter,Line Counter Visualization,Google Vision OCR,VLM as Detector,Image Convert Grayscale,Byte Tracker,Google Gemini,Corner Visualization,Blur Visualization,Detections Stitch,Environment Secrets Store,Polygon Visualization,Email Notification,Rate Limiter,Single-Label Classification Model,Halo Visualization,JSON Parser,CogVLM,Local File Sink,Florence-2 Model,Gaze Detection,Florence-2 Model,Grid Visualization,Image Slicer,LMM For Classification,Distance Measurement,Barcode Detection,Multi-Label Classification Model,Dominant Color,Detections Consensus,CLIP Embedding Model,Anthropic Claude,Image Threshold,Camera Focus,Keypoint Visualization,Pixel Color Count,Dynamic Zone,Byte Tracker,Stitch OCR Detections,Roboflow Custom Metadata,Keypoint Detection Model,Absolute Static Crop,Qwen2.5-VL,Crop Visualization,Detections Transformation,Stability AI Image Generation,Cache Get,Path Deviation,Line Counter,Identify Changes,Bounding Box Visualization,Multi-Label Classification Model,Slack Notification,Property Definition,Cache Set,Time in Zone,Buffer,Data Aggregator,Detections Classes Replacement,Dimension Collapse,Continue If,Expression,OpenAI,Dot Visualization,Mask Visualization,Stability AI Inpainting,Webhook Sink,SIFT Comparison,Velocity,CSV Formatter,Model Comparison Visualization,Identify Outliers,Path Deviation,Circle Visualization,Image Preprocessing,SIFT,Cosine Similarity,VLM as Classifier,Object Detection Model,Relative Static Crop,Triangle Visualization,OpenAI - 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"
}