docs: streamline readme by removing redundant examples and condensing sections

- Compress introduction and explanation paragraphs
- Remove detailed debug output example
- Simplify usage examples and feature descriptions
- Condense threshold guide and output modes
- Reduce file length by ~40% while preserving all functionality
- add exmaples

.gitignore

@@ -2,4 +2,8 @@
 *.mkv
 *.mp4
 *.avi
-.venv/
+.venv/
+#demos
+!demo_changes.png
+!demo.jpg
+!line500fps32pix.mp4

readme.md

@@ -2,89 +2,45 @@
 
 A digital implementation of **strip photography** (also called **slit photography**) that captures a two-dimensional image as a sequence of one-dimensional images over time.
 
-**How it works:**
-Strip photography records a moving scene over time using a camera that observes a narrow strip rather than the full field. This implementation simulates the technique by extracting the same line position from each video frame and assembling them into a composite image where:
+![demo](demo.png)
+
+Strip photography records a moving scene over time by extracting the same line position from each video frame and assembling them into a composite image where:
 - One axis represents **space** (the slit/line being observed)
 - The other axis represents **time** (progression through video frames)
-
-**Visual effects:**
-- Moving objects appear as visible shapes in the final image
-- Stationary objects (like background) appear as horizontal/vertical stripes
+- Moving objects appear as visible shapes, stationary objects as stripes
 - Object width is inversely proportional to speed (faster = narrower, slower = wider)
 
 ## Usage
 
-**Column Mode** - Extract vertical lines (columns) from each frame:
+**Row Mode** - Extract horizontal lines with threshold filtering:
 ```bash
-uv run main.py test1.mkv --xcolumn 100 --output test1_column.png
+uv run main.py .\line500fps32pix.mp4 --yrow 16 --output demo.jpg --threshold 0.005
 ```
 
-**Row Mode** - Extract horizontal lines (rows) from each frame:
+**Debug Mode** - Analyze changes and generate threshold recommendations:
 ```bash
-uv run main.py test1.mkv --yrow 200 --output test1_row.png
+uv run main.py .\line500fps32pix.mp4 --yrow 16 --output demo.jpg --debug
 ```
+![debug view](demo_changes.png)
 
-**Debug Mode** - Analyze changes and generate threshold graph:
-```bash
-uv run main.py test1.mkv --xcolumn 100 --output analysis --debug
-```
-
-**Custom Threshold** - Control compression by setting change threshold:
-```bash
-uv run main.py test1.mkv --xcolumn 100 --output test1_column.png --threshold 0.01
-```
-
-## Configure
-We use uv to handle pip dependencies. Install with:
+## Setup
+Install dependencies with uv:
 ```bash
 uv sync
 ```
 
-## Output
-- **Column mode**: Extracts vertical line at x-coordinate from each frame
-  - Output dimensions: `(source_height, total_frames, 3)`
-  - Width = number of frames, Height = source video height
-- **Row mode**: Extracts horizontal line at y-coordinate from each frame
-  - Output dimensions: `(total_frames, source_width, 3)`
-  - Width = source video width, Height = number of frames
+## Output Modes
+- **Column mode**: Extracts vertical line (`--xcolumn`) → Width = frames, Height = video height
+- **Row mode**: Extracts horizontal line (`--yrow`) → Width = video width, Height = frames
 
-Each column/row in the output represents one frame from the input video, showing motion over time.
+## Features
 
-## Advanced Features
+**Change Detection**: Automatically filters frames with minimal changes using configurable thresholds
+- Use `--threshold` (0-1) to control sensitivity
+- `--debug` mode provides threshold recommendations and change analysis
+- Higher thresholds = more compression, fewer frames
 
-### Change Detection & Compression
-The implementation includes intelligent change detection that discards frames with minimal visual changes, creating more compact outputs that focus on motion:
-
-- **Automatic filtering**: Only frames with significant changes are included
-- **Configurable threshold**: Use `--threshold` (0-1) to control sensitivity
-- **Compression stats**: Shows how many frames were kept vs. skipped
-
-### Debug Mode
-Use `--debug` to analyze your video and determine optimal threshold values:
-
-```bash
-uv run main.py video.mp4 --xcolumn 500 --output analysis --debug
-```
-
-This generates:
-- **Change graph**: Visual plot of frame-to-frame changes over time
-- **Statistics**: Mean, max, min, and standard deviation of changes
-- **Threshold suggestions**: Recommended values with compression ratios
-
-### Threshold Selection Guide
-- **0.001-0.005**: High sensitivity, keeps most motion (10-30% compression)
-- **0.005-0.02**: Medium sensitivity, good balance (30-70% compression)
-- **0.02-0.1**: Low sensitivity, only major changes (70-95% compression)
-- **>0.1**: Very low sensitivity, minimal frames (95%+ compression)
-
-### Examples with Compression
-
-Extract with 75% compression (recommended starting point):
-```bash
-uv run main.py video.mp4 --xcolumn 320 --output compressed.png --threshold 0.01
-```
-
-Maximum compression for detecting only major scene changes:
-```bash
-uv run main.py video.mp4 --xcolumn 320 --output minimal.png --threshold 0.05
-```
+**Threshold Guide**:
+- `0.001-0.005`: High sensitivity (10-30% compression)
+- `0.005-0.02`: Medium sensitivity (30-70% compression)
+- `0.02+`: Low sensitivity (70%+ compression)