iminspect 1.3.10

Qt-based GUI to visualize image-like data.

iminspect

A python utility package for image/matrix visualization.

Moving from MATLAB to python I was missing fast and easy-to-use inspection tools for image data. Thus, iminspect provides a collection of visualization/inspection capabilities along with a simplistic Qt-based GUI. The goal is to enable quick and easy visualization/analysis of:

• color images,
• monochrome images (i.e. any type of 2D matrices),
• label images (i.e. categorical data),
• binary masks,
• depth maps, and
• optical flow data.

Example usage (within a Python script):

from iminspect.inspector import inspect, DataType
import numpy as np

# Show random noise image:
inspect(np.random.rand(4096,4096) - 0.5)

# Show as class labels:
inspect((np.random.rand(16,16) * 1e2 % 5).astype(np.int16), data_type=DataType.CATEGORICAL)

# Show two images next to each other, e.g. useful to analyse RGB and
# corresponding depth, or RGB and corresponding optical flow:
inspect((data_color, data_depth))
# or specify the data types manually:
inspect((rgb, flow), data_type=(DataType.COLOR, DataType.FLOW)))

Example: visualizing categorical data (i.e. labels)

Example: visualizing a mask image

Example: visualizing RGB image and optical flow

Example usage (standalone):

The iminspect package can be run as a standalone application, so you could create a launcher, add it to your system's binary/executable path, etc. You can either do this manually via the following steps or try the standalone/install-... scripts.

1. Set up a virtual environment (in this example, I'll use a separate util-iminspect folder to install the iminspect package):

   cd desired/installation/path
   python3 -m venv util-iminspect
   source util-iminspect/bin/activate
   pip install -U pip
   pip install iminspect
   

2. Run iminspect standalone via:

   desired/installation/path/util-iminspect/bin/python3 -m iminspect
   

Custom input widgets:

The iminspect.inputs subpackage provides common user input widgets, e.g. to select a rectangular region-of-interest, enter an IP address, etc. See the examples/inputs_demo.py application on how to use it. Exemplary screenshot:

Dependencies

• numpy, for matrix manipulation
• PyQt5, for the graphical user interface - if there's a PyQt5-related install error, you need to upgrade pip via pip install --upgrade pip.
• qimage2ndarray, to convert numpy ndarrays to Qt images
• vito, a lightweight vision tool package

UI Documentation

• To inspect a data point/pixel, just move the mouse above it.
• Zooming:
  • Ctrl+Wheel to zoom in/out.
  • Ctrl+Shift+Wheel to speed up zooming.
  • Ctrl+{+|-} to zoom in/out.
  • Ctrl+Shift+{+|-} to zoom in/out faster.
  • Ctrl+F to zoom such that the image fills the available canvas.
  • Ctrl+1 to scale to original size.
• Scrolling:
  • Wheel scrolls up/down.
  • Shift+Wheel speeds up scrolling.
  • Ctrl+{Up|Down|Left|Right} to scroll using keyboard.
  • Ctrl+Shift+{Up|Down|Left|Right} to scroll faster/further.
  • Press and move left/right button to drag the image if zoomed in.
• Keyboard shortcuts:
  • Ctrl+Q and Ctrl+W close the inspection GUI.
  • Ctrl+O shows a dialog to open another file.
  • Ctrl+S shows a dialog to save either the (raw) input or its current visualization.
  • Ctrl+T toggle tool tip display when moving the mouse over the data.
  • Ctrl+R reloads the current data such that the user can select a different visualization/data type.

Changelog

• 1.3.10
  • Added utility scripts for standalone installation (on Ubuntu).
  • Clarified standalone usage example.
  • Minor tweaks to the inputs subpackage.
• 1.3.9
  • Handle non-finite values: Info/caution message shows in the data summary label, non-finite values are ignored in computing the data statistics.
  • Option (Shortcut and toolbar button) to reload the currently inspected data with a different visualization/data type.
  • Added application icon.
• 1.3.8
  • Added support for opening files via dropping them from external image viewer applications. Tested with common Linux viewers (eog and geeqie).
• 1.3.7
  • Support opening files by dropping them into the viewer.
  • Added __main__ to run module (open the inspector) via python -m iminspect
• 1.3.6
  • Inspector handles 1D inputs.
  • Minor tweaks to the inputs subpackage.
• 1.3.5
  • Bug fix - rounding issues during initialization of custom slider widgets (which use floats).
• 1.3.4
  • Minor tweaks to the inputs subpackage.
• 1.3.3
  • Add functionality to open the inspector without data (in case you want to load from disk).
• 1.3.2
  • Added color picker widget to inputs.
  • Support multiple file selection dialog.
• 1.3.1
  • Minor extensions to user inputs subpackage.
• 1.3.0
  • Added a range slider to adjust visualization limits on the fly.
  • Image viewer (canvas) now supports dragging.
  • Support toggling the tool tip display.
  • Support adding custom labels for categorical data.
  • Fix running inputs.py as standalone demo (relative import confusion).
• 1.2.0
  • Support multi-channel input data (with more than 4 channels).
  • Support analysing multiple images at once, e.g. color images and corresponding optical flow.
  • Major refactoring under the hood.
• 1.1.0
  • Support saving visualization and raw input data to disk.
  • Added shorthand wrapper to inspect() call.
  • UI improvements/layout changes.
  • Fixed typos such as DataType.CATEGORICAL.
  • Added support for partially transparent images (i.e. RGBA).
• 1.0.0
  • Major code refactoring: use data type enum instead of various flags (this breaks previous inspect() calls).
  • Optical flow support.
  • Load another file from disk (via Ctrl+O).
  • Usability improvements, e.g. restore display settings when opening similar data type, handle file loading errors, etc.
• 0.2.0
  • Major refactoring: moved image utils and colorizing code to separate vito package.
  • Usability improvements: keyboard shortcuts for zooming, scaling and scrolling.
• 0.1.2
  • Added tests for non-GUI functionality.
  • Integrate github runners for test/build/deploy.
  • Fix definition for colormap gray.
• 0.1.1
  • Additional features:
    • ImageCanvas supports ROI selection (useful for custom input widgets).
  • Refactoring:
    • Clean up imports.
    • Make pylint/flake8 happier.
  • Fixes:
    • Adjust scrollbars when zooming multiple linked ImageCanvas.
• 0.1.0 - Initial public release.