OCR Hard — Low Receipt
Hard OCR case (low-contrast): SAMPLE text rendered with challenging conditions. Pair with the .txt ground truth.
Specifications
- Kind
- low-contrast
- Ground Truth
- RECEIPT #RX-SAMPLE-009 Subtotal 48.20
- Role
- ocr input
- Seed
- 1705
What is a .png file?
PNG (Portable Network Graphics) is a raster image format using lossless DEFLATE compression. It supports full 8- or 16-bit-per-channel truecolor, palette, and greyscale modes with an optional alpha channel, but no animation. It is the standard choice for screenshots, logos, and graphics with sharp edges or transparency.
How to use this file
Use an example PNG to test image decoders, alpha-compositing, thumbnail generators, and format converters, or to verify that a pipeline preserves transparency and color depth on round-trip.
How to use this file for testing
“OCR Hard — Low Receipt” is a deterministic Novus Examples fixture for OCR testing, Computer vision. Image-only 'scanned' documents paired with their text source, for measuring OCR accuracy against a known ground truth.
Documented properties for this file: seed 1705 · ocr input. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
For image AI or enhancement tools, run the model or filter on this file and diff against the clean or ground-truth companion in the same group when available. Keep seeds and documented damage parameters in your evaluation notes so regressions are attributable.
Run OCR on the scanned or image twin and score the output against the searchable or text ground truth on this page; the documented rotation, grain, and text content are the reference.
Code examples
<img src="low-receipt.png" alt="Example image" width="640" loading="lazy">Related files
- pngOCR Hard — Dotted CodeHard OCR case (dotted): SAMPLE text rendered with challenging conditions. Pair with the .txt ground truth.
- pngOCR Hard — Dotted SerialHard OCR case (dotted): SAMPLE text rendered with challenging conditions. Pair with the .txt ground truth.
- pngOCR Hard — Low ContrastHard OCR case (low-contrast): SAMPLE text rendered with challenging conditions. Pair with the .txt ground truth.
- pngOCR Hard — Low LabelHard OCR case (low-contrast): SAMPLE text rendered with challenging conditions. Pair with the .txt ground truth.
- pngOCR Hard — Skew AddressHard OCR case (skew): SAMPLE text rendered with challenging conditions. Pair with the .txt ground truth.
- pngOCR Hard — Skew DateHard OCR case (skew): SAMPLE text rendered with challenging conditions. Pair with the .txt ground truth.
Generated by generation/images_wave_e.py. Free for any use, no attribution required — license.