feat(pdftract-3wku): implement deskew via pixFindSkewAndDeskew
Implement the deskew preprocessing step using leptonica's pixFindSkewAndDeskew (Hough line transform). The function: - Detects dominant text angle on grayscale input - Rotates by negative angle if >= 0.3 deg threshold - Returns input unchanged for negligible skews (< 0.3 deg) - Emits IMG_DESKEW_OUT_OF_RANGE diagnostic for angles > 15 deg - Returns detected angle for quality tracking Changes: - Add leptonica-plumbing dependency (ocr feature) - Create preprocess.rs module with deskew() function - Add ImgDeskewOutOfRange diagnostic code - Expose preprocess module in lib.rs The implementation uses pixFindSkewAndDeskew which both detects the skew angle and performs deskewing in one call, returning the detected angle for debugging purposes. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
jedarden
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2d1554bb1d
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@ -143,7 +143,7 @@ checksum = "0ae92a5119aa49cdbcf6b9f893fe4e1d98b04ccbf82ee0584ad948a44a734dea"
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||||
checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
|
||||
|
||||
[[package]]
|
||||
name = "rustc-hash"
|
||||
version = "2.1.2"
|
||||
|
|
@ -2743,7 +2863,7 @@ version = "0.38.44"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "fdb5bc1ae2baa591800df16c9ca78619bf65c0488b41b96ccec5d11220d8c154"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
"bitflags 2.11.1",
|
||||
"errno",
|
||||
"libc",
|
||||
"linux-raw-sys 0.4.15",
|
||||
|
|
@ -2756,7 +2876,7 @@ version = "1.1.4"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
"bitflags 2.11.1",
|
||||
"errno",
|
||||
"libc",
|
||||
"linux-raw-sys 0.12.1",
|
||||
|
|
@ -2853,7 +2973,7 @@ dependencies = [
|
|||
"proc-macro2",
|
||||
"quote",
|
||||
"serde_derive_internals",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -2904,7 +3024,7 @@ checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -2915,7 +3035,7 @@ checksum = "18d26a20a969b9e3fdf2fc2d9f21eda6c40e2de84c9408bb5d3b05d499aae711"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -3091,6 +3211,17 @@ version = "2.6.1"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "1.0.109"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "2.0.117"
|
||||
|
|
@ -3119,7 +3250,7 @@ checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -3128,7 +3259,7 @@ version = "0.7.0"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a13f3d0daba03132c0aa9767f98351b3488edc2c100cda2d2ec2b04f3d8d3c8b"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
"bitflags 2.11.1",
|
||||
"core-foundation",
|
||||
"system-configuration-sys",
|
||||
]
|
||||
|
|
@ -3229,7 +3360,7 @@ checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -3240,7 +3371,7 @@ checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -3337,7 +3468,7 @@ checksum = "385a6cb71ab9ab790c5fe8d67f1645e6c450a7ce006a33de03daa956cf70a496"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -3442,7 +3573,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
|
|||
checksum = "1e9cd434a998747dd2c4276bc96ee2e0c7a2eadf3cae88e52be55a05fa9053f5"
|
||||
dependencies = [
|
||||
"async-compression",
|
||||
"bitflags",
|
||||
"bitflags 2.11.1",
|
||||
"bytes",
|
||||
"futures-core",
|
||||
"http",
|
||||
|
|
@ -3462,7 +3593,7 @@ version = "0.6.11"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4cfcf7e2740e6fc6d4d688b4ef00650406bb94adf4731e43c096c3a19fe40840"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
"bitflags 2.11.1",
|
||||
"bytes",
|
||||
"futures-util",
|
||||
"http",
|
||||
|
|
@ -3506,7 +3637,7 @@ checksum = "7490cfa5ec963746568740651ac6781f701c9c5ea257c58e057f3ba8cf69e8da"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -3672,6 +3803,12 @@ dependencies = [
|
|||
"wasm-bindgen",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "vcpkg"
|
||||
version = "0.2.15"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
|
||||
|
||||
[[package]]
|
||||
name = "vecmath"
|
||||
version = "1.0.0"
|
||||
|
|
@ -3781,7 +3918,7 @@ dependencies = [
|
|||
"bumpalo",
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
"wasm-bindgen-shared",
|
||||
]
|
||||
|
||||
|
|
@ -3822,7 +3959,7 @@ version = "0.244.0"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
"bitflags 2.11.1",
|
||||
"hashbrown 0.15.5",
|
||||
"indexmap",
|
||||
"semver",
|
||||
|
|
@ -3872,6 +4009,18 @@ version = "0.1.12"
|
|||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a28ac98ddc8b9274cb41bb4d9d4d5c425b6020c50c46f25559911905610b4a88"
|
||||
|
||||
[[package]]
|
||||
name = "which"
|
||||
version = "4.4.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "87ba24419a2078cd2b0f2ede2691b6c66d8e47836da3b6db8265ebad47afbfc7"
|
||||
dependencies = [
|
||||
"either",
|
||||
"home",
|
||||
"once_cell",
|
||||
"rustix 0.38.44",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
|
|
@ -3924,7 +4073,7 @@ checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -3935,7 +4084,7 @@ checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -4166,7 +4315,7 @@ dependencies = [
|
|||
"heck 0.5.0",
|
||||
"indexmap",
|
||||
"prettyplease",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
"wasm-metadata",
|
||||
"wit-bindgen-core",
|
||||
"wit-component",
|
||||
|
|
@ -4182,7 +4331,7 @@ dependencies = [
|
|||
"prettyplease",
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
"wit-bindgen-core",
|
||||
"wit-bindgen-rust",
|
||||
]
|
||||
|
|
@ -4194,7 +4343,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
|
|||
checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
|
||||
dependencies = [
|
||||
"anyhow",
|
||||
"bitflags",
|
||||
"bitflags 2.11.1",
|
||||
"indexmap",
|
||||
"log",
|
||||
"serde",
|
||||
|
|
@ -4255,7 +4404,7 @@ checksum = "de844c262c8848816172cef550288e7dc6c7b7814b4ee56b3e1553f275f1858e"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
"synstructure",
|
||||
]
|
||||
|
||||
|
|
@ -4276,7 +4425,7 @@ checksum = "70e3cd084b1788766f53af483dd21f93881ff30d7320490ec3ef7526d203bad4"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
@ -4296,7 +4445,7 @@ checksum = "11532158c46691caf0f2593ea8358fed6bbf68a0315e80aae9bd41fbade684a1"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
"synstructure",
|
||||
]
|
||||
|
||||
|
|
@ -4336,7 +4485,7 @@ checksum = "625dc425cab0dca6dc3c3319506e6593dcb08a9f387ea3b284dbd52a92c40555"
|
|||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"syn 2.0.117",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
|
|||
|
|
@ -11,6 +11,7 @@ publish = true
|
|||
anyhow = { workspace = true }
|
||||
hex = "0.4"
|
||||
image = { version = "0.25", optional = true }
|
||||
leptonica-plumbing = { version = "1.4", optional = true }
|
||||
pdfium-render = { version = "0.9", optional = true }
|
||||
indexmap = "2.2"
|
||||
flate2 = { workspace = true }
|
||||
|
|
@ -34,7 +35,7 @@ tracing = { workspace = true }
|
|||
default = ["serde"]
|
||||
serde = ["dep:serde", "dep:serde_json"]
|
||||
receipts = [] # Enable visual citation receipts (SVG clip generation)
|
||||
ocr = ["dep:image"] # Enable OCR path (image compositing)
|
||||
ocr = ["dep:image", "dep:leptonica-plumbing"] # Enable OCR path (image compositing + preprocessing)
|
||||
full-render = ["dep:pdfium-render", "ocr"] # Enable PDFium-based rendering (requires ocr)
|
||||
proptest = []
|
||||
fuzzing = [] # Enable cfg(fuzzing) for fuzz harnesses
|
||||
|
|
|
|||
|
|
@ -621,6 +621,15 @@ pub enum DiagCode {
|
|||
/// Phase origin: 5.2.1
|
||||
ImgUnsupportedFormat,
|
||||
|
||||
/// Deskew angle out of detectable range
|
||||
///
|
||||
/// Emitted when pixDeskew cannot detect a dominant text angle because the
|
||||
/// actual skew exceeds the search range (typically +/- 15 degrees). The image
|
||||
/// is returned unchanged without rotation.
|
||||
///
|
||||
/// Phase origin: 5.3.1
|
||||
ImgDeskewOutOfRange,
|
||||
|
||||
/// Stream data truncated
|
||||
///
|
||||
/// Emitted when a stream has less data than expected based on its declared
|
||||
|
|
@ -827,7 +836,8 @@ impl DiagCode {
|
|||
|
||||
// IMG_*
|
||||
DiagCode::ImgSoftmaskUnsupported
|
||||
| DiagCode::ImgUnsupportedFormat => "IMG",
|
||||
| DiagCode::ImgUnsupportedFormat
|
||||
| DiagCode::ImgDeskewOutOfRange => "IMG",
|
||||
|
||||
// REMOTE_*
|
||||
DiagCode::RemoteFetchInterrupted
|
||||
|
|
@ -916,6 +926,7 @@ impl DiagCode {
|
|||
DiagCode::OcrBrokenVectorUnavailable => "OCR_BROKENVECTOR_UNAVAILABLE",
|
||||
DiagCode::ImgSoftmaskUnsupported => "IMG_SOFTMASK_UNSUPPORTED",
|
||||
DiagCode::ImgUnsupportedFormat => "IMG_UNSUPPORTED_FORMAT",
|
||||
DiagCode::ImgDeskewOutOfRange => "IMG_DESKEW_OUT_OF_RANGE",
|
||||
DiagCode::StreamTruncated => "STREAM_TRUNCATED",
|
||||
DiagCode::RemoteFetchInterrupted => "REMOTE_FETCH_INTERRUPTED",
|
||||
DiagCode::RemoteNoRangeSupport => "REMOTE_NO_RANGE_SUPPORT",
|
||||
|
|
@ -995,6 +1006,7 @@ impl DiagCode {
|
|||
| DiagCode::OcrBrokenVectorUnavailable
|
||||
| DiagCode::ImgSoftmaskUnsupported
|
||||
| DiagCode::ImgUnsupportedFormat
|
||||
| DiagCode::ImgDeskewOutOfRange
|
||||
| DiagCode::StreamTruncated
|
||||
| DiagCode::RemoteNoRangeSupport
|
||||
| DiagCode::GstateStackOverflow
|
||||
|
|
@ -1506,6 +1518,14 @@ pub const DIAGNOSTIC_CATALOG: &[DiagInfo] = &[
|
|||
phase: "5.2.1",
|
||||
suggested_action: "Image format or bits-per-component not supported; image is skipped",
|
||||
},
|
||||
DiagInfo {
|
||||
code: DiagCode::ImgDeskewOutOfRange,
|
||||
category: "IMG",
|
||||
severity: Severity::Warning,
|
||||
recoverable: true,
|
||||
phase: "5.3.1",
|
||||
suggested_action: "Skew angle exceeds detection range (typically +/- 15 deg); image returned unchanged",
|
||||
},
|
||||
DiagInfo {
|
||||
code: DiagCode::StreamTruncated,
|
||||
category: "STREAM",
|
||||
|
|
|
|||
|
|
@ -10,6 +10,8 @@ pub mod diagnostics;
|
|||
#[cfg(feature = "ocr")]
|
||||
pub mod dpi;
|
||||
pub mod document;
|
||||
#[cfg(feature = "ocr")]
|
||||
pub mod preprocess;
|
||||
pub mod extract;
|
||||
pub mod fingerprint;
|
||||
pub mod font;
|
||||
|
|
|
|||
332
crates/pdftract-core/src/preprocess.rs
Normal file
332
crates/pdftract-core/src/preprocess.rs
Normal file
|
|
@ -0,0 +1,332 @@
|
|||
//! Image preprocessing pipeline (Phase 5.3).
|
||||
//!
|
||||
//! This module implements the preprocessing pipeline applied to raster images
|
||||
//! before Tesseract OCR invocation. The pipeline is:
|
||||
//! 1. **Deskew:** Hough line transform via pixDeskew; skip if angle < 0.3°
|
||||
//! 2. **Contrast normalization:** Histogram stretch to [0, 255]
|
||||
//! 3. **Binarization:** Sauvola (physical scans) or Otsu (digital)
|
||||
//! 4. **Denoising:** 3×3 median filter
|
||||
//! 5. **Border padding:** Add 10px white border
|
||||
//!
|
||||
//! # Feature Gate
|
||||
//!
|
||||
//! This module is only available when the `ocr` feature is enabled.
|
||||
|
||||
#![cfg(feature = "ocr")]
|
||||
|
||||
use crate::diagnostics::{Diagnostic, DiagCode};
|
||||
use image::{GrayImage, ImageBuffer, Luma};
|
||||
use std::ffi::c_float;
|
||||
|
||||
/// Result type for preprocessing operations.
|
||||
pub type Result<T> = std::result::Result<T, Vec<Diagnostic>>;
|
||||
|
||||
/// Minimum skew angle threshold in degrees.
|
||||
///
|
||||
/// Skew angles below this threshold are considered negligible and the image
|
||||
/// is returned unchanged. This avoids unnecessary rotation for near-level scans.
|
||||
const DESKEW_THRESHOLD_DEG: f64 = 0.3;
|
||||
|
||||
/// Maximum skew angle that pixDeskew can detect in degrees.
|
||||
///
|
||||
/// Angles outside this range will be reported as "no skew found" and the
|
||||
/// function returns the input unchanged.
|
||||
const DESKEW_MAX_RANGE_DEG: f64 = 15.0;
|
||||
|
||||
/// Deskew a grayscale image using leptonica's pixFindSkewAndDeskew (Hough transform).
|
||||
///
|
||||
/// This function detects the dominant text angle in the image using a Hough
|
||||
/// line transform. If the detected angle is >= 0.3 degrees, the image is
|
||||
/// rotated by the negative of that angle to correct the skew. Otherwise,
|
||||
/// the image is returned unchanged.
|
||||
///
|
||||
/// # Arguments
|
||||
///
|
||||
/// * `image` - Input grayscale image
|
||||
///
|
||||
/// # Returns
|
||||
///
|
||||
/// A tuple of (deskewed image, detected angle in degrees, diagnostics).
|
||||
/// If no significant skew is detected, the original image is returned with angle = 0.0.
|
||||
///
|
||||
/// # Critical considerations
|
||||
///
|
||||
/// - **DO NOT pre-binarize** for skew detection — pixFindSkewAndDeskew works on any depth
|
||||
/// - The detected angle is deterministic for the same input
|
||||
/// - Rotation preserves aspect ratio and pads with white (no cropping)
|
||||
/// - Performance: < 100 ms per 8.5x11 page at 300 DPI
|
||||
///
|
||||
/// # Example
|
||||
///
|
||||
/// ```ignore
|
||||
/// use pdftract_core::preprocess::deskew;
|
||||
/// use image::GrayImage;
|
||||
///
|
||||
/// let original: GrayImage = // ... load image
|
||||
/// let (deskewed, angle, diagnostics) = deskew(&original)?;
|
||||
///
|
||||
/// if angle.abs() >= 0.3 {
|
||||
/// println!("Deskewed by {} degrees", angle);
|
||||
/// } else {
|
||||
/// println!("No significant skew detected");
|
||||
/// }
|
||||
/// ```
|
||||
pub fn deskew(image: &GrayImage) -> Result<(GrayImage, f64, Vec<Diagnostic>)> {
|
||||
use leptonica_plumbing::leptonica_sys::{
|
||||
pixDestroy, pixFindSkewAndDeskew, pixGetWidth, pixGetHeight, pixGetDepth,
|
||||
Pix, l_float32, l_int32,
|
||||
};
|
||||
|
||||
let mut diagnostics = Vec::new();
|
||||
|
||||
// Convert GrayImage to leptonica Pix
|
||||
let pix = grayimage_to_pix(image)?;
|
||||
|
||||
// Call pixFindSkewAndDeskew to detect the skew angle and deskew
|
||||
let (deskewed_pix, angle) = unsafe {
|
||||
let mut angle: l_float32 = 0.0;
|
||||
let mut conf: l_float32 = 0.0;
|
||||
|
||||
// redsearch = 0 means use default reduction factor for binary search
|
||||
// Returns deskewed pix if angle is significant, otherwise returns a clone
|
||||
let result = pixFindSkewAndDeskew(pix, 0, &mut angle, &mut conf);
|
||||
|
||||
if result.is_null() {
|
||||
pixDestroy(pix);
|
||||
let diagnostics = vec![Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgUnsupportedFormat,
|
||||
"pixFindSkewAndDeskew returned null",
|
||||
)];
|
||||
return Err(diagnostics);
|
||||
}
|
||||
|
||||
let angle_deg = angle as f64;
|
||||
|
||||
// Check if angle is below the threshold (function returns clone for small angles)
|
||||
if angle_deg.abs() < DESKEW_THRESHOLD_DEG {
|
||||
pixDestroy(result);
|
||||
pixDestroy(pix);
|
||||
return Ok((image.clone(), 0.0, diagnostics));
|
||||
}
|
||||
|
||||
// Check if angle is within the expected detection range
|
||||
// pixFindSkewAndDeskew typically searches within ±7 degrees by default
|
||||
if angle_deg.abs() > DESKEW_MAX_RANGE_DEG {
|
||||
pixDestroy(result);
|
||||
pixDestroy(pix);
|
||||
diagnostics.push(Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgDeskewOutOfRange,
|
||||
format!("Skew angle {}° exceeds detection range (±{}°)", angle_deg, DESKEW_MAX_RANGE_DEG),
|
||||
));
|
||||
return Ok((image.clone(), angle_deg, diagnostics));
|
||||
}
|
||||
|
||||
(result, angle_deg)
|
||||
};
|
||||
|
||||
// Convert back to GrayImage
|
||||
let result_image = pix_to_grayimage(deskewed_pix)?;
|
||||
|
||||
// Clean up
|
||||
unsafe {
|
||||
pixDestroy(deskewed_pix);
|
||||
}
|
||||
|
||||
Ok((result_image, angle, diagnostics))
|
||||
}
|
||||
|
||||
/// Convert a GrayImage to a leptonica Pix.
|
||||
///
|
||||
/// Creates an 8-bit grayscale Pix from the image data.
|
||||
fn grayimage_to_pix(image: &GrayImage) -> Result<*mut Pix> {
|
||||
use leptonica_plumbing::leptonica_sys::{
|
||||
pixCreate, pixDestroy, pixGetData, Pix,
|
||||
};
|
||||
use std::ptr;
|
||||
|
||||
let width = image.width() as i32;
|
||||
let height = image.height() as i32;
|
||||
const DEPTH: i32 = 8;
|
||||
|
||||
unsafe {
|
||||
let pix = pixCreate(width, height, DEPTH);
|
||||
|
||||
if pix.is_null() {
|
||||
let diagnostics = vec![Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgUnsupportedFormat,
|
||||
"Failed to create leptonica Pix for deskew",
|
||||
)];
|
||||
return Err(diagnostics);
|
||||
}
|
||||
|
||||
// Get the data pointer from the Pix
|
||||
let pix_data = pixGetData(pix);
|
||||
|
||||
if pix_data.is_null() {
|
||||
pixDestroy(pix);
|
||||
let diagnostics = vec![Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgUnsupportedFormat,
|
||||
"Failed to get pixel data pointer from Pix",
|
||||
)];
|
||||
return Err(diagnostics);
|
||||
}
|
||||
|
||||
// Copy pixel data from GrayImage to Pix
|
||||
// Pix stores data as l_uint32* (4-byte words), but for 8 bpp each pixel is one byte
|
||||
let raw_data = image.as_raw();
|
||||
let len = raw_data.len();
|
||||
|
||||
// Copy byte by byte
|
||||
for i in 0..len {
|
||||
*pix_data.add(i) = raw_data[i] as u32;
|
||||
}
|
||||
|
||||
Ok(pix)
|
||||
}
|
||||
}
|
||||
|
||||
/// Convert a leptonica Pix to a GrayImage.
|
||||
///
|
||||
/// Expects an 8-bit grayscale Pix.
|
||||
fn pix_to_grayimage(pix: *mut Pix) -> Result<GrayImage> {
|
||||
use leptonica_plumbing::leptonica_sys::{
|
||||
pixGetData, pixGetWidth, pixGetHeight, pixGetDepth, Pix,
|
||||
};
|
||||
|
||||
unsafe {
|
||||
if pix.is_null() {
|
||||
let diagnostics = vec![Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgUnsupportedFormat,
|
||||
"Null Pix pointer in pix_to_grayimage",
|
||||
)];
|
||||
return Err(diagnostics);
|
||||
}
|
||||
|
||||
let width = pixGetWidth(pix) as u32;
|
||||
let height = pixGetHeight(pix) as u32;
|
||||
let depth = pixGetDepth(pix) as u32;
|
||||
|
||||
if depth != 8 {
|
||||
let diagnostics = vec![Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgUnsupportedFormat,
|
||||
format!("Unsupported Pix depth {} (expected 8)", depth),
|
||||
)];
|
||||
return Err(diagnostics);
|
||||
}
|
||||
|
||||
let data_ptr = pixGetData(pix);
|
||||
|
||||
if data_ptr.is_null() {
|
||||
let diagnostics = vec![Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgUnsupportedFormat,
|
||||
"Null data pointer in Pix",
|
||||
)];
|
||||
return Err(diagnostics);
|
||||
}
|
||||
|
||||
// Copy the pixel data into a GrayImage
|
||||
let len = (width * height) as usize;
|
||||
let mut buffer = Vec::with_capacity(len);
|
||||
|
||||
// Copy pixel data (stored as u32 but each pixel is 1 byte for 8 bpp)
|
||||
for i in 0..len {
|
||||
buffer.push(*data_ptr.add(i) as u8);
|
||||
}
|
||||
|
||||
GrayImage::from_raw(width, height, buffer).ok_or_else(|| {
|
||||
vec![Diagnostic::with_static_no_offset(
|
||||
DiagCode::ImgUnsupportedFormat,
|
||||
"Failed to create GrayImage from Pix data",
|
||||
)]
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
/// Create a simple test pattern with horizontal lines.
|
||||
fn create_horizontal_lines_image() -> GrayImage {
|
||||
let mut img = GrayImage::new(200, 100);
|
||||
for y in 0..100 {
|
||||
for x in 0..200 {
|
||||
let pixel = if y % 10 < 5 { 0 } else { 255 };
|
||||
img.put_pixel(x, y, Luma([pixel]));
|
||||
}
|
||||
}
|
||||
img
|
||||
}
|
||||
|
||||
/// Create a simple test pattern with vertical lines.
|
||||
fn create_vertical_lines_image() -> GrayImage {
|
||||
let mut img = GrayImage::new(100, 200);
|
||||
for y in 0..200 {
|
||||
for x in 0..100 {
|
||||
let pixel = if x % 10 < 5 { 0 } else { 255 };
|
||||
img.put_pixel(x, y, Luma([pixel]));
|
||||
}
|
||||
}
|
||||
img
|
||||
}
|
||||
|
||||
/// Create a solid white image.
|
||||
fn create_white_image() -> GrayImage {
|
||||
GrayImage::from_pixel(200, 100, Luma([255]))
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_deskew_horizontal_lines() {
|
||||
// Horizontal lines should have 0° skew
|
||||
let img = create_horizontal_lines_image();
|
||||
let (deskewed, angle, diagnostics) = deskew(&img).expect("Deskew failed");
|
||||
|
||||
assert!(angle.abs() < 0.1, "Angle should be near 0°, got {}", angle);
|
||||
assert!(!diagnostics.iter().any(|d| d.code == DiagCode::ImgDeskewOutOfRange));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_deskew_white_image() {
|
||||
// White image should have no detectable skew
|
||||
let img = create_white_image();
|
||||
let (deskewed, angle, diagnostics) = deskew(&img).expect("Deskew failed");
|
||||
|
||||
assert_eq!(angle, 0.0, "Angle should be exactly 0° for white image");
|
||||
assert!(diagnostics.is_empty());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_grayimage_to_pix_roundtrip() {
|
||||
let img = create_horizontal_lines_image();
|
||||
let pix = grayimage_to_pix(&img).expect("Failed to convert to Pix");
|
||||
|
||||
// Check that the Pix was created successfully
|
||||
unsafe {
|
||||
use leptonica_plumbing::leptonica_sys::{pixGetWidth, pixGetHeight, pixGetDepth, pixDestroy};
|
||||
|
||||
assert!(!pix.is_null(), "Pix pointer should not be null");
|
||||
assert_eq!(pixGetWidth(pix) as u32, img.width());
|
||||
assert_eq!(pixGetHeight(pix) as u32, img.height());
|
||||
assert_eq!(pixGetDepth(pix) as u32, 8);
|
||||
|
||||
pixDestroy(pix);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_pix_to_grayimage_roundtrip() {
|
||||
let img = create_horizontal_lines_image();
|
||||
let pix = grayimage_to_pix(&img).expect("Failed to convert to Pix");
|
||||
|
||||
let converted = pix_to_grayimage(pix).expect("Failed to convert back");
|
||||
|
||||
// Clean up
|
||||
unsafe {
|
||||
use leptonica_plumbing::leptonica_sys::pixDestroy;
|
||||
pixDestroy(pix);
|
||||
}
|
||||
|
||||
assert_eq!(converted.width(), img.width());
|
||||
assert_eq!(converted.height(), img.height());
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue