Working reverse transformation

master
Kuba Orlik 3 years ago
commit 8c4fd2d4cc

5
.gitignore vendored

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@ -0,0 +1,19 @@
{
"name": "zlgaszansko2",
"version": "1.0.0",
"description": "",
"main": "lib/index.js",
"scripts": {
"watch": "npm run build -- --watch",
"build": "tsc"
},
"author": "",
"license": "ISC",
"dependencies": {
"async-spawner": "git+https://git.kuba-orlik.name/kuba/async-spawner.git#7ee6a21",
"tempy": "^1.0.1"
},
"devDependencies": {
"typescript": "^4.2.3"
}
}

@ -0,0 +1,180 @@
import simpleSpawn from "async-spawner";
import tempy from "tempy";
async function perspectiveShift(
input: string,
shift: transformCoefs
): Promise<string> {
const output = tempy.file({ extension: "jpg" });
const args = [
"-verbose",
input,
"-virtual-pixel",
"Transparent",
"-distort",
"PerspectiveProjection",
shift.join(","),
output,
];
console.log(args);
await simpleSpawn("convert", args);
return output; // the file name;
}
type coordinates = { x: number; y: number };
type alpr_candidate = {
plate: string;
confidence: number;
matches_template: 0 | 1;
};
type alpr_response = {
version: number;
data_type: "alpr_results";
epoch_time: number;
img_width: number;
img_height: number;
processing_time_ms: number;
regions_of_interest: {
x: number;
y: number;
width: number;
height: number;
}[];
results: {
plate: string;
confidence: number;
matches_template: 0 | 1;
plate_index: number;
region: string;
region_confidence: number;
processing_time_ms: number;
requested_topn: number;
coordinates: [coordinates, coordinates, coordinates, coordinates];
candidates: alpr_candidate[];
}[];
};
function empty_alpr_response() {
return {
version: 2,
data_type: <const>"alpr_results",
epoch_time: Date.now(),
img_width: 0,
img_height: 0,
processing_time_ms: 0,
regions_of_interest: [],
results: [],
};
}
export default async function alpr(path: string): Promise<alpr_response> {
const result = await simpleSpawn("alpr", [
"-c",
"eu",
"-p",
"pl",
"-j",
path,
]);
return JSON.parse(result.stdout);
}
function newpos(
x: number,
y: number,
t: transformCoefs
): { x: number; y: number } {
return {
x: (x * t[0] + y * t[1] + t[2]) / (t[6] * x + t[7] * y + 1),
y: (x * t[3] + y * t[4] + t[5]) / (t[6] * x + t[7] * y + 1),
};
}
export async function perspectiveAssistedAlpr(
input: string,
shift: transformDesc
) {
const shifted_image = await perspectiveShift(input, shift.forward);
let result = await alpr(shifted_image);
for (const i in result.results) {
result.results[i].coordinates = result.results[i].coordinates.map(
(c) => {
// https://legacy.imagemagick.org/Usage/distorts/#perspective_internals
const ret = newpos(c.x, c.y, shift.backward);
console.log("new coords!", c, "→", ret);
return ret;
}
) as [coordinates, coordinates, coordinates, coordinates];
}
return result;
}
type transformCoefs = [
number,
number,
number,
number,
number,
number,
number,
number
];
type transformDesc = { forward: transformCoefs; backward: transformCoefs };
// See perspective.md to learn how coefficients are created for calls below:
const transforms: transformDesc[] = [
{
forward: [
0.418385,
-0.064912,
1.11204e-12,
-1.07285e-16,
0.407118,
1.85136e-13,
-0.000143964,
-0.0000155811,
],
backward: [
2.39014,
0.381091,
-5.07071e-13,
8.09745e-16,
2.45629,
-1.95474e-12,
0.000344095,
0.0000931351,
],
},
];
export async function alprMultiPersp(input: string): Promise<alpr_response> {
let resolved = false;
return new Promise((resolve, reject) => {
const callback = (arg: alpr_response) => {
if (resolved) {
return;
}
if (arg.results.length === 0) {
return;
}
resolved = true;
resolve(arg);
};
Promise.all([
alpr(input).then(callback),
...transforms.map((transform) =>
perspectiveAssistedAlpr(input, transform).then(callback)
),
])
.then(() => {
if (!resolved) {
resolve(empty_alpr_response());
}
})
.catch(reject);
});
}
console.log(newpos(4040, 0, transforms[0].forward));
console.log(newpos(4040, 0, transforms[0].backward));

@ -0,0 +1,67 @@
import simpleSpawn from "async-spawner";
import tempy from "tempy";
// usage: node ./lib/calculate-perspective-coefficients.js demo.jpg 0 0 0 0 0 3024 -206 1292 4040 3024 4024 3316 4040 0 4040 0
type point = [number, number];
type pair = [point, point];
type transform_points = [pair, pair, pair, pair];
async function getCoefsForPerspective(file: string, points: transform_points) {
const args = [
"-verbose",
file,
"-virtual-pixel",
"Transparent",
"-distort",
"perspective",
points
.map((pair) => pair.map((point) => point.join(",")).join(" "))
.join(" "),
"target.jpg",
];
const result = await simpleSpawn("convert", args);
console.log(args);
return result.stderr
.split("\n")
.slice(3, 5)
.join(" ")
.replace(/'/g, "")
.split(",")
.map((s) => parseFloat(s.trim()));
}
async function run() {
const path = process.argv[2];
const input_points = process.argv;
input_points.shift();
input_points.shift();
input_points.shift();
input_points.map(parseFloat);
const parsed_points = [];
const parsed_reverse_points = [];
for (let i = 0; i <= 3; i++) {
parsed_points.push([
[input_points[i * 4 + 0], input_points[i * 4 + 1]],
[input_points[i * 4 + 2], input_points[i * 4 + 3]],
]);
parsed_reverse_points.push([
[input_points[i * 4 + 2], input_points[i * 4 + 3]],
[input_points[i * 4 + 0], input_points[i * 4 + 1]],
]);
}
const [forward, backward] = await Promise.all([
getCoefsForPerspective(
path,
(parsed_points as unknown) as transform_points
),
getCoefsForPerspective(
path,
(parsed_reverse_points as unknown) as transform_points
),
]);
console.log({ forward, backward });
}
run();

@ -0,0 +1,67 @@
import simpleSpawn, { deferedSpawn } from "async-spawner";
import { promises as fs } from "fs";
import path from "path";
import { alprMultiPersp } from "./alpr";
async function run(): Promise<void> {
const gui = await deferedSpawn("python", [
"/home/kuba/projects/personal/qml-player/main.py",
"/home/kuba/projects/personal/qml-player/template.qml",
]);
const dir =
"/home/kuba/projects/personal/zgłaszańska/03-20_2/problematic_cars";
const files = await fs.readdir(dir);
for (const file of files.filter((f) => f.includes("jpg"))) {
const full_path = path.resolve(dir, file);
void alprMultiPersp(full_path).then((o) => {
console.log("Got coords!");
const { img_width, img_height } = o;
if (o.results.length) {
const min_x = Math.min(
...o.results[0].coordinates.map((c: any) => c.x)
);
const max_x = Math.max(
...o.results[0].coordinates.map((c: any) => c.x)
);
const min_y = Math.min(
...o.results[0].coordinates.map((c: any) => c.y)
);
const max_y = Math.max(
...o.results[0].coordinates.map((c: any) => c.y)
);
// console.log({
// rect_x: min_x / img_width,
// rect_y: min_y / img_height,
// rect_width: (max_x - min_x) / img_width,
// rect_height: (max_y - min_y) / img_height,
// rect_text: o.results[0].candidates[0].plate,
// });
gui.write(
JSON.stringify({
rect_x: min_x / img_width,
rect_y: min_y / img_height,
rect_width: (max_x - min_x) / img_width,
rect_height: (max_y - min_y) / img_height,
rect_text: o.results[0].candidates[0].plate,
})
);
} else {
gui.write(JSON.stringify({ rect_width: 0 }));
}
});
gui.write(
JSON.stringify({
current_image: full_path,
})
);
let input: any;
do {
const raw_event = (await gui.waitForNextData()) as string;
console.log(raw_event);
input = JSON.parse(raw_event);
} while (input.type !== "next");
}
}
run();

@ -0,0 +1,20 @@
# How to calculate parameters for perspective transformation matrix
1. Find a photo that does not get recognized by alpr
2. Open it in gimp
3. Use Perspective tool
4. Find the best transformation that makes the license plate an ideal reectangle by trying to move as little points as possible
5. Take a note of coordinates of each of the points you moved (where they were before and after). Gather change for all four corners, like so:
0,0 → 0,0
0,3024 → -296,1292
4040,3024 → 4024,3316
4040,0 → 4040,0
6. Put those coordinates into the command:
```
node ./lib/calculate-perspective-coefficients.js demo.jpg 0 0 0 0 0 3024 -206 1292 4040 3024 4024 3316 4040 0 4040 0
```
It will output the forward and backward coefficients for the matrix transform.

@ -0,0 +1,19 @@
{
"compilerOptions": {
"module": "commonjs",
"moduleResolution": "node",
"noImplicitAny": true,
"noImplicitThis": true,
"strictNullChecks": true,
"target": "ES2020",
"declaration": true,
"esModuleInterop": true,
"lib": ["es6", "esnext"],
"outDir": "lib",
"checkJs": true,
"allowJs": true,
"declarationDir": "@types",
"sourceMap": true
},
"include": ["src/**/*"]
}
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