// doc imports
/* eslint-disable no-unused-vars */
import {Image} from './image';
/* eslint-enable no-unused-vars */
/**
* Threshold an image between an input minimum and maximum.
*/
export class ThresholdFilter {
/**
* Threshold minimum.
*
* @type {number}
*/
#min = 0;
/**
* Threshold maximum.
*
* @type {number}
*/
#max = 0;
/**
* Get the threshold minimum.
*
* @returns {number} The threshold minimum.
*/
getMin() {
return this.#min;
}
/**
* Set the threshold minimum.
*
* @param {number} val The threshold minimum.
*/
setMin(val) {
this.#min = val;
}
/**
* Get the threshold maximum.
*
* @returns {number} The threshold maximum.
*/
getMax() {
return this.#max;
}
/**
* Set the threshold maximum.
*
* @param {number} val The threshold maximum.
*/
setMax(val) {
this.#max = val;
}
/**
* Get the name of the filter.
*
* @returns {string} The name of the filter.
*/
getName() {
return 'Threshold';
}
/**
* Original image.
*
* @type {Image}
*/
#originalImage = null;
/**
* Set the original image.
*
* @param {Image} image The original image.
*/
setOriginalImage(image) {
this.#originalImage = image;
}
/**
* Get the original image.
*
* @returns {Image} The original image.
*/
getOriginalImage() {
return this.#originalImage;
}
/**
* Transform the main image using this filter.
*
* @returns {Image} The transformed image.
*/
update() {
const image = this.getOriginalImage();
const imageMin = image.getDataRange().min;
const threshFunction = (value) => {
if (value < this.getMin() || value > this.getMax()) {
return imageMin;
} else {
return value;
}
};
return image.transform(threshFunction);
}
} // class Threshold
/**
* Sharpen an image using a sharpen convolution matrix.
*/
export class SharpenFilter {
/**
* Get the name of the filter.
*
* @returns {string} The name of the filter.
*/
getName() {
return 'Sharpen';
}
/**
* Original image.
*
* @type {Image}
*/
#originalImage = null;
/**
* Set the original image.
*
* @param {Image} image The original image.
*/
setOriginalImage(image) {
this.#originalImage = image;
}
/**
* Get the original image.
*
* @returns {Image} The original image.
*/
getOriginalImage() {
return this.#originalImage;
}
/**
* Transform the main image using this filter.
*
* @returns {Image} The transformed image.
*/
update() {
const image = this.getOriginalImage();
/* eslint-disable @stylistic/js/array-element-newline */
return image.convolute2D([
0, -1, 0,
-1, 5, -1,
0, -1, 0
]);
/* eslint-enable @stylistic/js/array-element-newline */
}
} // class Sharpen
/**
* Apply a Sobel filter to an image.
*/
export class SobelFilter {
/**
* Get the name of the filter.
*
* @returns {string} The name of the filter.
*/
getName() {
return 'Sobel';
}
/**
* Original image.
*
* @type {Image}
*/
#originalImage = null;
/**
* Set the original image.
*
* @param {Image} image The original image.
*/
setOriginalImage(image) {
this.#originalImage = image;
}
/**
* Get the original image.
*
* @returns {Image} The original image.
*/
getOriginalImage() {
return this.#originalImage;
}
/**
* Transform the main image using this filter.
*
* @returns {Image} The transformed image.
*/
update() {
const image = this.getOriginalImage();
/* eslint-disable @stylistic/js/array-element-newline */
const gradX = image.convolute2D([
1, 0, -1,
2, 0, -2,
1, 0, -1
]);
const gradY = image.convolute2D([
1, 2, 1,
0, 0, 0,
-1, -2, -1
]);
/* eslint-enable @stylistic/js/array-element-newline */
return gradX.compose(gradY, function (x, y) {
return Math.sqrt(x * x + y * y);
});
}
} // class Sobel