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276 changes: 138 additions & 138 deletions
276
src/main/java/com/recognition/software/jdeskew/ImageUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,138 +1,138 @@ | ||
| /** | ||
| * <a url=http://www.jdeskew.com/>JDeskew</a> | ||
| */ | ||
| package com.recognition.software.jdeskew; | ||
|
|
||
| import java.awt.Color; | ||
| import java.awt.Graphics2D; | ||
| import java.awt.RenderingHints; | ||
| import java.awt.geom.AffineTransform; | ||
| import java.awt.image.BufferedImage; | ||
| import java.awt.image.WritableRaster; | ||
|
|
||
| import net.sourceforge.tess4j.util.LoggHelper; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| public class ImageUtil { | ||
|
|
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| private static final Logger logger = LoggerFactory.getLogger(new LoggHelper().toString()); | ||
|
|
||
| /** | ||
| * Whether the pixel is black. | ||
| * | ||
| * @param image source image | ||
| * @param x | ||
| * @param y | ||
| * @return | ||
| */ | ||
| public static boolean isBlack(BufferedImage image, int x, int y) { | ||
| if (image.getType() == BufferedImage.TYPE_BYTE_BINARY) { | ||
| WritableRaster raster = image.getRaster(); | ||
| int pixelRGBValue = raster.getSample(x, y, 0); | ||
| return pixelRGBValue == 0; | ||
| } | ||
|
|
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| int luminanceValue = 140; | ||
| return isBlack(image, x, y, luminanceValue); | ||
| } | ||
|
|
||
| /** | ||
| * Whether the pixel is black. | ||
| * | ||
| * @param image source image | ||
| * @param x | ||
| * @param y | ||
| * @param luminanceCutOff | ||
| * @return | ||
| */ | ||
| public static boolean isBlack(BufferedImage image, int x, int y, int luminanceCutOff) { | ||
| int pixelRGBValue; | ||
| int r; | ||
| int g; | ||
| int b; | ||
| double luminance = 0.0; | ||
|
|
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| // return white on areas outside of image boundaries | ||
| if (x < 0 || y < 0 || x > image.getWidth() || y > image.getHeight()) { | ||
| return false; | ||
| } | ||
|
|
||
| try { | ||
| pixelRGBValue = image.getRGB(x, y); | ||
| r = (pixelRGBValue >> 16) & 0xff; | ||
| g = (pixelRGBValue >> 8) & 0xff; | ||
| b = (pixelRGBValue) & 0xff; | ||
| luminance = (r * 0.299) + (g * 0.587) + (b * 0.114); | ||
| } catch (Exception e) { | ||
| logger.warn("", e); | ||
| } | ||
|
|
||
| return luminance < luminanceCutOff; | ||
| } | ||
|
|
||
| /** | ||
| * Rotates image. | ||
| * | ||
| * @param image source image | ||
| * @param angle by degrees | ||
| * @param cx x-coordinate of pivot point | ||
| * @param cy y-coordinate of pivot point | ||
| * @return rotated image | ||
| */ | ||
| public static BufferedImage rotate(BufferedImage image, double angle, int cx, int cy) { | ||
| int width = image.getWidth(null); | ||
| int height = image.getHeight(null); | ||
|
|
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| int minX, minY, maxX, maxY; | ||
| minX = minY = maxX = maxY = 0; | ||
|
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| int[] corners = {0, 0, width, 0, width, height, 0, height}; | ||
|
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| double theta = Math.toRadians(angle); | ||
| for (int i = 0; i < corners.length; i += 2) { | ||
| int x = (int) (Math.cos(theta) * (corners[i] - cx) | ||
| - Math.sin(theta) * (corners[i + 1] - cy) + cx); | ||
| int y = (int) (Math.sin(theta) * (corners[i] - cx) | ||
| + Math.cos(theta) * (corners[i + 1] - cy) + cy); | ||
|
|
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| if (x > maxX) { | ||
| maxX = x; | ||
| } | ||
|
|
||
| if (x < minX) { | ||
| minX = x; | ||
| } | ||
|
|
||
| if (y > maxY) { | ||
| maxY = y; | ||
| } | ||
|
|
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| if (y < minY) { | ||
| minY = y; | ||
| } | ||
|
|
||
| } | ||
|
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| cx = (cx - minX); | ||
| cy = (cy - minY); | ||
|
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| BufferedImage bi = new BufferedImage((maxX - minX), (maxY - minY), | ||
| image.getType()); | ||
| Graphics2D g2 = bi.createGraphics(); | ||
| g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, | ||
| RenderingHints.VALUE_INTERPOLATION_BICUBIC); | ||
|
|
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| g2.setBackground(Color.white); | ||
| g2.fillRect(0, 0, bi.getWidth(), bi.getHeight()); | ||
|
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| AffineTransform at = new AffineTransform(); | ||
| at.rotate(theta, cx, cy); | ||
|
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| g2.setTransform(at); | ||
| g2.drawImage(image, -minX, -minY, null); | ||
| g2.dispose(); | ||
|
|
||
| return bi; | ||
| } | ||
| } | ||
| /** | ||
| * <a url=http://www.jdeskew.com/>JDeskew</a> | ||
| */ | ||
| package com.recognition.software.jdeskew; | ||
|
|
||
| import java.awt.Color; | ||
| import java.awt.Graphics2D; | ||
| import java.awt.RenderingHints; | ||
| import java.awt.geom.AffineTransform; | ||
| import java.awt.image.BufferedImage; | ||
| import java.awt.image.WritableRaster; | ||
|
|
||
| import net.sourceforge.tess4j.util.LoggHelper; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| public class ImageUtil { | ||
|
|
||
| private static final Logger logger = LoggerFactory.getLogger(new LoggHelper().toString()); | ||
|
|
||
| /** | ||
| * Whether the pixel is black. | ||
| * | ||
| * @param image source image | ||
| * @param x x-coordinate | ||
| * @param y y-coordinate | ||
| * @return true if pixel is black; false, otherwise | ||
| */ | ||
| public static boolean isBlack(BufferedImage image, int x, int y) { | ||
| if (image.getType() == BufferedImage.TYPE_BYTE_BINARY) { | ||
| WritableRaster raster = image.getRaster(); | ||
| int pixelRGBValue = raster.getSample(x, y, 0); | ||
| return pixelRGBValue == 0; | ||
| } | ||
|
|
||
| int luminanceValue = 140; | ||
| return isBlack(image, x, y, luminanceValue); | ||
| } | ||
|
|
||
| /** | ||
| * Whether the pixel is black. | ||
| * | ||
| * @param image source image | ||
| * @param x x-coordinate | ||
| * @param y y-coordinate | ||
| * @param luminanceCutOff luminance threshold | ||
| * @return true if pixel is black; false, otherwise | ||
| */ | ||
| public static boolean isBlack(BufferedImage image, int x, int y, int luminanceCutOff) { | ||
| int pixelRGBValue; | ||
| int r; | ||
| int g; | ||
| int b; | ||
| double luminance = 0.0; | ||
|
|
||
| // return white on areas outside of image boundaries | ||
| if (x < 0 || y < 0 || x > image.getWidth() || y > image.getHeight()) { | ||
| return false; | ||
| } | ||
|
|
||
| try { | ||
| pixelRGBValue = image.getRGB(x, y); | ||
| r = (pixelRGBValue >> 16) & 0xff; | ||
| g = (pixelRGBValue >> 8) & 0xff; | ||
| b = (pixelRGBValue) & 0xff; | ||
| luminance = (r * 0.299) + (g * 0.587) + (b * 0.114); | ||
| } catch (Exception e) { | ||
| logger.warn("", e); | ||
| } | ||
|
|
||
| return luminance < luminanceCutOff; | ||
| } | ||
|
|
||
| /** | ||
| * Rotates image. | ||
| * | ||
| * @param image source image | ||
| * @param angle by degrees | ||
| * @param cx x-coordinate of pivot point | ||
| * @param cy y-coordinate of pivot point | ||
| * @return rotated image | ||
| */ | ||
| public static BufferedImage rotate(BufferedImage image, double angle, int cx, int cy) { | ||
| int width = image.getWidth(null); | ||
| int height = image.getHeight(null); | ||
|
|
||
| int minX, minY, maxX, maxY; | ||
| minX = minY = maxX = maxY = 0; | ||
|
|
||
| int[] corners = {0, 0, width, 0, width, height, 0, height}; | ||
|
|
||
| double theta = Math.toRadians(angle); | ||
| for (int i = 0; i < corners.length; i += 2) { | ||
| int x = (int) (Math.cos(theta) * (corners[i] - cx) | ||
| - Math.sin(theta) * (corners[i + 1] - cy) + cx); | ||
| int y = (int) (Math.sin(theta) * (corners[i] - cx) | ||
| + Math.cos(theta) * (corners[i + 1] - cy) + cy); | ||
|
|
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| if (x > maxX) { | ||
| maxX = x; | ||
| } | ||
|
|
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| if (x < minX) { | ||
| minX = x; | ||
| } | ||
|
|
||
| if (y > maxY) { | ||
| maxY = y; | ||
| } | ||
|
|
||
| if (y < minY) { | ||
| minY = y; | ||
| } | ||
|
|
||
| } | ||
|
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| cx = (cx - minX); | ||
| cy = (cy - minY); | ||
|
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| BufferedImage bi = new BufferedImage((maxX - minX), (maxY - minY), | ||
| image.getType()); | ||
| Graphics2D g2 = bi.createGraphics(); | ||
| g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, | ||
| RenderingHints.VALUE_INTERPOLATION_BICUBIC); | ||
|
|
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| g2.setBackground(Color.white); | ||
| g2.fillRect(0, 0, bi.getWidth(), bi.getHeight()); | ||
|
|
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| AffineTransform at = new AffineTransform(); | ||
| at.rotate(theta, cx, cy); | ||
|
|
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| g2.setTransform(at); | ||
| g2.drawImage(image, -minX, -minY, null); | ||
| g2.dispose(); | ||
|
|
||
| return bi; | ||
| } | ||
| } |
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters