Android(安卓)处理图片（ 图像二值化、锐化、转换格式）
16lz
2021-01-26
package net.wealthgod.client.center.ocr;import java.awt.Graphics2D;import java.awt.color.ColorSpace;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.awt.image.ColorConvertOp;import java.awt.image.ColorModel;import java.awt.image.MemoryImageSource;import java.awt.image.PixelGrabber;public class ImageFilter{private BufferedImage image;private int iw, ih;private int[] pixels;public ImageFilter(BufferedImage image){this.image = image;iw = image.getWidth();ih = image.getHeight();pixels = new int[iw * ih];}/** 图像二值化 */public BufferedImage changeGrey(){PixelGrabber pg = new PixelGrabber(image.getSource(), 0, 0, iw, ih,pixels, 0, iw);try{pg.grabPixels();} catch (InterruptedException e){e.printStackTrace();}// 设定二值化的域值，默认值为100int grey = 100;// 对图像进行二值化处理，Alpha值保持不变ColorModel cm = ColorModel.getRGBdefault();for (int i = 0; i < iw * ih; i++){int red, green, blue;int alpha = cm.getAlpha(pixels[i]);if (cm.getRed(pixels[i]) > grey){red = 255;} else{red = 0;}if (cm.getGreen(pixels[i]) > grey){green = 255;} else{green = 0;}if (cm.getBlue(pixels[i]) > grey){blue = 255;} else{blue = 0;}pixels[i] = alpha << 24 | red << 16 | green << 8 | blue;}// 将数组中的象素产生一个图像return ImageIOHelper.imageProducerToBufferedImage(new MemoryImageSource(iw, ih,pixels, 0, iw));}/** 提升清晰度,进行锐化 */public BufferedImage sharp(){PixelGrabber pg = new PixelGrabber(image.getSource(), 0, 0, iw, ih,pixels, 0, iw);try{pg.grabPixels();} catch (InterruptedException e){e.printStackTrace();}// 象素的中间变量int tempPixels[] = new int[iw * ih];for (int i = 0; i < iw * ih; i++){tempPixels[i] = pixels[i];}// 对图像进行尖锐化处理，Alpha值保持不变ColorModel cm = ColorModel.getRGBdefault();for (int i = 1; i < ih - 1; i++){for (int j = 1; j < iw - 1; j++){int alpha = cm.getAlpha(pixels[i * iw + j]);// 对图像进行尖锐化int red6 = cm.getRed(pixels[i * iw + j + 1]);int red5 = cm.getRed(pixels[i * iw + j]);int red8 = cm.getRed(pixels[(i + 1) * iw + j]);int sharpRed = Math.abs(red6 - red5) + Math.abs(red8 - red5);int green5 = cm.getGreen(pixels[i * iw + j]);int green6 = cm.getGreen(pixels[i * iw + j + 1]);int green8 = cm.getGreen(pixels[(i + 1) * iw + j]);int sharpGreen = Math.abs(green6 - green5)+ Math.abs(green8 - green5);int blue5 = cm.getBlue(pixels[i * iw + j]);int blue6 = cm.getBlue(pixels[i * iw + j + 1]);int blue8 = cm.getBlue(pixels[(i + 1) * iw + j]);int sharpBlue = Math.abs(blue6 - blue5)+ Math.abs(blue8 - blue5);if (sharpRed > 255){sharpRed = 255;}if (sharpGreen > 255){sharpGreen = 255;}if (sharpBlue > 255){sharpBlue = 255;}tempPixels[i * iw + j] = alpha << 24 | sharpRed << 16| sharpGreen << 8 | sharpBlue;}}// 将数组中的象素产生一个图像return ImageIOHelper.imageProducerToBufferedImage(new MemoryImageSource(iw, ih,tempPixels, 0, iw));}/** 中值滤波 */public BufferedImage median(){PixelGrabber pg = new PixelGrabber(image.getSource(), 0, 0, iw, ih,pixels, 0, iw);try{pg.grabPixels();} catch (InterruptedException e){e.printStackTrace();}// 对图像进行中值滤波，Alpha值保持不变ColorModel cm = ColorModel.getRGBdefault();for (int i = 1; i < ih - 1; i++){for (int j = 1; j < iw - 1; j++){int red, green, blue;int alpha = cm.getAlpha(pixels[i * iw + j]);// int red2 = cm.getRed(pixels[(i - 1) * iw + j]);int red4 = cm.getRed(pixels[i * iw + j - 1]);int red5 = cm.getRed(pixels[i * iw + j]);int red6 = cm.getRed(pixels[i * iw + j + 1]);// int red8 = cm.getRed(pixels[(i + 1) * iw + j]);// 水平方向进行中值滤波if (red4 >= red5){if (red5 >= red6){red = red5;} else{if (red4 >= red6){red = red6;} else{red = red4;}}} else{if (red4 > red6){red = red4;} else{if (red5 > red6){red = red6;} else{red = red5;}}}// int green2 = cm.getGreen(pixels[(i - 1) * iw + j]);int green4 = cm.getGreen(pixels[i * iw + j - 1]);int green5 = cm.getGreen(pixels[i * iw + j]);int green6 = cm.getGreen(pixels[i * iw + j + 1]);// int green8 = cm.getGreen(pixels[(i + 1) * iw + j]);// 水平方向进行中值滤波if (green4 >= green5){if (green5 >= green6){green = green5;} else{if (green4 >= green6){green = green6;} else{green = green4;}}} else{if (green4 > green6){green = green4;} else{if (green5 > green6){green = green6;} else{green = green5;}}}// int blue2 = cm.getBlue(pixels[(i - 1) * iw + j]);int blue4 = cm.getBlue(pixels[i * iw + j - 1]);int blue5 = cm.getBlue(pixels[i * iw + j]);int blue6 = cm.getBlue(pixels[i * iw + j + 1]);// int blue8 = cm.getBlue(pixels[(i + 1) * iw + j]);// 水平方向进行中值滤波if (blue4 >= blue5){if (blue5 >= blue6){blue = blue5;} else{if (blue4 >= blue6){blue = blue6;} else{blue = blue4;}}} else{if (blue4 > blue6){blue = blue4;} else{if (blue5 > blue6){blue = blue6;} else{blue = blue5;}}}pixels[i * iw + j] = alpha << 24 | red << 16 | green << 8| blue;}}// 将数组中的象素产生一个图像return ImageIOHelper.imageProducerToBufferedImage(new MemoryImageSource(iw, ih,pixels, 0, iw));}/** 线性灰度变换 */public BufferedImage lineGrey(){PixelGrabber pg = new PixelGrabber(image.getSource(), 0, 0, iw, ih,pixels, 0, iw);try{pg.grabPixels();} catch (InterruptedException e){e.printStackTrace();}// 对图像进行进行线性拉伸，Alpha值保持不变ColorModel cm = ColorModel.getRGBdefault();for (int i = 0; i < iw * ih; i++){int alpha = cm.getAlpha(pixels[i]);int red = cm.getRed(pixels[i]);int green = cm.getGreen(pixels[i]);int blue = cm.getBlue(pixels[i]);// 增加了图像的亮度red = (int) (1.1 * red + 30);green = (int) (1.1 * green + 30);blue = (int) (1.1 * blue + 30);if (red >= 255){red = 255;}if (green >= 255){green = 255;}if (blue >= 255){blue = 255;}pixels[i] = alpha << 24 | red << 16 | green << 8 | blue;}// 将数组中的象素产生一个图像return ImageIOHelper.imageProducerToBufferedImage(new MemoryImageSource(iw, ih,pixels, 0, iw));}/** 转换为黑白灰度图 */public BufferedImage grayFilter(){ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);ColorConvertOp op = new ColorConvertOp(cs, null);return op.filter(image, null);}/** 平滑缩放 */public BufferedImage scaling(double s){AffineTransform tx = new AffineTransform();tx.scale(s, s);AffineTransformOp op = new AffineTransformOp(tx,AffineTransformOp.TYPE_BILINEAR);return op.filter(image, null);}public BufferedImage scale(Float s){int srcW = image.getWidth();int srcH = image.getHeight();int newW = Math.round(srcW * s);int newH = Math.round(srcH * s);// 先做水平方向上的伸缩变换BufferedImage tmp = new BufferedImage(newW, newH, image.getType());Graphics2D g = tmp.createGraphics();for (int x = 0; x < newW; x++){g.setClip(x, 0, 1, srcH);// 按比例放缩g.drawImage(image, x - x * srcW / newW, 0, null);}// 再做垂直方向上的伸缩变换BufferedImage dst = new BufferedImage(newW, newH, image.getType());g = dst.createGraphics();for (int y = 0; y < newH; y++){g.setClip(0, y, newW, 1);// 按比例放缩g.drawImage(tmp, 0, y - y * srcH / newH, null);}return dst;}}
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