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Merge pull request #2 from iamlfc/master
优化图片识别逻辑
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113 changes: 113 additions & 0 deletions
113
scanner/src/main/java/com/hnsh/scanner/utils/BitmapUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package com.hnsh.scanner.utils; | ||
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| import android.graphics.Bitmap; | ||
| import android.graphics.BitmapFactory; | ||
| import android.util.Log; | ||
|
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| import com.google.zxing.BinaryBitmap; | ||
| import com.google.zxing.ChecksumException; | ||
| import com.google.zxing.DecodeHintType; | ||
| import com.google.zxing.FormatException; | ||
| import com.google.zxing.NotFoundException; | ||
| import com.google.zxing.RGBLuminanceSource; | ||
| import com.google.zxing.Result; | ||
| import com.google.zxing.common.HybridBinarizer; | ||
| import com.google.zxing.qrcode.QRCodeReader; | ||
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|
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.util.EnumMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * @author ansen | ||
| * @create time 2018/10/25 | ||
| */ | ||
| public class BitmapUtils { | ||
| /** | ||
| * 解析二维码图片 | ||
| * @param bitmapPath 文件路径 | ||
| * @return | ||
| */ | ||
| public static String parseQRcode(String bitmapPath){ | ||
| Bitmap bitmap = BitmapFactory.decodeFile(bitmapPath, null); | ||
| String result=parseQRcode(bitmap); | ||
| return result; | ||
| } | ||
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| public static String parseQRcode(Bitmap bmp){ | ||
| bmp=comp(bmp);//bitmap压缩 如果不压缩的话在低配置的手机上解码很慢 | ||
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| int width = bmp.getWidth();//图片宽度 | ||
| int height = bmp.getHeight();//图片高度 | ||
| int[] pixels = new int[width * height]; | ||
| bmp.getPixels(pixels, 0, width, 0, 0, width, height); | ||
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| QRCodeReader reader = new QRCodeReader(); | ||
| Map<DecodeHintType, Object> hints = new EnumMap<>(DecodeHintType.class); | ||
| hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);//优化精度 | ||
| hints.put(DecodeHintType.CHARACTER_SET,"utf-8");//解码设置编码方式为：utf-8 | ||
| try { | ||
| Result result = reader.decode(new BinaryBitmap(new HybridBinarizer(new RGBLuminanceSource(width, height, pixels))), hints); | ||
| return result.getText(); | ||
| } catch (NotFoundException e) { | ||
| Log.i("ansen",""+e.toString()); | ||
| e.printStackTrace(); | ||
| } catch (ChecksumException e) { | ||
| e.printStackTrace(); | ||
| } catch (FormatException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| return null; | ||
| } | ||
|
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| //图片按比例大小压缩方法（根据Bitmap图片压缩） | ||
| private static Bitmap comp(Bitmap image) { | ||
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); | ||
| image.compress(Bitmap.CompressFormat.JPEG, 100, baos); | ||
| if( baos.toByteArray().length / 1024>1024) {//判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactory.decodeStream）时溢出 | ||
| baos.reset();//重置baos即清空baos | ||
| image.compress(Bitmap.CompressFormat.JPEG, 50, baos);//这里压缩50%，把压缩后的数据存放到baos中 | ||
| } | ||
| ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray()); | ||
| BitmapFactory.Options newOpts = new BitmapFactory.Options(); | ||
| //开始读入图片，此时把options.inJustDecodeBounds 设回true了 | ||
| newOpts.inJustDecodeBounds = true; | ||
| Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts); | ||
| newOpts.inJustDecodeBounds = false; | ||
| int w = newOpts.outWidth; | ||
| int h = newOpts.outHeight; | ||
| //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为 | ||
| float hh = 400f;//这里设置高度为800f | ||
| float ww = 400f;//这里设置宽度为480f | ||
| //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可 | ||
| int be = 1;//be=1表示不缩放 | ||
| if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放 | ||
| be = (int) (newOpts.outWidth / ww); | ||
| } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放 | ||
| be = (int) (newOpts.outHeight / hh); | ||
| } | ||
| if (be <= 0) | ||
| be = 1; | ||
| newOpts.inSampleSize = be;//设置缩放比例 | ||
| //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了 | ||
| isBm = new ByteArrayInputStream(baos.toByteArray()); | ||
| bitmap = BitmapFactory.decodeStream(isBm, null, newOpts); | ||
| return compressImage(bitmap);//压缩好比例大小后再进行质量压缩 | ||
| } | ||
|
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| //质量压缩方法 | ||
| private static Bitmap compressImage(Bitmap image) { | ||
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); | ||
| image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 | ||
| int options = 100; | ||
| while (baos.toByteArray().length/1024>100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩 | ||
| baos.reset();//重置baos即清空baos | ||
| image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中 | ||
| options -= 10;//每次都减少10 | ||
| } | ||
| ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中 | ||
| Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片 | ||
| return bitmap; | ||
| } | ||
| } |
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