ffmepg入门学习九 java实现图片截图
1.准备
需求，形成1天每个小时的画像，并合成一个图片。
思路：每个小时抽取一张图片,再把这种图片截取1/24并存放，后面，再把这24张图片合成一张图片。
准备一张原图
截图前：
截图后:(下午14点的截图)
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package com.qihui.qxj.utils;
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import java.awt.Rectangle;
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import java.awt.image.BufferedImage;
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import java.io.*;
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import java.util.Iterator;
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import javax.imageio.ImageIO;
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import javax.imageio.ImageReadParam;
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import javax.imageio.ImageReader;
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import javax.imageio.stream.ImageInputStream;
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public
class ImageUtils {
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public static void cutJPG(InputStream input, OutputStream out, int x,
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int y,
int width,
int height)
throws IOException {
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ImageInputStream imageStream =
null;
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try {
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Iterator
readers = ImageIO.getImageReadersByFormatName(
"jpg");
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ImageReader reader = readers.next();
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imageStream = ImageIO.createImageInputStream(input);
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reader.setInput(imageStream,
true);
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ImageReadParam param = reader.getDefaultReadParam();
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System.out.println(reader.getWidth(
0));
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System.out.println(reader.getHeight(
0));
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Rectangle rect =
new Rectangle(x, y, width, height);
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param.setSourceRegion(rect);
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BufferedImage bi = reader.read(
0, param);
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ImageIO.write(bi,
"jpg", out);
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}
finally {
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imageStream.close();
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}
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}
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public static void cutPNG(InputStream input, OutputStream out, int x,
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int y,
int width,
int height)
throws IOException {
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ImageInputStream imageStream =
null;
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try {
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Iterator
readers = ImageIO.getImageReadersByFormatName(
"png");
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ImageReader reader = readers.next();
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imageStream = ImageIO.createImageInputStream(input);
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reader.setInput(imageStream,
true);
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ImageReadParam param = reader.getDefaultReadParam();
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System.out.println(reader.getWidth(
0));
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System.out.println(reader.getHeight(
0));
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Rectangle rect =
new Rectangle(x, y, width, height);
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param.setSourceRegion(rect);
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BufferedImage bi = reader.read(
0, param);
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ImageIO.write(bi,
"png", out);
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}
finally {
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imageStream.close();
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}
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}
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public static void cutImage(InputStream input, OutputStream out, String type,int x,
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int y,
int width,
int height)
throws IOException {
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ImageInputStream imageStream =
null;
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try {
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String imageType=(
null==type||
"".equals(type))?
"jpg":type;
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Iterator
readers = ImageIO.getImageReadersByFormatName(imageType);
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ImageReader reader = readers.next();
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imageStream = ImageIO.createImageInputStream(input);
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reader.setInput(imageStream,
true);
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ImageReadParam param = reader.getDefaultReadParam();
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Rectangle rect =
new Rectangle(x, y, width, height);
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param.setSourceRegion(rect);
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BufferedImage bi = reader.read(
0, param);
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ImageIO.write(bi, imageType, out);
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}
finally {
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imageStream.close();
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}
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}
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public static void main(String[] args) throws Exception {
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String imgName =
"D:\\test.jpg";
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BufferedImage sourceImg = ImageIO.read(
new FileInputStream(imgName));
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//获取原始图片的宽高
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int height = sourceImg.getHeight();
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int width = sourceImg.getWidth();
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sourceImg.flush();
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int x = (width /
24) * (
14);
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int y =
0;
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ImageUtils.cutJPG(
new FileInputStream(imgName),
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new FileOutputStream(
"D:\\test123.jpg"), x,y,width,height);
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/* ImageUtils.cutPNG(new FileInputStream("c:\\1.png"),
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new FileOutputStream("c:\\test3.png"), 0,0,50,40); */
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}
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}
本文章暂时只实现图片的截取，把一张图片切割成24份，取对应小时对应在原图的宽高。如何把24张图片合成一张图片。且看下下文。
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转载自：https://blog.csdn.net/qq_16855077/article/details/90378173