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There is no universal command line that would fit to all cases (sometimes you need to blur and sharpen image). But you can give a try to TEXTCLEANER from Fred's ImageMagick Scripts.
If you are not fan of command line, maybe you can try to use opensource scantailor.sourceforge.net or commercial bookrestorer.
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Thứ Năm, 31 tháng 3, 2016
http://stackoverflow.com/questions/9480013/image-processing-to-improve-tesseract-ocr-accuracy
Chủ Nhật, 27 tháng 3, 2016
how to make a range of colors in image transparent java
http://stackoverflow.com/questions/665406/how-to-make-a-color-transparent-in-a-bufferedimage-and-save-as-png
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.awt.image.ImageProducer;
import java.awt.image.RGBImageFilter;
import java.io.*;
import javax.imageio.ImageIO;
public class AddTransparency
{
AddTransparency() throws IOException
{
String imagePath = "E:/Documents/images/";
File inFile = new File(imagePath, "map.png");
BufferedImage image = ImageIO.read(inFile);
Image transpImg1 = TransformGrayToTransparency(image);
BufferedImage resultImage1 = ImageToBufferedImage(transpImg1, image.getWidth(), image.getHeight());
File outFile1 = new File(imagePath, "map_with_transparency1.png");
ImageIO.write(resultImage1, "PNG", outFile1);
Image transpImg2 = TransformColorToTransparency(image, new Color(0, 50, 77), new Color(200, 200, 255));
BufferedImage resultImage2 = ImageToBufferedImage(transpImg2, image.getWidth(), image.getHeight());
File outFile2 = new File(imagePath, "map_with_transparency2.png");
ImageIO.write(resultImage2, "PNG", outFile2);
}
private Image TransformGrayToTransparency(BufferedImage image)
{
ImageFilter filter = new RGBImageFilter()
{
public final int filterRGB(int x, int y, int rgb)
{
return (rgb << 8) & 0xFF000000;
}
};
ImageProducer ip = new FilteredImageSource(image.getSource(), filter);
return Toolkit.getDefaultToolkit().createImage(ip);
}
private Image TransformColorToTransparency(BufferedImage image, Color c1, Color c2)
{
// Primitive test, just an example
final int r1 = c1.getRed();
final int g1 = c1.getGreen();
final int b1 = c1.getBlue();
final int r2 = c2.getRed();
final int g2 = c2.getGreen();
final int b2 = c2.getBlue();
ImageFilter filter = new RGBImageFilter()
{
public final int filterRGB(int x, int y, int rgb)
{
int r = (rgb & 0xFF0000) >> 16;
int g = (rgb & 0xFF00) >> 8;
int b = rgb & 0xFF;
if (r >= r1 && r <= r2 &&
g >= g1 && g <= g2 &&
b >= b1 && b <= b2)
{
// Set fully transparent but keep color
return rgb & 0xFFFFFF;
}
return rgb;
}
};
ImageProducer ip = new FilteredImageSource(image.getSource(), filter);
return Toolkit.getDefaultToolkit().createImage(ip);
}
private BufferedImage ImageToBufferedImage(Image image, int width, int height)
{
BufferedImage dest = new BufferedImage(
width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = dest.createGraphics();
g2.drawImage(image, 0, 0, null);
g2.dispose();
return dest;
}
public static void main(String[] args) throws IOException
{
AddTransparency at = new AddTransparency();
}
}Thứ Bảy, 26 tháng 3, 2016
select image to insert tinymce
tinyMCE.init({
// General options
mode: "textareas",
theme: "advanced",
plugins: "autolink,lists,pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template,wordcount,advlist,autosave,visualblocks",
// Theme options
theme_advanced_buttons1: "|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,styleselect,formatselect,fontselect,fontsizeselect",
theme_advanced_buttons2: "cut,copy,paste,pastetext,pasteword,|,search,replace,|,bullist,numlist,|,outdent,indent,blockquote,|,undo,redo,|,link,unlink,anchor,image,cleanup,help,code,|,insertdate,inserttime,preview,|,forecolor,backcolor",
theme_advanced_buttons3: "tablecontrols,|,hr,removeformat,visualaid,|,sub,sup,|,charmap,emotions,iespell,media,advhr,|,print,|,ltr,rtl,|,fullscreen",
theme_advanced_buttons4: "insertlayer,moveforward,movebackward,absolute,|,styleprops,|,cite,abbr,acronym,del,ins,attribs,|,visualchars,nonbreaking,template,pagebreak,restoredraft,visualblocks",
theme_advanced_toolbar_location: "top",
theme_advanced_toolbar_align: "left",
theme_advanced_statusbar_location: "bottom",
theme_advanced_resizing: true,
// Example content CSS (should be your site CSS)
content_css: "css/content.css",
// Drop lists for link/image/media/template dialogs
template_external_list_url: "lists/template_list.js",
external_link_list_url: "lists/link_list.js",
external_image_list_url: "/ajax/am/get-list-image.js",
media_external_list_url: "lists/media_list.js",
// Style formats
style_formats: [
{title: 'Bold text', inline: 'b'},
{title: 'Red text', inline: 'span', styles: {color: '#ff0000'}},
{title: 'Red header', block: 'h1', styles: {color: '#ff0000'}},
{title: 'Example 1', inline: 'span', classes: 'example1'},
{title: 'Example 2', inline: 'span', classes: 'example2'},
{title: 'Table styles'},
{title: 'Table row 1', selector: 'tr', classes: 'tablerow1'}
],
// document_base_url: "/static/image/product/",
convert_urls: false,
height: 450,
width: 730
});
/ajax/am/get-list-image.js
var tinyMCEImageList = new Array( ["/static/image/product/338.jpg", "/static/image/product/338.jpg"], ["/static/image/product/339.jpg", "/static/image/product/339.jpg"], ["/static/image/product/thumb_645.jpg", "/static/image/product/thumb_645.jpg"], ["thumb_646.jpg", "/static/image/product/thumb/thumb_646.jpg"]);
get-list-image.php ( PHP script text )
<?php // You can't simply echo everything right away because we need to set some headers first! $output = ''; // Here we buffer the JavaScript code we want to send to the browser. $delimiter = "\n"; // for eye candy... code gets new lines $output .= 'var tinyMCEImageList = new Array('; $directory = APPLICATION_PATH . "/static/image/product"; // Use your correct (relative!) path here function dirToArray($dir) { $result = array(); $cdir = scandir($dir); foreach ($cdir as $key => $value) { if (!in_array($value, array(".", ".."))) { if (is_dir($dir . DIRECTORY_SEPARATOR . $value)) { $result[$value] = dirToArray($dir . DIRECTORY_SEPARATOR . $value); } else { $result[] = $value; } } } return $result; } $list_image = (dirToArray($directory)); //foreach ($list_image as $image) { //// echo $image."<br/>"; // $output .= $delimiter // . '["' // . $image // . '", "' // . '\static\image\product\\thumb' . $image // . '"],'; //} $total = count($list_image); for ($i = 0; $i < $total - 1; $i++) { $output .= $delimiter . '["' . '/static/image/product/'. $list_image[$i] . '", "' . '/static/image/product/'. $list_image[$i] . '"],'; } $output .= $delimiter . '["' . $list_image[$total - 1] . '", "' . '/static/image/product/thumb/' . $list_image[$total - 1] . '"]'; // Finish code: end of array definition. Now we have the JavaScript code ready! $output .= ');'; // Make output a real JavaScript file! header('Content-type: text/javascript'); // browser will now recognize the file as a valid JS file // prevent browser from caching header('pragma: no-cache'); header('expires: 0'); // i.e. contents have already expired // Now we can send data to the browser because all headers have been set! echo $output;
Thứ Tư, 23 tháng 3, 2016
Latency Numbers Every Programmer Should Know
https://gist.github.com/jboner/2841832#file-latency-txt
Latency Comparison Numbers -------------------------- L1 cache reference 0.5 ns Branch mispredict 5 ns L2 cache reference 7 ns 14x L1 cache Mutex lock/unlock 25 ns Main memory reference 100 ns 20x L2 cache, 200x L1 cache Compress 1K bytes with Zippy 3,000 ns 3 us Send 1K bytes over 1 Gbps network 10,000 ns 10 us Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD Read 1 MB sequentially from memory 250,000 ns 250 us Round trip within same datacenter 500,000 ns 500 us Read 1 MB sequentially from SSD* 1,000,000 ns 1,000 us 1 ms ~1GB/sec SSD, 4X memory Disk seek 10,000,000 ns 10,000 us 10 ms 20x datacenter roundtrip Read 1 MB sequentially from disk 20,000,000 ns 20,000 us 20 ms 80x memory, 20X SSD Send packet CA->Netherlands->CA 150,000,000 ns 150,000 us 150 ms
Thứ Sáu, 4 tháng 3, 2016
Java code for WGS84 to Google map position and back
java
) {
if (Math.abs(mercatorX_lon) < 180 && Math.abs(mercatorY_lat) < 90) {
return;
}
if ((Math.abs(mercatorX_lon) > 20037508.3427892) || (Math.abs(mercatorY_lat) > 20037508.3427892)) {
return;
}
double x = mercatorX_lon;
double y = mercatorY_lat;
double num3 = x / 6378137.0;
double num4 = num3 * 57.295779513082323;
double num5 = Math.floor((double) ((num4 + 180.0) / 360.0));
double num6 = num4 - (num5 * 360.0);
double num7 = 1.5707963267948966 - (2.0 * Math.atan(Math.exp((-1.0 * y) / 6378137.0)));
mercatorX_lon = num6;
mercatorY_lat = num7 * 57.295779513082323;
System.out.println("mercatorY_lat=" + mercatorY_lat);
System.out.println("mercatorX_lon=" + mercatorX_lon);
}
I ported this to PHP - here's the code, if anyone would need it:
To mercator:
$lon = ($lon * 20037508.34) / 180;
$lat = log(tan((90 + $lat) * M_PI / 360)) / (M_PI / 180);
$lat = $lat * 20037508.34 / 180;
From mercator:
$lon = ($lon / 20037508.34) * 180;
$lat = ($lat / 20037508.34) * 180;
$lat = 180/M_PI * (2 * atan(exp($lat * M_PI / 180)) - M_PI / 2);
Here are the functions in JavaSCript ... As extracted from OpenLayers
function toMercator (lon, lat) {
var x = lon * 20037508.34 / 180;
var y = Math.log(Math.tan((90 + lat) * Math.PI / 360)) / (Math.PI / 180);
y = y * 20037508.34 / 180;
return [x, y];
}
function inverseMercator (x, y) {
var lon = (x / 20037508.34) * 180;
var lat = (y / 20037508.34) * 180;
lat = 180/Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180)) - Math.PI / 2);
return [lon, lat];
}
Fairly straightforward to convert to Java
http://stackoverflow.com/questions/7661/java-code-for-wgs84-to-google-map-position-and-back
private void FromWebMercatorToGeographic(ref double mercatorX_lon, ref double mercatorY_lat)
{
if (Math.Abs(mercatorX_lon) < 180 && Math.Abs(mercatorY_lat) < 90)
return;
if ((Math.Abs(mercatorX_lon) > 20037508.3427892) || (Math.Abs(mercatorY_lat) > 20037508.3427892))
return;
double x = mercatorX_lon;
double y = mercatorY_lat;
double num3 = x / 6378137.0;
double num4 = num3 * 57.295779513082323;
double num5 = Math.Floor((double)((num4 + 180.0) / 360.0));
double num6 = num4 - (num5 * 360.0);
double num7 = 1.5707963267948966 - (2.0 * Math.Atan(Math.Exp((-1.0 * y) / 6378137.0)));
mercatorX_lon = num6;
mercatorY_lat = num7 * 57.295779513082323;
}
http://stackoverflow.com/questions/11957538/converting-geographic-wgs-84-to-web-mercator-102100
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