Develop Reference

How to crop the image within a print screen?

I am developing an application that chooses an image of a wound and displays it on the application screen. with this, the user marks the region of interest of the wound, so that later the algorithm can recognize and process the region of interest. I'm doing this using the lib implementation 'com.github.gcacace: signature-pad: 1.2.1' to demarcate the region and then I'm saving the screen's "printscreen" so I can save the markup along with the image of the wound.
How I wish the image will look
Exit:
However, I want to cut the printscreen according to the image of the wound to send to the server to process the image. Can someone help me cut out the wound image after marking.
private fun saveImage(myBitmap: Bitmap?): String? {
try {
// image naming and path to include sd card appending name you choose for file
val mPath = Environment.getExternalStorageDirectory().toString() + "/imagesignature.jpg"
// create bitmap screen capture
val v1 = window.decorView.rootView
v1.isDrawingCacheEnabled = true
val bitmap = Bitmap.createBitmap(v1.drawingCache)
v1.isDrawingCacheEnabled = false
val imageFile = File(mPath)
val outputStream = FileOutputStream(imageFile)
val quality = 100
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream)
outputStream.flush()
outputStream.close()
//setting screenshot in imageview
val filePath = imageFile.path
val ssbitmap = BitmapFactory.decodeFile(imageFile.absolutePath)
imagem.setImageBitmap(ssbitmap)
} catch (e: Throwable) {
// Several error may come out with file handling or DOM
e.printStackTrace()
}
return ""
}

I am still a learner so for an easy way to crop an image I would suggest using this library:
https://github.com/ArthurHub/Android-Image-Cropper
This is where you can crop the image as per your requirement and store the image on the server

If you have the coordinates of the rectangle you want to save:
Bitmap croppedBmp = Bitmap.createBitmap(originalBmp, rectanglePositionX, rectanglePositionY, rectangleWidth, rectangleHeight);
Or you can try:
BitmapFactory.decodeStream(InputStream is, Rect outPadding, Options opts)
or
BitmapFactory.decodeFileDescriptor(FileDescriptor fd, Rect outPadding, Options opts)
where in the Rect outPadding you will set the coordinates of the rectangle you want to save.

As far as I know, I don't think it's possible to crop and image. In order to crop, you need to find the dimensions for the part that you want. I don't think you can tell the program the dimensions of what you want and then crop everything else off, as far as my knowledge goes. It might be possible to print an image, but I don't think Java can crop. Other coding programs might work better for this.

How to convert an image (rgb/gray) inside a pdf to monochrom/bitonal one using itext and java

I'm writing a java programm to swap images inside a pdf. Due to the process of generation they are stored as high dpi, rgb images, but are bitonal/monochrome images. I'm using itext 7.1.1, but also testet the latest dev version (7.1.2 snapshot).
I'm already able to extract the images from pdf and convert them to png or tif using indexed colours or gray (0 & 255 only) in imagemagick (also testet gimp).
I modified some code from itext, to replace the images inside the pdf, which does work for DeviceRGB- and DeviceGray-Images, but not for Bitonal ones:
public static Image readPng(String pImageFolder, int pImageNumber) throws IOException {
String url = "./" + pImageFolder + "/" + pImageNumber + ".png";
File ifile = new File(url);
if (ifile.exists() && ifile.isFile()) {
return new Image(ImageDataFactory.create(url));
} else {
return null;
}
}
public static void replaceStream(PdfStream orig, PdfStream stream) throws IOException {
orig.clear();
orig.setData(stream.getBytes());
for (PdfName name : stream.keySet()) {
orig.put(name, stream.get(name));
}
}
public static void replaceImages(String pFilename, String pImagefolder, String pOutputFilename) throws IOException {
PdfDocument pdfDoc = new PdfDocument(new PdfReader(pFilename), new PdfWriter(pOutputFilename));
for (int i = 0; i < pdfDoc.getNumberOfPages(); i++) {
PdfDictionary page = pdfDoc.getPage(i + 1).getPdfObject();
PdfDictionary resources = page.getAsDictionary(PdfName.Resources);
PdfDictionary xobjects = resources.getAsDictionary(PdfName.XObject);
Iterator<PdfName> iter = xobjects.keySet().iterator();
PdfName imgRef;
PdfStream stream;
Image img;
int number;
while (iter.hasNext()) {
imgRef = iter.next();
number = xobjects.get(imgRef).getIndirectReference().getObjNumber();
stream = xobjects.getAsStream(imgRef);
img = readPng(pImagefolder, number);
if (img != null) {
replaceStream(stream, img.getXObject().getPdfObject());
}
}
}
pdfDoc.close();
}
If i convert the images to tif and use them as replacement, there are dark images (all pixels are black) inside the pdf. If i try to use png-images, they are not shown and pdfimages complaints "Unknown compression method in flate stream".

FYI:
There was an error in my replaceStream: getBytes() deflates a PdfStream. All Stream-Attributes were copied, thus there was a Filter-Information saying FlateDecoding is necessary.
I had to tell getBytes()not to deflate by setting the decoded-Parameter to false: getBytes(false)
public static void replaceStream(PdfStream orig, PdfStream stream) throws IOException {
orig.clear();
orig.setData(stream.getBytes(false));
for (PdfName name : stream.keySet()) {
orig.put(name, stream.get(name));
}
}
Now everything works fine, except:
Bitone-images are not CCITT4, which they should be. (Doesn't matter, because they are converted to JBig2.)
Images are said to have an error by Acrobat, but every other viewer displays just fine: There seems to be an error inside the ColorSpace information. That should be DeviceGray, but is CalGray with some Gamma-Information, but missing WhitePoint. Changing to DeviceGray by hand makes it work. A workaround is to strip gAMA and cHRM.
Both are conversion errors in iText7:
CCITT4: PNGImageHelper line 254 should be RawImageHelper.updateRawImageParameters(png.image, png.width, png.height, components, bpc, png.idat.toByteArray(), null); to trigger conversion.
WhitePoint is correctly read from the file and stored inside the ImageData-Class, but is discarded inside PdfImageXObject -> createPdfStream.

Error: org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectForm cannot be cast to org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage

I am trying to extract image from the pdf using pdfbox. I have taken help from this post . It worked for some of the pdfs but for others/most it did not. For example, I am not able to extract the figures in this file
After doing some research I found that PDResources.getImages is deprecated. So, I am using PDResources.getXObjects(). With this, I am not able to extract any image from the PDF and instead get this message at the console:
org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectForm cannot be cast to org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage
Now I am stuck and unable to find the solution. Please assist if anyone can.
//////UPDATE AS REPLY ON COMMENTS///
I am using pdfbox-1.8.10
Here is the code:
public void getimg ()throws Exception {
try {
String sourceDir = "C:/Users/admin/Desktop/pdfbox/mypdfbox/pdfbox/inputs/Yavaa.pdf";
String destinationDir = "C:/Users/admin/Desktop/pdfbox/mypdfbox/pdfbox/outputs/";
File oldFile = new File(sourceDir);
if (oldFile.exists()){
PDDocument document = PDDocument.load(sourceDir);
List<PDPage> list = document.getDocumentCatalog().getAllPages();
String fileName = oldFile.getName().replace(".pdf", "_cover");
int totalImages = 1;
for (PDPage page : list) {
PDResources pdResources = page.getResources();
Map pageImages = pdResources.getXObjects();
if (pageImages != null){
Iterator imageIter = pageImages.keySet().iterator();
while (imageIter.hasNext()){
String key = (String) imageIter.next();
Object obj = pageImages.get(key);
if(obj instanceof PDXObjectImage) {
PDXObjectImage pdxObjectImage = (PDXObjectImage) obj;
pdxObjectImage.write2file(destinationDir + fileName+ "_" + totalImages);
totalImages++;
}
}
}
}
} else {
System.err.println("File not exist");
}
}
catch (Exception e){
System.err.println(e.getMessage());
}
}
//// PARTIAL SOLUTION/////
I have solved the problem of the error message. I have updated the correct code in the post as well. However, the problem remains the same. I am still not able to extract the images from few of the files. Like the one, I have mentioned in this post. Any solution in that regards.

The first problem with the original code is that XObjects can be PDXObjectImage or PDXObjectForm, so it is needed to check the instance. The second problem is that the code doesn't walk PDXObjectForm recursively, forms can have resources too. The third problem (only in 1.8) is that you used getResources() instead of findResources(), getResources() doesn't check higher levels.
Code for 1.8 can be found here:
https://svn.apache.org/viewvc/pdfbox/branches/1.8/pdfbox/src/main/java/org/apache/pdfbox/ExtractImages.java?view=markup
Code for 2.0 can be found here:
https://svn.apache.org/viewvc/pdfbox/trunk/tools/src/main/java/org/apache/pdfbox/tools/ExtractImages.java?view=markup&sortby=date
(Even these are not always perfect, see this answer)
The fourth problem is that your file doesn't have any XObjects at all. All "graphics" were really vector drawings, these can't be "extracted" like embedded images. All you could do is to convert the PDF pages to images, and then mark and cut what you need.

Replace a placeholder with image in word?

I need to replace the placeholder with image in the word document using Apache POI. I am able to insert the picture in the word document using Apache poi. But i don't know how to replace the placeholder with image. Can anyone please help in this?
I know it will be easy if we do it through docx4j or some other API, i am allowed to use only the Apache poi.

It can be done but I believe you must insert raw XML to accomplish it currently. This linked question "Insert picture in word document" has the basic idea. You can do it using only the libraries that POI requires, not dom4j. If you look at the source for the method on the XWPFRun that adds a picture it too is trying to add raw XML. But if you use that method it renders your doc unreadable when written back to disk. So you have to add the picture to the document using the XWPFDocument level method, which returns a generated ID for the picture. And then add raw XML to the run with that ID in it, as the example link does.
The way we solved the problem was to instead have our users insert a placeholder image into their Word doc file instead of text. We then: add the replacement image to be inserted at the document level, find the run that contains the placeholder image using the size of the image as criteria, then get and replace the XML for that run with the new image's ID swapped in. As long as the placeholder and the replacement image are the same size this works. If you need to adjust the size of the image after replacing, you could manipulate the XML size values in the same manner. I like our solution better because it is less susceptible to changes in the Word doc XML format then inserting your own full XML for the picture. Cheers
InputStream newImageIS = getImageForCorporation(corporationID);
String relationID = run.getParagraph().getDocument().addPictureData(newImageIS, Document.PICTURE_TYPE_GIF);
replaceRunImageData(run, relationID);
private void replaceRunImageData(XWPFRun run, String relationID) {
CTGraphicalObjectData graph = run.getCTR().getDrawingArray(0).getInlineArray(0).getGraphic()
.getGraphicData();
String currentGraphicXML = graph.toString();
String originalID = RegularExpressionUtil.capture("<a:blip r:embed=\"(\\w+)\"", currentGraphicXML);
String newXML = StringUtils.replace(currentGraphicXML, originalID, relationID);
try {
graph.set(XmlToken.Factory.parse(newXML));
} catch (XmlException e) {
throw new RuntimeException(e);
}
replaced = true;
}
We identified the run of the image to replace by search each run's list of embedded pictures which met the below criteria. We tried using the name of the image as the criteria, but we found that if the placeholder image was copied from one Word doc to another Word doc on a different PC, the name was lost.
private boolean isRunForExistingImage(XWPFPicture pic) {
if (pic == null || pic.getCTPicture() == null || pic.getCTPicture().getSpPr() == null
|| pic.getCTPicture().getSpPr().getXfrm() == null
|| pic.getCTPicture().getSpPr().getXfrm().getExt() == null) {
return false;
}
long x = pic.getCTPicture().getSpPr().getXfrm().getExt().getCx();
long y = pic.getCTPicture().getSpPr().getXfrm().getExt().getCy();
return x == 2066925 && y == 590550;
}

"mimetype: application" display on a picture instead of "mimetype: image" after a ImageIO.write

When I simply create a new image from another like this:
public static void scaleByTwoRight(String src, String dest)
throws IOException {
BufferedImage bsrc = ImageIO.read(new File(src));
int width = bsrc.getWidth()/2;
int height = bsrc.getHeight();
BufferedImage bdest = bsrc.getSubimage(width, 0, width, height);
ImageIO.write(bdest,"PNG",new File(dest));
}
Source file (src) = C:...\Manga\Shonan Juna_ Gumi Tome 11\Shonan Junaï Gumi Tome 11 - 091B.png
Destination file (dest) = C:...\Manga\Shonan Junaï Gumi Tome 11 - 091B_A.png
Example of generated file: https://docs.google.com/file/d/0B1vKCZzB5hxqYzNsUWF5RHA2Wm8/edit?usp=sharing
Problem: The new image has mimetype: application instead of mimetype: image
How I arrive to this conclusion: I'm using a function to test if the file is an image or not:
public static boolean isImage(String src)
throws IOException {
File f = new File(src);
String mimetype= new MimetypesFileTypeMap().getContentType(f);
String type = mimetype.split("/")[0];
if(type.equals("image")){
return true;
}else{
System.out.println("mimetype: "+type);
return false;
}
}
It has not a huge impact if the Mime-type is not correct but I prefer to have that working properly..
Thanks for your help!
Note:
I'm running under Windows 7 / 32b
JVM 1.7 / Eclipse Helios

Your code is working fine in my machine.
I have windows XP,32 bit,
Tried with jpeg image and it is returning the mimetype as image/jpeg only.
Hope you are not trying to execute both the functions simultaneously.
Also the destination file name should contain proper extension like .jpeg or. png etc...