[
https://issues.apache.org/jira/browse/PDFBOX-3464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Roman updated PDFBOX-3464:
--------------------------
Description:
The issue basically same as PDFBOX-2749, but wrong sample was attached to it by
mistake. Correct PDF is attached here.
The core of the problem is that font height for this specific font is
determined incorrectly, please see code with comments below.
The issue was reproduced on Pdfbox 1.8.4, but as we tested before, same result
we get on 1.8.9 and 2.0 versions.
{code}
public class Extractor extends PDFTextStripper {
//<...CUT...>
protected void writePage() throws IOException {
for (List<TextPosition> textList : charactersByArticle) {
//charactersByArticle was inherited from base class
Iterator textIter = textList.iterator();
//<...CUT...>
while (textIter.hasNext()) {
TextPosition position = (TextPosition)
textIter.next();
//<...CUT...>
PDFontDescriptor fontDescriptor =
position.getFont().getFontDescriptor();
//<...CUT...>
float yscale = position.getTextPos().getYScale();
float asc = Math.abs(fontDescriptor.getAscent() / 1000 *
yscale);
float rh =
Math.abs(fontDescriptor.getFontBoundingBox().getUpperRightY() / 1000 * yscale);
float desc = Math.abs(fontDescriptor.getDescent() / 1000 *
yscale);
float capHeight = Math.abs(fontDescriptor.getCapHeight() / 1000
* yscale);
if (capHeight == 0)
capHeight = position.getHeight();
float h = (rh + Math.max(Math.max(capHeight,
position.getHeight()), asc)) / 2;
//"h" evaluates to 37.39 (should be between 11 and 12)
//"desc" evaluates to 2.664
//"capHeight" evaluates to 37.39
//"position.getHeight()" evaluates to 33.48
{code}
was:
The issue basically same as PDFBOX-2749, but wrong sample was attached to it by
mistake. Correct PDF is attached here.
The core of the problem is that font height for this specific font is
determined incorrectly, please see code with comments below.
{code}
public class Extractor extends PDFTextStripper {
//<...CUT...>
protected void writePage() throws IOException {
for (List<TextPosition> textList : charactersByArticle) {
//charactersByArticle was inherited from base class
Iterator textIter = textList.iterator();
//<...CUT...>
while (textIter.hasNext()) {
TextPosition position = (TextPosition)
textIter.next();
//<...CUT...>
PDFontDescriptor fontDescriptor =
position.getFont().getFontDescriptor();
//<...CUT...>
float yscale = position.getTextPos().getYScale();
float asc = Math.abs(fontDescriptor.getAscent() / 1000 *
yscale);
float rh =
Math.abs(fontDescriptor.getFontBoundingBox().getUpperRightY() / 1000 * yscale);
float desc = Math.abs(fontDescriptor.getDescent() / 1000 *
yscale);
float capHeight = Math.abs(fontDescriptor.getCapHeight() / 1000
* yscale);
if (capHeight == 0)
capHeight = position.getHeight();
float h = (rh + Math.max(Math.max(capHeight,
position.getHeight()), asc)) / 2;
//"h" evaluates to 37.39 (should be between 11 and 12)
//"desc" evaluates to 2.664
//"capHeight" evaluates to 37.39
//"position.getHeight()" evaluates to 33.48
{code}
> character height 3 times higher than expected
> ---------------------------------------------
>
> Key: PDFBOX-3464
> URL: https://issues.apache.org/jira/browse/PDFBOX-3464
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Reporter: Roman
> Priority: Critical
> Attachments: screenshot-1.png, subnode.docx.pdf
>
>
> The issue basically same as PDFBOX-2749, but wrong sample was attached to it
> by mistake. Correct PDF is attached here.
> The core of the problem is that font height for this specific font is
> determined incorrectly, please see code with comments below.
> The issue was reproduced on Pdfbox 1.8.4, but as we tested before, same
> result we get on 1.8.9 and 2.0 versions.
> {code}
> public class Extractor extends PDFTextStripper {
> //<...CUT...>
> protected void writePage() throws IOException {
> for (List<TextPosition> textList : charactersByArticle) {
> //charactersByArticle was inherited from base class
> Iterator textIter = textList.iterator();
> //<...CUT...>
> while (textIter.hasNext()) {
> TextPosition position = (TextPosition)
> textIter.next();
> //<...CUT...>
> PDFontDescriptor fontDescriptor =
> position.getFont().getFontDescriptor();
> //<...CUT...>
> float yscale = position.getTextPos().getYScale();
> float asc = Math.abs(fontDescriptor.getAscent() / 1000 *
> yscale);
> float rh =
> Math.abs(fontDescriptor.getFontBoundingBox().getUpperRightY() / 1000 *
> yscale);
> float desc = Math.abs(fontDescriptor.getDescent() / 1000 *
> yscale);
> float capHeight = Math.abs(fontDescriptor.getCapHeight() / 1000
> * yscale);
> if (capHeight == 0)
> capHeight = position.getHeight();
> float h = (rh + Math.max(Math.max(capHeight,
> position.getHeight()), asc)) / 2;
> //"h" evaluates to 37.39 (should be between 11 and 12)
> //"desc" evaluates to 2.664
> //"capHeight" evaluates to 37.39
> //"position.getHeight()" evaluates to 33.48
> {code}
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