1.16 / 2015-08-20
(4.0/5) (389)

Description

This app utilizes the camera to recognize Chess Diagrams in books using optical character recognition (OCR). It saves each recognized diagram in a pgn file, and also puts the most recent one in the clipboard as a FEN string. You can then invoke a chess program like DroidFish, or SCIDOnthego directly to analyze the position or do a data base search for games that contain this position. For best results the diagram should take up at least half the camera view, and the book be reasonably flat (there is some compensation for page warp). It works best for cameras that have autofocus capabilities, and will not work as well on cameras that can not autofocus. Also, some cameras are not very sensitive to light and require bright background lighting, while others work well even in low lighting conditions.

If the chess diagrams are not being recognized, then try setting the video resolution higher than the default (say to 1280 x 720) and/or setting the ISO to a high value instead of leaving it on auto. Also remember to keep the page as flat as possible in reasonably bright light. A green box will appear around the diagram after one successful recognition. By default two identical recognition of the same diagram in a sequence are necessary (this can be changed in settings) for a final successful result. If you are only recognizing diagrams from modern books then you can usually set the double recognition flag to false.

Before you try this app on your chess books you should take any pdf file from http://www.qualitychess.co.uk/pdf.htm and print out a single page, and then try recognition of the diagram with ChessOcr. Recognition of the diagrams in these pdf files also works when they are displayed on a computer screen, but is not as reliable. If your device does not have autofocus then the app will likely not work well enough to satisfy you, but on devices with autofocus it works well on modern books. However, recognition is not as reliable for books with older fonts, or poorly printed diagrams.

NOTE: If the app has recently stopped recognizing diagrams uncheck continuous autofocus in the settings.

We now allow screen rotation, and can recognize in both landscape and portrait mode. Please look at the video https://youtu.be/X9Sg7Z2zqK4 to see the changes in Version 1.15 and upwards. If you don't want screen rotation then disable auto-rotation on your device, or revert to version 1.13 as described below:

a) Uninstall ChessOcr from your device.
b) In your device settings, security option check the box “Unknown sources” to allow app installation from places other than Google play.
c) Now you can install ChessOcr Version 1.13 by selecting the file http://www.kgrothapps.com/files/ChessOcr-1.13.apk in a browser.
d) Once installed go to Google Play, and search for ChessOcr and then once found touch the “:” button in the top right part of the screen, and disable autoupdate.

You can also use a free database that I maintain to look up the games associated with a given recognized position as follows:

1) Install ChessOcr app and SCIDOntheGo https://play.google.com/store/apps/details?id=org.scid.android
2) Download zip file http://www.kgrothapps.com/files/dbmsall-aug-9-14.zip then unzip and put these files in SCID directory.
3) Start SCIDOntheGo app and do file open database dbmsall-aug-9-14.zip, and keep this database open.
4) Long press on the board, go to bottom of menu, and select "Retrieve position".
5) First time set selection of ChessOcr to be the permanent association.
6) Place diagram in middle of video, large as possible and press screen to start.
7) Recognized position is drawn on screen, press which colour is to move.
8) Resulting position is returned to SCIDOntheGO
9) Do "Search, Search current board, Ok" and then pgn for matching games will be retrieved.

You can use "Retrieve position" from the chess app DroidFish by doing long press on the board, going to the bottom of the menu, and then selecting "Retrieve Position".

App Information ChessOcr OCR Chess Diagrams

  • App Name
    ChessOcr OCR Chess Diagrams
  • Package Name
    com.kgroth.chessocr
  • Updated
    2015-08-20
  • File Size
    4.8M
  • Requires Android
    Android 3.0+
  • Version
    1.16
  • Developer
    gerhard+roth
  • Installs
    10,000 - 50,000
  • Price
    Free
  • Category
    Strategy
  • Developer
  • Google Play Link

ChessOcr OCR Chess Diagrams Version History

Select ChessOcr OCR Chess Diagrams Version :
  • 1.16 (17)
  • ChessOcr OCR Chess Diagrams 1.16 (17) APK File

    Publish Date: 2015-08-20
    Requires Android: Android 3.0 and up
    File Size: 5 MB (APK file)
    File APK Md5: decbb31f09c65c2fd39a4eb4be1cc256
    File APK Sha1: 4e3027380eef8e74a202736d8c22e00c0ed05ba5
    APK Signature: 557f711da0926e790c764899efd0a68679e45b07
    What's new :
    Release 1.16 fixes some autofocus problems that caused traps on some devices. If this version does not recognize diagrams then in settings uncheck the continuous video autofocus flag. Release 1.15 allows recognition in both portrait and landscape mode, and deals correctly with orientation changes. If you don't want automatic screen rotation just disable it on the device, or follow the instructions above to reinstall ChessOcr 1.13 (which does not autorotate) and disable updating of the app.

Gerhard Roth Show More...

ChessOcrPict APK

1.4(5)

Gerhard Roth
This app recognize chess figures (diagrams) in a book or magazine. It is a free version of...
ChessOcr OCR Chess Diagrams APK

1.16(17)

Gerhard Roth
This app utilizes the camera to recognize Chess Diagrams in books using optical character...

Top Games Show More...

Subway Surfers APK

1.62.1(102)

Kiloo
DASH as fast as you can! DODGE the oncoming trains! Help Jake, Tricky & Fresh escape from...
Candy Crush Saga APK

1.85.0.5(1085005)

King
Candy Crush Saga, from the makers of Candy Crush Soda Saga & Farm Heroes Saga! Join Tiffi...
DEER HUNTER 2014 APK

2.12.1(21210)

Glu
Return to the wilderness in the most visually stunning FPS hunting simulator on Android! Travel...
Burger APK

1.0.13(15)

Magma Mobile
A burger-serving game is coming now for your best enjoyment in a free version with the Magma...
GUNSHIP BATTLE : Helicopter 3D APK

2.4.40(2005021440)

JOYCITY Corp.
The world's most powerful combat helicopters are at your fingertips. ★★★ 30 million...
Candy Crush Jelly Saga APK

1.28.3(10280030)

King
There's a new player in town, the wiggling, jiggling Jelly Queen and she's here to...
Word search APK

2.2b(61)

AppDrac
FREE WORD SEARCH PUZZLE IN ENGLISH: Welcome to the best auto-generated word search application...
Cut the Rope 2 APK

1.6.5(1496255)

ZeptoLab
SWEET! Om Nom's shenanigans continue in Cut the Rope 2! With new characters, fresh gameplay...