Hi Sneha,
first of all - please create test case and not code snippets ;-) . It is
quite annoying (and discouraging) for tester to create test case by himself
:-( )
Next: "Error in pixRemoveColormap: pixs must be {1,2,4,8} bpp" is a
leptonica error (e.g. I guess you would see it when you execute line "text_out
= tesseract.TessBaseAPIProcessPages(api, filename, None , 0);" or "pix_image
= leptonica.pixRead(filename)".
Because you did not provide image that failed (and full error message with
test case) I can just guess that is problem with input image format...
Zdenko
On Tue, Jan 28, 2014 at 12:55 PM, Sneha Murganoor <[email protected]>wrote:
> Hi Zendko,
>
> I am facing segmentation fault after calling the readImage method hundreds
> of times in a script.
> Please help me resolving this ..
>
> Error:
>
> Error in pixRemoveColormap: pixs must be {1,2,4,8} bpp
> Error in pixGetDepth: pix not defined
> Error in pixGetWpl: pix not defined
> Please call SetImage before attempting recognition.Segmentation fault
>
> Code Snippet:
> def
> readImage(filename,frac=0,xTopFrac=1,yTopFrac=1,xBottomFrac=1,yBottomFrac=1):
> result_text = ""
> #Initialize the Tesseract API
> api = tesseract.TessBaseAPICreate()
> rc = tesseract.TessBaseAPIInit3(api, TESSDATA_PREFIX, lang);
> if (rc):
> tesseract.TessBaseAPIDelete(api)
> logging.error("Could not initialize tesseract.\n")
> raise Exception("Could not initialize tesseract.")
>
> if(frac == 0):
> logging.debug("No Focusing required")
> #Get the ext from Image
> text_out = tesseract.TessBaseAPIProcessPages(api, filename, None ,
> 0);
> result_text = ctypes.string_at(text_out)
> else :
> logging.debug("Focus Required. Fractions passed")
> logging.debug(xTopFrac+" "+yTopFrac+" "+xBottomFrac+"
> "+yBottomFrac)
>
> #Get the Image height and Width
> pix_image = leptonica.pixRead(filename)
> x = leptonica.pixGetWidth(pix_image)
> y = leptonica.pixGetHeight(pix_image)
> logging.debug("Image width: " + str(x))
> logging.debug("Image height: " + str(y))
>
> tesseract.TessBaseAPISetImage2(api, pix_image)
> #Setting origin (xPoint,yPoint ) and width and height
> xPoint = int(float(Fraction(xTopFrac)*x))
> yPoint = int(float(Fraction(yTopFrac)*y))
> width = int(float(Fraction(xBottomFrac)*x)) - xPoint
> height = int(float(Fraction(yBottomFrac)*y)) - yPoint
> logging.debug("Origin : ")
> logging.debug(str(xPoint)+" "+str(yPoint))
> logging.debug("Width & Height :")
> logging.debug(str(width)+" "+str(height))
> #Setting the rectangle
>
> tesseract.TessBaseAPISetRectangle(api,xPoint,yPoint,width-1,height-1)
> #get the text
>
> text_out = tesseract.TessBaseAPIGetUTF8Text(api)
> result_text = ctypes.string_at(text_out)
> tesseract.TessBaseAPIDelete(api)
> logging.debug("Result Text : "+result_text)
> return result_text
>
>
> Thanks,
> Sneha
>
>
> On Fri, Dec 6, 2013 at 12:26 AM, zdenko podobny <[email protected]> wrote:
>
>> You need to use leptonica (e.g. via ctypes, but there is also python
>> module pylepthonica).
>>
>> Modify relevant part of script with something like this:
>>
>>
>> lep = ctypes.cdll.LoadLibrary("liblept.so")
>> pix_image = lep.pixRead(filename)print "image width:",
>> lep.pixGetWidth(pix_image)print "image height:", lep.pixGetHeight(pix_image)
>>
>> tesseract.TessBaseAPISetImage2(api, pix_image)
>> tesseract.TessBaseAPISetRectangle(api, 30, 60, 400, 100)
>> text_out = tesseract.TessBaseAPIGetUTF8Text(api)
>> result_text = ctypes.string_at(text_out)print result_text
>>
>>
>> Zdenko
>>
>>
>> On Thu, Dec 5, 2013 at 10:34 AM, Sneha Murganoor <[email protected]>wrote:
>>
>>> Hi Zdenko,
>>>
>>> how to get size of image and set recognition to a sub-rectangle of the
>>> image in this?
>>>
>>> Thanks,
>>> Sneha
>>>
>>>
>>> On Wed, Dec 4, 2013 at 11:18 AM, Sneha Murganoor <[email protected]>wrote:
>>>
>>>> Zdenko,
>>>>
>>>> It is just excellent. It works very well. Thank you.
>>>>
>>>> Thanks,
>>>> Sneha
>>>>
>>>>
>>>> On Wed, Nov 20, 2013 at 6:59 PM, Nick White <[email protected]>wrote:
>>>>
>>>>> Hi Zdenko,
>>>>>
>>>>> On Wed, Nov 20, 2013 at 02:19:07PM +0100, zdenko podobny wrote:
>>>>> > Anyway you can use tesseract 3.02.02 in python via ctypes - see
>>>>> example[1]
>>>>> >
>>>>> > [1]
>>>>> https://code.google.com/p/tesseract-ocr/source/browse/trunk/contrib/
>>>>> > tesseract-c_api-demo.py?r=903
>>>>>
>>>>> That's neat, I hadn't seen python's ctypes before! Any chance you
>>>>> could add that (or a link to it) to the APIExample wiki page?
>>>>>
>>>>> Nick
>>>>>
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