[sane-devel] Canon LiDE 90

[Guillaume Gastebois]

Hello,

You can find the result of this test here :

http://ggastebois.free.fr/lide90_snoop/no_shading_2bright_2dark.tar

The calibration is about 25s long.
Resulting image is bad (as befor).

Regards
Guillaume


Pierre Willenbrock a écrit :
> Pierre Willenbrock schrieb:
>> Guillaume Gastebois schrieb:
>>> Hello,
>>>
>>> You can find all of that on : 
>>> http://ggastebois.free.fr/lide90_snoop/no_shading.tar
>>>
>>> What seems strange in calibration ?
>>>
>> The minimum/maximum values retrieved from the scans do not scale with
>> the offset values, but in a rather random manner. The calibration
>> expects a linear relationship.
>>
>> Regards,
>>   Pierre
>>
> 
> Hi,
> 
> the raw offset calibration data looks horrible. Too bright and noisy.
> Please change the too bright/too dark thresholds for
> gl841_offset_calibration in genesys_gl841.c like this:
> 
> @@ -4545,9 +4546,9 @@
>                   val =
>                       first_line[i * 2 * channels + 2 * j + 1] * 256 +
>                       first_line[i * 2 * channels + 2 * j];
> -             if (val < 10)
> +             if (val < 1000)
>                   cmin[j]++;
> -             if (val > 65525)
> +             if (val > 40000)
>                   cmax[j]++;
>           }
> 
> Send/Put online the debug files offset*.pnm, and the
> "gl841_offset_calibration: acceptable offsets: " lines from the debug
> output(Or the whole set, whichever is more convenient ;-)).
> 
> Regards,
>   Pierre
> 
>