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删除灰色背景我写了一个小的Java理智客户端的Windows使用jfreesane库和它的工作好了一段时间,但是昨天我发现扫描仪佳能CanoScan立德问题60 - 当使用“灰度“模式扫描图像灰色背景,我不知道如何摆脱它。这里就是我说的:如何从扫描图像
我就遇到了这个问题,其他一些扫描仪和通过调整对比参数解决了这个问题,但是佳能CanoScan立德60没有之一。下面是从“scanimage -A”选项输出(我试过所有涉及到的颜色除了伽马表)的完整列表:
All options specific to device `genesys:libusb:003:002':
Scan Mode:
--mode Color|Gray|Lineart [Gray]
Selects the scan mode (e.g., lineart, monochrome, or color).
--source Flatbed|Transparency Adapter [inactive]
Selects the scan source (such as a document-feeder).
--preview[=(yes|no)] [no]
Request a preview-quality scan.
--depth 8|16 [8]
Number of bits per sample, typical values are 1 for "line-art" and 8
for multibit scans.
--resolution 1200|600|300|150|75dpi [75]
Sets the resolution of the scanned image.
Geometry:
-l 0..218mm [0]
Top-left x position of scan area.
-t 0..299mm [0]
Top-left y position of scan area.
-x 0..218mm [218]
Width of scan-area.
-y 0..299mm [299]
Height of scan-area.
Enhancement:
--custom-gamma[=(yes|no)] [no]
Determines whether a builtin or a custom gamma-table should be used.
--gamma-table 0..65535,... [inactive]
Gamma-correction table. In color mode this option equally affects the
red, green, and blue channels simultaneously (i.e., it is an intensity
gamma table).
--red-gamma-table 0..65535,... [inactive]
Gamma-correction table for the red band.
--green-gamma-table 0..65535,... [inactive]
Gamma-correction table for the green band.
--blue-gamma-table 0..65535,... [inactive]
Gamma-correction table for the blue band.
--swdeskew[=(yes|no)] [no]
Request backend to rotate skewed pages digitally
--swcrop[=(yes|no)] [no]
Request backend to remove border from pages digitally
--swdespeck[=(yes|no)] [no]
Request backend to remove lone dots digitally
--despeck 1..9 (in steps of 1) [1]
Maximum diameter of lone dots to remove from scan
--swskip 0..100% (in steps of 1) [0]
Request driver to discard pages with low numbers of dark pixels
--swderotate[=(yes|no)] [no]
Request driver to detect and correct 90 degree image rotation
Extras:
--lamp-off-time 0..60 [15]
The lamp will be turned off after the given time (in minutes). A value
of 0 means, that the lamp won't be turned off.
--lamp-off-scan[=(yes|no)] [no]
The lamp will be turned off during scan.
--threshold 0..100% (in steps of 1) [50]
Select minimum-brightness to get a white point
--threshold-curve 0..127 (in steps of 1) [50]
Dynamic threshold curve, from light to dark, normally 50-65
--disable-dynamic-lineart[=(yes|no)] [no]
Disable use of a software adaptive algorithm to generate lineart
relying instead on hardware lineart.
--disable-interpolation[=(yes|no)] [no]
When using high resolutions where the horizontal resolution is smaller
than the vertical resolution this disables horizontal interpolation.
--color-filter Red|Green|Blue|None [None]
When using gray or lineart this option selects the used color.
Sensors:
Buttons:
--clear-calibration
Clear calibration cache
这里还有一个有趣的事情:简单的扫描( Linux的扫描程序)还是设法从图像与此扫描仪中取出灰色:
我不知道,如果它使用了一些后扫描处理,或者如果它知道如何分辨扫描仪关于对比。如果它是前者,是否有任何Java库可以消除这种灰色噪音?
我怀疑简单的扫描使用后期处理,只是二值化图像。那就是:设置一个阈值,任何灰度值> t设置为255的像素,否则设置为0.您确实尝试了线性模式,不是吗? – Fildor
@Fildor是的,我尝试使用不同的阈值进行线条划分,但结果非常糟糕:图像上的黑点和污点以及字母变得“尖锐”。 –
在艺术线条模式下,您是否尝试使用去斑处理? (--swdespeck和--despeck) – Fildor