Image analysis – Color image processing
Reexamination Certificate
1999-01-21
2003-09-30
Boudreau, Leo (Department: 2621)
Image analysis
Color image processing
C358S518000, C358S001150
Reexamination Certificate
active
06628822
ABSTRACT:
DESCRIPTION
Transmission Apparatus, Transmitting Method, Reception Apparatus, Reception Method, Picture Processing System, Picture Processing Method, Picture Data Processing Apparatus, Picture Data Processing Method and Furnished Medium
1. Technical Field
This invention relates to a transmission apparatus, a transmitting method, a reception apparatus, a reception method, a picture processing system, a picture processing method, a picture data processing apparatus, a picture data processing method and a furnished medium. More particularly, it relates to a transmission apparatus, a transmitting method, a reception apparatus, a reception method, a picture processing system, a picture processing method, a picture data processing apparatus, a picture data processing method and a furnished medium whereby coincidence in picture appearance can be achieved.
2. Background Art
Heretofore, when picture data are transmitted between devices capable of retrieving or outputting pictures, including printing a picture on paper and outputting or displaying the printed picture, such as CRT monitors, printers, scanners or video cameras, or when a picture retrieved by or displayed on a device (input device) is outputted by or displayed on another device (output device), such as by printing on a paper sheet, processing is performed on the basis of picture -data, such as RGB data or CMY(K) data, defined separately on the input device or the output device. The result is that, due to the difference in device characteristics, such as difference in characteristics of filters enclosed in the devices or characteristics of the phosphor or ink, picture deviation occurs between the picture of the input device and that of the output device.
There is known such a method in which the color space of picture data defined from device to device is converted into a color space prescribed by an intermediate color space, such as XYZ(CIE/XYZ) or L*a*b*(CIE/L*a*b*) provided by CIE, so that the picture color is the same on the calorimetric level as long as the picture data is the same in this intermediate color space, no matter which device is used to output the picture corresponding to the picture data.
For color space conversion, the relation of correspondence between RGB as device-based picture data and XYZ as corresponding intermediate color space data, for example, is stated in the form of a conversion table or a conversion equation, known as profile, is used.
This profile is formulated from device to device by measuring the colors of a picture outputted by a device when various picture data are entered to the device, detecting the values of picture data obtained from a device when pictures of various colorimetric values are entered to the device and by correlating the picture data with the colorimetric values.
Thus, by a profile formulated for a device A, the RGB data defined for the device A are converted into XYZ data corresponding to the colorimetric values of the associated picture. Therefore, if the XYZ data is converted into RGB data defined for another device B using a profile formulated for the device B, a picture having the same color (colorimetric values) as that in the device A is obtained in the device B.
With the profile of the device B, the RGB data defined for the device B are converted into XYZ data corresponding to the calorimetric values of the associated picture. Therefore, if the XYZ data is converted into RGB data defined for the device A, using the profile for the device A, a picture having the same color (colorimetric value) as that of the picture in the device B is obtained in the device A.
Since the data (picture data) converted by the profile into the intermediate color space is device-independent, it is termed device independent color or device independent data. This data is herein abbreviated occasionally to DIC. On the other hand, the data (picture data) defined from device to device is termed device dependent color or device dependent data. This data is herein abbreviated occasionally to DDC.
FIG. 38
is a block diagram showing the structure of an example of a picture processing system configured for exchanging picture data using the above-described profile, and
FIG. 39
shows the stream of data in the picture processing system of FIG.
38
.
Referring to
FIG. 38
, if a scanner
43
is an input device and a CRT monitor
42
and a printer
44
are output devices, the scanner
43
retrieves a picture drawn on paper (retrieved picture) to generate RGB data corresponding to the picture (such as RGB data as DDC defined in the scanner
43
). These RGB data are routed to a converter
412
and converted to, for example, XYZ data as DIC using the profile for the scanner
43
pre-formulated and stored in the converter
412
. The resulting XYZ data is outputted to a mapping unit
414
.
The mapping unit
414
is configured as shown for example in FIG.
40
. XYZ data from the converter
412
are converted by a converter
414
a into data on the L*a*b* space which is the visually equalized space (L*a*b* data). The converted data is outputted to a mapping table
414
d
in which the L*a*b* data from the converter
414
a
is processed by, for example, compression of the color reproducing area (color gamut).
It is not all colors corresponding to the picture data generated by the scanner
43
that can be regenerated by the CRT monitor
42
or the printer
44
. Thus, the mapping table
414
d
performs compression processing of the color reproducing area which is the processing of mapping the L*a*b* data from the converter
414
a
, that is colors that can be handled by the scanner
43
, but that cannot be handled by the CRT monitor
42
or the printer
44
, to colors that are closest to the colors and that can be handled by the CRT monitor
42
or the printer
44
.
In the mapping table
414
d
, there is stored the relation of correspondence between the color reproducible area (color gamut) of an input device and the color reproducible area (color gamut) of an output device, wherein the input and output devices are the CRT monitor
42
, scanner
43
and the printer
44
. For example, if the L*a*b* data from the converter
414
a
, is inputted as an address, the L*a*b* data associated therewith are outputted to converters
414
b
or
414
c.
In the converters
414
b
or
414
c
, L*a*b* data outputted by the mapping table
414
d
are converted into XYZ data which are outputted to the converter
411
or
413
.
In the converter
411
, XYZ data as DIC data from the mapping unit
414
(converter
414
b
) is converted into, for example, RGB data, as DDC, using the pre-formulated and stored profile for the CRT monitor
42
. The converted RGB data is supplied to the CRT monitor
42
. On the CRT monitor
42
, a picture corresponding to the RGB data from the converter
411
is displayed, that is, the display picture is outputted.
In the converter
413
, XYZ data as DIC data from the mapping unit
414
(converter
414
b
) is converted into, for example, CMY(K) data, as DDC, using the pre-formulated and stored profile for the printer
44
. The converted CMY(K) data is supplied to the printer
44
. On the printer
44
, a picture corresponding to the CMY(K) data from the converter
413
is printed on printing paper sheet, that is a printed picture is outputted.
Meanwhile, since the CRT monitor
42
can be used not only as an output device but also as an input device, like the scanner
43
, the displayed picture, CRT monitor
42
, converter
411
and the mapping unit
414
are interconnected by double-headed arrows in
FIGS. 38 and 39
.
If the picture retrieved by the scanner
43
is outputted by the CRT monitor
42
or the printer
44
, the display picture or the printed picture has the same colorimetric value as that of the retrieved picture, thus preventing color deviation from occurring.
If, when using the profile, the calorimetric condition at the time of profile formulation differs from the viewing condition in which the retrieved picture, printed picture or the displayed picture is viewed, such as luminance or chro
Kato Naoya
Nakabayashi Kiyotaka
Boudreau Leo
Kananen, Esq. Ronald P.
Sherali Ishrat
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