Method and circuit arrangement for partial recorrection of color

Details Method and circuit arrangement for partial recorrection of color Method and circuit arrangement for partial recorrection of color

1981-09-10

1984-08-07

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 78, 358 80, H04N 146

Patent

active

044646771

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to technical fields in which colors must be recognized, particularly relating to color recognition in electronic reproduction technology.
2. Description of the Prior Art
Method for recognizing colors are known from the German Patents (patent application Nos. P 29 23 473.9, P 29 23 468.2 or P 29 23 477.3) in which, before the actual color recognition, the color components of at least one characteristic sample point are opto-electrically determined in each color to be discriminated, whereby the color components represent the spatial coordinates of the respective color locations in the three-dimensional color space. Color numbers are allocated to the color component triads of the measured sample points and the color numbers are deposited under those addresses of a color recognition memory which coincide with the appertaining color component triads. In the color recognition memory, each memory location corresponds to a color location of the color space.
Subsequently, the still-missing color numbers of the remaining color locations are automatically determined from the color numbers of the sample color locations and are likewise deposited under the corresponding addresses of the color recognition memory. All color locations occupied with the same color number respectively form a bounded color recognition space of one color or of a spatial color region within the color space.
During the actual color recognition, the colored surfaces to be analyzed are opto-electrically scanned point and linewise and the color components thereby gained call in the corresponding addresses of the color recognition memory. The color numbers deposited there are read out, whereby the association of the scanned colors to the bounded color recognition spaces is determined.
The size, shape and position of a color recognition space in the color space determine the spatial color region which is evaluated in the color recognition as belonging to one color. For the purpose of a precise color determination, therefore, it is necessary that the boundaries of the individual color recognition spaces be matched as well as possible to the color regions to be separated. In the known method, this demand is met by a sufficiently large plurality of targeted color samples taken per color region. Nonetheless, in practice, it occasionally turns out only after the color recognition, for example, on the basis of a color separation, that, for the purpose of an even better color separation, the limitation of one or more color recognition spaces must be partially changed or that the color space must be subdivided into even finer color recognition spaces. In this case, given the known method, new color samples must be taken, the color numbers must be recalculated, and the color recognition memory must again be filled. These measures, however, mean a longer preparation time for the actual color recognition.
Refer to FIG. 6 which shows the Prior Art.
The image to be analyzed may be an image or pattern for multiple color printing, or for textile printing, decorative printing or package printing, or also a design pattern for obtaining control data for textile processing machines. The colored image may include a color printing medium and generally any colored surface or plane.
The colored image will generally include separate, adjoining colors, and colors vignetting into one another. The individual colors may, for example, due to color tolerances or due to an irregular application of the color, show color deviations. During color recognition, the problem arises to separate the individual colors from one another, or, if necessary, to combine color deviations in the colored image into a single color. In colors vignetting into one another, namely in colors showing gradual saturation and/or brightness changes, such color deviations have been intended by the designer. The color recognition process must cope with the problem to either separate the colors vignetting into one another, or, if necess

REFERENCES:
patent: 3752590 (1973-08-01), Frappe
patent: 3878384 (1975-04-01), Bowker
patent: 4110826 (1978-08-01), Mollgaard et al.
patent: 4204223 (1980-05-01), Gast
patent: 4328515 (1982-05-01), Wellendorf

Affiliated with

Also associated with

Rating

Method and circuit arrangement for partial recorrection of color does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and circuit arrangement for partial recorrection of color, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and circuit arrangement for partial recorrection of color will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-605465