JPH0384680U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1A and FIG. 1B are block diagrams corresponding to the first and second configurations of this invention, respectively.
The figure is a perspective view of the external appearance of a color scanner system for plate making, which is an embodiment of this invention, and Figure 3 is a block diagram of the scanner body equipped with an analog color calculation circuit.
Fig. 4 is a block diagram of a color separation auxiliary device that can be used in combination with the scanner body shown in Fig. 3, Fig. 5 is a flowchart showing the overall operation of the embodiment, and Fig. 6 is the standard of the original image. FIG. 7 is an explanatory diagram showing the process of determining the concentration value as information usage relationships; FIG. 7 is a flowchart showing the routine for determining the reference concentration value;
8 is a diagram showing an average density value frequency histogram, FIG. 9 is a diagram showing a cumulative density value histogram for each color component, FIG. 10 is a diagram showing a cumulative relative frequency histogram, and FIG. 11 is a diagram showing a cumulative relative frequency histogram. FIG. 8 is an explanatory diagram of the process of calculating the average density value from a part of the histogram. FIG. 12 is an explanatory diagram showing the relationship of information usage in the process of determining the curve shape for tone correction. 14 is a flowchart showing the signal acquisition operation in the color separation auxiliary device, and FIG. 15 is a diagram showing the signal acquisition timing in the color separation auxiliary device. 16 is a block diagram showing a color separation auxiliary device that can be used in combination with a scanner body equipped with a digital color calculation circuit, and FIG. 17 is a partial block diagram of the scanner equipped with a digital color calculation circuit. It is a diagram. 1...Color scanner system for plate making, 2...
Transmission cable, 100,300... Scanner main body, 200,400... Color separation auxiliary device, DB, D
G, DR...color density signal, DNB', DNG',
NNR...normalized color density signal, DHX...
...Highlight density value, DSX...Shadow density value, GXD...Normalization curve.

Claims (1)

[Claims for Utility Model Registration] (1) A color separation system for color-separating a color image provided from an image input means by a color separation circuit, comprising: (a) density signals for each color component of the image; is input pixel by pixel from the image input means, and by statistically processing the density distribution of each color component in the image, automatically determining color separation conditions for color separation of the image, (b) automatic color separation condition setting means for setting the color separation conditions in the color separation circuit; A color separation system comprising: correction means for correcting separation conditions. (2) The color image inputted from the image input means is color-separated by a color separation circuit coupled to the color separation condition manual setting means, and the color-separated image signals obtained thereby are outputted to the image output means. A color separation auxiliary device used in combination with an image processing device that outputs a predetermined image by applying a signal to the image input means, the color separation auxiliary device comprising: (a) being connectable to the image input means;
(b) signal input means for inputting a density signal for each color component of the image transmitted from the image input means; (b) inputting the density signal from the signal input means during pre-scanning of the image, and inputting the density signal for each color component in the image; Statistically process the distribution of the concentration of
(c) density conversion characteristic automatic determination means for automatically determining a density conversion characteristic for each color component of the image based on the statistical processing; (c) the density conversion characteristic is set and the predetermined image processing is performed on the image; (d) a density conversion circuit to which the density signal is applied via the signal input means during the main scan of the image for performing the image processing; and a signal output means for outputting a signal to the color separation circuit, and the color separation means for the image can be configured by functionally coupling the density conversion circuit and the color separation circuit via the signal output means. A color separation auxiliary device characterized by: