JPH0746206B2 - Photographic printing exposure correction amount determination device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic printing exposure correction amount determination device in a photographic printer.

-Background of the Invention-For photoprinting, an optical printer is known in which a development film image is formed on a color paper by an optical system. In the photoprinting process with this optical printer, the negative image of the developed film is not necessarily taken under the proper conditions for printing, but it may include overexposure, various exposure light sources, defocus, and film color sensitivity. It is necessary to find the optimum printing conditions for the image due to various factors.

Therefore, in the photo printing, the correction amount for the printing conditions is determined by determining the characteristics of each frame of the negative image during printing. At present, to determine the optimum burn-up degree of a negative image, the average transmission density of each frame of the negative image or the transmission density of a plurality of divided areas is measured, and the classification of the subject scene and the scene are performed based on the density difference and the density distribution. Photographic printing conditions are determined by a statistical method according to the above.

-Problems to be solved by the invention-Because a conventional exposure correction amount determination device uses a method based on a statistical method from the density distribution of each part of the negative image region,
Inappropriate printing conditions may be set depending on the exposure state of the negative image, and reprinting of several percent is performed in the photographic printing work.

An object of the present invention is to reduce unnecessary photo printing by using a photo printing exposure correction amount determination device, and perform printing under the most preferable printing conditions for complicated and diversified images.

-Means for Solving the Problems-In order to achieve the above-mentioned object, the present invention determines a photographic printing exposure correction amount for determining an exposure amount for exposing a photographic light-sensitive material to a negative image recorded on a photographic film. In the apparatus, an image reading unit that reads a photographic film image, a plurality of image processing units that process image information output from the image reading unit and determine an exposure correction amount for the film image, and the plurality of image processing units is characterized in that the are selected or binding the individual exposure correction amount output from each of the information processing means (9 ₄₎ to finalize the exposure correction amount with respect to the photographic film image is composed of . -Embodiment- The figure is a device configuration diagram showing an embodiment of the present invention. The negative film portion 1 includes a roll film in which a large number of negative films are connected and wound, and its roller, and is wound from the rewinding tip of the film 2 to the film winding portion 3 by frame feeding. The negative printing unit 4 is configured to print a negative image for each frame on the photographic printing paper 5 while the negative film 2 is being transferred. The photographic printing paper 5 is taken out from the paper rewinding section 6 as roll paper, passed through the baking portion of the negative baking section 4, and taken up by the paper winding section 7.

The negative reading unit 8 is located in front of the negative printing unit 4 and reads the transmission density of the film 2 for each frame and for each pixel. The negative discrimination processing unit 9 takes in the image signal from the image reading unit 8 and determines the optimum printing condition of the negative printing unit 4 from the image signal.

The negative discrimination processing unit 9 uses, for example, a negative determination on a given negative image by a statistical method (for example, Japanese Patent Laid-Open No. 56-269).
Statistical determination means 9 ₁ for 1 JP), for the typical pattern by negative image given in advance stores a pattern of a typical Negashin To determine whether similar to what pattern using basic exposure correction amount comprises a plurality of different image processing means such as pattern recognition specific determination means 9 ₂ for negative determination (for example, JP 59-67526). Then, the printing condition determining means 9 ₄ determines the result of judgment by the statistical judgment means 9 ₁ and the pattern recognition judgment means 9 ₂ by the negative judgment methods different from each other by a statistical method or an evaluation formula. Whether the value is a value or not, and if the photoprinting is possible, one of the judgment values or a new judgment value is obtained from these judgment values to perform the photoprinting. When it is determined that photo printing is impossible, the operator is requested to make a negative determination. Now, the negative judging means 9
_When the exposure correction amount obtained in ₁ is X and the exposure correction amount obtained in the negative judging means 9 ₂ is Y, the evaluation value Z is obtained from the following relational expression. A and B are coefficients for calculating the evaluation value.

Z = A · X−B · Y Now, when the following relations exist for the reference evaluation values α, β, γ, the following relations hold for the values of α <β <γ evaluation values Z. When Z is α or less or γ or more, the printing condition determining means 94 requests the operator to judge that the exposure correction amount obtained by the negative judging means 9 ₁ and 9 ₂ is unsuitable as the photographic printing condition. When Z has a relationship of α <Z <β, the judgment result of the negative judging means 9 ₁ is used. On the other hand, when β <Z <γ, the photographic printing is performed using the judgment result of the negative judging means 9 ₂ .

Although two negative judgment means are used in the embodiment, the same processing can be performed when three or more negative judgment means are used.

Further, in the embodiment, when it is determined that the exposure correction amount is inappropriate, the operator is requested to make a determination. However, automatic reprinting of photographic prints can be performed by processing with a scanner printer system that can automatically perform image processing. You can also do it.

Further, in the embodiment, not only the exposure correction amount in which one is selected from a plurality of negative determination results but also the total exposure correction amount may be determined from a plurality of determination results.

-Effects of the Invention-As is apparent from the above description, the present invention determines image characteristics by using a plurality of different image processing means for read information of a photographic film image to determine exposure conditions. Therefore, there is an effect that unnecessary photo printing is reduced and printing is performed under the most preferable printing conditions for complicated and diversified images.

[Brief description of drawings]

The drawings are device configuration diagrams showing an embodiment of the present invention. 2 ... film, 4 ... optical printer, 5 ... sensitive material,
8 ... Image reading unit, 9 ... Negative discrimination processing unit, 9 ₁ ......
Statistical judgment means, 9 ₂ ... Pattern recognition judgment means, 9 ₄
...... Means for determining printing conditions.

Claims (1)

[Claims] 1. A photographic printing exposure correction amount determining apparatus for determining an exposure amount for exposing a photographic light-sensitive material to a negative image recorded on a photographic film, an image reading unit for reading a photographic film image, and the image reading unit. A plurality of image processing means for processing the image information output from, determining the exposure correction amount for the film image, and selecting or combining the individual exposure correction amounts output from each of the plurality of image processing means, said photographic information processing means (9 ₄₎ to finalize the exposure correction amount with respect to the film image and, photographic printing exposure correction amount determination apparatus characterized by being composed.