Method of determining and correcting processing state of photosensitive material based on mahalanobis calculation
First Claim
1. A method of determining the processing state of a photosensitive material, comprising the steps of:
- preparing a Mahalanobis space on the basis of characteristic values of a processing solution for a photosensitive material in a normal state or respective characteristic values of the processing solution and a processing condition for the photosensitive material in the normal state;
calculating a Mahalanobis distance on the basis of the Mahalanobis space; and
determining the state of at least one of the processing solution and the processing condition on the basis of the Mahalanobis distance calculated.
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Abstract
The state of a photosensitive material processing solution is easily determined from values of multi-dimensional analysis by utilizing Mahalanobis distance. The Mahalanobis distance is calculated, and a determination is made as to whether or not the Mahalanobis distance is greater than or equal to a threshold value. If the Mahalanobis distance is less than the threshold value, the processing solution is determined to be normal, the Mahalanobis distance is displayed on a display unit, and a determination is made as to whether or not the number of sets m of normal values has become greater than or equal to a predetermined value m0. If m≧m0, data of the characteristic values in the oldest set in a time series is deleted, and a set of data of newly detected characteristic values is added to calculate the Mahalanobis distance and update a database. If the Mahalanobis distance is greater than or equal to the predetermined value, a developing solution is determined to have become abnormal, the degree of abnormality is displayed, factors which caused the abnormality are determined, a corrective measure is determined on the basis of a combination pattern of factors, and the measure is displayed.
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Citations
23 Claims
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1. A method of determining the processing state of a photosensitive material, comprising the steps of:
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preparing a Mahalanobis space on the basis of characteristic values of a processing solution for a photosensitive material in a normal state or respective characteristic values of the processing solution and a processing condition for the photosensitive material in the normal state; calculating a Mahalanobis distance on the basis of the Mahalanobis space; and determining the state of at least one of the processing solution and the processing condition on the basis of the Mahalanobis distance calculated. - View Dependent Claims (7, 9, 11, 13, 15, 17, 19, 21, 23)
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2. A method of determining the processing state of a photosensitive material, comprising the steps of:
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detecting n (where n≧
ak if a is assumed to be a positive integer greater than or equal to
1) sets of k (where k is an integer≧
2) kinds of characteristic values with respect to a processing solution for processing a photosensitive material, or the processing solution and a processing condition for processing the photosensitive material;calculating a Mahalanobis distance (MD2) which is expressed by a formula below with respect to a combination of the k kinds of characteristic values Yi,j (where, i is the number of characteristic values, and i=1, 2, 3, . . . , k; and
j is the number of sets of characteristic values, and j=1, 2, 3, . . . , n) detected at the time of conducting the determination of the state;and determining the state of at least one of the processing solution and the processing condition on the basis of a magnitude of the Mahalanobis distance calculated ##EQU5## where apq is a component of an inverse matrix R-1 of a correlation matrix R having as its components correlation coefficients rp,q (where, p, q=1, 2, 3, . . . , k) between a p-th standardized characteristic value yp and a q-th standardized characteristic value yq among k standardized characteristic values yi of a set of number j, and is a value indicating a Mahalanobis space prepared in advance on the basis of the k kinds of n sets of the characteristic values of the processing solution and the processing condition in a normal state, a standardized characteristic value yi,j of the set of number j being expressed by a following formula by using an average value mi of the characteristic value of number i and a standard deviation σ
i of the characteristic value of number i;
space="preserve" listing-type="equation">y.sub.i,j =(Y.sub.i,j -m.sub.i)/σ
.sub.iwhere
space="preserve" listing-type="equation">m.sub.i =(Y.sub.i,1 +Y.sub.i,2 +. . . +Y.sub.i,n)/n
space="preserve" listing-type="equation">σ
.sub.i.sup.2 =[(Y.sub.i,1 -m.sub.i).sup.2 +(Y.sub.i,2 -m.sub.i).sup.2 +. . . (Y.sub.i,n -m.sub.i).sup.2 ]/(n-1). - View Dependent Claims (3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22)
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Specification