EP0255127A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Simulator for automatic photographic printing apparatus
Assignee: Fujifilm Holdings Corp
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Filing: 1987-07-29
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Granted: —
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Expires: 2007-07-29
Abstract
Abstract A simulator for use in an automatic photographic printing apparatus of the type in which a negative image carried by a color negative film is printed on a photographic paper by a light source system which is under an automatic exposure control, the simulator having a CRT for displaying a positive image corresponding to the negative image. The simulator includes an inversion circuit for inverting the output rom an image pickup device for picking up the image of the negative image, thus enabling the positive image corresponding to the negative image to be obtained, a first conversion circuit connected to the input of the inversion circuit and adapted for effecting a compensation for any difference between the integrated density of the negative image as sensed with the spectral sensitivity of the image pickup device and the integrated density of the negative image as sensed with the spectral sensitivity of the photographic paper, and a second conversion circuit connected to the output of the inversion circuit and adapted for substantially equalizing first tristimulus values according to the emission spectral characteristics of the fluorescent substance on the CRT means and second tristimulus values according to dye absorption characteristics of the print. In consequence, a positive image which is the same as the image to be obtained by the print is automatically displayed on the CRT with a high degree of accuracy.
Inventors
- 👤 Toru Fuji Photo Film Co. Ltd. Matama
- 👤 Tsuneo C/O Fuji Photo Film Co. Ltd. Suzuki
- 👤 Koji C/O Fuji Photo Film Co. Ltd. Takahashi
- 👤 Kenji C/O Fuji Photo Film Co. Ltd. Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:13
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73; G03B27/735; H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6011
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
284 words
I. A simulator for use in an automatic photographic printing apparatus of the type in which a photographic paper is exposed to a negative image carried by a negative film by means of a light source system which undergoes a light adjustment conducted by an automatic exposure control function of the automatic photographic printing apparatus, said simulator being adapted for displaying a positive image corresponding to said negative image in accordance with an output signal from an image pickup device which picks up said negative image on said negative film while said negative film is illuminated by said light source system under said light adjustment and delivers said output signal corresponding to said negative image, characterized by comprising: inversion means for inverting said output from said image pickup device so as to enable said positive image corresponding to said negative image to be produced; display means for displaying said positive image in accordance with the output from said inversion circuit; and first conversion means connected to the input of said inversion means and second conversion means connected to the output of said inversion means, said first conversion means and said second conversion means being adapted for effecting a compensation for any difference between the integrated density of said negative image as sensed with the spectral sensitivity of said image pickup device and the integrated density of said negative image as sensed with the spectral sensitivity of said photographic paper, and also adapted for substantially equalize first tristimulus values according to the emission spectral characteristics of the fluorescent substance on said display means and second tristimulus values according to dye absorption characteristics of the print obtained from the photographic paper printed with said negative image.
Claim 2
Dependent Claim
57 words
A simulator for use in an automatic photographic printing apparatus according to Claim I, wherein said first conversion means is adapted for conducting said compensation for said difference by converting said output signal from said image pickup device, while said second conversion means is arranged for substantially equalizing said first tristimulus values and said second tristimulus values.
Claim 3
Dependent Claim
40 words
A simulator for use in an automatic photographic printing apparatus according to Claim 2, wherein each of said first conversion means and said second conversion means includes 3 x 3 matrix means which employs cubic square matrix components as parameters.
Claim 4
Dependent Claim
47 words
A simulator for use in an automatic photographic printing apparatus according to Claim 2, further comprising a logarithmic conversion means for conducting a logarithmic conversion of said output signal from said image pickup device, so as to deliver a transmission density signal to said first conversion means.
Claim 5
Dependent Claim
40 words
A simulator for use in an automatic photographic printing apparatus according to Claim I, wherein said inversion means is adapted for conducting a negative/positive conversion of the output from said image pickup device into analytical density of said photographic paper.
Claim 6
Dependent Claim
57 words
A simulator for use in an automatic photographic printing apparatus according to Claim 5, wherein said second inversion means includes first 3 x 3 matrix means, inverse logarithmic conversion means and second 3 x 3 matrix means which are connected in series between the output of said negative/positive inversion means and the input of said display means.
Claim 7
Dependent Claim
66 words
A simulator for use in an automatic photographic printing apparatus according to Claim I, further comprising logarithmic conversion means for converting the output of said image pickup device into transmission density signal, said inversion means being adapted for converting said transmission density signal into a reflective density corresponding to the amount of dyes of the print obtained from the photographic paper printed with said negative image.
Claim 8
Dependent Claim
48 words
A simulator for use in an automatic photographic printing apparatus according to Claim 7, wherein said second conversion means includes inverse logarithmic conversion means adapted for conducting an inverse logarithmic conversion of the output from said inversion means thereby converting said output into a signal corresponding to transmittance.
Claim 9
Dependent Claim
65 words
A simulator for use in an automatic photographic printing apparatus according to Claim 8, wherein said second conversion means includes third conversion means adapted for converting said transmission density signal inverted by said inversion means so as to correspond only to the main absorption of dyes, and fourth conversion means for converting the signal corresponding to said transmittance into luminance signal of said display means.
Claim 10
Dependent Claim
40 words
A simulator for use in an automatic photographic printing apparatus according to Claim 9, wherein each of said third conversion means and said fourth conversion means includes 3 x 3 matrix means which employs cubic square matrix components as parameters.
Claim 11
Dependent Claim
248 words
II. A simulator for use in an automatic photographic printing apparatus of the type in which a photographic paper is exposed to a negative image carried by a negative film by means of a light source system which undergoes a light adjustment conducted by an automatic exposure control function of the automatic photographic printing apparatus, said simulator including display means and being adapted for displaying a positive image corresponding to said negative image in accordance with a transmission density signal obtained from an image pickup device which picks up said negative image on said negative film while said negative film is illuminated by said light source system under said light adjustment, characterized by comprising: inversion means for converting said transmission density signal into a reflective density corresponding to the amount of dyes of the print obtained from the photographic paper printed with said negative image; inverse logarithmic conversion means for conducting an inverse logarithmic conversion of the output from said inversion means thereby converting said output into a signal corresponding to transmittance; and first conversion means connected to the input of said inverse logarithmic conversion means and second conversion means connected to the output of said inverse logarithmic conversion means, said first and second conversion means being adapted for converting said transmission density signal inverted by said inversion means so as to correspond only to the main absorption of dyes, and also adapted for converting the signal corresponding to said transmittance into luminance signal of said display means.
Claim 12
Dependent Claim
63 words
A simulator for use in an automatic photographic printing apparatus according to Claim II, wherein said first conversion means is constituted so as to convert said transmission density signal to correspond only to the main absorption of dyes, while said second conversion means is constituted so as to convert the signal corresponding to said transmittance into the luminance signal of said display means.
Claim 13
Dependent Claim
40 words
A simulator for use in an automatic photographic printing apparatus according to Claim 12, wherein each of said first conversion means and said second conversion means includes 3 x 3 matrix means which employs cubic square matrix components as parameters.
Claim 14
Dependent Claim
40 words
A simulator for use in an automatic photographic printing apparatus according to Claim 12, further comprising a logarithmic conversion means for conducting a logarithmic conversion of the output signal from said image pickup device to output said transmission density signal.
Claim 15
Dependent Claim
81 words
A simulator for use in an automatic photographic printing apparatus according to Claim 14, further comprising third conversion means which is connected to the output of said logarithmic conversion, said third conversion means is constituted so as to effect a compensation for any difference between the integrated density of said negative image as sensed with the spectral sensitivity of said image pickup device and the integrated density of said negative image as sensed with the spectral sensitivity of said photographic paper.
Claim 16
Dependent Claim
33 words
A simulator for use in an automatic photographic printing apparatus according to Claim 15, wherein said third conversion means comprises 3 x 3 matrix means which employs cubic square matrix components as parameters.
References Cited (Backward Citations)
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