Digital exposure system of black-and-white photograph for credentials such as identity card

Abstract

The system comprises a cabinet, a case cover as well as photographic objective and exposure system in the cabinet. The photographic objective is setup at top center of the cabinet. Dedicated film printing desk is at upper part of the photographic objective. The said exposure system consists of computer, luminescent screen and card reader. The invention completely replaces the traditional procedure of using roll film or film to prepare picture from black/white photograph. Overall process is fulfilled through computer operation so as to omit fussy operation procedure, save operation cost and time. The invention possesses effect of environmental protection, easy of use, and is suitable for use in rural district and remote mountainous area.

Description

technical field [0001] The invention relates to the field of photographic equipment, in particular to a digital exposure device for black-and-white photos used in certificates such as citizen ID cards. Background technique [0002] Black and white photos are widely used at home and abroad to make ID cards, marriage certificates, passports and other documents that need to be stored for a long time due to their long storage time, extremely stable dye performance, and not easy to fade. The production process is as follows: After the photosensitive black-and-white film or film is developed and fixed, a black-and-white negative film showing a negative image is obtained, and then the negative film is printed on traditional black-and-white photo paper by contact printing or enlargement. Conventional black and white photos are obtained after developing, fixing, washing and drying. In recent years, with the continuous development of science and technology, the acquisition of traditi...

AI Technical Summary

Problems solved by technology

[0005] (2) Two strict development and fixing processes (film and photo paper) are required, and it must be operated in complete darkness or under a special safety light, which is prone to errors, especially for film, any light leakage, excessive development, Insufficiency will cause the interruption and stop of the entire operation. At this time, it is often necessary to retake or take supplementary photos, which will cause losses and troubles to both the operator and the subject.

[0006] (3) Due to the characteristics of photosensitive materials and other reasons in traditional black-and-white photos, the development effect of photos needs to be observed completely with the naked eye under the safe light in the darkroom. , it is more difficult to realize the automatic processing of photo developing, fixing, washing and drying, only a single small batch production can be carried out, the consistency between the front and back is poor, and the production of large batches cannot be realized

[0007] (4) The whole process of making black and white photos is a purely physical and chemical process. For some photos with special requirements, such as photos for citizen ID cards, it requires accurate control of the width and height of the character's head, which requires skilled photography. Technology, once shooting, it is difficult to change the size of the head of the character in the later stage, the photography efficiency is low, and it is difficult to make a one-to-one correspondence between negatives and getting along with each other when shooting in large quantities

Therefore, using traditional techniques to produce black and white photos is both professional and complicated, time-consuming and labor-intensive

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