Nondestructive quick file photographing instrument

Abstract

The invention provides a nondestructive quick file photographing instrument which can conveniently and quickly complete the processing to file digitization with high quality, and comprises a box body, wherein the top surface or the bottom surface of the box body is provided with a file bracket, the box body is internally provided with an image sensor which is opposite to the file bracket, the boxbody is internally provided with a plurality of directional light sources directing different positions, so that the brightness at the central position of the file bracket is gradually weakened compared with the brightness at the edge position of the file bracket, the directional light sources are arranged outside the view angle of the image sensor, and at least opposite edges of the view field of the image sensor are coincided with the corresponding edges of the file bracket opposite to the image sensor. The invention has the advantages that the 'double-zero margin' processing function is provided, binding disassembling is free, and the operation is simple and convenient; and simultaneously, a stable non-uniform illuminating system with the best illuminating degree is configured, so thatthe influences of external lighting conditions are free; and the obtained image exposure is correct and uniform, and the postprocessing is convenient.

Description

technical field [0001] The invention belongs to the technical field of digital processing of books, archives, documents, etc., and in particular relates to a non-damaging rapid document camera. Background technique [0002] At present, many paper documents need to be digitized and processed into electronic documents to facilitate circulation, storage and processing. Now the main equipment for digital processing is various types of scanners. With the popularization of digital photography technology, more and more digital cameras are used for digital processing of documents. A computer-connected camera that stores captured images directly to the computer. There are following problems in the working mode of above-mentioned scanner and digital camera: [0003] 1. The object being photographed is flat. The objects to be photographed must be placed flat to take pictures that meet the quality requirements. However, most of the objects to be photographed are books, files, documen...

AI Technical Summary

Problems solved by technology

The objects to be photographed must be placed flat to take pictures that meet the quality requirements. However, most of the objects to be photographed are books, files, documents, etc. that are bound into volumes. There are two ways to solve the problem of flatness, dismantling the binding and flattening , the dismantling and binding processing method is not only cumbersome in the workflow (dismantling and binding, and then rebinding after scanning), but also greatly damages the processing objects due to disassembly and rebinding. A long time ago, the paper is fragile and cannot be processed by dismantling and binding

In order to solve the problem of dismantling and binding, "single-sided zero-margin scanners" have appeared in recent years, but "single-sided zero-margin scanners" only solve the problem of single-sided zero-margins due to their structural characteristics. Each time a person scans a page, the processing object must be rotated 180° to scan the next page and complete the scanning of odd and even pages. This operation method is cumbersome and inefficient

It is possible to process without dismantling the binding by taking pictures with a digital camera, but the document to be photographed must be flattened to solve the problem of bending and deformation of the photographed image

The flattening operation of the traditional overhead shooting method is relatively difficult. It is necessary to use special tools to flatten the curved or uneven photographing surface, and it cannot block the angle of view of the lens. Image Quality

[0004] 2. Exposure uniformity problem

The exposure uniformity of photographed and processed images is very important, which directly affects the work efficiency and processing quality of subsequent processing, and ordinary digital cameras will have different degrees of "vignetting" problems due to the characteristics of the lens, resulting in text, graphics, etc. When documenting, the background color of the "vignetting" position in the surrounding "vignetting" position in the document is too dark due to underexposure, and the contrast between the writing of the text or the lines of the graph and the background is too small, and in severe cases, it is mixed with the background One; in the center of the image, due to overexposure, the color of the writing or the lines of the graphics in the center is too light, and the contrast with the background is too small. In severe cases, the writing or lines appear "broken lines"

The color of light-colored handwriting or lines in the center is mixed with the background color of the "dark corner", which makes it difficult for the computer to perform batch processing, greatly reduces the efficiency of image processing, and the quality of processing is difficult to meet the requirements

Although high-performance digital cameras or lenses can be used to solve the "vignetting" problem, it will greatly increase the cost

[0005] 3. Lighting problems

However, the usual photo processing only simply configures several light sources for supplementary light, and it is difficult to accurately configure the lighting source according to the characteristics of the camera and lens.

Not only the illuminance is greatly affected by the environment, but it will even aggravate the "vignetting" of the photographed image

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