White-light Processing Technique Research Articles

Progress report on archival storage of color films utilizing a white-light processing technique

The authors report a spatial encoding technique such that the moire fringe pattern inherently existing with the retrieved image can be avoided. To improve the diffraction efficiency of the film, they have introduced a bleaching process so that the step of obtaining a positive encoded transparency can be eliminated. Instead of restricting the encoding processing to the linear region of the T-E curve, they allow encoding in the linear region of the D-E curve, so that a broader range of encoding exposure can be utilized. Experimental results indicate that excellent color fidelity, high signal to noise ratio, and good resolution of the reproduced color images can be obtained.

Broad spectral band color image deblurring

A broadband white-light processing technique for smeared color photographic image deblurring is described. The technique utilizes a diffraction grating method to disperse the smeared image spectra in the Fourier plane so that the entire spectral band of the white-light source can be utilized for the deblurring. In this paper the technique of synthesizing a fan-shape type complex deblurring filter to accommodate wavelength variation is presented. Experimental results showed that this broad spectral band processing technique offers an excellent coherent artifact noise suppression, and the technique is particularly suitable for color image deblurring. Experimental demonstrations and comparisons with the narrowband and coherent deblurring are also provided.

Color photographic-image deblurring utilizing white-light processing technique

A white-light processing technique for smeared color photographic image deblurring is described. A simple technique of synthesizing complex spatial filters for color image deblurring is also given. An experimental demonstration of smeared color image deblurring with white-light processing technique is provided. Since the white-light source contains all the visible wavelength of the electromagnetic wave, it is particularly suitable for color image processing. The authors also note that the white-light processing technique is simple and economical to operate and it offers the advantage of artifact noise suppression.

Color encoding of holographic interferometric fringe patterns with white-light processing

A technique is presented for color encoding holographic interferometric fringe patterns using an extended white-light source. The color encoding is performed on the smeared Fourier spectra which are derived from an on-focus multiplexed interferometric hologram. This color encoding technique offers the advantages of direct comparison of different fringe patterns which can also be transmitted for direct color monitor display and storage. This white-light processing technique is capable of performing complex spatial filtering for fringe pattern recognition and identification. This technique is simple, versatile, and can be performed using coherent, partially coherent, or white light.

COLOR RESTORATION OF FADED COLOR FILMS WITH WHITE-LIGHT PROCESSING

A technique of color restoration for faded color films with whitelight optical processing is presented. The color restoration can be accomplished with spatial encoding and color filtering. Although the technique offers an advantage of faded color encoding, however, it is not a real-time technique. We have also presented a real-time color restoration with white-light optical processing technique. Experimental demonstrations of this color restoration technique are also included. We have shown that the white-light color restoration is a simple, versatile and economical technique. The white-light processing technique also offers the advantage of direct viewing capability, which is very suitable for instantaneous color restoration and enhancement applications.

White light processing technique for archival storage of color films

The method of archival storage of color films utilizing a spatial color encoding process and a white light color image retrieval technique is described. This archival technique offers several advantages as compared with all the other existing archival techniques: It employs a white light source for the encoding and decoding processes, so that the coherent artifact noise can be avoided. Since the technique does not utilize a slit aperture and a narrow spatial filter, the reproduced color image causes no marginal loss in resolution. The storage volume by this technique is also reduced to one-third of that needed with the traditional technique. This technique offers the advantage of direct viewing, which may be important for library applications. We also stress that this archival storage technique is simple and economical to implement. A simple experimental demonstration is also presented.