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Topic: Demosaicing

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	Digital Camera Demosaicing (Site not responding. Last check: 2007-10-18)
		The point here is that processing both before and after the demosaicing stage has a great effect on the actual values being processed in that stage, and in particular, the accuracy of an experiment where only data at the ends of the pipeline is available.
		I therefore posit that the blurring which occurs before the demosaicing is sufficient to erase artifacts due to this target mosaic.
		Interpolation with a kernel of this small size during the demosaicing stage would produce noticeable aliasing of these single scanlines, but as we can see, it is white within the bounds of the measured noise.
	ise.stanford.edu /class/psych221/projects/98/demosaic/kodak (2673 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		In accordance with another embodiment of the present invention, a demosaicing method is provided in which a mosaiced image is received in a plurality of colors and separated into a plurality of single color images.
		After demosaicing processing at step 74, the output is subjected to image processing 76, which includes a series of conventional image processing steps, including white balancing and compression.
		The demosaicing method in a digital camera as claimed in claim 9 including a step of: flipping the output of the B color plane filtration twice after the vertical direction filtration.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/26359.010412&ELEMENT_SET=DECL (4552 words)

	Film vs Digital (Site not responding. Last check: 2007-10-18)
		Demosaicing is a form of interpolation that uses color information from neighboring sensor receptors to supplement the color information at a receptor being processed into a pixel.
		Demosaicing algorithms may also be designed to further increase the apparent resolution by using two sensors to produce three image pixels.
		All too often, the term demosaic is used to encompass two or even all three of the steps.
	www.rags-int-inc.com /PhotoTechStuff/DigitalFilm (5150 words)

	Image demosaicing method utilizing directional smoothing - US Patent 6404918 (Site not responding. Last check: 2007-10-18)
		To produce a true color image, with a full set of color samples (usually red, green and blue) at each sampling location, a substantial amount of computation is required to estimate the missing information, since only a single color was originally sensed at each location in the array.
		3 is flow chart of the preferred embodiment of a demosaicing method according to the present invention.
		3 which is a block diagram of the preferred embodiment of a demosaicing method according to the present invention.
	www.patentstorm.us /patents/6404918.html (3995 words)

	[No title]
		This color plane interpolation is known as demosaicing; it is one of the important tasks in a di...
		The algorithm has applications in demosaicing digital camera CFA data, and processing other imaging modalities such as scanned images and captured video.
		In order to reconstruct the original full-color image, a demosaicing step must be performed which interpolates the missing colors at each pixel.
	library.graphicon.ru:8080 /catalog?prop_id=295&limit_start_row=0&limit_step=10 (689 words)

	This Week's Colloquium
		Adaptive Homogeneity-Directed Demosaicing Algorithm Most cost-effective digital cameras use a single image sensor, applying alternating patterns of red, green, and blue color filters to each pixel location.
		This paper presents three inherent problems often associated with demosaicing algorithms that incorporate directional interpolation: misguidance color artifacts, interpolation color artifacts, and aliasing.
		The proposed demosaicing algorithm estimates missing pixels by interpolating in the direction with fewer color artifacts.
	www.mail-archive.com /colloquium@cs.orst.edu/msg00013.html (215 words)

	Pixel Grouping for Color Filter Array Demosaicing
		This paper describes a new color filter array demosaicing algorithm that makes use of some properties of natural scene images to reduce some of the common artifacts introduced by the demosaicing process.
		Lots of people had previously worked on color filter array demosaicing algorithms, and it is only by building on their results that enabled me to come up with something even better.
		Jeremy Rosenberger's ImageCooker is used extensively during the development of this algorithm; even though it is a little bit weak on the documentation side, his well written and well structured code makes it possible to build the reference implementation to work on within such a short time frame.
	www.cs.pdx.edu /~cklin/demosaic (1423 words)

	IVRG - Image and Visual Representation Group (Site not responding. Last check: 2007-10-18)
		It is possible to design a demosaicing algorithm by selecting frequencies corresponding to luminance and opponent chromatic signals.
		For classical demosaicing algorithms, the two most visible effects are blurring and false color.
		Having a larger correlation between the color channels increases the quality of reconstruction (in the extreme, the three filters are equal, resulting in a greyscale image), but decreases the color rendering ability [4].
	ivrgwww.epfl.ch /index.php?name=Demosaicing (805 words)

	Tutorials - The RAW File Format
		The image is then sharpened to offset the softening caused by demosaicing, which is visible in the second image.
		Demosaicing is a very processor-intensive step, and so the best demosaicing algorithms require more processing power than is practical within today's digital cameras.
		Performing the demosaicing step on a personal computer allows for the best algorithms since a PC has many times more processing power than a typical digital camera.
	www.cambridgeincolour.com /tutorials/RAW-file-format.htm (1579 words)

	Rice U - ECE Colloquium Series (Site not responding. Last check: 2007-10-18)
		Research problems in the areas of color filter design, denoising, demosaicing, and digital zoom are discussed and suggestions are made for possible new solutions.
		Demosaicing is the problem arising from the use of color filter arrays which only allow one color per sensor element.
		An efficient algorithm for demosaicing is presented which uses directional interpolation and filter bank alias canceling ideas to reduce color artifacts.
	www-ece.rice.edu /ece/colloq/02-03/Feb13-03.html (264 words)

	[No title]
		This color plane interpolation is known as demosaicing; it is one of the important tasks in a digital camera pipeline.
		If demosaicing is not performed appropriately, images suffer from highly visible color artifacts.
		We have compared this technique with six state-of-the-art demosaicing techniques, and it outperforms all of them, both visually and in terms of mean square error.
	fens.sabanciuniv.edu /telecom/eng/seminars/seminar3_altunbasak.htm (381 words)

	Can demosaicing be reversed? (Digital camera) - Science Forums and Debate
		If demosaicing is a reversable process, then I guess it can be done.
		Demosaicing (as I understand it) extrapolates information from an image to contruct a new image with more information (particularly the RGB info.
		Look at the demosaicing algorithms and determine whether they are reversible.
	www.scienceforums.net /forums/showthread.php?t=5588 (311 words)

	IVRG - Image and Visual Representation Group (Site not responding. Last check: 2007-10-18)
		This model shows that visual artifacts after demosaicing are due to aliasing between luminance and chrominance and could be solved using a pre-processing filter.
		For demosaicing by frequency selection, we use for all images the Filter given in Figure 4 (a).
		Table 1: Comparison of CPSNR obtained with the Bayer CFA, a modified Bayer CFA where the red and green pixels are exchanged, and a CFA where the blue and green pixels are exchanged.
	ivrgwww.epfl.ch /index.php?name=IEEE_Demosaicing (690 words)

	Demosaicing (Site not responding. Last check: 2007-10-18)
		Methods for interpolating the missing sensor values are referred to as “demosaicing”.
		In the last ten years, demosaicing has become one of the most popular image processing exercises in digital signal processing.
		There are two more distinctions to make between demosaicing algorithms.
	www.imageval.com /ISET_Manual/Demosaicing.htm (425 words)

	Image-Processing Pipelines in a Digital Camera - Jong B. Park, Stanford University (Site not responding. Last check: 2007-10-18)
		This report provides intuitive understandings on the design and trade-offs of spatial demosaicing and color correction (or color balancing) techniques, and their effect on the final image quality.
		Most non-adaptive demosaicing methods for RGB Bayer pattern are equivalent to using low-pass filters that has effectively low cut-off frequencies.
		Adaptive method, which uses local spatial information to decide different demosaicing algorithms, is equivalent to using different-sized convolution kernels of low-pass filters at different spatial locations, namely, adaptive filtering.
	www-mrsrl.stanford.edu /~piquant/ee362project (2173 words)

	High-End Demosaicing Algorithm (CFA interpolator) for Digital RAW photo files (Site not responding. Last check: 2007-10-18)
		Demosaicing is a process to convert a single sensor CCD/CMOS data to a color image.
		It mainly uses a demosaic algorithm called VNG (variable number of gradients).
		This algorithm is considered a high-end demosaicing algorithm.
	home.earthlink.net /~paul.j.lee (371 words)

	How Digital Cameras Work by Thom Hogan
		One of those artifacts associated with sampling frequency and demosaicing is that of moire patterns (sometimes called color noise).
		They claim that, because of the angular nature of their array (think of a baseball diamond where each of the bases is a photosite), that they already have the X and Y values that can be used to build the intermediaries (the pitcher's mound in this pattern).
		This means that you sample existing data to produce additional data (that's what demosaicing does, for example: you have a G value and you look at the other data around it to come up with the R and B values for that G position).
	www.bythom.com /ccds.htm (4005 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		Demosaicing is a technique to reconstruct the low resolution image from image detector to the high resolution one.
		In this project we studied and implemented four prevailing demosaicing algorithms.
		We also implemented the bilinear interpolation, a straightforward demosaicing algorithm, to help evaluate the performance of the new algorithms.
	www-ise.stanford.edu /class/psych221/projects/05/yychang/Introduction.html (144 words)

	creativepro.com - Framed and Exposed: Making Sense of Camera Sensors (Site not responding. Last check: 2007-10-18)
		To get from a bunch of red, green, and blue pixels to a final full-color image, your camera employs an interpolation process called "demosaicing." The final color of each pixel is calculated by analyzing the colors of all of the surrounding pixels.
		Because demosaicing is such a gnarly process, camera makers routinely employ different techniques to try to improve color fidelity, and to reduce Bayer interpolation artifacts, which can sometimes appear in the final image.
		After demosaicing, your camera performs a number of adjustments to the image data.
	www.creativepro.com /story/feature/21600.html?cprose=daily (1952 words)

	do you know an application to simple edge detection for image blocks? (Site not responding. Last check: 2007-10-18)
		That is, I = came up with many, many, cool ways to do demosaicing (including edge cases), = but the one we ended up usinig was the one that had the "best" = results/computation-time (given the processor we were using, which we would = not change) tradeoff, according the marketing and the customers.
		That is, I came up with many, many, cool ways to do demosaicing (including edge cases), but the one we ended up usinig was the one that had the "best" results/computation-time (given the processor we were using, which we would not change) tradeoff, according the marketing and the customers.
		Hello Joenyim Kim, Some demosaicing algos use edge detection to guide their interpolation.You could look into these to see if what you have can be useful here.
	www.forum-one.org /new-409125-4337.html (3760 words)

	camerahacking :: View topic - PV Camera Hacking Glossary (Site not responding. Last check: 2007-10-18)
		Demosaicing - Algorithm to "reassemble" a Bayer-filtered color array into an image with all RGB values at each pixel.
		Demosaicing algorithms can be quick with various chromatic errors or lengthy with better chromatic correction.
		When pixels in a demosaic-ed image that should be white are colored then this is an error or limitation in the demosaicing algorithm.
	camerahacks.10.forumer.com /viewtopic.php?t=267 (1187 words)

	Perceptual Assessment of Demosaicing Algorithm Performance (ResearchIndex) (Site not responding. Last check: 2007-10-18)
		In the first experiment, we found that a Bayesian demosaicing algorithm produced the most preferred images.
		Detailed examination of the data, however, indicated that the good performance of this algorithm was at least in part due to the fact that it sharpened the images while it demosaiced them.
		1 Demosaicing using human visual properties and wavelet interp..
	citeseer.ist.psu.edu /610239.html (403 words)

	Tutorials - Digital Camera Sensors
		Bayer "demosaicing" is the process of translating this Bayer array of primary colors into a final image which contains full color information at each pixel.
		This is no problem, since information at the very edges of an image can easily be cropped out for cameras with millions of pixels.
		Other demosaicing algorithms exist which can extract slightly more resolution, produce images which are less noisy, or adapt to best approximate the image at each location.
	www.cambridgeincolour.com /tutorials/sensors.htm (934 words)

	Bayer CFA reconstruction
		On this page you can find a few examples of the effect that Bayer CFA demosaicing has on image resolution.
		Demosaiced Luminance resolution is slightly (6.4%) reduced (mostly in the diagonal direction), but still very close to the original resolution.
		The solution against color fringing is to slightly pre-blur the highest spatial frequencies, allowing some of the missing pixel (luminance and color) information to be also registered in the neighboring pixels.
	www.xs4all.nl /~bvdwolf/main/foto/bayer/bayer_cfa.htm (1186 words)

	Accurate Color Demosaicing ins... - Infoscience (Site not responding. Last check: 2007-10-18)
		This model shows that visual artifacts after demosaicing are due to aliasing between luminance and chrominance and can be solved using a pre-processing filter.
		This approach gives new insights for the representation of one-color per spatial location images and enables formal and controllable procedures to design cameras with aliasing-free properties.
		The demosaicing algorithm we propose based on this model also performs well compared to concurrent approaches, as demonstrated by experiments.
	infoscience.epfl.ch /search.py?recid=52508&ln=en (209 words)

	HP Hong Kong - Digital Photography - HP Real Life technologies: HP Adaptive Demosaic
		Digital cameras capture light by using an image sensor which is physically divided into light-sensitive areas called pixels.
		A mosaiced sensor is physically smaller and much less expensive than using 3 complete sets of sensors to record all the colour information in a scene.
		Once the mosaiced image is recorded by the camera, a "demosaic" algorithm is used to fill-in the missing 2/3 of the colour information.
	h50019.www5.hp.com /eng/reallife_demosaic.asp (178 words)

	Multi-Frame Demosaicing and Super-Resolution from (ResearchIndex) (Site not responding. Last check: 2007-10-18)
		Abstract: In the last two decades, two related categories of problems have been studied independently in the image restoration literature: super-resolution and demosaicing.
		A closer look at these problems reveals the relation between them, and as conventional color digital cameras su#er from both low-spatial resolution and color filtering, it is reasonable to address them in a unified context.
		In this paper, we propose a fast and robust hybrid method of super-resolution and demosaicing, based on a...
	citeseer.ist.psu.edu /646985.html (443 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		Most cost-effective digital cameras use a single image sensor, applying alternating patterns of red, green, and blue color filters to each pixel location.
		This paper identifies three inherent problems often associated with directional interpolation approaches to demosaicing algorithms: misguidance color artifacts, interpolation color artifacts, and aliasing.
		The severity of misguidance color artifacts present in two images can be compared using metric neighborhood modeling.
	216.104.181.39 /cd/icip/html/abstract/a1545.htm (127 words)

	An improved image processing chain (Site not responding. Last check: 2007-10-18)
		A resource demanding operation that is common for cameras with CCD or CMOS sensors, the demosaicing operation, becomes obsolete as the captured image is a fullcolor RGB and need no interpolating.
		The task of the demosaicing operation is to transfer an image from Bayer RGB to RGB by interpolating the three subsampled colors red, green and blue as shown in Figure 6.
		Note that the demosaicing operation actually is moved from the compression side of the image processing chain to the decompression side, it is not totally left out.
	student.grm.hia.no /master/ikt02/ikt6400/g23/Report.htm (7557 words)

	Image demosaicing method utilizing directional smoothing - US Patent 6618503 (Site not responding. Last check: 2007-10-18)
		The method of claim 5, wherein chrominance components of the new image are smoothed by isotropic filtering.
		A method of demosaicing a digital image, each pixel of the digital providing less than full color information, the method comprising:
		These and other objects of the present invention will become apparent to those skilled in the art from the following detailed description of the invention and the accompanying drawings.
	www.patentstorm.us /patents/6618503.html (3776 words)

	Demosaicing of Color Images Using Steerable Wavelets - Hel-Or, Keren (ResearchIndex) (Site not responding. Last check: 2007-10-18)
		Demosaicing of Color Images Using Steerable Wavelets (1997)
		The reconstruction of the three color values for each pixel is known as the "demosaicing" problem.
		Yacov Hel-Or and Daniel Keren, Demosaicing of color images using steerable wavelets, Tech.
	citeseer.ist.psu.edu /hel-or97demosaicing.html (586 words)

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