User talk:Jbergquist

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I noticed you were new, and wanted to share some links I thought useful:

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User:Sam Spade

[edit] George Clarke Chandler, Pat Burns, etc.

Hi...please don't apply Category:People from Canada in broadcasting to individual articles; they should be filed only in the appropriate subcategory (Category:Canadian television personalities, Category:Canadian radio personalities, etc.) The "people in broadcasting" category is meant only as a parent for the subcategories; it's not supposed to contain any individual articles. Thanks. Bearcat 06:28, 20 September 2006 (UTC)

Thanks for the info. The categories you mentioned are an improvement. --Jbergquist 09:38, 21 September 2006 (UTC)

[edit] Victoria (crater) anaglyphs

I have removed the Victoria Crater anaglyphs from Opportunity rover because they could be made into one image using a tool similar to AutoStitch. Feel free to replace it with a stitched version. If you do replace the image, please tag the old images with {{db-g7}} so that they may be deleted. And by the way, the article for Victoria is here. (I have blanked the OrphanBot notice because you addressed the concerns raised). Happy editing! MER-C 06:42, 30 September 2006 (UTC)

One more thing, it's a good opportunity (no pun intended) to spam the Martian geography WikiProject. Happy editing! MER-C 06:49, 30 September 2006 (UTC)

I think the way to do it would be to stitch the all the L7s and all the R1s (so that you have two images), then make an anaglyph of the two images. Don't blame me if it goes wrong, because I'm too busy tagging stuff for deletion. MER-C 09:35, 30 September 2006 (UTC)

What is probably needed is an image editor for stitching anaglyphs which are not regular B&W or color images. There is more involved than just projecting pixels onto a sphere to create a panorama. The value of an anaglyph is its 3D content since there are two points of view, one for each eye. An additional complication is that the images have to be adjusted for the rotation of the head with apparent viewing angle. The B&W images and variations in lighting probably also contributed to making it difficult to achieve a match. As for me, I was just submitting a story. It is today's news. My contribution was the creation of the anaglyph and adjusting the plane of focus for the viewer. JPL's anaglyphs merge at infinity which makes viewing close-up difficult. Wiki has the right to enforce an editorial policy and content covers such matters as image size and the allocation of resources. But I think that editorial license would include the creation of anaglyphs from the raw images and making the adjustments which I did. The same thing could be done with an anaglyph that JPL produced to make it easier for a person to view and this was the motivating factor in the creation of the program that I used. The real story is what JPL and the scientific community is doing and I would prefer not to detract from that. So I choose to defer to Wiki on the removal. --Jbergquist 15:07, 30 September 2006 (UTC)

I just noticed the typo that I made on the image file names. Haste makes waste. I'll tag the anaglyphs for deletion. The panorama of Victoria (crater) from Wikimedia Commons was posted prior to the anaglyphs. --Jbergquist 20:42, 30 September 2006 (UTC)

The images which were removed but with corrected names. Click on an anaglyph to enlarge it. Standard red-blue glasses are needed to view them as intended.

The total number of pixels in all seven anaglyphs is just slightly larger than that in the largest versions of the NASA/JPL panoramic anaglyphs mentioned on the image pages. --Jbergquist 01:23, 1 October 2006 (UTC)

I guess some of these pictures could be useful for illustrating specific features of Victoria, such as Cape Verde and the other cape (name doesn't come to me). But for a general view of Victoria, something like the anaglyphs here would be more appropriate than 7 separate images. MER-C 07:28, 1 October 2006 (UTC)

Every anaglyph has a vertical line of "focus". With changes in distance in the scene this might be reduced to a single point of focus. In the anaglyph here[1] the focus seems to be on the precipice at the left. As one looks to the right, the alignment of the separate red and blue images gets increasingly worse. One can combine a set of images into a panorama by mapping them onto a sphere. But this only contains the angular information in a scene. Depth perception is lost in the process. Anaglyphs preserve the radial information along the line of sight. The two processes are complementary and neither view is complete in itself. If one tries to produce a panoramic anaglyph, one encounters a problem with the sides. Trying to reduce the problem by decreasing the separation with increasing angle also alters the perception of depth at the same time. The only way to preserve a scene is to make a series of anaglyphs. A three dimensional scene could be divided up into a set of views like the faces of a regular polyhedron. With enough overlap one could do panoramas. With two distinct images for each face, the perspective information is preserved. The number of images required to complete the scene depends on the field of view of the camera used. With a 24 degree field of view at least 15 images would be required for a 360 degree panorama and more would be needed if overlap is required to piece the scene together. One would need an adaptive viewer to shift the original images relative to each other in order to bring a particular point into focus. Such a viewer is not generally available at this time. The best that we can do in the way of public service is to publish a series of separate images. --Jbergquist 19:01, 2 October 2006 (UTC)

Here is a good article on VR and Planetary Exploration. --Jbergquist 19:00, 3 October 2006 (UTC)

Found a permanent home for one of your anaglyphs. MER-C 02:27, 5 October 2006 (UTC)