Author Topic: Minolta Dimage X researches and tests  (Read 4277 times)

Offline elevenaugust

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Minolta Dimage X researches and tests
« on: July 25, 2008, 05:53:13 pm »
Here's the reference photograph, taken by a Minolta Dimage X by Numbers:

Original file here

The tests will be as complete as possible and will use these tools:
  • Adobe Photoshop Elements 6.0
  • Dimage Viewer 1.0.1
  • Flickr
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Offline elevenaugust

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Re: Minolta Dimage X researches and tests
« Reply #1 on: July 25, 2008, 07:17:18 pm »
Adobe Photoshop elements
1- Export as a new file:
-Original format:
Removed datas:
EXIF file "User comment"
Added datas:
None
Modified datas:
"Thumbnail offset" from 4096 to 1386
"File size" from 703kb to 699 kb

-JPEG format original size quality max (12)
Same modifications as above.

-JPEG format original size medium quality (6)
Removed datas:
EXIF file "Orientation"
EXIF file "User Comment"
Added datas:
None
Modified datas:
"Thumbnail offset" from 4096 to 1386
"File size" from 703kb to 113kb
"X Resolution" from 72 to 300
"Y Resolution" from 72 to 300
"Software" to V100-02 to Adobe Photoshop Elements 6.0
"Thumbnail Lengh" from 3518 to 4368
"YCbCr Sub Sampling" from YCbCr4:2:2 (2 1) to YCbCr4:2:0 (2 2)

-JPEG format original size poor quality (0)
Removed datas:
EXIF file "Orientation"
EXIF file "User Comment"
Added datas:
None
Modified datas:
"Thumbnail offset" from 4096 to 1386
"File size" from 703kb to 45kb
"X Resolution" from 72 to 300
"Y Resolution" from 72 to 300
"Software" to V100-02 to Adobe Photoshop Elements 6.0
"Thumbnail Lengh" from 3518 to 4368
"YCbCr Sub Sampling" from YCbCr4:2:2 (2 1) to YCbCr4:2:0 (2 2)

Resizing to 1024*768 gives the same kind of results.
Note also the change to the name of the file from xxxx.JPG to xxxx.jpg.
« Last Edit: July 25, 2008, 07:25:44 pm by elevenaugust »
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Offline elevenaugust

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Re: Minolta Dimage X researches and tests
« Reply #2 on: July 25, 2008, 07:52:50 pm »
-Set date and hour:
XMP datas added.

-Automatic levels, colours, contrast, clearness:
No modifications.

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Offline elevenaugust

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Re: Minolta Dimage X researches and tests
« Reply #3 on: December 21, 2008, 01:32:30 am »
Here's a technical article on how the Minolta DimageX works:

"Sporting an extraordinarily thin body style for a 3X optical zoom digital camera, the Minolta Dimage X uses a vertically-oriented lens train and a right-angle mirror to bury the size of thickness-killing optics inside the case. Light entering at top of the camera is directed by a prism downward through the lens system to the CCD sensor at the bottom, allowing the camera profile to remain at a slim 21mm even when the camera is on and optics are in motion.

Implementation of the unconventional design relies on the usual digital processing and storage but starts with analog technology. A 2-megapixel CCD from Sony (#ICX284AK) captures the image in analog form, and because of space constraints, the CCD is the lone electronic component married to the lens. To insure signal fidelity between sensor and the main board which holds the analog front end, an amazing array of miniature coax cables shield signals line-by-line to keep noise at bay on the low-level CCD signals. About a quarter of the camera volume is occupied by the optics and coaxial cables connecting the CCD Sensor Board to a second small board that plugs into the Main Board.

Once CCD signals arrive at the main board, an Analog Devices analog front end chip (#AD9848) performs 10-bit A/D conversion along with gain (exposure) control, noise reduction, and signal readout timing. A Sony CXD3400N also supports CCD clocking functions. After signal conditioning and digitization, raw image data is processed in a Sanyo DSP, which is supported by a Fujitsu SPARClite microprocessor and Hitachi SDRAM. A 2MB Fujitsu flash memory (#MBM29LV160TE90) holds system operating code. The 1.5-inch color TFT LCD monitor is interfaced to the system via a Sanyo #LV4137 LCD Display Driver and Rohm's #BH6406FV provides support for analog audio input/output.

Returning to the optics, several functions must be performed to manage the lens train and optical exposure. A Sanyo #LB8649 and Rohm #BA6238AN provide drive voltages and analog smarts to deal with zoom motor, focus motor, and aperture (iris) voice-coil elements embedded within the up-ended optics assembly.




Estimated Cost-of-Goods-Sold (COGS) for the Dimage X is less than half of the $399 price. Electronics integration continues to reduce camera form-factor and cost though a clear partitioning of digital and analog functions suggests little technical or economic benefit from combining disparate functions into a common IC process. Sometimes the road less-integrated provides an optimum balance of function, design risk, and cost, particularly when it comes to mixed-signal systems.

SOURCE
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Offline Nemo492

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Re: Minolta Dimage X researches and tests
« Reply #4 on: December 21, 2008, 01:54:36 am »
Thanks 11, you gave me a clue to get one
for 30 euros. I think the deal is on its way.
http://ovnis-usa.com
The only motivation for the DRT is finding the truth.

Offline 10538

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Re: Minolta Dimage X researches and tests
« Reply #5 on: December 21, 2008, 07:01:18 pm »
The purchase of the Dimage Xi may not be a total loss.  The Xi has the same exif version and endian type as Raj's late model X.  We should check it out.