Digital Camera CCD Dead Pixels Test Experience
Because direct observation through the LCD screen can not be directly observed dead pixels on the CCD, we must use other means of observation. Specific method is to use the black map into the computer to detect the dead pixels. Of course, this is pay attention to details, because the digital camera this thing is very delicate. In different situations may differ materially from the results of the test, so a good grasp of details. When purchased in the market generally, businesses do not provide computer dead pixel test, it is recommended to bring your own laptop notebook users. For non-laptop users should be agreed in writing with the digital camera business, and returned the test period, so it will not buy in the digital camera at a disadvantage.
Dead pixels in the test when the noise
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interference is the biggest, so try to avoid this interference. When the general noise machine just getting less noise power over a period of time the number began to climb. The author’s experience is when the camera is about 10 minutes to stabilize the number of noise. If you want to test whether there is dead pixels, then they would take pictures while the boot time; if you want to test a digital CCD camera, the overall performance, it was later photographed until stability test. When the picture was taken in black and cover the lens or the lens shading down
Here we take as a model for high-end Digital Cameras, digital home can save some steps accordingly. First of all, completely shading the Camera Lens (you can also operate in the darkroom), open a digital camera, the aperture is set to the minimum to maximum speed (ISO100 or lower), is set to
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TIFF image storage format, and the highest quality, maximum resolution Then adjust the noise reduction function to the bottom (can be turned off, turn off), color saturation is set to a minimum, continuous, and anti-shake turned off, the picture dates canceled. After doing the above work, it is best to wait a little, let the machine to fully warm up and in the normal use state.
The next step is taken with different shutter, which, as the actual delivery of the camera shutter options may be. Generally recommended 1 / 60, the fastest, the slowest shutter three pictures on it. Of course, you have enough time to have all of the shutter to take a corresponding black map. In particular, note that if you are shooting in the dark room, remember not to use flash! Sample and the parameters of the local black figure, click to enlarge full size observed
In such
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multiple images obtained after the next step is to observe the input into the computer. To observe with the naked eye a little light in the darkness really difficult, we are most familiar to borrow a digital player software DeadPixelTest to do testing. DeadPixelTest, designed in 2001, the software can very easily help us find where the defect image, but many argue there is not at the point, but rather the software to set up! The default setting in the two settings using 60-250. Professional recommended setting the camera to the right in the 5-20, 40-50 home camera is recommended that the appropriate (as this is not an authority to set standards and say, we can only as a reference, but the 60-250 is still the default value is indeed returned reference to the basis for many manufacturers). Through multiple images of the test, if in a different picture, the same coordinates the appearance of bright spots is not an exception, then you can determine that it is dead pixels. However, some camera noise reduction can not be canceled, and the shutter speed is greater than 1.3 seconds in the time automatically, so these cameras more than 1 second exposure image does not have a reference value. Such a digital camera is the most reliable reference to 1 / 60 seconds (the most common everyday camera shutter) of the dark figure, observed a dark figure under the shutter if there dead pixels. Black figure used for testing, where bright spots can be analyzed immediately
The
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black figure with the reference must be multiple, single data generally does not make sense. In this, the author also reminds the digital player, do not blindly trust the results of the software. It only as a reference, sometimes the software is also above the dead pixels are classified as noise. The real benchmark is shooting through the real, obvious point representation was dead pixels. Software is designed to help us find the man dead pixels, save manpower, not everything!
In addition to the default value of the problem, which the software is still some design flaws, it can only display up to the coordinates of 100 points, the excess can not be displayed. But this flaw is understandable, after all, the total number of noise and bad points to more than 100 digital camera has a poor quality product. The software used for testing only bright spot for the dark spots on the powerless. Although the probability is very low dark spots appear, but also a kind of dead pixels in the color of vivid colors in the picture is manifested more clearly. For the “dark point” method commonly used to capture the White test. Specific process with the above “highlights” similar. But this time to find the dark spot from the image, and no relevant support software.
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Dead pixels digital camera appearance is far greater than the probability for the highlight of dark spots, so often this step can be ignored.
I also heard that there is a “DCD” software, you can enter some special by photographs of ordinary life do not change with the shutter and the sensitive points. By which software can be more accurate to find dead pixels on the CCD. This test method has the advantage of the naked eye can be difficult to identify the dark to identify dead pixels. But I think hard, he just did not find this software, so not to make rash conclusions! Also want to have this section which
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software users to share software.
Digital Photography 1 on 1: Episode 67: Lighting for Black and White Photography
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