Is the usage rate of CCD always 100 for digital cameras?

I think it's all used, but the prime of ** is different, and the space utilization rate is also smaller.

1. To be precise, it is 100% used, because what do you have to do? In fact, it should be almost 100% used, and in fact, the pixels around the CCD are corrections to the adjacent pixels, so there are total pixels and effective pixels.

In addition, when the 800W pixel is set to 400W pixels, all CCD areas must be used, first, if not, there must be relevant instructions; Second, this is not actually a problem, and if you don't use it, wouldn't such an important object be wasted?

400W is all CCD, 800W is compressed to 400W

1. CCD camera is a kind of digital camera;

2. The imaging hardware of digital cameras is sensors, lenses and image processors. Among them, there are three main types of sensors: CCD, CMOS and MOS;

3. The advantage of CCD sensor is that the ability to identify wavelength is stronger, and the camera has better color recognition; The CMOS sensor is better at guessing the dynamic range and signal-to-noise ratio; MOS sensors are somewhere between CCD and CMOS. In a good illumination environment, the imaging quality of CCD will be better.

4. The manufacturing process of CCD sensor is very demanding, and the factory yield rate is relatively low, for example, a pixel (a pixel and a photodiode) is damaged, which will cause all the pixels in the whole line to be damaged and the sensor to be scrapped, while a pixel of the CMOS sensor is damaged, as long as the pixel is shielded, it will not affect the imaging. Therefore, there are very few manufacturers that develop CCDs, the mainstream sensor is CMOS, and the strongest civilian CMOS technology is Sony;

5. CCD cameras are not so cheap, and now some medium format cameras still use CCD sensors, which are very expensive, but the future trend is that all home cameras may eliminate CCD sensors, and only in the field of national defense science and technology such as astronomy, CCD sensors are still used;

6. The CCD digital cameras that the landlord said are mostly some older digital cameras, and there are no accessories to replace them after they are damaged, especially the sensor cannot be replaced, so it is very cheap, and these are the tail goods of the products, and the tail goods clearance will not be there anymore.

Generally speaking, the larger the CCD size, the better the latitude, the better the dynamic range, the less noise, the more advantageous it is when shooting night scenes, and the higher the ISO sensitivity when capturing dynamic scenes. However, the flickering aperture does not necessarily require a large CCD size to be good, if it is a general shooting, it is useless to have a smaller CCD size, just like the Canon A400, its CCD size is 1. The results are still quite good during the day, even in night scenes, which can be shot with a lower resolution, and the effect is not much worse due to the composition of pixels.

Even with a large CCD, there is still a lot of noise, and I don't think the size of the CCD has as much influence on the final image as people think. Therefore, when purchasing a machine, the CCD size can be completely unconsidered, even if it is to be considered, if it can be above 1, it will be fine.

When the CCD size is the same, you should choose a machine with a low resolution. The fewer pixels, the larger the photosensitive area of each pixel and the better the performance, which is simply a free gain. (Flash the aperture and shoot high:.)

The choice of digital camera does not mean that the higher the pixel, the better, the improvement of the pixel and the size of the sensor should also be improved, otherwise the image quality will be reduced, the choice of pixels should not be superstitious high pixels must be good, many times if you only usually judge the shooting** has a 5 million pixels is enough for you to save and produce the film, spend money on buying high pixels is not as good as around the camera, such as tripods, memory cards. ）

When it comes to the size of the CCD, it is actually the area size of the image sensor, which includes the CCD and CMOS. The larger the area of the sensor, that is, the larger the area of the CCD CMOS, the more photons are captured, the better the light sensitivity and the lower the signal-to-noise ratio. CCD CMOS is a component used in digital cameras to sensitize images, which is equivalent to the film in optical conventional cameras.

The larger the CCD CMOS size, the larger the photosensitive area, and the better the imaging effect. A 1-inch 3-megapixel camera usually performs better than a 1-inch 4-megapixel camera (which has only 55% of the photo-sensitive area). The increase in CCD CMOS pixels of the same size is a good thing, but it will also lead to a reduction in the photosensitive area of a single pixel, which may be insufficient.

However, if you want to increase the number of CCD CMOS pixels while maintaining the existing image quality, it is necessary to increase the total area of the CCD CMOS while maintaining at least a single pixel area. At present, it is difficult to manufacture larger CCD CMOS, and the cost is also very high. As a result, digital cameras with a larger CCD CMOS size** are also higher.

The size of the sensor directly affects the volume and weight of a digital camera. Ultra-thin and ultra-light digital cameras generally have a small CCD CMOS size, and the more professional the digital camera, the larger the CCD CMOS size.

e.g. 1 inch) indicates the diagonal length, and of course the size is approximately better.

CCD is the photosensitive electronic component of the camera, and its size is only related to the size of the photo format, not the image quality.

CCD is the image sensor.

Let's take an analogy.

The human eye is a shouting machine.

The lens is the lens.

The retina is CCD

The size of the CCD stool banquet has 1

and so on.

CCD has been developed for more than 20 years, and has been quite proficient in the development of current product technology, with high sensitivity, even if the light is insufficient, it will not be too dark, and the high sharpness, color rendering and color luster are also available.

Advantages of CCD, however.

The power consumption of CCD is relatively high, and the mobile phone is lightweight, and the volume of CCD module products cannot be effectively reduced, so it is relatively expensive.

CMOS in the digital camera market due to:

CMOS can achieve high integration with products, so the application level is straightforward.

The biggest advantage is that it can be miniaturized and rolled to reduce the volume, plus the best ratio.

CCD is cheaper

Low power consumption, so it is very popular with mobile phone manufacturers, but.

CMOS has poor sensitivity and sharpness. It's annoying.

Which one is better.

When it comes to orthodox digital cameras, three million or five million paintings are commonplace, and CCDs are comparable in terms of light sensitivity, sharpness, and resolution.

CMOS is good, but at present, domestic camera phones are only in between.

Ten thousand, in all fairness, the difference is really not big.

In addition, although most camera phones have 2

Segment digital zoom.

So far. samsung

X789 is the most segment), in fact, it uses the built-in program of the digital friend Biden camera to simulate the zoom effect, which is different from the optical zoom of the telescopic lens of the traditional camera.

Although digital cameras. CCD or.

The image sensor of CMOS is enough to affect the quality of photography, but because the built-in pixel is too low, the impact is not large.

CCD is the English Charge

coupled

The abbreviation of device, which means in Chinese:

Charge coupler.

A CCD is a semiconductor device that converts optical images into digital signals.

The tiny light-sensitive substance implanted in the CCD is called a pixel. The more pixels a CCD contains, the higher the resolution it provides. CCD acts just like film, but it converts Tudan scrambled pixels into digital signals.

There are two kinds of CCD processing technology, one is TTL process, one is CMOS process, now the CCD and CMOS on the market are actually CCD, but the processing technology is different, the former is the power consumption of the milliampere level, and the second latter is the power consumption of the micro ampere level. The imaging quality of CCD under TTL process is better than that under CMOS process.

Image sensor. The selection of the camera should be based on the size of the image sensor, lens style, quality, optical zoom range, aperture, ISO, image sensor pixels, etc., try to choose a large CCD, periscope lens imaging poor.

The true size of the 1-inch CCD is. Entry-level SLR sensor size:

mm, full-width SLR sensor size:

The high pixel of mm does not mean that the image is good, and the pixel is only increased without increasing the sensor size, and the sensor is overloaded and loses accuracy, and it is easy to appear small spots or strange colors when the light is poor.

Fashion selection Sony, photography selection Nikon, Canon, Sony camera Daming is very good, the camera is average, low cost performance.

The card machine is more than 1700 is luxurious, and the light change is low-end if it is less than 5 times.

AA is convenient and cheap, use 2 and 2 other 2 standby, 4 charging AA is only more than 100, in case there is no power just 2 AA, lithium is expensive, in case there is no power and no play, it is recommended that Supermaster and Nanfu high-capacity rechargeable batteries.

1. Canon A2100 pixels 12.1 million.

Image sensor size: 1 inch.

Optical zoom 6x.

The same rolling material is effective at 35mm focal length 36-216, about 1700 yuan.

2. Nikon S700

Pixels: 12.1 million.

Image sensor size: 1

Inch. Optical zoom: 3x.

Equivalent to 35mm size: 37-111mm

About 1700 yuan.

3. Kodak Z1485 pixels 14 million.

Image sensor size: 1 inch.

Optical zoom: 5x.

Equivalent to 35mm focal length 35-175

About 1400 yuan.

It is. Film, didn't you put the film in the camera before, but now it's a CCD in the position of the glue friend's blockbuster, you know? However, it is not as big as film, the CCD of the card machine is the size of your little fingernail, and the professional Haosong vertical SLR machine is as big as the film used before.

It's expensive though.

To put it simply, CCD or CMOS is collectively referred to as the image sensor, the larger the area of the image sensor, the better, 1 inch belongs to the diagonal length of the image sensor, DC generally says this, the larger the value is the better (1 inch is better than 1 inch), this is not only an imaging problem but also related to the quality of imaging under high sensitivity (how much is the ignorance point), of course, the larger the value, the higher the cost of the camera, so now the high-end DC generally uses 1, and the general DC basically uses 1, Generally, the telephoto machine also uses 1, but this is related to the long focal length, if the image sensor is too large, the lens aperture and pants will be larger, and it cannot be portable (optical principle). In addition, the size of the pixel and the sensor are also related, but now it is generally about 10 million to 12 million pixels, so the difference is not large, so it can be ignored.