What are the characteristics of digital cameras?

What are the characteristics of digital cameras? For those who pursue image quality, the surprises brought by improved image quality cannot be measured by money at all. Representative models include Sony's DVCAM series models.

What are the characteristics of digital cameras

1. The colors are more pure.

The chroma and brightness signal bandwidth of DV is almost 6 times that of an analog camera, and the chroma and brightness bandwidth is one of the most important factors in determining image quality, so the color of the image captured by DV is more pure And brilliant, it has also reached the level of professional cameras.

2. Small size and light weight.

Compared with analog cameras, the size of DV machines is greatly reduced, generally only about 123mm × 87mm × 66mm, and the weight is greatly reduced, generally only about 500 grams, which greatly facilitates users. It measures 74.7mm×61.9mm×26.9mm and weighs only 90 grams, which is lighter than most mobile phones.

3. Lossless copying.

The signals recorded on DV tapes can be transcribed countless times without any degradation in image quality, which is beyond the reach of analog cameras.

4. High definition.

Analog cameras record analog signals, so the image clarity (also called resolution, resolution or resolution) is not high. For example, the horizontal clarity of a VHS camera is mainly 240 lines, and it is best to use Hi8 The model also only has 400 lines. DV records digital signals, and its horizontal resolution has reached 500~540 lines, which is comparable to professional cameras.

Content extension:

Working principle

1. The basic working principle of digital cameras is simply that of light---electricity---digital signals. Transformation and transmission, that is, converting light signals into current through photosensitive elements;

Second, converting analog electrical signals into digital signals, which are processed and filtered by specialized chips, and the information obtained is restored. See the dynamic picture.

3. The photosensitive element of a digital camera can convert light into electric charge and convert it into a digital signal through an analog-to-digital converter chip. There are two main types:

One is widely used CCD (charge coupling) element;

The other is CMOS (complementary metal oxide conductor) device.

High-definition camera features

1. High image definition

High-definition IP network camera, which uses a 5-megapixel progressive scan CMOS image sensor with high definition Up to 720P (1280*720 resolution)/1080P (1920*1080 resolution) full real-time broadcast-level image quality, the clarity is much higher than the traditional CCD analog camera, truly achieving the goal of high-definition monitoring.

2. Color restoration is lifelike

The video capture compression chip used in the system is a world-famous brand from the United States, and is also the provider of professional broadcast-level video capture chips such as Sony and Panasonic. , the color display is comparable to the color reproduction of professional 3CCD cameras, and it has absolute advantages in many aspects such as high fidelity of image color, color information processing, wide dynamic range, and system noise reduction.

3. Long system life

Since the system uses a CMOS image sensor, the camera has low power consumption and heat generation. The stability is also much higher than traditional analog cameras. At the same time, because the components are relatively simple, the failure rate is relatively low. It will support POE power supply and power supply directly through network cable, solving the problem of on-site power supply.

4. The system has strong environmental adaptability

The system has an adaptive intelligent adjustment mode, which will automatically adjust the camera’s aperture, gain, noise reduction and other parameters according to different light environments, and can Always maintain the most perfect picture effect. Since the system realizes full digitization of monitoring from collection to storage, the traditional phenomenon of cameras being affected by light changes that directly affect image quality will not exist. At the same time, the common video signal interference in line transmission will also completely disappear.

Advantages of high-definition cameras

1. The traffic monitoring system provides intuitive on-site images to the command center. Usually, more than 70% of people's information comes from vision. Commanders and relevant leaders can fully understand the actual traffic conditions and public security conditions on major roads and key traffic intersections through large screens, computers and other display devices, providing first-hand information for decision-makers.

2. When an emergency occurs, you can watch the event process on the big screen in real time, and you can also call playback recordings, etc. Therefore, the performance of the front-end camera part and the quality of the image signal will directly affect the results of real-time recording and real-time monitoring of the system. Under the framework of high-definition surveillance technology, one high-definition camera can achieve the monitoring effect of several ordinary cameras, and its surveillance coverage is wider and wider. Moreover, the image resolution is higher and the amount of information is richer, which can effectively reduce the system scale and avoid complicated video image, control and power supply transmission lines.

3. In addition, the use of high-definition cameras can also greatly reduce the configuration of front-end and back-end equipment, thereby reducing the overall construction cost. Therefore, high-definition surveillance technology will promote the transformation of video surveillance system construction toward intensification and efficiency. The use of advanced photoreceptors makes image details clearer and more delicate. The progressive scanning method can provide better image quality, effectively solve the comb-like blur phenomenon caused by interlaced scanning, and also provide favorable conditions for applications such as intelligent analysis. Prerequisite, which is of great significance for intelligent analysis applications such as license plate and face recognition.