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Industry News

  • 22,Oct,2021

Guidelines for Camera Purchase: Analysis of Photosensitive Chips and Master Chips

 Guide to Selecting a Camera: Analysis of Image Sensor and Main Control Chip

  

1. Image Sensor (SENSOR)

The image sensor is a crucial component of digital cameras, primarily divided into two types based on the element used: CCD and CMOS.

  

1. CCD (Charge Coupled Device,)

   CCDs are commonly used in high-end photography and videography due to their mature technology and excellent imaging quality. However, they are expensive, have complex manufacturing processes, high costs, and higher power consumption.

2.CMOS (Complementary Metal-Oxide Semiconductor)
   CMOS sensors are mainly used in products with lower image quality requirements. Compared to CCDs, CMOS sensors offer several advantages: they are cheaper, consume less power (about 1/3 of that consumed by CCDs), and have a higher integration level. However, CMOS sensors have some disadvantages, such as higher noise levels and lower sensitivity. Early CMOS sensors required better lighting conditions, but modern advancements in image processing technologies, such as automatic gain control, automatic brightness and white balance adjustment, color saturation regulation, contrast enhancement, edge enhancement, and gamma correction, have improved the imaging quality of CMOS sensors to be closer to that of CCD cameras.

  In terms of image quality, CCD cameras generally provide higher transparency and sharpness, more accurate color reproduction, and better exposure. CMOS cameras, on the other hand, typically offer lower transparency, weaker color reproduction, and less accurate exposure.    

  High-end cameras predominantly use CCD sensors, while mainstream products often feature both CCD and CMOS sensors. Overall, CCD sensors tend to perform better. The size of CCD elements is usually 1/3 inch or 1/4 inch. When choosing a camera with the same resolution, it is advisable to select one with a larger sensor size. Users should choose a camera based on their specific needs and budget.

Points to Note When Using a Camera:

  Avoid Backlight Conditions: Both CCD and CMOS sensors should not be used in backlight environments, especially when directly facing the sun, to prevent damage to the camera.

 Ensure Adequate Lighting: Insufficient ambient light can significantly affect image quality. This issue can be addressed by increasing the surrounding brightness or selecting a camera with a lower minimum illumination requirement, such as one that can operate at 5 lux.

  Proper Use of Zoom: Correctly adjusting the lens zoom can significantly improve the shooting effect, even achieving results similar to those of a chip shot.

 Currently, the market sales ratio of CCD and CMOS cameras is roughly equal. Due to higher costs, fewer manufacturers produce cameras using CCD image sensors.

2. Main Control Chip (DSP)

The selection of the main control chip is primarily based on the cost of the camera and market acceptance. As DSP design and production technologies have matured, there is little difference in technical specifications among various brands. However, some DSPs still have room for improvement in subtle details and driver programs.

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