An image sensor is the key component of any kind of camera and vision system. Our primary consideration when selecting a PTZ camera is its image sensor. An image sensor is a device that detects and converts light signals into electrical signals to make an image. This article discusses 11 Key Parameters when choosing an image sensor.
Generally speaking, image sensors are typically used in standalone or embedded digital cameras to capture light through the lens, convert it into an electronic signal, and then send that signal to a processor, which converts the electronic signal into digital images.
An image sensor’s photosensitive area consists of a one- or two-dimensional matrix arranged by many pixels, in which a pixel (pixel) is a single photosensitive unit. The resolution of the sensor is determined by the number of pixels in the horizontal and vertical direction of the matrix, that is, the number of pixels of the image sensor = resolution.
The frequency of images recorded or captured per second. The frame rate represents the number of times per second that the sensor is able to update while processing the image. Higher frame rates provide a smoother, more lifelike visual experience.
Sensitivity is an important indicator of the photoelectric performance of sensors. High sensitivity means that a clear image can be obtained when the light is dim or the exposure time is short.
The dynamic range is determined by the signal processing capability and noise of the CMOS sensor, which reflects its working range. Referring to the dynamic range of the CCD, its value is the ratio of the signal peak voltage at the output to the root mean square noise voltage, usually represented by DB.
Quantum efficiency is the absorption and conversion efficiency of a device in different bands of light. It is an important parameter describing the photoelectric conversion capability of an optoelectronic device, which is the ratio of the average number of photoelectrons produced per unit time to the number of incident photons at a specific wavelength. As the surface state (rough or smooth) of the photoelectric surface changes, so does the amount of photoelectron escaping. One photon is converted into an electron for every two that hit the photosensitive area if the quantum efficiency is 50%.
The signal voltage Vs and signal current Is of the sensor are functions of the incident light wavelength λ. The spectral response characteristic refers to the relationship between the response capability of the sensor and the wavelength, which determines the spectral range of the CMOS sensor.
This is the ratio of signal voltage to noise voltage. The unit of the signal-to-noise ratio is expressed in dB. The higher the signal-to-noise ratio, the better the noise control. This parameter is related to the number of noise in the image, the higher the signal-to-noise ratio, the clarity the picture, and the less noise in the night vision picture. The signal-to-noise ratio given in the manual is generally a parameter at a gain of zero.
This blog explains what an image sensor is and outlines 11 parameters that can be used to select the right image sensor for you.
With great advancement of technology, China’s PTZ camera is also developing rapidly, PTZ cameras for live streaming use world-class imaging sensors, including but not limited to Sony and Panasonic. If there is a need to source PTZ cameras, feel free to contact Telycam.
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