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CN-117278859-B - Electronic device and infrared light interference reduction method thereof

CN117278859BCN 117278859 BCN117278859 BCN 117278859BCN-117278859-B

Abstract

An electronic device and an infrared light interference reduction method thereof. The method comprises the following steps. The image sensor is used for detecting the ambient light information, wherein the image sensor comprises a plurality of sensing pixels for sensing visible light and infrared light. And determining the infrared light interference intensity according to the ambient light information. The image sensor is controlled according to the infrared interference intensity to perform image sensing according to one of the original exposure time and the new exposure time. And controlling the image sensor to perform image sensing according to the original exposure time in response to the infrared light interference intensity not being greater than the critical value. And controlling the image sensor to perform image sensing according to a new exposure time in response to the infrared light interference intensity being greater than the critical value, wherein the new exposure time is shorter than the original exposure time.

Inventors

  • ZHENG ZHENRU

Assignees

  • 宏碁股份有限公司

Dates

Publication Date
20260512
Application Date
20220610

Claims (12)

  1. 1. A method of infrared light interference reduction, the method comprising: detecting ambient light information by using an image sensor, wherein the image sensor comprises a plurality of sensing pixels for sensing visible light and infrared light; determining the infrared light interference intensity according to the ambient light information, and Controlling the image sensor to perform image sensing according to one of an original exposure time and a new exposure time according to the infrared interference intensity, The step of controlling the image sensor to perform image sensing according to one of the original exposure time and the new exposure time according to the infrared light interference intensity comprises the following steps: Controlling the image sensor to perform image sensing according to the original exposure time in response to the infrared light interference intensity not being greater than a critical value, and And controlling the image sensor to perform image sensing according to the new exposure time in response to the infrared light interference intensity being greater than the critical value, wherein the new exposure time is shorter than the original exposure time.
  2. 2. The infrared light interference reduction method according to claim 1, characterized in that the method further comprises: and in response to the infrared light interference intensity being greater than the critical value, adjusting the gain value of the image sensor based on the ambient brightness, and controlling the image sensor to perform image sensing according to the adjusted gain value.
  3. 3. The method of claim 1, wherein the step of detecting ambient light information using the image sensor comprises: And determining ambient light information including an ambient light wavelength range according to RGB channel data generated by a part of the sensing pixels in the image sensor for sensing the visible light.
  4. 4. The infrared light interference reduction method according to claim 3, wherein the step of determining the infrared light interference intensity based on the ambient light information comprises: and determining the infrared light interference intensity according to the ambient light wavelength range and the infrared light sensing characteristic of the image sensor.
  5. 5. The method of claim 4, wherein the infrared light interference intensity is determined by looking up a lookup table based on the ambient light wavelength range, the lookup table being established based on infrared light sensing characteristics of the image sensor.
  6. 6. The method of claim 3, wherein the RGB channel sensing data includes red channel values, green channel values, and blue channel values, and the determining the ambient light information including the ambient light wavelength range comprises: Calculating a red-green ratio value between the red channel value and the green channel value, and calculating a blue-green ratio value between the blue channel value and the green channel value, and And determining the ambient light wavelength range according to the red-green ratio value and the blue-green ratio value.
  7. 7. An electronic device, comprising: The image sensor comprises a plurality of sensing pixels for sensing visible light and infrared light; storage device, and A processor, coupled to the image sensor and the storage device, configured to: Detecting ambient light information using the image sensor; Determining infrared light interference intensity according to the ambient light information; controlling the image sensor to perform image sensing according to one of an original exposure time and a new exposure time according to the infrared light interference intensity; Controlling the image sensor to perform image sensing according to the original exposure time in response to the infrared light interference intensity not being greater than a critical value, and And controlling the image sensor to perform image sensing according to the new exposure time in response to the infrared light interference intensity being greater than the critical value, wherein the new exposure time is shorter than the original exposure time.
  8. 8. The electronic device of claim 7, wherein the processor is configured to: and in response to the infrared light interference intensity being greater than the critical value, adjusting the gain value of the image sensor based on the ambient brightness, and controlling the image sensor to perform image sensing according to the adjusted gain value.
  9. 9. The electronic device of claim 7, wherein the processor is configured to: And determining ambient light information including an ambient light wavelength range according to RGB channel data generated by a part of the sensing pixels in the image sensor for sensing the visible light.
  10. 10. The electronic device of claim 9, wherein the processor is configured to: and determining the infrared light interference intensity according to the ambient light wavelength range and the infrared light sensing characteristic of the image sensor.
  11. 11. The electronic device of claim 10, wherein the infrared light interference intensity is determined by looking up a lookup table based on infrared light sensing characteristics of the image sensor according to the ambient light wavelength range.
  12. 12. The electronic device of claim 9, wherein the RGB channel sensing data comprises a red channel value, a green channel value, and a blue channel value, and the processor is configured to: Calculating a red-green ratio value between the red channel value and the green channel value, and calculating a blue-green ratio value between the blue channel value and the green channel value, and And determining the ambient light wavelength range according to the red-green ratio value and the blue-green ratio value.

Description

Electronic device and infrared light interference reduction method thereof Technical Field The present invention relates to an electronic device, and more particularly, to an electronic device and an infrared interference reduction method thereof. Background In the past, the image sensor has focused on sensing visible light, so the image sensor has an infrared light Filter (IR Cut Filter) in its structure, and the IR Filter is used for filtering infrared light, so as to avoid distortion of the visible light sensed by the photosensitive pixels due to the influence of the infrared light. In recent years, the photographic functions of various consumer electronic products are becoming more and more diversified, and the demands of users for night shooting and infrared image shooting are also becoming more and more important. Thus, a hybrid image sensor for simultaneously sensing visible light and infrared light has been proposed to meet the above-mentioned needs. The hybrid image sensor is widely used in many applications at present, mainly because the hybrid image sensor can reduce the installation space requirement and the cost. However, when the hybrid image sensor is used, the infrared light filter is removed or an infrared light filter allowing a part of the infrared light to pass through is used, so that the infrared light sensing pixel of the hybrid image sensor can sense the infrared light. In this way, the visible light sensing pixel of the hybrid image sensor also receives infrared light, thereby causing a color shift phenomenon of the sensing image. FIG. 1 is a graph of spectral response of a hybrid image sensor. Referring to FIG. 1, according to the response curves L1-L3 of the RGB channels, the RGB channels can sense infrared light while sensing visible light (400-750 nm). Similarly, according to the response curve L4 of infrared light, the Infrared (IR) channel senses infrared light and also senses visible light. Currently, a correction method is to use an Image Signal Processor (ISP) to correct the sensing result of the RGB channel, and the image signal processor will clip out the IR signal quantity with a certain amplitude from the sensing signal of the RGB channel. For example, the 12-bit data generated by digitizing the RGB channel sensing signal is directly subtracted by a predetermined level (e.g., 300), and then the subtracted result is mapped back to 8-bit data. However, the above method only can roughly cancel the influence component of the infrared light, and cannot adjust to the actual influence condition of the infrared light, so that the image quality is affected. In other words, even if the infrared component of the ambient light is low, the whole sensed image loses a digital signal of a certain level, and the sensed image is adversely affected. Disclosure of Invention In view of the above, the present invention provides an electronic device and an infrared interference reduction method thereof, which can reduce the adverse effect of infrared light on RGB images. The embodiment of the invention provides an infrared light interference reduction method, which comprises the following steps. The image sensor is used for detecting the ambient light information, wherein the image sensor comprises a plurality of sensing pixels for sensing visible light and infrared light. And determining the infrared light interference intensity according to the ambient light information. The image sensor is controlled according to the infrared interference intensity to perform image sensing according to one of the original exposure time and the new exposure time. The step of controlling the image sensor to perform image sensing according to one of the original exposure time and the new exposure time according to the infrared light interference intensity comprises controlling the image sensor to perform image sensing according to the original exposure time in response to the infrared light interference intensity not being larger than a critical value, and controlling the image sensor to perform image sensing according to the new exposure time in response to the infrared light interference intensity being larger than the critical value, wherein the new exposure time is shorter than the original exposure time. The embodiment of the invention provides an electronic device, which comprises an image sensor, a storage device and a processor. The image sensor comprises a plurality of sensing pixels for sensing visible light and infrared light. The processor is coupled to the image sensor and the storage device and configured to execute the following steps. The image sensor is used to detect the ambient light information. And determining the infrared light interference intensity according to the ambient light information. The image sensor is controlled according to the infrared interference intensity to perform image sensing according to one of the original exposure time and the new exposure time. And controlling th