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Image capturing device

An image capture device and image sensing technology, applied in image communication, TV, color TV components, etc., can solve problems such as unstable control loops

Inactive Publication Date: 2020-09-15
HIMAX IMAGING LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the autoexposure algorithm does not take into account the scene changes that occur during the interval, which leads to some autoexposure algorithm errors, makes the control loop unstable, and / or makes the autoexposure algorithm take longer to converge

Method used

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Embodiment Construction

[0033] As used herein, "first", "second", ... etc. do not specifically refer to a sequence or sequence, but are only used to distinguish elements or operations described with the same technical terms.

[0034] figure 1 is a schematic block diagram illustrating an image capture device according to an embodiment. Please refer to figure 1 , the image capture device 100 includes an image sensing circuit 110 , an amplifier 120 , an analog-to-digital converter 130 , and a processing circuit 140 . The amplifier 120 is disposed between the image sensing circuit 110 and the processing circuit 140 . The analog-to-digital converter 130 is provided between the amplifier 120 and the processing circuit 140 . The image sensing circuit 110 includes a plurality of photosensitive elements 109 , a row circuit 111 , a column decoder 112 , an exposure time circuit 113 and a mode control circuit 114 . These photosensitive elements 109 are, for example, charge-coupled devices (CCD), complementar...

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Abstract

An image capturing device including an image sensing circuit and a processing circuit is provided. The processing circuit controls the image sensing circuit to sense at least one partial frame beforesensing a full frame. A number of pixels of the partial frame is less than a number of pixels of the full frame, and exposure time of the partial frame is shorter than exposure time of the full frame.The processing circuit performs an automatic exposure procedure according to the partial frame to calculate a fast exposure time and gain, transforms the fast exposure time and gain into exposure time and gain for the full fame, and control the image sensing circuit to sense the full frame accordingly.

Description

technical field [0001] The present invention relates to an image capture device, and in particular to an image capture device capable of quickly adjusting exposure parameters. Background technique [0002] In the digital camera system, automatic exposure, automatic focus, automatic white balance, etc. are all important functions. Among them, automatic exposure is to adjust the aperture size, shutter speed, etc. according to the light brightness of the scene, and usually adjust the gain accordingly, so that the generated image has the required signal level (level). Some known auto-exposure algorithms need to first capture one or more images with a preset aperture size and shutter speed, and then calculate scene statistics for these images or regions of interest in the images, such as but not limited to histograms of signal levels , Average Brightness, Median Brightness, and / or Maximum Brightness, etc., before readjusting the aperture size and shutter speed. However, the abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
CPCH04N23/70H04N23/73H04N25/533H04N23/651H04N23/667H04N23/76H04N23/71H04N25/44H04N25/46H04N25/77
Inventor 米塔艾民江志坚苏斐玮
Owner HIMAX IMAGING LIMITED