Method and device for irreversible privacy protection in image acquisition
An image acquisition device includes an optical sensor and a dimmer. The optical sensor includes a photosensitive area configured to convert optical signal into image signal. The dimmer is on a side of the optical sensor that receives the optical signal. The dimmer completely covers the photosensitive area. The dimmer is configured for modulating intensity of the optical signal projected onto the optical sensor. The dimmer includes dimming blocks. Each dimming block is configured for modulating intensity of light projected onto a portion of the photosensitive area. An electronic device and an image acquisition method are also provided.
1 . An image acquisition device comprising:
a circuit board comprising first connection wires and first connection pads;
an optical sensor, the optical sensor comprising a photosensitive area configured to convert an optical signal into an image signal; and
a dimmer on a side of the optical sensor that receives the optical signal, the dimmer covering the photosensitive area,
wherein along a thickness direction of the image acquisition device, a projection of the dimmer does not overlap with the first connection pads, the dimmer is electrically connected to the first connection pads by the first connection wires, the dimmer comprises a plurality of dimming blocks, and an opaqueness, to the optical signal, of each of the plurality of dimming blocks is variable, in response to a dimming block of the plurality of dimming blocks is controlled to 100% opaque to the optical signal, none of the optical signal is transmitted through a target portion of the photosensitive area, and no image information of the target portion is projected.
2 . The image acquisition device of claim 1 , wherein the optical sensor is between the circuit board and the dimmer, the circuit board further comprises a controller and circuit wires, and the optical sensor and the dimmer are electrically connected to the controller by different circuit wires.
3 . The image acquisition device of claim 2 , wherein each of the plurality of dimming blocks is independently controlled by the controller and electrically connected to the controller by different circuit wires.
4 . The image acquisition device of claim 3 , wherein each of the plurality of dimming blocks comprises a first conductive layer, a second conductive layer, and an electrochromic layer between the first conductive layer and the second conductive layer, the first conductive layer and the second conductive layer are configured to be applied with different voltages by the circuit wires, and the electrochromic layer is configured to change color under a voltage difference between the first conductive layer and the second conductive layer.
5 . The image acquisition device of claim 4 , wherein both the first conductive layer and the second conductive layer are made of transparent conductive materials.
6 . The image acquisition device of claim 4 , wherein each of the plurality of dimming blocks further comprises an ion storage layer between the first conductive layer and the electrochromic layer, and an electrolyte layer between the ion storage layer and the electrochromic layer, the ion storage layer is configured to store a certain amount of ions and electrons, and the electrolyte layer is configured to block electrons and allow ions to pass through.
7 . The image acquisition device of claim 3 , wherein the controller is configured to independently control a voltage applied to each of the plurality of dimming blocks, such that the opaqueness of each of the plurality of dimming blocks to the optical signal is varied.
8 . The image acquisition device of claim 2 , wherein each of the plurality of dimming blocks comprises a first conductive layer, a second conductive layer, and a liquid crystal layer between the first conductive layer and the second conductive layer, the first conductive layer and the second conductive layer are configured to be applied with different voltages by the circuit wires, and the liquid crystal layer is configured to switch between a transparent state and a dark state under a voltage difference between the first conductive layer and the second conductive layer.
9 . The image acquisition device of claim 8 , wherein both the first conductive layer and the second conductive layer are made of transparent conductive materials.
10 . The image acquisition device of claim 1 , wherein the dimmer further comprises a first transparent substrate and a second transparent substrate, and the plurality of dimming blocks is arranged between the first transparent substrate and the second transparent substrate.
11 . The image acquisition device of claim 1 , wherein the first connection wires are gold wires.
12 . An electronic device comprising:
a body;
an image acquisition device in the body; the image acquisition device comprising:
a circuit board comprising first connection wires, and first connection pads;
an optical sensor, the optical sensor comprising a photosensitive area configured to convert an optical signal into an image signal; and
a dimmer on a side of the optical sensor that receives the optical signal, the dimmer completely covering the photosensitive area,
wherein along a thickness direction of the image acquisition device, a projection of the dimmer does do not overlap with the first connection pads, the dimmer is electrically connected to the first connection pads by the first connection wires, the dimmer comprises a plurality of dimming blocks, and an opaqueness, to the optical signal, of each of the plurality of dimming blocks is variable, in response to a dimming block of the plurality of dimming blocks is controlled to 100% opaque to the optical signal, none of the optical signal is transmitted through a target portion of the photosensitive area, and no image information of the target portion is projected.
13 . The electronic device of claim 12 , wherein the optical sensor is between the circuit board and the dimmer, the circuit board further comprises a controller and circuit wires, and the optical sensor and the dimmer are electrically connected to the controller by different circuit wires.
14 . The electronic device of claim 13 , wherein each of the plurality of dimming blocks is independently controlled by the controller and electrically connected to the controller by different circuit wires.
15 . The electronic device of claim 14 , wherein each of the plurality of dimming blocks comprises a first conductive layer, a second conductive layer, and an electrochromic layer between the first conductive layer and the second conductive layer, the first conductive layer and the second conductive layer are configured to applied with different voltages by the circuit wires; the electrochromic layer configured to change color under a voltage difference between the first conductive layer and the second conductive layer, and both the first conductive layer and the second conductive layer are made of transparent conductive materials.
16 . The electronic device of claim 15 , wherein each of the plurality of dimming blocks further comprises an ion storage layer between the first conductive layer and the electrochromic layer, and an electrolyte layer between the ion storage layer and the electrochromic layer, the ion storage layer is configured to store a certain amount of ions and electrons, and the electrolyte layer is configured to block electrons and allow ions to pass through.
17 . The electronic device of claim 14 , wherein each of the plurality of dimming blocks comprises a first conductive layer, a second conductive layer, and a liquid crystal layer between the first conductive layer and the second conductive layer, the first conductive layer and the second conductive layer are configured to be applied with different voltages by the circuit wires; the liquid crystal layer configured to switch between a transparent state and a dark state under a voltage difference between the first conductive layer and the second conductive layer, and both the first conductive layer and the second conductive layer are made of transparent conductive materials.
18 . The electronic device of claim 14 , wherein the controller is configured to independently control a voltage applied to each of the plurality of dimming blocks, such that the opaqueness of each of the plurality of dimming blocks to the optical signal is varied.
19 . The electronic device of claim 12 , wherein the dimmer further comprises a first transparent substrate and a second transparent substrate, and the plurality of dimming blocks is arranged between the first transparent substrate and the second transparent substrate.
20 . An image acquisition method comprising:
obtaining a preview image of an image to be collected, and dividing the preview image into a plurality of regions, each of the plurality of regions corresponding to at least one dimming block;
selecting at least one target region from the plurality of regions on the preview image;
controlling a voltage applied to corresponding dimming blocks of the at least one dimming block corresponding to the at least one target region to change opaqueness of the corresponding dimming block to an optical signal projected onto the at least one dimming block, wherein in response to the opaqueness of the corresponding dimming block to the optical signal is controlled to be 100%, none of the optical signal is transmitted through the at least one target region and no image information, of the image to be collected, corresponding to the at least one target region is projected; and
converting the optical signal transmitted through the plurality of dimming blocks into an image signal.