Abstract:
The present invention discloses a fixed pattern noise elimination circuit for CMOS image sensor, comprising a static random access memory (SRAM), a shift register, an analog signal processor (ASP), an analog-to-digital converter (ADC), a digital-to-analog converter (DAC) and a comparator. With the present invention, the nonuniformity resulted from the bias mismatch between columns of the CMOS image sensor can be corrected for each frame; therefore, the fixed pattern noise (FPN) in the CMOS image sensor can be eliminated, the imaging quality of the CMOS image sensor can be improved greatly, and the processing circuit for the CMOS image sensor can work in pipeline mode.
Abstract:
A method and a device for enhancing an edge of an image are provided. The method includes : obtaining a first gradient value of a pixel; determining whether the pixel is at a rough edge according to the first gradient value; if yes, obtaining a first edge enhancement value of the pixel and obtaining a first edge enhancement result of the pixel according to the first edge enhancement value; if no, obtaining a second gradient value of the pixel; determining whether the pixel is at a tiny edge according to the second gradient value; if yes, obtaining a second edge enhancement value of the pixel and obtaining a second edge enhancement result of the pixel according to the second edge enhancement value; if no, obtaining the pixel value of the pixel as the edge enhancement result of the pixel; and repeating above steps until each pixel of the image is processed.
Abstract:
A method and a device for obtaining a high dynamic range image are provided. The method includes: obtaining a pixel value of each pixel in two images of a same scene; determining a brightness value of each pixel in the two images; determining an objective brightness value of each pixel in a combined image combining the two images; determining a color value of each pixel in the two images; determining a color value of each pixel in the combined image; correcting the color value of each pixel in the combined image so as to obtain a corrected color value of each pixel in the combined image; determining a pixel value of each pixel in the combined image; and obtaining a high dynamic range image.
Abstract:
A method for removing a sunspot of an image sensor, an apparatus for removing a sunspot of an image sensor and an image sensor are provided. The method includes: obtaining reset sampling signal values of pixel units in a pixel array of the image sensor; for each of the reset sampling signal values, determining whether the reset sampling signal value is less than a predetermined sampling signal threshold, and generating a comparing signal when the reset sampling signal value is less than the predetermined sampling signal threshold; generating location information of the pixel unit corresponding to the reset sampling signal value according to the comparing signal; and replacing the reset sampling signal value corresponding to the location information with a maximum brightness value.
Abstract:
A pixel cell, a method for manufacturing the same and an image sensor comprising the same are provided. The pixel cell comprises: a substrate (101); a photodiode (103), a pass transistor (107) and a floating diffusion structure (104) respectively formed on the substrate (101), in which the pass transistor (107) is formed between the photodiode (103) and the floating diffusion structure (104); and a PINNED structure (105), formed on the substrate (101) and connected with the floating diffusion structure (104), in which a reset voltage of the floating diffusion structure (104) is higher than a depletion voltage of the PINNED structure (105).
Abstract:
A pixel array and a pixel unit are provided. A pixel array comprises: a plurality of pixel rows (100), each pixel row (100) comprising a plurality of pixel units (101), in which a length of a pixel unit (101) is twice of a height of the pixel unit (101), any two adjacent pixel rows (100) are staggered, and a staggered distance between the any two adjacent pixel rows (100) is equal to the height of the pixel unit (101). A pixel array comprises: a plurality of pixel columns (200), each pixel column (200) comprising a plurality of pixel units (201), in which a height of each pixel unit (201) is twice of a length of the pixel unit (201), any two adjacent pixel columns (200) are staggered, and a staggered distance between the any two adjacent pixel columns (200) is equal to the length of the pixel unit (201).
Abstract:
An image forming system and an image sensor are provided. The image forming system (100), including: a substrate (10); a pixel array (20), formed on the substrate (10), including a plurality of pixel units, wherein each pixel unit includes: an image pixel subunit (25), a collecting pixel subunit (24), and an electroluminescent sheet (26), configured to cover the image pixel subunit (25); and a controller (30), connected with the pixel array (20) and configured to control the collecting pixel subunit (24) to detect incident light, such that the collecting pixel subunit (24) generates a voltage signal according to an intensity of the incident light and outputs the voltage signal to the electroluminescent sheet (26) so as to enable the electroluminescent sheet (26) to generate an attenuated optical signal from the incident light; and to control the image pixel subunit (25) to detect the attenuated optical signal, such that image pixel subunit (25) generates an image signal according to the attenuated optical signal.
Abstract:
A pixel array is provided. The pixel array comprises a plurality of two-dimensionally arranged 4*4 Bayer matrix units, in which the matrix unit comprises a plurality of pixels, any of a green filter, a red filter and a blue filter is disposed in one pixel, and a part of the green filters are replaced by a white color filter in the matrix units. A camera using the same and a color processing method based on the pixel array are also provided.
Abstract:
A method for reading out a high dynamic range image frame in an image sensor and a device using the same are provided. The image sensor comprises a pixel array with a plurality of pixels arranged in columns and rows. The device comprises a pixel array comprising a plurality of pixels arranged in columns and rows; a calculating unit, configured to calculate and determine a first integration time and a second integration time according to an output image frame information; and an integration time processing unit.