Technologies are described herein that are configured to generate a corrected image by addressing photo response nonuniformity (PRNU) in a camera having a global shutter. A calibration procedure is described, where correction factors for each pixel in an image sensor are computed and subsequently employed to generate improved images.

Technologies are described herein that are configured to generate a corrected image by addressing photo response nonuniformity (PRNU) in a camera having a global shutter. A calibration procedure is described, where correction factors for each pixel in an image sensor are computed and subsequently employed to generate improved images.

A digital pixel sensor for correcting and reducing a mismatch between a pixel and an analog digital converter provided. The digital pixel sensor includes a pixel array including a plurality of pixels; and a bank disposed on the pixel array. The bank includes: a plurality of comparators disposed on the plurality of pixels and configured to compare each of a plurality of pixel signals output from the plurality of pixels with a reference signal to output a plurality of comparison result signals; and a counter connected to the plurality of comparators, and configured to receive the plurality of comparison result signals and latch count code based on the plurality of comparison result signals.

A streaking correction circuit of the present disclosure includes a correction signal generation section and a correction process section. The correction signal generation section generates a correction signal on the basis of signals of light-shielded pixels of light-shielded portions provided at edge portions of a pixel array section having pixels, each including a light reception section, arranged in a matrix pattern. The correction process section performs a correction process on signals of effective pixels of the pixel array section by using the correction signal generated by the correction signal generation section. Then, the correction signal generation section divides a captured image into a plurality of regions relative to a position of a singular point in the captured image and generates a correction signal for each divided region by using signals of the light-shielded pixels. The correction process section performs the correction process by using the correction signal generated for each divided region.

A CMOS optical sensor comprises spare readout channels to replace readout channels found defective at the end of the manufacturing process. These spare readout channels are dispatched over the width of the optical sensor (corresponding to the row direction) in the form of spare groups G.sub.m1, G.sub.m2, Gm.sub.3 of m spare readout channels each, m integer at least equal to 1. Each spare group is inserted between two successive default groups Gn.sub.1 and Gn.sub.2 of n default readout channels each and coupling means SW1 are configured to replace a defective default readout channel in a default group as well as any default readout channels of the group between the defective one and the spare group next to the default group of concern. Advantageously, for a row Row.sub.i being currently selected for CDS reading each pixel in the row, a row noise level V.sub.RN.sub.i is obtained from the A spare readout channels that are not used in the implemented repairing scheme, by sampling an analogic DC reference signal by each of the A spare readout channels and averaging the A values Sp.sub.k obtained. The row reference value V.sub.RN.sub.i is then subtracted from each of the pixel digital signal S.sub.i,j outputs for the current selected row, to finally obtain a signal value d.sub.i,j with row noise suppression.

Techniques are disclosed for imager health monitoring systems and methods. In one example, a method includes determining a characteristic of an active unit cell of a focal plane array (FPA) and/or a reference unit cell of the FPA. The active unit cell includes a detector selectively shielded from an incident scene. The reference unit cell includes a reference detector shielded from the incident scene. The method further includes determining a state of the FPA based at least in part on the characteristic. The method further includes transmitting an indication of the state of the FPA to selectively cause adjustment of the FPA Related devices and systems are also provided.

Various embodiments disclosed herein describe a divided-aperture infrared spectral imaging (DAISI) system that is adapted to acquire multiple IR images of a scene with a single-shot (also referred to as a snapshot). The plurality of acquired images having different wavelength compositions that are obtained generally simultaneously. The system includes at least two optical channels that are spatially and spectrally different from one another. Each of the at least two optical channels are configured to transfer IR radiation incident on the optical system towards an optical FPA unit comprising at least two detector arrays disposed in the focal plane of two corresponding focusing lenses. The system further comprises at least one temperature reference source or surface that is used to dynamically calibrate the two detector arrays and compensate for a temperature difference between the two detector arrays.

An infrared imaging system is provided. The system includes a sensor configured to receive light emitted by a scene and at least a portion of scenic flux to generate image data, a light source configured to provide calibrating light to offset at least a portion of the scene flux, the light source positioned such that an output of the light source is at a pupil of the infrared imaging system, and at least one image processing device. The image processing device is configured to receive the image data generated by the infrared sensor, determine at least one change in the scenic flux as received by the infrared sensor, determine if the at least one change in the scenic flux results in a change in pixel response of the infrared sensor that exceeds a response threshold, and if the change in pixel response exceeds a threshold, generate an updated calibration table.

Techniques for facilitating non-uniformity mitigation for imaging systems and methods are provided. In one example, a method includes cropping an image based on a defect in the image to obtain a cropped image. The method further includes cropping a supplemental flat field correction (SFFC) map based on the defect in the image to obtain a cropped SFFC map. The method further includes determining a scaling value of a scaling term based at least on a cost function. The method further includes scaling the SFFC map based on the scaling value to obtain a scaled SFFC map. Related devices and systems are also provided.

A pixel circuit wherein a pixel arrangement comprises a pixel comprising a photodetector, an integrator for accumulating a signal from the photodetector, a source following output transistor for amplifying the integrated signal, and a current source for applying a readout current through the output transistor, a voltage regulating circuit comprising an amplifier, a replica transistor dimensioned substantially the same as the output transistor, and a replica current source for providing substantially the readout current through each replica transistor, a gate of the replica transistor is connected with an output node of the amplifier connected with the pixel arrangement, and a source of the replica transistor is connected with a negative input of the amplifier, and with the replica current source, a predefined reference voltage is applicable to a positive input.