Sony IMX183Sensor size

Because of field aberrations (such as field curvature), the value of the limiting resolution and acutance depends on the field position.

The innovative BI (back-illuminated) sensor technology of the Sony IMX183 provides excellent sensitivity and low noise at a small pixel size of 2.4 µm. With this particularly light-sensitive sensor, the four new ace cameras offer outstanding image quality even in low light conditions.

Sony IMX183datasheet

Sony imx183price

…Exmor R series extend the portfolio of our most successful camera series, the ace. Four new ace U models with the IMX183 rolling shutter CMOS sensor from Sony’s Exmor R series extend the portfolio of our most successful camera series, the ace. The cameras offer a resolution of 20 megapixels with a sensor size of 1″ and a compact design with 29 mm x 29 mm footprint. They deliver frame rates of up to 17 frames per second. These characteristics make the four new ace U models particularly attractive for inspection of the finest structures, such as in printed circuit boards or display production. Constant increases in the resolution of modern displays require ever-higher resolutions in the inspecting camera. The four new high-resolution ace U models feature Basler’s PGI feature set for color and monochrome cameras, which corrects unwanted artifacts. This allows users a particularly good image evaluation at the pixel level. Thus, we enable detailed inspection of high-resolution displays with excellent image quality at a very attractive price.

DSLR lenses usually have a radial symmetry, which means that field dependency can be summarized by the MTF at different distances to the image center.

Sharpness is based on the MTF measurement. Let’s start with a practical measurement experiment to help describe what MTF is. If we look at a series of black and white stripes with varying spatial frequency and fixed contrast (same reflectance ratio between black and white, independent of the spatial frequency), we can see that the image of high-frequency stripes has a lower contrast than that for low-frequency stripes. For very high frequencies, the image eventually becomes (almost) uniform, with an intermediate level between black and white, which our eyes perceive as a shade of gray.

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For the DxOMark sharpness score, we compute MTF in horizontal and vertical directions by examining the spatial response of the camera to a perfect edge. This measurement follows ISO standard 12233.

Sony imx183specs

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Sony IMX183quantum Efficiency

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The value of the MTF at frequency 0 is always 100% since a flat field is considered to have been reproduced perfectly, with no intensity loss. Attenuation due to lens transmission is measured separately.

An objective measure of sharpness which takes into account the sensitivity of the human visual system to specific spatial frequencies and the viewing distance of an image. Edge acutance refers to the ability of a photographic system to show a sharp edge between contiguous areas of low and high illuminance. Texture acutance refers to the ability of a photographic system to show details without noticeable degradations.

SonyIMX989

We map the acutance on a color scale as a function of focal length and aperture value. We make measurements for several field positions.

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The MTF precisely describes the contrast attenuation: for each spatial frequency, the MTF plots the ratio of the output modulation versus the test object modulation.

SonyIMX541

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All four new ace U cameras are available with proven GigE and USB 3.0 interfaces and include the feature set PGI, a unique combination of 5×5 Debayering, Color-Anti-Aliasing, Denoising and Improved Sharpness. The GigE models also offer powerful GigE Vision 2.0 features such as PTP. Our pylon Camera Software Suite ensures a fast and simple integration of the ace cameras.

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SonyIMX708 datasheet

The resolution of a camera is defined by the size of the smallest detail that the camera can optically discriminate. ISO standard 12233 defines the limiting resolution as the first frequency such that the contrast attenuation is 95% (hence a MTF value of 5%). In practice, this value is very small and is also sensitive to measurement noise

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Sharpness is a subjective quality attribute of an image or a lens. Sharpness indicates the visually perceived quality of details of an image or details reproduced by a lens. It is associated with both resolution and contrast of reproduced details (within an image or by a lens).

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The DxOMark score for Sharpness is based on the Perceptual Megapixel (P-Mpix) concept that weights the Modulation Transfer Function (MTF) of the lens with the human visual acuity. Read more about Perceptual Megapixels.

Other areas of application are in the traffic sector, where a single ace U 20 MP camera is often sufficient for monitoring multi-lane highways, and in land surveying, where lightweight, high-resolution cameras are required to capture large or inaccessible areas from the air.

We plot the acutance as a function of the radial field position, taking into consideration horizontal and vertical directions. We make measurements for several focal lengths and aperture values.

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