Xiaomi 15 Camera test

For the score and analysis, DXOMark engineers acquire and evaluate over 2,600 test images both in controlled laboratory environments and in external, internal natural scenes and in low light conditions, using the predefined settings of the camera. The photographic protocol is designed to take into account the main cases of use and is based on typical shooting scenarios, such as portraits, family and landscape photography. The evaluation is performed by visually inspecting images compared to a reference of natural scenes and performing objective measurements on the images of graphs captured in the laboratory in different lighting conditions from 1 to 1,000+ lux and color temperatures of 2,300ka 6,500k.

Exposure and color are the key attributes for technically good images. For the exhibition, the main attribute assessed is the brightness of the main subject through various use cases such as landscape, portrait or dead life. Other factors evaluated are the contrast and the dynamic interval, e.g. The ability to make the details visible in brilliant and dark areas of the image. Repeatability is also important because it demonstrates the camera’s ability to provide the same rendering when you take several images of the same scene.
For the color, the quality attributes of the analyzed image are rendering skin tone, white balance, color shading and repeatability. For the rendering of the color tone and the skin, we penalize the unnatural colors but we respect the choice of the signature of the color by a manufacturer.

Autofocus tests focus on the accuracy of the focus, on the repeatability of focus, on the shooting delay and on the depth of the field. The shooting delay is the difference between the time when the user presses the acquisition button and the time when the image is actually taken. It includes the focus speed and the device ability to acquire images at the right time, what is called “zero lag of the shutter” capacity. Even if a depth of surface field can be pleasant for a single portrait or a blow close to, it can also be a problem in some specific conditions such as group portraits; Both situations are tested. The accuracy of the focus is also evaluated in all the images of the real life taken, from infinity to close objects and in low light conditions on external conditions.

The plot tests analyze the level of details and the plot of the subjects in the images taken in the laboratory and in the scenarios of real life. For natural shots, particular attention is paid to the level of details in the bright and dark areas of the image. Objective measurements are performed on images of the graph taken in various lighting conditions from 1 to 1000 lux and different types of dynamic range conditions. The graphs used are the owner DXomark graphic (DMC) and the graphic graph with dead leaves.

The noise tests analyze various attributes of noise such as intensity, chromaticity, wheat, structure on real life images and images of graphs taken in the laboratory. For natural images, particular attention is paid to noise on faces, landscapes, but also on dark areas and high dynamic range conditions. The noise on moving objects is also evaluated on natural images. Objective measurements are performed on images of graphs taken in various conditions from 1 to 1000 lux and different types of dynamic range conditions. The graph used is the dead leaves and the standardized measurement as the visual noise derived from ISO 15739.

The evaluation of the artifacts examines the shading of the objective, the chromatic aberrations, the geometric distortion, the evil of the edges, the halos, the ghost, the quantization, the unexpected changes of the color shade, among other possible innatural effects on the photos. The more serious and more frequent the artifact is, the greater the deduction of the point on the score. The main artifacts observed and the loss of corresponding points are listed below.

The bokeh is tested in a dedicated mode, usually in portrayed or opening mode, and analyzed by visually inspecting all the images captured in the laboratory and in natural conditions. The goal is to reproduce the portrait photography comparable to a socket with a DLSR and a large opening. The main quality attributes of the image to which they pay attention are the esteem of the depth, the artifacts, the blunder gradient and the shape of the bokeh spotlights. The quality attributes of the image are also taken into consideration (exposure, color, plot).

The preview tests analyze the quality of the image of the preview of the image of the image camera, with particular attention to the difference between the acquisition and the preview, in particular as regards the dynamic range and the application of the bokeh effect. It also evaluates the smoothness of the exposure, color and adaptation of focus when zooming from the minimum to that of the maximum available zoom factor. The frequency of preview frame is measured using the universal led timer.

Dxomark engineers acquire and evaluate over 400 images of tests in controlled laboratory environments and in external natural scenes, internal and in low light conditions, using the default settings of the camera and pinch the zoom to various zoom zoom factors long -range zoom. The evaluation is carried out by visually inspecting the images compared to a reference of natural scenes and performing objective measurements of the graphic magicians captured in the laboratory in different conditions from 20 to 1000 lux and color temperatures from 2300k to 6500k.

These tests analyze the performance of the ultra wide camera at different focal lengths from 12 mm to 20 mm. All the quality attributes of the image are evaluated, with particular attention to these artifacts such as chromatic aberrations, softness of the lenses and distortion. The images below are an extract of tested scenes.

All the quality attributes of the image are evaluated in focal lengths from about 40 mm to 300 mm, with particular attention to the plot and details. The score derives from a series of objective measurements in the laboratory and perceptual analysis of images of real life.

Dxomark engineers acquire and evaluate more than 2.5 hours of videos in controlled laboratory environments and in natural scenes of poor lighting, internal and external, using the default settings of the camera. The evaluation consists in visually inspecting the natural videos taken in various conditions and the execution of objective measurements on the videos of the graphs recorded in the laboratory in different conditions from 1 to 1000+ lux and color temperatures of 2,300ka 6,500k.

Exposure tests evaluate the brightness of the main subject and the dynamic interval, e.g. The ability to make the details visible in brilliant and dark areas of the image. The stability and temporal adaptation of the exposure are also analyzed.
The analysis of the color quality of the image examines the color rendering, the skin rendering of the skin, the white balance, the shading of the color, the stability of the white balance and its adaptation when the light is changing.

The plot tests analyze the level of details and the plot of the videos of real life, as well as the videos of the graphs recorded in the laboratory. Natural video recordings are visually evaluated, with particular attention to the level of details in the bright areas and in the dark. Objective measurements of images of graphs taken in various conditions from 1 to 1000 lux are performed. The graphs used are the DXOMark (DMC) and Dead Leaves graphic designer.

The noise tests analyze various attributes of noise such as intensity, chromaticity, wheat, structure, temporal aspects on video recording of real life and video of graphs taken in the laboratory. Natural videos are visually evaluated, with particular attention to noise in dark areas and high dynamic range conditions. Objective measurements are performed on the videos of the graphs recorded in various conditions from 1 to 1000 lux. The graphic designer used is the DXOMark visual noise diagram.

The evaluation of stabilization verifies the ability of the device to stabilize movies thanks to software or hardware technologies such as OIS, EIS or any other means. The evaluation examines the residual movement, the softness, the yellow artifacts and the blur of the residual movement on cases of use of walking and running in various lighting conditions. The video below is an extract of one of the tested scenes.

The artifacts are evaluated with MTF and store measurements on the SFR graphic designer in the laboratory, as well as measurements of the installment with frame using the universal led timer. Natural videos are visually evaluated by paying particular attention to artifacts such as aliasing, quantization, blocking and shift of shades, among others. The more serious and more frequent the artifact is, the greater the deduction of the point from the score. The main artifacts and the loss of corresponding points are listed below.