The Institute of Image Information and Television Engineers (ITE) has developed a range of 2K/4K/8K UHD, wide color gamut standard images highly suitable for the research and development of display equipment.
These standard images are available in 12/10 bits color depth and comply with the ITU-R BT.2020 image format for static UHD and wide color gamut displays.
A vast number of books are filled in bookshelves spanning the entire wall of a large room. The image is taken such that the books’ spines can be seen, which makes it suitable for directly evaluating the resolution of the display equipment. Also, because there are spot illuminations in addition to general illumination, the luminosity in each region of the shelves differs. Thus, the image can be also used to evaluate the display equipment’s presentation of dark areas through readability in those areas. The image is also useful for evaluating the effects of degradation such as blurriness, aliasing, ringing, and quantization distortion, which noticeably appears in the lettering areas.
Various kinds of antique music boxes are placed in a room with wooden floor. The image is taken with illumination coming from the ceiling and the rear wall. Because the image is captured in high resolution, it contains not only the texture of decorative engravings on the music boxes and that of the antique dolls and works of art, but even the instruments’ wood grain and fine scratches. Thus, you can use this image to test the resolution of the display equipment and compare image quality between various formats. The image is also useful for evaluating black reproducibility using the wood grain in dark areas. Because several letters are engraved on the music boxes, the image can also be used to assess readability.
This is an image of a moss-covered garden. Because entire composition has depth and contains detailed textures, it is well-suited for evaluating the sense of realness and immersion based on the screen size and image resolution. Elements in the image such as the moss’s sharpness and tones, the textures of the rock and tree surfaces, and the edges of leaves and grass are also useful for evaluating degradation such as blurriness, aliasing, ringing, and quantization distortion due to image processing. The veins on the surface of leaves, as well as moss and leaves in dark areas such as shades cast by rocks, are also well-suited for assessing degradation due to image encoding and other processing.
This is an image of a kara-ori (“Chinese weave”) kimono (Noh costume) with complex patterns. The detailed texture of the fabric and the colorful design of the kimono are well-suited for assessing the display equipment’s resolution and evaluating color tones. These features are also useful for examining degradation in image encoding and other image processing. Because the image includes a painted pine tree and wood grains of the Noh stage in the background, it is also suited for evaluating the sensation of reality, and can be used to compare image quality due to differences in image formats.
This image captures stained glass that includes detailed parts. Because it also includes detailed textures along with light and dark areas, the image is well-suited for evaluating degradation of details due to image processing and image encoding, as well as corruption of gradation and color tones. It is also useful for reproducing wide-color gamut, including the stained glass’s red, yellow, green, and cyan, and for evaluating the columns’ black reproducibility. Because the image also contains detailed lettering, it can be used to evaluate readability and degradation of characters due to resolution conversion and image processing.
This image of butterfly specimens contains extremely fine textures. The butterflies’ delicate scales are captured by the wide color gamut, which makes the image useful for confirming resolution and the color system. The texture of the scales are well-suited for evaluating viewing conditions, displays, and change in resolution due to image format conversion and other processing. In the background, the butterflies’ shadows and dust are shown at extremely low signal levels, which makes differences in the reproduction conditions of black levels visible.
This image captures a model ship, flowers, and a doll against a blue background. It is particularly well-suited for assessing chroma key processing. Because a shallow depth of field was used in photographing the image, various blurry edges are included. The image also contains objects that make chroma key processing difficult, such as the glass filled with water and the doll’s lace. All this makes the image especially useful for evaluating the performance of chroma key processing.
This image captures the emerald green characteristic of seas with coral reefs. Because almost all colors of the sea lie outside HDTV’s color gamut, the image is well-suited for evaluating wide color gamut and tones. The shaded area in the lower right corner of the image contrasts with the sunlit area, and can be used to evaluate the presentation of dark areas by the display device. In addition, the brightness at the junction of the sky and the sea varies greatly, making it suitable for evaluating the display's local dimming characteristics.
This is a wide-color-gamut image in which numerous multi-colored flowers are laid out without any gaps. It contains mainly colors outside HDTV’s color gamut. The image is well-suited for evaluating reproduction of wide-color gamut and assessing tones. The contrast between the shaded area in the lower right corner of the image and the flowers can be used to evaluate the display's presentation of dark areas. The detailed texture of the petals is also suitable for evaluating the capacity for lifelike image quality of the display's image size and resolution.
This is an image of a ship on a sunny day. It can be used to evaluate the sensation of presence based on differences in screen size and image formats between 4K and 8K. The ship’s multiple masts and taut ropes are useful for assessing degradation of image quality, such as blurriness, aliasing, ringing, and quantization distortion, that occurs as a result of image encoding. The image is also well-suited for appraising gradation of the blue sky in the background. Because it is a single-shot image, please be aware of false colors and color bleeding that occurs as a result of a noise reduction filter used to suppress false colors.
Each test image is designed for different test items. The following is an overview of the images and their suitability for evaluation:
|Image||Resolution||Gray scale reproduction||Color reproduction||Degradation due to processing||Readability||Sensation of presence||Wide color gamut|
● Especially applicable | ○ Applicable
Reference: The Institute of Image Information and Television Engineers
The ITE has released 10 images for 8K, 4K, and 2K resolutions. The following is an overview of Chroma's test equipment models and their supported resolutions:
● Single module fully supported | ○ Supported under restricted conditions (A223803: VGA supports 4K, YPbPr supports 2K)