The HDTV universal test card TE117 is designed for rapid visual evaluation of the image transmission characteristics of high-definition television cameras.

Introduction to HDTV Universal Test Card

In the center of the gray background area (D=0.75; transmittance=18%) of the test card, there is a white circle with grayscale bars and a resolution wedge image inside.

There are four small circles with resolution wedge plots on either side of the large white circle in the center.

16: The format of 9 is indicated by four hollow arrows located on the horizontal and vertical centerline. In addition, the four hollow arrows located close to the four circles on the upper and lower edges of the image indicate a 4:3 format. Therefore, this test card can also be used to test 4:3 cameras.

Instructions for using HDTV universal test card

There are 11 degree grayscale bars in each of the four directions within the white circle. The grayscale of these four gray bars gradually increases in a linear equal amount from D=0.15 to D=1.65, which can be used to check the halftone reproduction performance of high-definition cameras. Due to the surrounding white area, the inspection results will be very reliable.

All frequency values on the test card are represented in cph (the number of lines per unit height). In the central circle, three wedge-shaped graphs with different frequencies are arranged horizontally and vertically. Their frequencies range from 100 to 250, 200 to 500, 400 to 1000 cph, respectively. Additionally, the two resolution wedge plots intersecting at a 45 degree angle generate frequencies ranging from 200 to 5000 cph.

There are four line grating squares on the center and left and right sides of the test card, with tilt angles of 0 °, 45 °, 90 °, and 135 °, respectively. They generated a frequency of 200 cph. The line grating grids with tilt angles of 45 ° and 135 ° generate different frequencies (141.4 cph) in the horizontal and vertical directions (due to their inclination). The eight small circles outside the central circle are arranged in 16:9 and 4:3 formats, respectively. Larger circles have a cross shaped resolution wedge diagram. The small circle inside the circle is designed to indicate the resolution in both horizontal and vertical directions, and can also be used to detect geometric distortions. The resolution levels tested on this card are 200500660725 and 800cph.

The four peripheral circles located in the four corners have longer resolution wedge plots, with their intersections at 500 cph and marked with scales ranging from 200 to 800 cph.

In the white and gray areas in the middle of the test card, there are seven bar element diagrams arranged, with lengths of 1 (=half the height of the image), 2, 4, 8, 16, 32, and 64 cph in sequence. On the left side of the vertical grayscale bar on the right, there are 5 short bar elements, which are 100, 300, 500, 700, and 900 cph respectively.