Showing papers on "Test card published in 1990"

Study of estimation of color recognition on the dentist. On the ability of subjects to discriminate color in terms of hue, value and chroma.

Abstract: The tooth crown color space model was manufactured and the improvement of the color representation and communication on the dental clinic have been trying. The study of color discrimination by dentist and student viewing with the use of tooth crown color chips reported here in basic knowledge on the color sensitivity of human eye. The test card were 55 x 90 mm in size and the color chip, 5 x 10 mm. The paired color chips were placed on the test card to have a 2 mm distance between them. Color difference of two tooth crown color chips on the test cards was 3.5 (delta E*ab), the combination of hue, value and chroma was constant of all cards. The subjects were 22 people, 6 dentists and 16 dental school students with normal color sensibility. In proportion of method of comparison for surface color (JIS Z 8723), the subject observed the test card which were different of hue, value and chroma on the their naked-eye, were investigated to evaluate their judgement of the test cards. The following results were obtained. The standard of judgment for the color discrimination was made firstly in terms of hue, secondly in terms of value, and thirdly in terms of chroma.

Generating method of color television circular picture test card

Abstract: The present invention relates to a generating method of circular picture testing card for color TV. It mainly consists of a read only memory, an image-time counter and an image code latch. It is mainly characterized by that the read only memory stores the image code and time of color picture within the testing card and feeds them into the image code latch and image-time counter respectively, and thus two essential factors of color television: color and time can be accurately determined, therefore the present invention has the advantages of simple structure, good performance and low cost.