Mitsubishi Denki Kabushiki Kaisha

Kiyotaka Yamamoto

Hiroaki Sugiura

Tetsuya Kuno

Masaki Yamakawa

Akira Kanai

Masaharu Hayakawa

Masafumi Kodama

Shoichi Sugihara

Akiko Maeno

Junichiro Hayashi

Yoshikuni Nishimura

It is an object of the invention to measure the precise color characteristic of an image pickup machine and accurately reproduce a subject in an image display unit. A color characteristic measurement apparatus which has a test chart () as a subject of an image pickup machine (), a hole () made in the test chart (), a black box () placed on a rear face of the test chart () and formed on an inner surface in black, and a light output section () placed in the black box () at a position where the light output section () can be observed through the hole () from the outside.

Color characteristic measurement apparatus, color characteristic measurement method, and picked up image data storage medium

Color characteristic measuring apparatus and method, and storage medium of image pickup data

In a color image display system formed of a monochromatic CRT or like image display device (102) having a screen (103) for display of images and a rotary filter (106) comprising color filter sections (106R, 106G and 106B) of a plurality of colors; image signals are read from memories (130R, 130G, 130B) at a rate higher than they are written in the memories, so as to reduce flickers. The problem of passing of the reading address over the writing address is solved by reading the image signal of prominent color taking a period in which the passing over occurs. High frequency components of other color image signals are extracted and added to the image signal of each color to thereby enhance the definition of the picture.

Phase inversion control pulse generating circuit

A color image display system includes a monochromatic CRT or similar image display device which includes a screen for display of images and a rotary filter having filter sections of a plurality of colors. The system further includes memories for storing color image signals corresponding to each of the colors. A control circuit reads the color image signals from the memories at a higher rate than the color image signals are written into the memories to reduce image flickering. The reading operation, however, passes over the writing operation. Discontinuities caused by this passing over are reduced by reading a color image signal corresponding to a less prominent color during the passing over. Discontinuities are avoided by providing an additional memory in the system and alternately reading and writing between one of the first set of memories and the additional memory. The system also adds to each color image signal read from a memory the extracted high frequency components from the other color image signals to enhance picture definition.

Color image display device

Growing community of inventors

Hyogo, Japan

Kiyotaka Yamamoto