Showing papers on "Channel (digital image) published in 1985"

Video editing systems with allowable range for key signal set by detecting the range in a selected area

Abstract: A system for combining two or more video signal inputs using a chrome key like system. The keying is not done to one color, such as saturated blue, but to any color within a range. One of the video signal inputs (1) is frozen and appears as a still picture on a display (6). Graphic means (16) are used to define an area of the picture and the maximum and minimum values of the color components of the signals in that area are detected. Whenever a signal with components falling within the detected range is present in a switch (14) it operates to select a channel for output. This works to build up a composite picture.

Enhanced sensitivity color video camera with reduced red component in second luminance signal

Abstract: A color video camera uses an infrared cut-off filter, a complementary filter and a solid state image pick-up device. The infrared cut-off filter cuts off near infrared light of image above a wavelength λc, which is set in the range of 670 nm≦λc≦780 nm. A color sampling/generating circuit has a matrix circuit connected to the solid state image pick-up device for providing a first luminance signal, a second luminance signal, a red channel signal and a blue channel signal. The second luminance signal is used for producing a red color difference signal and a blue color difference signal by using the red channel signal and the blue channel signal in a processing circuit. In the matrix circuit, matrix coefficients for producing the second luminance signal are set to reduce the red component of the second luminance signal. Further, the red color difference signal below a predetermined value is extracted and added to the first luminance signal to reduce the red component of the first luminance signal.

Editing device for copy image

Abstract: PURPOSE:To perform plate making operation such as cropping processing through hardware, i.e. with a circuit of relatively simple constitution by setting previously coordinate values on a recording film required for the plate making operation together with the number of each color original image. CONSTITUTION:Position information on a recording film which indicates an area which is treated by necessary cropping processing, border processing, flat mesh mask processing, gas mask processing, etc., is set for each color plate signal obtained by making a photoelectric scan on a color original image in the order of scanning lines. An editing device consists of data editing circuits 29Y-29K for respective color plate signals Y, M, C, and K, a channel selector 30, and a control signal processing part. For example, when the color plate signal Y is processed, a data register RYB in the Y data editing circuit 29Y holds Y signal dot area rate data for a border, RYT1-RYTn hold data for flat mesh mask formation, and RYC holds data for cut mask formation. The cropping processing, border processing, flat mesh mask processing, and cut mask processing of a copy image on a recording side are carried out successively corresponding to the photoelectric scan on each original image on a scanning side.

Data transfer method

Abstract: PURPOSE:To reduce data transfer amount, channel load and capacity of image buffer and also to improve remarkably the throughput by extracting properly only an image data required for processing of a pattern at a channel and transferring it to a communication controller. CONSTITUTION:The image pattern data 8 in a central processing unit 7 is provided additionally with a synchronizing code EOL representing the section of a line to a data compress-coded at each line and consists of one page's share data of a limited size such as size A4 or B4. A channel 9 stores the number of lines form the head to the n-th line of the image pattern data and the number of lines from the n-th line to the (n+m)-th line, calculates the location of the n-th line by detecting and counting the synchronizing code EOL added to the end of data at each line, throws away the data including the synchronizing code EOL up to the (n-1)-th line entirely and transfers the data from the n-th line to the (n+m)-th line to a communication controller 6. The communication controller 6 expands the image pattern data, converts it into a normal image data and stores the result to an image buffer 11.

Color video camera

Abstract: A color video camera using an infrared cut-off filter, a complimentary filter and a solid state image pick-up device is disclosed, the infrared cut-off filter cuts off near infrared light of image above a wavelength \c, which is set in the range of 670nm s λc ≦ 780 nm. A color sampling/generating circuit (4) has a matrix circuit connected to the solid state image pick-up device (3) for providing a first luminance signal, a second luminance signal, a red channel signal and a blue channel signal. The second luminance signal is used for producing a red color difference signal a blue color difference signal using the red channel signal and the blue channel signal in a processing circuit. In the matrix circuit, matrix coefficients for producing the second luminance signal are set to reduce the red component of the second luminance signal. Further, the red color difference signal below a predetermined value is extracted and added to the first luminance signal to reduce the red component of the first luminance signal.

Progressive scan television system employing a comb filter

Abstract: A flat-field television image having reduced visibility of horizontal scan lines is generated by receiving first and second fields of interlaced video and progressively generating a scanned image within a time for one incoming field. The progressive scanned image is formed from "real" and interpolated lines of luminance. In this arrangement the interpolated line is formed by weighting samples from time-successive lines. To improve the vertical detail of a progressively scanned image vertical detail information which may be obtained from the chrominance channel is combined with both "real" and interpolated lines, or one to the exclusion of the other, to enhance the image displayed.

Vegetation change detection from NOAA polar orbiting satellites

Abstract: A Method is proposed for detecting vegetation change using global area coverage data from the NOAA-7 Advanced Very High Resolution Radiometer. Other methods of vegetation change detection, such as baseline images, are discussed, but not demonstrated. Vegetation Change Detection Images are produced by combining three separate weekly composites of Channel 2 minus Channel 1 AVHRR data. This compositing method takes the highest value of the differenced data for each week period and each pixel location. Three such weekly composites red imaged by individual red, green and blue CRT color guns respectively and then combined to form a color composite. The Vegetation Change Detection Image has 20 km resolution. It can be used to show an entire continent on a single image when the data point to CRT pixel ratio is 1:1. The vector vegetation change (magnitude and direction) is depicted by the color pattern resulting from the relative amount of red, green and blue placed in the pixel due to the individual weekly color composites. If there is no greenness change at a pixel location the amount of red, green and blue will be the same and a gray scale color results. The VCDI could provide a timely “first alert” for identifying regional and global agricultural changes.

An image compression survey and algorithm switching based on scene activity

Abstract: Data compression techniques are presented. A description of these techniques is provided along with a performance evaluation. The complexity of the hardware resulting from their implementation is also addressed. The compression effect on channel distortion and the applicability of these algorithms to real-time processing are presented. Also included is a proposed new direction for an adaptive compression technique for real-time processing.