Apparatus and method of processing image
First Claim
1. A video processing apparatus, usable with a computer system comprising:
- a processor for performing logical operation, a first video memory for storing first video data, a display controller for generating a first analog video signal from said first video data stored in said first video memory and a first synchronizing signal for said first analog video signal, and display means for displaying a video image;
said video processing apparatus superimposing a moving video image represented by a second analog video signal upon at least part of a first video image represented by said first analog video signal, said video processing apparatus comprising;
an A-D converter for converting said second analog video signal representing a moving picture into second video data;
a second video memory for storing said second video data;
write control means for writing said second video data into said second video memory in synchronism with a second synchronizing signal for said second analog video signal;
a memory for storing color range data defining a predetermined range of chromaticity having an upper limit value and a lower limit value;
read control means for reading out said second video data from said second video memory in synchronism with said first synchronizing signal;
color comparator means for comparing said second video data read out by said read control means with said color range data to generate a color comparison signal indicating whether a value of said second video data is in said predefined range of chromaticity;
a D-A converter for converting said second video data read out by said read control means into a third analog video signal representing a moving picture in synchronism with said first synchronizing signal; and
a video switch for selecting one of said first analog video signal and said third analog video signal in response to said color comparison signal, and outputting said selected video signal to said display means to display a composed image in which the moving picture represented by said third analog video signal is superimposed in the first video image represented by said first analog video signal.
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Abstract
A reference value memory circuit 552 in a video switch control circuit 550 stores upper threshold values DU and lower threshold values DL of respective colors defining a predetermined range of chromaticity. A color comparator circuit 554 compares these upper threshold values DU and the lower threshold values DL with a second video signal LSMEM. When a color represented by the second video signal is within the predetermined range of chromaticity, a color comparison signal S1, which is an output of the color comparator circuit 554, becomes at H level, while the color comparison signal S1 becomes at L level when the color is out of the predetermined range of chromaticity. A selection signal S2 is generated according to the color comparison signal S1 and a switcher signal CNT. A video switch 510 selects one of a first video signal LSPC output from a computer and a second video signal LSDA output from a video memory 310 in response to the selection signal S2. As a result, only a desirable portion of the second video image is superimposed over the first video image.
22 Citations
21 Claims
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1. A video processing apparatus, usable with a computer system comprising:
- a processor for performing logical operation, a first video memory for storing first video data, a display controller for generating a first analog video signal from said first video data stored in said first video memory and a first synchronizing signal for said first analog video signal, and display means for displaying a video image;
said video processing apparatus superimposing a moving video image represented by a second analog video signal upon at least part of a first video image represented by said first analog video signal, said video processing apparatus comprising;an A-D converter for converting said second analog video signal representing a moving picture into second video data; a second video memory for storing said second video data; write control means for writing said second video data into said second video memory in synchronism with a second synchronizing signal for said second analog video signal; a memory for storing color range data defining a predetermined range of chromaticity having an upper limit value and a lower limit value; read control means for reading out said second video data from said second video memory in synchronism with said first synchronizing signal; color comparator means for comparing said second video data read out by said read control means with said color range data to generate a color comparison signal indicating whether a value of said second video data is in said predefined range of chromaticity; a D-A converter for converting said second video data read out by said read control means into a third analog video signal representing a moving picture in synchronism with said first synchronizing signal; and a video switch for selecting one of said first analog video signal and said third analog video signal in response to said color comparison signal, and outputting said selected video signal to said display means to display a composed image in which the moving picture represented by said third analog video signal is superimposed in the first video image represented by said first analog video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a processor for performing logical operation, a first video memory for storing first video data, a display controller for generating a first analog video signal from said first video data stored in said first video memory and a first synchronizing signal for said first analog video signal, and display means for displaying a video image;
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11. A computer system comprising:
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a processor for performing logical operation, a first video memory for storing first video data; a display controller for generating a first analog video signal from said first video data stored in said first video memory and a first synchronizing signal for said first analog video signal; display means for displaying a video image; and a video processing apparatus superimposing a moving video image represented by a second analog video signal upon at least part of a first video image represented by said first analog video signal comprising; an A-D converter for converting said second analog video signal representing a moving picture into second video data; a second video memory for storing said second video data; write control means for writing said second video data into said second video memory in synchronism with a second synchronizing signal for said second analog video signal; a memory for storing color range data defining a predetermined range of chromaticity having an upper limit value and a lower limit value; read control means for reading out said second video data from said second video memory in synchronism with said first synchronizing signal; color comparator means for comparing said second video data read out by said read control means with said color range data to generate a color comparison signal indicating whether a value of said second video data is in said predefined range of chromaticity; a D-A converter for converting said second video data read out by said read control means into a third analog video signal representing a moving picture in synchronism with said first synchronizing signal; and a video switch for selecting one of said first analog video signal and said third analog video signal in response to said color comparison signal, and outputting said selected video signal to said display means to display a composed image in which the moving picture represented by said third analog video signal is superimposed in the first video image represented by said first analog video signal.
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12. A video processing method, usable with a computer system comprising:
- a processor for performing logical operation, a first video memory for storing first video data, a display controller for generating a first video signal from said first video data stored in said first video memory and a first synchronizing signal for said first analog video signal, display means for displaying a video image, and a video processing apparatus superimposing a moving video image represented by a second analog video signal upon at least part of a first video image represented by said first analog video signal, said video processing method comprising the steps of;
(a) converting said second analog video signal representing a moving picture into second video data; (b) storing said second video data in a second video memory; (c) writing said second video data into said second video memory in synchronism with a second synchronizing signal for said second analog video signal; (d) reading out said second video data from said second video memory in synchronism with said first synchronizing signal by read control means; (e) comparing said second video data read out by said read control means with a color range data defining a predetermined range of chromaticity having an upper limit value and a lower limit value, to thereby generate a color comparison signal indicating whether a value of said second video data is in said predetermined range of chromaticity; and (f) converting said second video data read out by said read control means into a third analog video signal representing a moving picture in synchronism with said first synchronizing signal; and (g) selecting one of said first analog video signal and said third analog video signal in response to said color comparison signal, and outputting said selected video signal to said display means to display a composed image in which the moving picture represented by said third analog video signal is superimposed in the first video image represented by said first analog video signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
- a processor for performing logical operation, a first video memory for storing first video data, a display controller for generating a first video signal from said first video data stored in said first video memory and a first synchronizing signal for said first analog video signal, display means for displaying a video image, and a video processing apparatus superimposing a moving video image represented by a second analog video signal upon at least part of a first video image represented by said first analog video signal, said video processing method comprising the steps of;
Specification