Interactive real-time video processor with zoom pan and scroll capability
First Claim
1. In an interactive video processor for processing image data corresponding to video scan lines derived form scanning an image, said processor comprising:
- sampling means for sampling the image data,storing means for storing the sampled image data, at a given rate of storage, in successive memory addresses of said storing means,retrieving means for retrieving the stored image data,processing means for processing the retrieved image data, anddisplay means for displaying the image originally scanned;
the improvement comprising pan circuit means for delaying the storage of the sampled image data relative to the start of each video scan line by an amount of time appropriate to achieve a desired horizontal displacement of the displayed image, and scroll circuit means for initiating data retrieval at a memory address appropriate to the video scan line which is to appear at the top of the display of the image so as to achieve vertical displacement of the displayed image; and
wherein said retrieving means retrieves the image data at a rate equal to a predetermined fraction of the rate of storage of the image data, and said display means displays the image data corresponding to each video scan line twice so as to produce a display of the image which is effectively magnified by a predetermined factor.
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Abstract
A video processor used in conjunction with commercial video products provides realistic visual imagery and a dynamic interactive capability. The outputs from three video digitizers, one for each of the primary colours red, green and blue (RGB) of a composite video signal, are stored in high speed, serial access memory devices. The output of the memory devices is converted to an analog signal for an ordinary RGB monitor. Image content can be transformed in real-time via microprocessor control of selected data in the memory devices, encoding and retrieval circuits permitting a portion of the original video signal to completely fill a normal RGB monitor. As well, computer generated imagery can be superimposed upon the video background and the background can be altered to achieve special visual effects.
77 Citations
17 Claims
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1. In an interactive video processor for processing image data corresponding to video scan lines derived form scanning an image, said processor comprising:
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sampling means for sampling the image data, storing means for storing the sampled image data, at a given rate of storage, in successive memory addresses of said storing means, retrieving means for retrieving the stored image data, processing means for processing the retrieved image data, and display means for displaying the image originally scanned; the improvement comprising pan circuit means for delaying the storage of the sampled image data relative to the start of each video scan line by an amount of time appropriate to achieve a desired horizontal displacement of the displayed image, and scroll circuit means for initiating data retrieval at a memory address appropriate to the video scan line which is to appear at the top of the display of the image so as to achieve vertical displacement of the displayed image; and wherein said retrieving means retrieves the image data at a rate equal to a predetermined fraction of the rate of storage of the image data, and said display means displays the image data corresponding to each video scan line twice so as to produce a display of the image which is effectively magnified by a predetermined factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification