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US 4,283,137 AGranted
Image scanning system
AssigneeCanon Kabushiki Kaisha
InventorsTokuichi Tsunekawa, Makoto Masunaga, Kazuya Hosoe, Yukichi Niwa, Mitsutoshi Owada, Noriyuki Asano
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Abstract
This specification discloses an image scanning system in which an object image formed by an optical system is electrically scanned by utilization of a photosensor array device and the image scanning output then obtained is quantized to thereby provide quantized image data. According to the improvement of the present invention, there are obtained two different quantized image data, namely, first quantized image data quantized by a voltage level determined on the basis of the image scanning output from the sensor device and second quantized image data quantized by a predetermined fixed voltage level.
Claims28
An image scanning system comprising:
- (A) image scanning means arranged to receive an image for providing scanned image signal of the image;
- (B) means for providing a first quantization standard which is variable in accordance with the change in a specific level of said scanned image signal;
- (C) means for providing a fixed second quantization standard;
- and
- (D) quantization means receiving said scanned image signal to provide quantized data on said image, said quantization means providing first quantized data by quantizing the image signal with said first quantization standard provided by said first quantization standard provision means and providing second quantized data by quantizing the image signal with said second quantization standard provided by said second quantization standard provision means.
2 more elements
An apparatus for detecting the range of an object, comprising:
- (A) image scanning means adapted to receive first and second detection field images containing the image of said object along different sight lines to produce an electrical signal on each image element of said first and second detection field images;
- (B) detection means for detecting a specific level of the image element signals on said first detection field image;
- (C) first quantization standard provision means for providing a first quantization standard on the basis of the specific level detected by said detection means;
- (D) second quantization standard provision means for providing a fixed second quantization standard;
- (E) quantization means for providing quantized data on the image elements of said detection field images, said quantization means providing first quantized data by quantizing the image element signals with said first quantization standard provided by said first quantization standard provision means and providing second quantized data by quantizing the image element signals with said second quantization standard provided by said second quantization standard provision means;
- (F) discrimination means for discriminating whether or not the specific level detected by said detection means is within a predetermined range of levels, said discrimination means producing a first indication when the specific level is within said predetermined range and producing a second indication when the specific level deviates from said predetermined range;
- (G) selection means responsive to said first and second indications produced by said discrimination means for selecting one of said first and second quantized data provided by said quantization means, said selection means selecting said first quantized data in response to said first indication and selecting said second quantized data in response to said second indication;
- (H) storing means for storing the selected quantized data selected by said selection means, said storing means storing at least the quantized data on M successive image elements of said first detection field image and N, being greater than M, successive image elements of the second detection field image;
- and
- (I) location detection means for detecting, on the basis of the stored quantized data stored in said storing means, a location, within said second detection field image, of one set of M successive image elements which is most similar to the M successive image elements of said first detection field image, said location being indicative of the range of said object.
7 more elements
An image comparison system for detecting a relative positional difference between two images each having an associated image portion, comprising:
- (A) image scanning means for scanning the two images and for producing scanned image signals on the images;
- (B) detection means for detecting a specific level of the scanned image signal on one of the two images;
- (C) quantization means for quantizing the scanned image signals produced by said image scanning means and for providing quantized data on the images, said quantization means providing first quantized data by quantizing the scanned signals with a first quantization standard determined on the basis of said specific level detected by said detection means and providing second quantized data by quantizing the scanned signals with a fixed second quantization standard;
- (D) discrimination means for discriminating whether or not the specific level detected by said detection means is within a predetermined range of levels, said discrimination means producing a first indication when the specific level is within said predetermined range and producing a second indication when the specific level deviates from said predetermined range;
- (E) selection means responsive to said first and second indications produced by said discrimination means for selecting one of said first and second quantized data provided by said quantization means, said selection means selecting said first quantized data in response to said first indication and selecting said second quantized data in response to said second indication;
- and
- (F) data processing means for detecting, on the basis of the selected quantized data selected by said selection means, the relative positional difference between said associated image portions of the two images.
4 more elements
Dependencies are inferred from the claim text.