Image signal processing apparatus for use in color image reproduction

• US 5,028,991 A
• Filed: 08/30/1989
• Issued: 07/02/1991
• Est. Priority Date: 08/30/1988
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Koike, Yuzo, Yamamoto, Naofumi, Hirahara, Shuzo, Sekizawa, Hidekazu, Higuchi, Kazuhiko, Saito, Tutomu, Iwamoto, Akito
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): LEE, MICHAEL
• Application Number:
  US07/400,925
• Time in Patent Office: 671 Days
• Field of Search: 358/80, 358/75, 358/77, 358/457, 358/443, 358/447, 355/38
• US Class Current: 358/537
• CPC Class Codes: H04N 1/3872 Repositioning or masking
• CPC Class Codes: H04N 1/58 Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction H04N1/62 takes precedence

Abstract

A color multi-function type copying machine is disclosed which includes an image input unit for optically sensing an input image and generating an image signal. A function memory stores an ink color used in a color frame to be written in the input image in order to designate its partial image region and a specific image edit function assigned to the ink color and desired to be executed by an operator so that the ink color and the specific image edit function can be rewritten. When a closed loop-like color frame of a selected color is written in the input image, a color frame region detecting unit detects a shape and a color of the color frame. In response to the detection result, the memory is accessed to determine an image edit function corresponding to a first selected ink color of the detected color frame. A color edit unit executes one or a plurality of image signal processing corresponding to the determined image edit function for the input image signal. The edited image signal is supplied to a color printing unit via a signal processing unit and is reproduced therein.

Claims

1. A color image signal processing apparatus for use in an image reproduction system, said apparatus comprising:

(a) image input means for optically sensing an image on input paper and generating an electrical image signal;

(b) memory means for storing in a one-to-one correspondence manner colors used in color frames written in the input image so as to designate a partial image region thereof and specific image edit functions which are assigned to the frame colors and desired to be executed by an operator;

(c) detecting means for detecting, when a closed loop-shaped frame of a selected color is written in the input image, a shape and color of the color frame in response to the image signal and for generating a detection result signal;

(d) function determining means, connected to said detecting means and said memory means, for accessing said memory means in response to the detection result signal to determine an image edit function corresponding to a first selected ink color of the detected color frame, and for generating an operation mode set signal;

(e) signal processing means, connected to said function determining means, for executing an image signal processing corresponding to the image edit function in response to the operation mode set signal, thereby to generate an edited image signal; and

(f) image output means, connected to said signal processing means, for generating an image reproduced in response to the edited image signal;

wherein said memory means stores image edit functions and edit parameters selected by the operator as specific image edit function designation data.

2. The apparatus according to claim 1, wherein, when another image edit function data different from the specific image edit function data is assigned to the ink color of the color frame, said memory means updates stored contents thereof to store said another image edit function data.

3. The apparatus according to claim 2, further comprising:

(g) edit function registering means for optically sensing an edit function registration sheet to read color marks written thereon and generating electrical edit function registration data, thereby allowing independent registration of an image edit function desired to be executed by the operator, said edit function registration data being supplied to said memory means and stored therein.

4. The apparatus according to claim 3, wherein said memory means stores a first ink color used in a first color frame to be written on first input paper so as to designate a source image region, a second ink color used in a second color frame to be written on second input paper so as to designate a partial image region of the second input paper to function as a target image region in which the source image is to be merged, and edit function designation data for image merging synthesis between the source image region and the target region.

5. The apparatus according to claim 3, wherein said image output means outputs said edit function registration data.

6. The apparatus according to claim 5, wherein said edit function registration sheet is positioned in adjacent to a non-image region of the input paper, said sheet having a data registration area which is substantially same in width as said non-image region of said input paper.

7. A color image signal processing apparatus for use in an image reproduction system, said apparatus comprising:

(a) image input means for optically sensing an input image and generating an electrical image signal;

(b) first converting means, connected to said input means, for color-converting the image signal to generate a quantized color code signal;

(c) signal processing means for receiving the color code signal, for performing signal processing including at least one of image correction processing and image edit processing for the signal, and for generating a processed color code signal;

(d) second converting means, connected to said signal processing means, for converting the processed color code signal into an ink amount signal by using a selected conversion method; and

(e) image output means, connected to said second converting means, for reproducing the input image and generating a reproduced image in response to the ink amount signal;

wherein said signal processing means comprises correcting means, connected to said image input means and said first converting means, for extracting a high-frequency component from the color image signal and performing high-frequency emphasis correction for the color code signal in accordance with the extracted high-frequency component.

8. The apparatus according to claim 7 wherein said signal processing means comprises:

color region integrating means, connected to said first converting means, for calculating a color difference between different neighboring image regions of the input image in response to the color code signal, and when the color difference is smaller than a preset reference level, integrating the image regions into one region.

9. The apparatus according to claim 7, wherein said signal processing means comprises:

correcting means, connected to said image input means and said first converting means, for extracting a high-frequency component from the color image signal, performing high-frequency emphasis correction for the color code signal in accordance with the high-frequency component, and generating a high-frequency-emphasized color code signal; and

color region integrating means, connected to said correcting means, for calculating a color difference between different neighboring image regions of the input image in response to the high-frequency-emphasized color code signal, and when the color difference is smaller than a reference level preset to correspond to a degree of color variation which tends to occur in an input image, integrating the image regions into one color region so as to have the same color code.

10. A color image signal processing apparatus for use in an image reproduction system, said apparatus comprising:

(a) image input means for optically sensing an input image in a raster scanning manner, and for generating an electrical image signal having raster components, the input image including an original image and a color frame written in the input image so as to designate a specific region of the original image;

(b) color converting means, connected to said input means, for color-converting the image signal to generate a quantized color code signal;

(c) identifying means, connected to said converting means, for adding, in response to the color code signal, an attribute having one of a first level representing a frame and a second level representing a background, and for identifying a frame portion and a background portion of pixels of a current raster by using attribute information of a previous raster adjacent to a current raster, thereby detecting a region designated by the color frame of the input image as a frame-in region and generating a frame-in region identification signal;

(d) editing means, connected to said converting mean and said identifying means, for performing editing desired by an operator for the specific region of the input image and generating an edited image signal in response to the frame-in region identification signal; and

(e) image output means, connected to said editing means, for reproducing the input image and generating a reproduced image in response to the edited image signal;

wherein said identifying means comprises level determining means for dividing a relative distribution relationship of the first and second levels between the current raster and the previous raster into a selected number of state patterns, and when one of the state patterns is produced, executing level assignment processing to be executed for each of the pixels of the current raster.

11. The apparatus according to claim 10, wherein said level determining means divides each of the current and previous rasters into a first pixel group of a series of pixels having the first level and a second pixel group of a series of pixels having the second level, determining a relative positional relationship between the first and second pixel groups in the current and previous rasters, and performing level assignment processing corresponding to a determination result for a certain pixel group to be determined of the current raster.

12. The apparatus according to claim 11, further comprising:

(f) thin-out means, connected to said color converting means and said identifying means, for performing thin-out processing of the color code signal in units of a selected number of pixels in such a manner that a specific type of color pixels perferentially remain, and for generating a color code signal from which a reduced number of bits are thinned out, the thin-out signal being supplied to said identifying means.

13. A color image signal processing apparatus for use in an image reproduction system, said apparatus comprising:

(a) image input means for optically sensing an input image in a raster scanning manner and for generating an electrical image signal having raster components, the input image including an original image and a color frame written in the input image so as to designate a specific region of the original image;

(b) color converting means, connected to said input means, for color-converting the image signal to generate a quantized color code signal;

(c) frame-in region detecting means, connected to said converting means, for tracing, in response to the color code signal, a selected route in a reverse order to distinguish frame pixels located on the color frame from remaining pixels corresponding to background pixels, for forming a hierarchical structure representing a relative distribution of the pixels, referring to a color code of a continuous frame pixel of a certain background portion in the hierarchical structure and determining an attribute of the certain background pixels, and for detecting the specific region of the input image on the basis of the determined attribute, thereby generating a frame-in region detection signal;

(d) editing means, connected to said converting means and said frame-in region detecting means, for performing edition desired by an operator for the specific region of the input image and generating an edited image signal in response to the frame-in region identification signal; and

(e) image output means, connected to said editing means, for reproducing the input image and generating a reproduced image in response to the edited image signal;

wherein said frame-in region detecting means comprises memory means for storing attributes of specific pixels, which may include other background and frame pixels, passed during tracing to the certain background pixel along the selected route as history information together with the attribute determined for the certain background pixel portion, the history information being used in attribute determination of another pixel adjacent to the certain background pixel portion.

14. The apparatus according to claim 13, wherein, when another background pixel portion is produced next to the certain background pixel portion so as to sandwich a frame pixel portion therebetween in the hierarchical structure, said frame-in region detecting means shifts the stored contents of said memory means in a selected direction in said memory means to detect an attribute appearing in a specific memory address of said memory means and assigns the attribute as an attribute of the produced background pixel portion.

15. The apparatus according to claim 14, wherein said memory means includes a stack memory.