Apparatus and method for controlling image processing based on image quality and/or processing speed as control parameters

• US 6,025,929 A
• Filed: 06/16/1997
• Issued: 02/15/2000
• Est. Priority Date: 06/18/1996
• Status: Expired due to Term

• Current Assignee: Canon Finetech Incorporated (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamada, Satoru, Nakajima, Nobuyuki
• Primary Examiner(s): ROGERS, SCOTT A
• Application Number:
  US08/876,597
• Time in Patent Office: 974 Days
• Field of Search: 395/109, 395/112, 358/502, 358/501, 358/401, 358/296, 358/1.9, 358/1.13, 358/534, 358/298, 358/456, 358/504, 358/518, 358/519, 347/3, 347/5, 347/13, 347/15, 347/14, 347/9, 347/42, 347/43, 347/40
• US Class Current: 358/1.9
• CPC Class Codes: H04N 1/4015 of the reproducing head
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence

Abstract

Inputted image data is subjected to image processing by the matching unit 513, luminance-density conversion unit 514, input correction unit 515, masking unit 516, head shading (HS) processing unit 517, tone reproduction curve (TRC) processing unit 518 and binarize processing unit 519. The selecting unit 133 controls at least the on/off of the process operation of the HS processing unit 517 and a binarization method of the binarize processing unit 519, in accordance with an image process condition set by the setting unit 14. On account of the above, when an image is printed, it is possible to easily set image quality and processing speed that is suitable for the usage of an output image.

Claims

1. An image processing apparatus comprising:

first process means for performing color matching processing on inputted image data;

second process means for converting the image data outputted by said first process means into density image data;

third process means for performing masking processing on the density image data outputted by said second process means;

fourth process means for performing correction on the density image data outputted by said third process means in accordance with a pixel position;

quantization means for quantizing the density image data outputted by said fourth process means;

control means for controlling at least one of the process operations of said first to fourth process means and the quantization method performed by said quantization means; and

setting means for setting a level of at least one of image quality and image processing speed,

wherein said control means performs the control based on the image process condition set by said setting means.

2. The apparatus according to claim 1, wherein said setting means displays whether or not the processing by said first to fourth process means is to be executed and displays a quantization method to be performed by said quantization means, in accordance with the set level of image quality or image processing speed.

3. The apparatus according to claim 1, wherein said control means controls at least one of each of the process operation of said first to fourth process means and the quantization method performed by said quantization means, in a manner such that a combination of image processing corresponds to the set level of image quality or image processing speed set by said setting means.

4. The apparatus according to claim 1, further comprising determine means for determining a type of an image represented by the inputted image data,

wherein said control means controls at least one of each of the process operation of said first to fourth process means and the quantization method performed by said quantization means in accordance with the type determined by said determine means.

5. The apparatus according to claim 1, further comprising forming means for recording a visible image on a recording medium on the basis of the image data quantized by said quantization means.

6. The apparatus according to claim 5, wherein said forming means includes recording means having a plurality of recording elements arrayed substantially perpendicular to a conveying direction of the recording medium, each of said plurality of recording elements being driven on the basis of the quantized image data.

7. An image processing method comprising:

a first process step of performing color matching processing on inputted image data;

a second process step of converting the image data processed in said first process step into density image data;

a third process step of performing masking processing on the density image data processed in said second process step;

a fourth process step of performing correction on the density image data processed in said third process step in accordance with a pixel position;

a step of quantizing the density image data processed in said fourth process step;

a step of controlling at least one of the process operations in said first to fourth process steps and the quantization method performed in said quantizing step; and

a step of setting a level of at least one of image quality and image processing speed,

wherein the control in said controlling step is performed based on the image process condition set in said setting step.

8. A storage medium storing computer-readable program codes for performing image processing, comprising:

program codes for a first process step of performing color matching processing on inputted image data;

program codes for a second process step of converting the image data processed in said first process step into density image data;

program codes for a third process step of performing masking processing on the density image data processed in said second process step;

program codes for a fourth process step of performing correction on the density image data processed in said third process step in accordance with a pixel position;

program codes for a step of quantizing the density image data processed in said fourth process step;

program codes for a step of controlling at least one of the process operations in said first to fourth process steps and the quantization method performed in said quantizing step; and

program codes for a step of setting a level of at least one of image quality and image processing speed,

wherein the control in said controlling step is performed based on the image process condition set in said setting step.

9. An image processing apparatus for recording an image by utilizing a plurality of recording elements, comprising:

correcting means for correcting unevenness of the plurality of recording elements;

selecting means for selecting a half-tone processing method; and

setting means for setting correction operation of said correcting means in accordance with the selected half-tone processing method.

10. The apparatus according to claim 9, wherein the half-tone processing method includes error diffusion processing.

11. The apparatus according to claim 10, wherein, in a case where the error diffusion processing is selected as the half-tone processing method, said correcting means performs the correction.

12. The apparatus according to claim 9, wherein the half-tone processing method includes dither processing.

13. The apparatus according to claim 12, wherein, in a case where the dither processing is selected as the half-tone processing method, said correcting means does not perform the correction.

14. The apparatus according to claim 9, wherein each of the plurality of recording elements comprises a nozzle which discharges droplets.

15. The apparatus according to claim 14, wherein the droplets are discharged from the nozzle by film boiling.

16. The apparatus according to claim 9, wherein each of the plurality of recording elements comprises a heating unit of a thermal printhead.

17. An image processing method for recording an image, utilizing a plurality of recording elements, comprising the steps of:

correcting unevenness of the plurality of recording elements;

selecting a half-tone processing method; and

setting correction operation in said correcting step in accordance with the selected half-tone processing method.

18. The method according to claim 17, wherein the half-tone processing method includes error diffusion processing.

19. The method according to claim 18, wherein in a case where the error diffusion processing is selected as the half-tone processing method, the correction in said correcting step is performed.

20. The method according to claim 17, wherein said half-tone processing method includes dither processing.

21. The method according to claim 20, wherein in a case where the dither processing is selected as the half-tone processing method, the correction in said correcting step is not performed.

22. The method according to claim 17, wherein each of the plurality of recording elements is a nozzle which discharges droplets.

23. The method according to claim 22, wherein the droplets are discharged from the nozzle by film boiling.

24. The method according to claim 17, wherein each of the plurality of recording elements is a heating unit of a thermal printhead.

25. A storage medium storing computer-readable program codes for recording an image, utilizing a plurality of recording elements, comprising:

program codes a step of correcting unevenness of the plurality of recording elements;

program codes a step of selecting a half-tone processing method; and

program codes a step of setting correction operation in said correcting step in accordance with the selected half-tone processing method.