Abstract: A non-transitory computer readable storage medium storing computer readable instructions executable by a computer is provided. The computer readable instructions cause the computer to obtain first image data composing a first image and second image data composing a second image, specify first edge pixels in the first image using the first image and second edge pixels in the second image using the second image data, determine positional relation between the first image and the second image in a first degree of accuracy, based on positional relation between the first edge pixels and the second edge pixels, determine first usable pixels among the first edge pixels and the second usable pixels among the second edge pixels, and using the first usable pixels and the second usable pixels, determine positional relation between the first image and the second image in a second degree of accuracy being higher than the first degree.

Abstract: In an image forming device, a controller converts continuous-tone image data to raster image data using a dither matrix. The continuous-tone image data includes pixels each has a tone value. The raster image data is binary image data corresponding to exposure areas. The dither matrix includes threshold values. The dither matrix is configured so that as an exposure area percentage of the raster image data increases, growth of the exposure area progresses according to a growth process including: a stage at which an exposure area extends in a predetermined screen direction from an isolated exposure area to connect with another isolated exposure area; and a stage at which after the isolated exposure area connects with another isolated exposure area, the exposure area extends in a crossing direction crossing the predetermined screen direction. The controller controls the exposure device to expose the photosensitive drum based on the raster image data.

Abstract: A set of program instructions causes a computer to perform: selecting a point pair of a first point and a second point from a three-dimensional point cloud including points indicating a surface of a three-dimensional object; determining a first normal vector at the first point by using points included in a first area; determining a second normal vector at the first point by using points included in a second area; determining a third normal vector at the second point by using points included in a third area; determining a fourth normal vector at the second point by using points included in a fourth area; calculating a feature indicating a geometric feature by using the first normal vector, the second normal vector, the third normal vector, and the fourth normal vector; and performing a particular process by using the feature.

Abstract: A non-transitory computer readable storage medium storing computer readable instructions executable by a computer is provided. The computer readable instructions cause the computer to obtain first image data composing a first image and second image data composing a second image; specify first edge pixels in the first image and second edge pixels in the second image using the first image data and the second image data, respectively; specify a first feature point and a second feature point corresponding to each other using an algorithm different from an algorithm to specify the first edge pixels and the second pixels; determine pixels located in vicinity to the first feature point and pixels located in vicinity to the second feature point as first usable pixels and second usable pixels, respectively; and using the first usable pixels and the second usable pixels, determine positional relation between the first image and the second image.

Abstract: In an image forming apparatus, an image forming unit configured to form a toner image on a transfer medium includes four sets of a photoconductor drum and a development roller, respectively, for forming toner images of first, second, third and fourth colors, arranged in this order, in a direction opposite to a direction of movement of the transfer medium moving toward a detector configured to detect a toner image formed on the transfer medium. A controller executes a bias-corrective test image forming process in which a first bias-corrective test image of the first color is arranged in a position downstream of other three first bias-corrective test images, and a second bias-corrective test image of the first color is arranged in a position between two first bias-corrective test images selected among other three first bias-corrective test images, in the direction of movement of the transfer medium.

Abstract: In an image forming device, a controller converts continuous-tone image data to raster image data using a dither matrix. The continuous-tone image data includes pixels each has a tone value. The raster image data is binary image data corresponding to exposure areas. The dither matrix includes threshold values. The dither matrix is configured so that as an exposure area percentage of the raster image data increases, growth of the exposure area progresses according to a growth process including: a stage at which an exposure area extends in a predetermined screen direction from an isolated exposure area to connect with another isolated exposure area; and a stage at which after the isolated exposure area connects with another isolated exposure area, the exposure area extends in a crossing direction crossing the predetermined screen direction. The controller controls the exposure device to expose the photosensitive drum based on the raster image data.

Abstract: In an image forming apparatus, an image forming unit configured to form a toner image on a transfer medium includes four sets of a photoconductor drum and a development roller, respectively, for forming toner images of first, second, third and fourth colors, arranged in this order, in a direction opposite to a direction of movement of the transfer medium moving toward a detector configured to detect a toner image formed on the transfer medium. A controller executes a bias-corrective test image forming process in which a first bias-corrective test image of the first color is arranged in a position downstream of other three first bias-corrective test images, and a second bias-corrective test image of the first color is arranged in a position between two first bias-corrective test images selected among other three first bias-corrective test images, in the direction of movement of the transfer medium.

Abstract: A non-transitory computer readable storage medium storing computer readable instructions executable by a computer is provided. The computer readable instructions cause the computer to obtain subject image data composing a subject image, set larger regions and smaller regions in each of the larger regions in the subject image, calculate a first feature amount of each of the smaller regions with use of values of pixels in each of the smaller regions and a second feature amount of each of the larger regions with use of values of pixels in each of the larger regions, determine whether each of the smaller regions is an edge region including an edge based on a comparison between the first feature amount and the second feature amount, and generate edge image data indicating edges in the subject image with use of results of the determination whether each of the smaller regions is an edge region.

Abstract: A non-transitory computer readable storage medium storing computer readable instructions executable by a computer is provided. The computer readable instructions cause the computer to obtain first image data composing a first image and second image data composing a second image, specify first edge pixels in the first image using the first image and second edge pixels in the second image using the second image data, determine positional relation between the first image and the second image in a first degree of accuracy, based on positional relation between the first edge pixels and the second edge pixels, determine first usable pixels among the first edge pixels and the second usable pixels among the second edge pixels, and using the first usable pixels and the second usable pixels, determine positional relation between the first image and the second image in a second degree of accuracy being higher than the first degree.

Abstract: A non-transitory computer readable storage medium storing computer readable instructions executable by a computer is provided. The computer readable instructions cause the computer to obtain first image data composing a first image and second image data composing a second image; specify first edge pixels in the first image and second edge pixels in the second image using the first image data and the second image data, respectively; specify a first feature point and a second feature point corresponding to each other using an algorithm different from an algorithm to specify the first edge pixels and the second pixels; determine pixels located in vicinity to the first feature pint and pixels located in vicinity to the second feature point as first usable pixels and second usable pixels, respectively; and using the first usable pixels and the second usable pixels, determine positional relation between the first image and the second image.

Abstract: In an image forming apparatus, a processor acquires target image data representing a target image. The processor identifies as a first type pixel in the target image, and sets a target pixel from among peripheral pixels of the pixel identified as the first type pixel. The processor identifies the target pixel as a second type pixel in a case where the target pixel satisfies a specific condition. The processor generates processed image data by performing a replacement process in which a pixel value of the pixel identified as the first type pixel is replaced with a first value representing a first color and a pixel value of the pixel identified as the second type pixel is replaced with a second value representing a second color. The specific condition includes a condition that all specific pixels in a specific range match a specific pattern.

Abstract: In an image forming apparatus, a processor acquires target image data representing a target image. The processor identifies as a first type pixel in the target image, and sets a target pixel from among peripheral pixels of the pixel identified as the first type pixel. The processor identifies the target pixel as a second type pixel in a case where the target pixel satisfies a specific condition. The processor generates processed image data by performing a replacement process in which a pixel value of the pixel identified as the first type pixel is replaced with a first value representing a first color and a pixel value of the pixel identified as the second type pixel is replaced with a second value representing a second color. The specific condition includes a condition that all specific pixels in a specific range match a specific pattern.

Abstract: There is provided an image processing apparatus including a controller configured to: acquire scan data indicating a scan image including first and second specific color areas each indicating a part thereof printed by using a first nozzle and a third specific color area indicating a part thereof printed by using a second nozzle; and generate a plurality of parameters, by using the scan data, each of the plurality of parameters indicating jetting characteristic of a coloring material from one of the first and second nozzles corresponding thereto. The controller evaluates the difference between a color of the first specific color area and a color of the second specific color area, and the controller generates a parameter included in the plurality of parameters and corresponding to the second nozzle, by using a result of the evaluation of the difference and a value of a third pixel within the third specific color area.

Abstract: There is provided an image processing apparatus including a controller configured to execute: causing a printing execution unit to execute printing of a first test image and a second test image; acquiring first scan image data; acquiring second scan image data; identifying a first boundary; identifying a first number of pixels and a second number of pixels; calculating a first number of unit pixels and a second number of unit pixels; calculating a relevant value related to density of a dot formed by each nozzle; and generating characteristics data which indicates ink jetting characteristics of N pieces of nozzle.

Abstract: There is provided an image processing apparatus including a controller configured to execute: causing a printing execution unit to execute printing of a first test image and a second test image; acquiring first scan image data; acquiring second scan image data; identifying a first boundary; identifying a first number of pixels and a second number of pixels; calculating a first number of unit pixels and a second number of unit pixels; calculating a relevant value related to density of a dot formed by each nozzle; and generating characteristics data which indicates ink jetting characteristics of N pieces of nozzle.

Abstract: There is provided an image processing apparatus including a controller configured to: acquire scan data indicating a scan image including first and second specific color areas each indicating a part thereof printed by using a first nozzle and a third specific color area indicating a part thereof printed by using a second nozzle; and generate a plurality of parameters, by using the scan data, each of the plurality of parameters indicating jetting characteristic of a coloring material from one of the first and second nozzles corresponding thereto. The controller evaluates the difference between a color of the first specific color area and a color of the second specific color area, and the controller generates a parameter included in the plurality of parameters and corresponding to the second nozzle, by using a result of the evaluation of the difference and a value of a third pixel within the third specific color area.