https://studio.mangoeffect.net/en/tags/node-guide/Recent content in Node-Guide on task_graph · GraphStudio — C++20 DAG Task Execution Frameworkhttps://studio.mangoeffect.net/img/og-image-wide.pnghttps://studio.mangoeffect.net/img/og-image-wide.pngHugoen-USMon, 21 Sep 2026 22:05:21 +0800https://studio.mangoeffect.net/en/blog/blend/Tue, 14 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/blend/Two-input compositing with all 27 Photoshop blend modes: GPU-first with a mirrored CPU fallback.https://studio.mangoeffect.net/en/blog/face_detect/Tue, 14 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/face_detect/Face box detection with optional 478-point landmarks; MediaPipe/MNN backends with auto fallback.https://studio.mangoeffect.net/en/blog/matting/Tue, 14 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/matting/Portrait alpha estimation with three outputs (result / gray mask / transparent cutout); MediaPipe/MNN backends.https://studio.mangoeffect.net/en/blog/gpu_alpha_composite/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_alpha_composite/GPU alpha compositing (over): foreground in over background in2.https://studio.mangoeffect.net/en/blog/gpu_blend/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_blend/Linear blend of two inputs on the GPU (opacity interpolation).https://studio.mangoeffect.net/en/blog/gpu_box_blur/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_box_blur/Box mean blur on the GPU compute pipeline, semantics aligned with opencv_blur_filter.https://studio.mangoeffect.net/en/blog/gpu_brightness_contrast/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_brightness_contrast/Linear brightness/contrast adjustment on the GPU.https://studio.mangoeffect.net/en/blog/gpu_crop/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_crop/Rectangular crop on the GPU (x/y/width/height).https://studio.mangoeffect.net/en/blog/gpu_flip/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_flip/Image flip on the GPU (horizontal/vertical/both).https://studio.mangoeffect.net/en/blog/gpu_gamma/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_gamma/Power-law gamma correction on the GPU.https://studio.mangoeffect.net/en/blog/gpu_gaussian_blur/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_gaussian_blur/Gaussian blur as a GPU compute op (WGSL/MSL/GLSL single-source kernels).https://studio.mangoeffect.net/en/blog/gpu_grayscale/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_grayscale/GPU RGB→gray using the BGR2GRAY fixed-point coefficients; no parameters.https://studio.mangoeffect.net/en/blog/gpu_invert/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_invert/GPU pixel inversion; no parameters.https://studio.mangoeffect.net/en/blog/gpu_laplacian/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_laplacian/GPU second-derivative Laplacian; no parameters.https://studio.mangoeffect.net/en/blog/gpu_resize/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_resize/Bilinear resize on the GPU.https://studio.mangoeffect.net/en/blog/gpu_rgb2hsv/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_rgb2hsv/RGB→HSV conversion on the GPU; no parameters.https://studio.mangoeffect.net/en/blog/gpu_rotate90/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_rotate90/Multiple-of-90° rotation on the GPU.https://studio.mangoeffect.net/en/blog/gpu_sharpen/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_sharpen/Unsharp-mask sharpening on the GPU.https://studio.mangoeffect.net/en/blog/gpu_sobel/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_sobel/GPU Sobel gradient (magnitude output).https://studio.mangoeffect.net/en/blog/gpu_threshold/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/gpu_threshold/Fixed-threshold binarization on the GPU.https://studio.mangoeffect.net/en/blog/render_box_dir/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_box_dir/Parameterized directional box blur (horizontal/vertical pass).https://studio.mangoeffect.net/en/blog/render_dilate_dir/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_dilate_dir/GPU separable morphological dilation (max); iterations repeat passes.https://studio.mangoeffect.net/en/blog/render_erode_dir/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_erode_dir/GPU separable morphological erosion (min).https://studio.mangoeffect.net/en/blog/render_gauss_dir/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_gauss_dir/Parameterized directional Gaussian: ksize ≤ 99, sigma = 0 auto-derives per the OpenCV formula.https://studio.mangoeffect.net/en/blog/render_gauss_h/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_gauss_h/Built-in 5-tap [1,4,6,4,1]/16 separable Gaussian, horizontal pass.https://studio.mangoeffect.net/en/blog/render_gauss_v/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_gauss_v/Built-in 5-tap [1,4,6,4,1]/16 separable Gaussian, vertical pass.https://studio.mangoeffect.net/en/blog/render_gradient/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_gradient/Generates a linear gradient with no input: tests, backgrounds, compositing plates.https://studio.mangoeffect.net/en/blog/render_laplacian/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_laplacian/Render-path Laplacian (ksize 1-7).https://studio.mangoeffect.net/en/blog/render_lut/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_lut/Two-input LUT apply: in = image, in2 = LUT image; HALD and stripe layouts auto-detected.https://studio.mangoeffect.net/en/blog/render_lut_cube/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_lut_cube/Reads a .cube 3D LUT and converts it on the CPU into a HALD LUT image (feeds render_lut’s in2).https://studio.mangoeffect.net/en/blog/render_mix/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_mix/Two-input GPU mix (factor interpolation) on the render path.https://studio.mangoeffect.net/en/blog/render_pass/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_pass/The single-pass offscreen building block: one script, one fullscreen-triangle draw.https://studio.mangoeffect.net/en/blog/render_passthrough/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_passthrough/Identity render: in comes out unchanged — the control node for the GPU upload/download path.https://studio.mangoeffect.net/en/blog/render_pipeline/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_pipeline/Task-level pass orchestration: a passes count plus flat pass{i}_* parameter keys express the whole filter chain.https://studio.mangoeffect.net/en/blog/render_scharr/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_scharr/Render-path Scharr derivative (smoothing kernel calibrated as [3,10,3]).https://studio.mangoeffect.net/en/blog/render_sobel/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_sobel/Render-path Sobel (ksize 1-7); kernel coefficients computed on the CPU and sent as uniforms.https://studio.mangoeffect.net/en/blog/render_subtract/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_subtract/Saturating in - in2: the building block for morphological gradients and diff mattes.https://studio.mangoeffect.net/en/blog/render_threshold/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_threshold/Luminance threshold binarization on the GPU render path.https://studio.mangoeffect.net/en/blog/render_unsharp/Mon, 13 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/render_unsharp/Unsharp mask: in = original, in2 = blurred; amount controls strength.https://studio.mangoeffect.net/en/blog/opencv_add_weighted/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_add_weighted/Linear blend of two inputs by alpha/beta/gamma — stacking, crossfades, watermarks.https://studio.mangoeffect.net/en/blog/opencv_brightness_contrast/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_brightness_contrast/Linear gain/bias adjustment of brightness and contrast.https://studio.mangoeffect.net/en/blog/opencv_clahe/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_clahe/Contrast-limited adaptive histogram equalization: local enhancement with controllable noise amplification.https://studio.mangoeffect.net/en/blog/opencv_connected_components/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_connected_components/Labels each connected region of a binary image with an integer id.https://studio.mangoeffect.net/en/blog/opencv_denoise/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_denoise/fastNlMeansDenoising: patch-similarity denoise with the best detail retention.https://studio.mangoeffect.net/en/blog/opencv_distance_transform/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_distance_transform/Distance field of foreground pixels to the nearest background — the intermediate for skeletons and width.https://studio.mangoeffect.net/en/blog/opencv_equalize_hist/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_equalize_hist/Global histogram equalization: stretches dynamic range.https://studio.mangoeffect.net/en/blog/opencv_flood_fill/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_flood_fill/Floods from a seed point by similarity — selections and magic-wand behavior.https://studio.mangoeffect.net/en/blog/opencv_gamma_correct/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_gamma_correct/Power-law adjustment (out = in^gamma) — display matching and lifting shadows.https://studio.mangoeffect.net/en/blog/opencv_grabcut/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_grabcut/Iterated graph-cut segmentation initialized by a rectangle or mask — the classic interactive cutout.https://studio.mangoeffect.net/en/blog/opencv_invert/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_invert/Pixel inversion (255 - x): negatives and mask inversion.https://studio.mangoeffect.net/en/blog/opencv_sharpen/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_sharpen/Classic unsharp-mask sharpening wrapped in one node.https://studio.mangoeffect.net/en/blog/opencv_watershed/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_watershed/Classic watershed with a marker image to split touching objects.https://studio.mangoeffect.net/en/blog/video_reader/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/video_reader/Reads video files frame by frame (mp4 / mov / avi …); each execution yields one frame.https://studio.mangoeffect.net/en/blog/video_writer/Sun, 12 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/video_writer/Encodes an incoming frame sequence into a video file (fourcc / fps / color configurable).https://studio.mangoeffect.net/en/blog/color_grade_bcs/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/color_grade_bcs/Brightness, contrast and saturation in a single node.https://studio.mangoeffect.net/en/blog/color_grade_curves/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/color_grade_curves/Master and per-channel curves described as control-point strings.https://studio.mangoeffect.net/en/blog/color_grade_hsl/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/color_grade_hsl/Per-hue-range (red/yellow/green/cyan/blue/magenta) hue/sat/lum adjustments plus master controls.https://studio.mangoeffect.net/en/blog/color_grade_lut/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/color_grade_lut/Applies a .cube 3D LUT (trilinear or tetrahedral interpolation).https://studio.mangoeffect.net/en/blog/color_grade_mixer/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/color_grade_mixer/Recombines RGB output channels from weighted input channels — channel swaps and tonal splits.https://studio.mangoeffect.net/en/blog/color_grade_wheels/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/color_grade_wheels/Lift / Gamma / Gain wheels: RGB offset plus master brightness per tonal range.https://studio.mangoeffect.net/en/blog/opencv_adaptive_threshold/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_adaptive_threshold/Binarizes by local neighborhood statistics (mean/Gaussian) — robust to uneven lighting.https://studio.mangoeffect.net/en/blog/opencv_apply_color_map/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_apply_color_map/Maps single-channel input through a preset palette (JET / VIRIDIS / BONE …) — heatmaps in one step.https://studio.mangoeffect.net/en/blog/opencv_cvt_color/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_cvt_color/Common conversions among BGR/GRAY/RGB/HSV/HLS/LAB/LUV/YCrCb/XYZ.https://studio.mangoeffect.net/en/blog/opencv_flip/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_flip/Horizontal / vertical / both-axes flip (flip code 0 / 1 / -1).https://studio.mangoeffect.net/en/blog/opencv_resize/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_resize/Resize by target width/height and interpolation method.https://studio.mangoeffect.net/en/blog/opencv_rotate/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_rotate/Fast 90°/180°/270° rotation (rotate code 0/1/2).https://studio.mangoeffect.net/en/blog/opencv_threshold/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_threshold/Global threshold with binary/inverted/trunc/tozero semantics, plus OTSU and TRIANGLE auto modes.https://studio.mangoeffect.net/en/blog/opencv_transpose/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_transpose/Swaps rows and columns (mirror across the main diagonal).https://studio.mangoeffect.net/en/blog/opencv_warp_affine/Sat, 11 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_warp_affine/Translate/rotate/scale/shear by a 2×3 affine matrix; arbitrary-angle rotation lives here.https://studio.mangoeffect.net/en/blog/io_input/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/io_input/Graph boundary for embedded execution: the host binds a value into io_input before running; downstream tasks consume its out port.https://studio.mangoeffect.net/en/blog/io_output/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/io_output/Graph boundary for embedded execution: the host collects the graph result from io_output after the run.https://studio.mangoeffect.net/en/blog/opencv_bilateral_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_bilateral_filter/Edge-preserving denoise: weights by spatial distance and color difference together.https://studio.mangoeffect.net/en/blog/opencv_blur_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_blur_filter/Box-style mean blur: averages the kernel window — the fastest way to smooth.https://studio.mangoeffect.net/en/blog/opencv_box_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_box_filter/Box filter: sums the kernel window (optionally normalized) — the generic form of the mean blur.https://studio.mangoeffect.net/en/blog/opencv_dilate/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_dilate/Morphological dilation: max over the window — bright regions grow, gaps close.https://studio.mangoeffect.net/en/blog/opencv_erode/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_erode/Morphological erosion: min over the window — bright regions shrink, white specks vanish.https://studio.mangoeffect.net/en/blog/opencv_filter_2d/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_filter_2d/2D convolution with any kernel you write down as a numeric matrix.https://studio.mangoeffect.net/en/blog/opencv_gabor_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_gabor_filter/Directional texture filtering with Gabor kernels — a classic for fingerprint/fabric analysis.https://studio.mangoeffect.net/en/blog/opencv_gaussian_blur_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_gaussian_blur_filter/Gaussian-weighted blur: natural smoothing, the default choice for denoising.https://studio.mangoeffect.net/en/blog/opencv_image_read/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_image_read/Reads one image from disk (png / jpg / bmp / tiff / webp …) as the graph’s input source.https://studio.mangoeffect.net/en/blog/opencv_image_write/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_image_write/Writes the upstream image to a file; the format is inferred from the extension.https://studio.mangoeffect.net/en/blog/opencv_laplacian_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_laplacian_filter/Second-derivative operator: isotropic edge/texture response, used for sharpening and edge detection.https://studio.mangoeffect.net/en/blog/opencv_median_blur_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_median_blur_filter/Median filter: takes the median in the window — extremely effective on salt-and-pepper noise, edge-preserving.https://studio.mangoeffect.net/en/blog/opencv_morphology_ex/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_morphology_ex/Open/close/gradient/top-hat/black-hat: the composed morphology operations in one node.https://studio.mangoeffect.net/en/blog/opencv_pyr_down/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_pyr_down/Gaussian blur + halved size: anti-aliased downsampling.https://studio.mangoeffect.net/en/blog/opencv_pyr_up/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_pyr_up/Upscale ×2 then blur: the pyramid inverse.https://studio.mangoeffect.net/en/blog/opencv_scharr_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_scharr_filter/Scharr operator: more rotationally accurate than Sobel at the 3× kernel size.https://studio.mangoeffect.net/en/blog/opencv_sep_filter_2d/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_sep_filter_2d/Two 1D kernels applied in sequence (horizontal then vertical) — the fast filter2d for big kernels.https://studio.mangoeffect.net/en/blog/opencv_sobel_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_sobel_filter/Sobel gradient with selectable dx/dy orders — the basic edge-detection building block.https://studio.mangoeffect.net/en/blog/opencv_sqr_box_filter/Fri, 10 Jul 2026 10:00:00 +0800https://studio.mangoeffect.net/en/blog/opencv_sqr_box_filter/Averaged squared pixel values over the window — a building block for local energy/variance.